CN118555009A - Optical amplification device, optical communication apparatus, and optical amplification method - Google Patents

Optical amplification device, optical communication apparatus, and optical amplification method Download PDF

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Publication number
CN118555009A
CN118555009A CN202310216421.7A CN202310216421A CN118555009A CN 118555009 A CN118555009 A CN 118555009A CN 202310216421 A CN202310216421 A CN 202310216421A CN 118555009 A CN118555009 A CN 118555009A
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China
Prior art keywords
optical
power
soa
ofa
optical signal
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CN202310216421.7A
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Chinese (zh)
Inventor
王元武
王伟
张奎
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN202310216421.7A priority Critical patent/CN118555009A/en
Priority to PCT/CN2024/073812 priority patent/WO2024179230A1/en
Publication of CN118555009A publication Critical patent/CN118555009A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/2912—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing
    • H04B10/2914—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing using lumped semiconductor optical amplifiers [SOA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/2912—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/293—Signal power control
    • H04B10/294—Signal power control in a multiwavelength system, e.g. gain equalisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/293—Signal power control
    • H04B10/294—Signal power control in a multiwavelength system, e.g. gain equalisation
    • H04B10/2941—Signal power control in a multiwavelength system, e.g. gain equalisation using an equalising unit, e.g. a filter

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Lasers (AREA)

Abstract

The application provides an optical amplifying device which is applied to the field of optical communication. The optical amplifying device includes a first semiconductor optical amplifier SOA, a first optical fiber amplifier OFA, a first power detector PD, and a processor. The first PD is used for acquiring first power of the optical signal and transmitting the first power to the processor. The processor is configured to obtain a first threshold value and transmit a first electrical signal to the first SOA based on the first power. The current or voltage of the first electrical signal is less than or equal to a first threshold. The first SOA is configured to amplify the optical signal according to the first electrical signal and transmit the optical signal to the first OFA. The first OFA is used for amplifying the optical signal and outputting the optical signal. In the application, the nonlinear cost can be reduced by limiting the output power of the SOA. And by adding OFA to carry out secondary amplification, the whole gain performance can be ensured.

Description

Optical amplification device, optical communication apparatus, and optical amplification method
Technical Field
The present application relates to the field of optical communications, and in particular, to an optical amplifying device, an optical communication apparatus, and an optical amplifying method.
Background
In the field of optical communication, in order to realize long-distance transmission of an optical signal, an optical amplifier is required to be provided on an optical transmission path for power amplification of the optical signal. For example, semiconductor optical amplifiers (semiconductor optical amplifier, SOAs) are relatively low cost, while amplifying optical signals over a relatively wide spectral range. The SOA performs the following steps for power amplifying the optical signal. The input power and output power of the SOA are obtained by a Power Detector (PD). The actual gain is obtained by the difference between the input power and the output power. A deviation of the actual gain from the target gain is determined. And adjusting the control electric signal of the SOA according to the deviation so that the deviation is smaller than the threshold value.
However, in practical applications, SOAs introduce significant non-linearity penalty at high power outputs, resulting in poor performance.
Disclosure of Invention
The application provides an optical amplifying device, optical communication equipment and an optical amplifying method, which can reduce nonlinear cost by limiting the output power of an SOA. And by adding OFA to carry out secondary amplification, the whole gain performance can be ensured.
The first aspect of the present application provides an optical amplifying device. The optical amplifying device includes a first SOA, a first fiber amplifier (optical fiber amplifier, OFA), a first Power Detector (PD), and a processor. The first PD is used for acquiring first power of the optical signal and transmitting the first power to the processor. The processor is configured to obtain a first threshold value and transmit a first electrical signal to the first SOA based on the first power. The current or voltage of the first electrical signal is less than or equal to a first threshold. The first SOA is configured to amplify the optical signal according to the first electrical signal and transmit the optical signal to the first OFA. The first OFA is used for amplifying the optical signal and outputting the optical signal.
In the present application, when the first electrical signal is equal to the first threshold value, the power of the optical signal output by the first SOA is equal to the target power. By defining the first electrical signal to be less than or equal to the first threshold value, it is defined that the output power of the first SOA is less than or equal to the target power. When the output power of the first SOA is less than or equal to the target power, the nonlinear penalty introduced by the first SOA is small. When the output power of the first SOA is greater than the target power, the nonlinear penalty introduced by the first SOA increases significantly. Thus, by limiting the output power of the first SOA, the non-linear penalty introduced by the first SOA can be reduced.
In an alternative form of the first aspect, the optical amplifying device further comprises a second PD. The second PD is used for acquiring second power of the optical signal output by the first OFA and transmitting the second power to the processor. The processor is further configured to adjust a gain of the first SOA and/or the first OFA based on the first power and the second power. The difference between the second power and the first power is the actual overall gain of the optical amplifying device. The processor may also obtain an overall gain target, and adjust the gain of the first SOA and/or the first OFA based on the overall gain target and the actual overall gain. Therefore, the application can control the actual overall gain of the optical amplifying device through feedback adjustment, thereby improving the reliability of optical communication.
In an alternative form of the first aspect, the processor is configured to adjust the gain of the first OFA based on the first power and the second power. In the optical amplifying device, when the processor adjusts the gain of the first SOA, the power of the optical signal input to the first OFA is affected, thereby affecting the flatness of the optical signal. Therefore, the operation of adjusting the overall gain of the optical amplifying device by adjusting the gain of the first OFA is complicated. In the application, the overall gain of the optical amplifying device is adjusted by adjusting the gain of the first OFA, so that the efficiency of adjusting the overall gain can be improved.
In an alternative form of the first aspect, the optical amplifying device further includes a tunable optical attenuator (variable optical attenuator, VOA), a third PD, and a fourth PD. The VOA is located between the first SOA and the first OFA. The third PD is located between the first SOA and the VOA. The fourth PD is located between the first OFA and the VOA. The third PD is used for acquiring third power of the optical signal. The fourth PD is configured to obtain a fourth power of the optical signal. The processor is configured to adjust the attenuation value of the VOA based on the third power and the fourth power. When the power of the optical signal input to the first SOA changes, the flatness of the optical signal output from the first SOA changes. By adjusting the attenuation value of the VOA, the power of the optical signal input to the first OFA can be changed, thereby changing the degree of influence of the first OFA on the flatness. The effect of the first OFA on the flatness can be used to compensate for the flatness variations due to the first SOA. Therefore, by adjusting the attenuation value of the VOA, the power balance of the optical signal at different wavelengths can be improved, thereby improving the reliability of optical communication.
In an alternative form of the first aspect, the optical amplifying device further comprises a second OFA. The second OFA is located between the first SOA and the first OFA. Wherein when the same gain target is achieved by two OFAs and one OFA, respectively, the two OFAs need to consume lower power. Therefore, in the present application, by adding the second OFA, the power consumption of the optical amplifying device can be reduced.
In an alternative form of the first aspect, the optical amplifying device further comprises a first gain flattening filter (GAIN FLATTENING FILTER, GFF). The first GFF is located between the first SOA and the first OFA. The first GFF is used to improve the flatness of an optical signal by filtering. Therefore, the application can improve the power balance of the optical signals at different wavelengths, thereby improving the reliability of optical communication.
In an alternative form of the first aspect, the optical amplifying device further comprises a second GFF. The second GFF is located between the first SOA and the second OFA. The first GFF is located between the second OFA and the first OFA. In the optical amplifying device, the larger the insertion loss of the rear end is, the larger the power consumption of the optical amplifying device is. Therefore, when the optical amplification device performs power flattening only by the first GFF, the power consumption of the optical amplification device is large. In the present application, by adding the second GFF, the power consumption of the optical amplifying device can be reduced.
In an alternative form of the first aspect, the optical amplifying device further comprises a second SOA. The second SOA is located between the first SOA and the first OFA. Wherein, when the same gain target is achieved by two SOAs and one SOA, respectively, the two SOAs need to consume lower power consumption. In the application, by adding the second SOA, the power consumption of the optical amplifying device can be reduced.
In an alternative form of the first aspect, the processor is further configured to obtain a second threshold value, and transmit a second electrical signal to the second SOA according to the first power. The current or voltage of the second electrical signal is less than a second threshold. The second SOA is configured to power amplify the optical signal according to the second electrical signal. Wherein the second SOA introduces a significant non-linear penalty at high power outputs. By limiting the output power of the second SOA, the non-linearity penalty can be reduced.
In an alternative form of the first aspect, the second threshold is greater than the first threshold. When the second threshold is equal to the first threshold, the power flatness of the optical signal may be improved by placing a GFF between the first and second SOAs. In the present application, by defining the second threshold to be greater than the first threshold, the overall upper gain limits of the two SOAs can be increased.
In an alternative form of the first aspect, the wavelength of the optical signal is in the L-band.
A second aspect of the present application provides an optical communication apparatus. The optical communication device comprises an optical transmission module and an optical amplifying device as described in the first aspect or any of the alternatives of the first aspect. The optical transmitting module is used for modulating the carrier beam according to the electric signal to obtain an optical signal. The optical amplifying device is used for amplifying the optical signal.
A third aspect of the application provides a method of optical amplification. The optical amplification method comprises the following steps: the optical amplifying device obtains a first power of the optical signal. The light amplifying device acquires a first threshold value. The optical amplifying device generates a first electrical signal according to the first power. The current or voltage of the first electrical signal is less than or equal to a first threshold. The optical amplifying device amplifies the optical signal through the first electrical signal and the first SOA, i.e. the optical amplifying device amplifies the optical signal according to the first electrical signal through the first SOA. The optical amplifying device amplifies the optical signal again through the first OFA and outputs the optical signal.
In an alternative form of the third aspect, the optical amplifying method further includes the steps of: the optical amplifying device acquires a second power of the optical signal output by the first OFA. The optical amplifying device adjusts the amplifying gain of the first SOA and/or the first OFA according to the first power and the second power.
In an alternative form of the third aspect, the adjusting, by the optical amplifying device, the amplification gain of the first SOA and/or the first OFA according to the first power and the second power includes: the optical amplifying device adjusts an amplifying gain of the first OFA according to the first power and the second power.
In an alternative form of the third aspect, the optical amplifying method further includes the steps of: the optical amplifying device acquires a third power of an optical signal input to the VOA and a fourth power of an optical signal output from the VOA. The optical amplifying means adjusts the attenuation value of the VOA according to the third power and the fourth power.
In an alternative form of the third aspect, the optical amplifying method further includes the steps of: the optical amplifying device amplifies the optical signal output by the first SOA again through the second OFA.
In an alternative form of the third aspect, the optical amplifying method further includes the steps of: the optical amplifying device acquires a second threshold value. The optical amplification device generates a second electrical signal based on the first power. The current or voltage of the second electrical signal is less than or equal to a second threshold. The optical amplifying device amplifies the optical signal output by the first SOA again through the second electrical signal and the second SOA.
In an alternative form of the third aspect, the second threshold is greater than the first threshold.
In an alternative form of the third aspect, the optical amplifying method further includes the steps of: the optical amplification device filters the optical signal through the first GFF. The first GFF is used to improve the flatness of an optical signal by filtering.
Drawings
Fig. 1 is a schematic diagram of a first structure of an optical amplifying device according to an embodiment of the present application;
Fig. 2 is a schematic diagram of a second structure of an optical amplifying device according to an embodiment of the present application;
fig. 3 is a schematic diagram of a third structure of an optical amplifying device according to an embodiment of the present application;
Fig. 4 is a schematic diagram of a fourth structure of an optical amplifying device according to an embodiment of the present application;
Fig. 5 is a schematic diagram of a fifth structure of an optical amplifying device according to an embodiment of the present application;
Fig. 6 is a schematic diagram of a sixth structure of an optical amplifying device according to an embodiment of the present application;
fig. 7 is a schematic diagram of a seventh structure of an optical amplifying device according to an embodiment of the present application;
Fig. 8 is a schematic diagram of an eighth structure of an optical amplifying device according to an embodiment of the present application;
fig. 9 is a ninth schematic structural view of an optical amplifying device according to an embodiment of the present application;
fig. 10 is a schematic structural diagram of an optical communication device according to an embodiment of the present application;
fig. 11 is a schematic structural diagram of an optical communication system according to an embodiment of the present application;
fig. 12 is a flow chart of an optical amplifying method according to an embodiment of the present application.
Detailed Description
The application provides an optical amplifying device, optical communication equipment and an optical amplifying method, which can reduce nonlinear cost by limiting the output power of an SOA. And by adding OFA to carry out secondary amplification, the whole gain performance can be ensured. It is to be understood that the terms "first," "second," "target," and the like, as used herein, are used solely for the purpose of distinguishing between descriptions and not necessarily for indicating or implying a relative importance or order. In addition, for simplicity and clarity, reference numbers and/or letters are repeated throughout the several figures of the application. Repetition does not indicate a tightly defined relationship between the various embodiments and/or configurations.
The optical amplifying device is applied to the field of optical communication. In the field of optical communication, in order to realize long-distance transmission of an optical signal, an optical amplifier needs to be provided on an optical transmission path. The optical amplifier is used for amplifying the power of the optical signal. For example, semiconductor optical amplifiers (semiconductor optical amplifier, SOAs) are relatively low cost, while amplifying optical signals over a relatively wide spectral range. However, in practical applications, SOAs introduce significant non-linearity penalty at high power outputs, resulting in poor performance.
To this end, the application provides an optical amplifying device. Fig. 1 is a schematic diagram of a first structure of an optical amplifying device according to an embodiment of the present application. As shown in fig. 1, the optical amplifying apparatus 100 includes a first Power Detector (PD) 101, a first SOA 102, a first fiber amplifier (optical fiber amplifier, OFA) 103, and a processor 104. The respective devices in the optical amplifying apparatus 100 are described below separately.
The first PD 101 is configured to obtain a first power of an optical signal. Specifically, the light amplifying device 100 further includes a light beam splitter. The optical beam splitter is used for receiving the optical signal and splitting the optical signal to obtain two sub-beams of the optical signal. The optical splitter is also used to transmit sub-beams of optical signals to the first PD 101 and the first SOA 102, respectively. The first PD 101 is configured to measure a first power of the sub-beam and transmit the first power to the processor 104.
The processor 104 may be a micro control unit (microcontroller unit, MCU), a programmable logic device (programmable logic device, PLD), a complex programmable logic device (complex programmable logic device, CPLD), an application-specific integrated circuit (ASIC), a central processor (central processing unit, CPU), or a network processor (network processor, NP), or the like.
The processor 104 is configured to obtain a first threshold value, and obtain a first electrical signal according to the first power and the first threshold value. The current or voltage of the first electrical signal is less than or equal to a first threshold. For example, the processor 104 is configured to obtain the power of the optical signal input to the optical amplifying device 100 or the power of the optical signal input to the first SOA 102 according to the splitting ratio of the optical splitter and the first power. The processor 104 is further configured to obtain an overall gain target for the optical amplifying device 100, and obtain a first gain target for the first SOA 102 and a second gain target for the first OFA 103 according to the overall gain target. The processor 104 is configured to obtain a driving signal required by the first SOA 102 according to the first gain target. The drive signal of the first SOA 102 is also referred to as a first electrical signal. The processor 104 is further configured to obtain a first mapping relationship. The first mapping relationship includes a correspondence relationship between power of the plurality of optical signals and a plurality of thresholds. The first mapping relationship may be obtained by calibrating the first SOA 102 before the first SOA 102 leaves the factory. The processor 104 is configured to obtain a first threshold according to a first power of the optical signal and a first mapping relationship. If the current or voltage of the first electrical signal is less than or equal to the first threshold, the processor 104 is configured to transmit the first electrical signal to the first SOA 102. If the current or voltage of the first electrical signal is greater than the first threshold, the processor 104 is configured to modify the first gain target such that the voltage or current of the first electrical signal is less than or equal to the first threshold. After modifying the first gain target, the processor 104 is configured to transmit a first electrical signal to the first SOA 102.
The first SOA 102 is configured to receive a first electrical signal from the processor 104. The first electrical signal acts as a drive signal for the first SOA 102. The first SOA 102 is configured to power amplify the optical signal according to the first electrical signal, and transmit the power amplified optical signal to the first OFA 103. The processor 104 is configured to generate a driving signal of the first OFA 103 according to the second gain target. It should be appreciated that after modifying the first gain target, the processor 104 may also be configured to modify the second gain target in order to leave the overall gain target unchanged. At this time, the processor 104 is configured to generate a driving signal of the first OFA 103 according to the modified second gain target. The first OFA 103 may be an erbium doped fiber amplifier (erbium doped fiber amplifier, EDFA), a bismuth doped fiber amplifier (bismuth doped fiber amplifier, BIDFA), or an ytterbium doped fiber amplifier (ytterbium doped fiber amplifier, YDFA), or the like. The first OFA 103 is configured to receive a driving signal from the processor 104, and power-amplify the optical signal according to the driving signal.
In an embodiment of the present application, when the first electrical signal is equal to the first threshold, the power of the optical signal output by the first SOA 102 is equal to the target power. By defining the first electrical signal to be less than or equal to the first threshold, it is defined that the output power of the first SOA 102 is less than or equal to the target power. By limiting the output power of the first SOA 102, the non-linear penalty introduced by the first SOA 102 may be reduced. Further, by adding the second OFA 103 to perform the second-stage amplification, the overall gain performance can be ensured.
In practical applications, the optical amplifying device 100 may further include a detection PD. The detection PD is used to measure the power of the optical signal output by the first SOA 102 and transmit the power of the optical signal to the processor 104. The processor 104 is configured to determine whether the power of the optical signal is less than or equal to a target power. If the power of the optical signal is greater than the target power, the processor 104 may modify the first gain target and/or the first mapping.
As can be seen from the description of fig. 1, the processor 104 is configured to obtain a driving signal (first electrical signal) required by the first SOA 102 according to the first gain target. When the first SOA 102 power amplifies the optical signal from the first electrical signal, the actual gain of the first SOA 102 may not be equal to the first gain target. Similarly, the actual gain of the first OFA 103 may not be equal to the second gain target. Thus, the effective overall gain of the optical amplification apparatus 100 may not be equal to the overall gain target. The optical amplification device 100 may control the deviation of the effective overall gain from the overall gain target through feedback adjustment. This is described below.
Fig. 2 is a schematic diagram of a second structure of the optical amplifying device according to an embodiment of the present application. As shown in fig. 2, the optical amplifying device 100 further includes a second PD 201 on the basis of fig. 1. The second PD 201 is configured to acquire a second power of the optical signal output by the first OFA 103. It should be understood that in fig. 2 and the following examples, a description of the PD acquiring power through the optical beam splitter is omitted. And, the power of the sub-beam and the power of the optical signal measured by the PD can be obtained by the splitting ratio of the optical beam splitter. Therefore, for convenience of description, the power of the sub-beam measured by the PD is referred to as the power of the optical signal. The second PD 201 is also configured to transmit a second power to the processor 104. The processor 104 is configured to adjust the gain of the first SOA102 and/or the first OFA 103 based on the first power and the second power. The difference between the first power and the second power is the actual overall gain of the optical amplifying device. The actual overall gain is divided into an effective overall gain and a noise overall gain. The processor 104 may also be used to obtain an overall gain target. The processor 104 is also configured to adjust the gain of the first SOA102 and/or the first OFA 103 when the deviation of the overall gain target from the effective overall gain is excessive. It should be appreciated that the processor 104 may be configured to adjust the gain of the first SOA102 and/or the first OFA 103 multiple times based on the feedback of the second PD 201 until the deviation of the overall gain target from the effective overall gain is less than the target value.
In practical applications, when the processor 104 is configured to adjust the gain of the first SOA 102 through feedback from the second PD 201, the power of the optical signal input to the first OFA 103 is affected, thereby affecting the flatness of the optical signal. Therefore, the operation of adjusting the overall gain of the optical amplifying device 100 by adjusting the gain of the first OFA 103 is complicated. Thus, in an embodiment of the present application, the processor 104 may be configured to adjust the gain of the first OFA 103 based on the first power and the second power. When the gain of the first OFA 103 cannot be adjusted any more (e.g., to the upper gain limit of the first OFA 103), the processor 104 is again configured to adjust the gain of the first SOA 102 based on the first power and the second power.
As can be seen from the foregoing description of fig. 2, the processor 104 can be configured to adjust the gain of the first SOA 102 and/or the first OFA 103 based on the overall gain target and the effective overall gain. In practical applications, the processor 104 may also be configured to adjust the gain of the first SOA 102 and/or the first OFA 103 according to the target output power and the actual output power of the optical amplifying device 100. The actual output power is the second power. The processor 104 is configured to obtain the actual output power by the second PD 201. The processor 104 may also be configured to derive the target output power of the optical amplifying device 100 according to the following equation.
Pout_target＝Pin+G+Pase
Wherein pout_target is the target output power. Pin is the input optical power of the optical amplifying device 100. G is the overall gain target. Pase is the power of the spontaneous emission (AMPLIFIED SPONTANEOUS EMISSION, ASE) of the overall amplifier, i.e. the noise overall gain. The unit of each parameter in the formula is decibel (dB). The processor 104 is configured to calculate a power offset based on the output power target and the actual output power.
Perr＝Pout-Pout_target
Wherein Perr is the power offset. Pout is the actual output power. When the power deviation is greater than the target value, the processor 104 is configured to adjust the gain of the first SOA 102 and/or the first OFA 103, i.e. adjust the value of G, such that the power deviation is less than the target value.
As can be seen from the foregoing description of fig. 1, the first SOA 102 is configured to power amplify an optical signal according to a first electrical signal. During power amplification, the first SOA 102 may have an effect on the flatness of the optical signal. Flatness of an optical signal refers to the power tilt of optical signals of different wavelengths in the optical signal. To reduce the effect of the first SOA 102 on the flatness of the optical signal, the optical amplification device 100 may filter the optical signal through a gain flattening filter (GAIN FLATTENING DILTER, GFF). Fig. 3 is a schematic diagram of a third structure of an optical amplifying device according to an embodiment of the present application. As shown in fig. 3, the optical amplification device 100 further includes a first GFF 301 in addition to fig. 2. The first GFF 301 is located between the first SOA 102 and the first OFA 103. The first GFF 301 is configured to receive the optical signal from the first SOA 102 and filter the optical signal. In the embodiment of the present application, the first GFF 301 filters the optical signal, so that the influence of the first SOA 102 on the flatness of the optical signal can be reduced.
In practical applications, when the power of the optical signal input to the first SOA 102 changes, the flatness of the optical signal output by the first SOA 102 changes. Also, the filtered power of the first GFF 301 is generally not dynamically adjustable. Therefore, when the power of the optical signal input to the first SOA 102 is changed, the effect of the first GFF 301 is reduced. When the power of the optical signal input to the first OFA 103 changes, the flatness of the optical signal output from the first OFA 103 also changes. For this reason, the embodiment of the present application can compensate for the flatness variation due to the first SOA 102 by the influence of the first OFA 103 on the flatness. This is described below.
Fig. 4 is a schematic diagram of a fourth structure of an optical amplifying device according to an embodiment of the present application. As shown in fig. 4, the optical amplifying device 100 further includes an adjustable optical attenuator (variable optical attenuator, VOA) 402, a third PD 401, and a fourth PD 403 on the basis of fig. 3.VOA 402 is located between first SOA 102 and first OFA 103. The third PD 401 is located between the first SOA 102 and the VOA 402. The fourth PD 403 is located between the first OFA 103 and the VOA 402. The third PD 401 is configured to obtain a third power of an optical signal input to the VOA 402. The fourth PD 403 is configured to obtain a fourth power of the optical signal output from the VOA 402. The processor 104 is configured to adjust the attenuation values of the VOA402 based on the third power and the fourth power. Wherein the power of the optical signal input to first OFA 103 can be adjusted by adjusting the attenuation value of VOA 402. The power of the optical signal input to the first OFA 103 affects the flatness of the optical signal. Therefore, the embodiment of the present application can compensate for the flatness variation due to the first SOA 102 by the influence of the first OFA 103 on the flatness. Therefore, in the embodiment of the present application, by adjusting the attenuation value of the VOA402, the power balance of the optical signal at different wavelengths can be improved, so as to improve the reliability of optical communication.
It should be appreciated that when the overall gain target varies, the flatness of the optical signal output by the optical amplifying device 100 may also vary. At this time, the flatness of the optical signal output from the optical amplifying device 100 can also be adjusted by adjusting the attenuation value of the VOA 402. The specific adjustment value can be calibrated in advance. For example, when the input power of the optical amplification device 100 is 0.5 decibel milliwatts (decibel relative to one milliwatt, dBm) and the overall gain target is 22dB, the attenuation value of the VOA402 is 9.5dB. When the input power of the optical amplification apparatus 100, 8.5dBm, is 31dB for the overall gain target, the attenuation value of the VOA402 is 0.5dB.
In practical applications, when the same gain target is achieved by two OFAs and one OFA, respectively, the two OFAs need to consume lower power. Therefore, in order to reduce the power consumption of the optical amplifying device 100, the optical amplifying device 100 can power-amplify the optical signal by two OFAs. Fig. 5 is a schematic diagram of a fifth structure of an optical amplifying device according to an embodiment of the present application. As shown in fig. 5, the optical amplifying device 100 further includes a second OFA 501 on the basis of fig. 4. The second OFA 501 is located between the first SOA 102 and the first OFA 103. In fig. 5, a first SOA 102 is used to perform a first stage amplification of an optical signal. The second OFA 501 is used for performing secondary amplification on the optical signal. The first OFA 103 is used for three-stage amplification of an optical signal.
It should be understood that fig. 5 is only one example of the optical amplifying device 100 provided in the embodiment of the present application. In fig. 5, the first GFF 301 is located between the second OFA 501 and the VOA 402. In practical applications, the locations between the first GFF 301, the second OFA 501, and the VOA 402 may be combined at will. This is described below by way of example.
Fig. 6 is a schematic diagram of a sixth structure of an optical amplifying device according to an embodiment of the present application. As shown in fig. 6, the positional relationship of the second OFA501 and the first GFF 301 is modified on the basis of fig. 5. Specifically, in fig. 5, the position of the second OFA501 is before the position of the first GFF 301. At this time, the first GFF 301 is located between the second OFA501 and the VOA 402. In fig. 6, the position of the second OFA501 is after the position of the first GFF 301. At this time, the second OFA501 is located between the first GFF 301 and the VOA 402. In the embodiment of the present application, by advancing the position of the first GFF 301, the power consumption of the optical amplifying device 100 can be reduced.
Fig. 7 is a schematic diagram of a seventh structure of an optical amplifying device according to an embodiment of the present application. As shown in fig. 7, the positional relationship of the second OFA 501, the VOA 402, and the first GFF 301 is modified on the basis of fig. 5. Specifically, in fig. 5, the location of VOA 402 is after the location of first GFF 301. In fig. 6, the position of VOA 402 is before the position of first GFF 301. Further, in fig. 5, the first GFF 301 is located between the second OFA 501 and the VOA 402. In fig. 6, a second OFA 501 is located between the first GFF 301 and the VOA 402. In an embodiment of the present application, by advancing the position of the VOA 402, the power consumption of the optical amplifying device 100 can be reduced.
In the foregoing fig. 5, the first GFF 301 is located after the first SOA 102 and the second OFA 501. The first GFF 301 is used to reduce the effect of the first SOA 102 and the second OFA 501 on the flatness of the optical signal. In fig. 6, the first GFF 301 is located after the first SOA 102 and before the second OFA 501. The first GFF 301 is used to reduce the effect of the first SOA 102 on the flatness of the optical signal. In practice, the optical amplification device 100 may include 2 GFFs. The 2 GFFs are used to reduce the effect of the first SOA 102 and the second OFA 501 on the flatness of the optical signal, respectively. Fig. 8 is a schematic diagram of an eighth structure of an optical amplifying device according to an embodiment of the present application. As shown in fig. 8, the optical amplification device 100 further includes a second GFF 801 in addition to fig. 5. The second GFF 801 is located between the first SOA 102 and the second OFA 501. The second GFF 801 is configured to receive an optical signal from the first SOA 102 and filter the optical signal. In the embodiment of the present application, by adding the second GFF 801, the power consumption of the optical amplifying device 100 can be reduced.
In the foregoing example of fig. 5, the power consumption of the optical amplifying device 100 is reduced by two OFAs. Similarly, to reduce the power consumption of the optical amplifying device 100, the optical amplifying device 100 may also power amplify the optical signal through two SOAs. Fig. 9 is a ninth schematic structural diagram of an optical amplifying device according to an embodiment of the present application. As shown in fig. 9, the second OFA 501 in fig. 8 is replaced with a second SOA 901 on the basis of fig. 8. In fig. 9, the second SOA 901 is located between the first SOA 102 and the first OFA 103. In fig. 9, a first SOA 102 is used to perform a first stage amplification of an optical signal. The second SOA 901 is used for secondary amplification of the optical signal. The first OFA 103 is used for three-stage amplification of an optical signal.
From the description of fig. 1, it can be seen that SOAs introduce a significant non-linear penalty at high power outputs. In order to reduce the non-linear penalty introduced by the second SOA 901. The processor 104 may be configured to obtain a second threshold value from the power of the optical signal input to the second SOA 901 and the second threshold value to obtain a second electrical signal. The current or voltage of the second electrical signal is less than or equal to a second threshold. The second SOA 901 is configured to power amplify the optical signal according to the second electrical signal. The power of the optical signal input to the second SOA 901 may be obtained by other PDs, or may be obtained by the first PD 101. The other PD is located between the second SOA 901 and the first SOA 102. The other PD is used to measure the power of the optical signal input to the second SOA 901. The first PD 101 is configured to measure a first power of an optical signal input to the first SOA 102. The processor 104 is configured to calculate the power of the optical signal input to the second SOA 901 based on the first power, the gain of the first SOA 102, and the filtered insertion loss of the second GFF 801.
It should be understood that the foregoing fig. 1 to 9 are only a few examples of the structures of the optical amplifying device 100 provided by the embodiments of the present application. In practical applications, the structure of the optical amplifying device 100 can be adaptively modified by those skilled in the art according to requirements. Adaptations include, but are not limited to, the contents of any one or more of the following.
1. In any of the figures 1-9, the processor 104 includes a first sub-processor and a second sub-processor. The second sub-processor is configured to generate a first electrical signal of the first SOA 101 and/or a second electrical signal of the second SOA 901. The first sub-processor is responsible for overall gain allocation and feedback adjustment of the optical amplifying device 100. For example, in fig. 2, the first sub-processor is configured to obtain a first gain target for the first SOA 102 and a second gain target for the first OFA 103 based on the overall gain target. The first sub-processor is configured to assign a first gain target to the second sub-processor. The second sub-processor is configured to generate a first electrical signal based on the first gain target. The second sub-processor is further configured to obtain a first power of the optical signal, and obtain a first threshold according to the first power of the optical signal and the first mapping relationship. The second sub-processor is configured to transmit the first electrical signal to the first SOA 102 if the current or voltage of the first electrical signal is less than or equal to the first threshold. The second sub-processor is configured to transmit an alarm signal to the first sub-processor if the current or voltage of the first electrical signal is greater than a first threshold. The alert signal is used to request the first sub-processor to modify the first gain target. The first sub-processor is further configured to generate a driving signal of the first OFA 103 according to the second gain target, and transmit the driving signal to the first OFA 103. The first sub-processor is further configured to obtain an actual overall gain based on the first power and the second power measured by the second PD 201, and adjust the gain of the first SOA 102 and/or the first OFA 103 based on the actual overall gain and the overall gain target.
2. In fig. 4, the position of the first GFF 301 and the position of the VOA 402 are interchanged. It should be appreciated that in an embodiment of the present application, the third PD401 and VOA 402 are bound to each other. Therefore, when the position of the VOA 402 changes, the positions of the third PD401 and the fourth PD 403 also change. At this time, the third PD401 is used to measure the power of the optical signal output by the first SOA 102, i.e., the third PD401 is used to measure the power of the optical signal input to the VOA 402. At this time, the third PD401 may be the detection PD of the first SOA 102. The power measured by the third PD401 may be used to determine whether the power of the optical signal output by the first SOA 102 is less than or equal to the target power.
3. In fig. 9, the second GFF 801 is located after the first SOA 102. The second GFF 801 is used to reduce the effect of the first SOA102 on the flatness of the optical signal. The first GFF 301 is located after the second SOA 901. The first GFF 301 is used to reduce the effect of the second SOA 901 on the flatness of the optical signal. In practice, the optical amplification device 100 may not include the second GFF 801. At this time, the first GFF 301 serves to reduce the influence of the first SOA102 and the second SOA 901 on the flatness of the optical signal.
4. The optical amplifying device 100 may further include a memory. The memory may be volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an erasable programmable ROM (erasable PROM, EPROM), or a flash memory. The volatile memory may be random access memory (random access memory, RAM). The memory is used for storing the first mapping relation.
The light amplifying device 100 provided by the embodiment of the present application is described above. The following describes an optical communication device, an optical communication system, and an optical amplification method provided by the embodiments of the present application.
Fig. 10 is a schematic structural diagram of an optical communication device according to an embodiment of the present application. As shown in fig. 10, the optical communication apparatus 1000 includes an optical transmission module 1001 and an optical amplifying device 100. The optical transmitting module 100 is configured to modulate a carrier beam according to an electrical signal to obtain an optical signal. The optical amplifying device 100 is used for power amplifying an optical signal. As for the description of the light amplifying device 100, reference may be made to the description in any of the foregoing fig. 1 to 9.
Fig. 11 is a schematic structural diagram of an optical communication system according to an embodiment of the present application. As shown in fig. 11, the optical communication system 1100 includes an optical communication apparatus 1000 and another optical communication apparatus 1101. The optical communication device 1000 is configured to modulate a carrier beam according to an electrical signal to obtain an optical signal. The optical communication device 1000 is further configured to power amplify an optical signal, and transmit the power amplified optical signal to another optical communication device 1101. The other optical communication device 1102 is configured to receive an optical signal, and demodulate the optical signal to obtain an electrical signal.
In practical applications, the optical communication system 1100 may also include a relay device. The relay device is located on an optical transmission path between the optical communication device 1000 and another optical communication device 1101. The relay device comprises one or more optical amplifying means 100. The relay device is used for power amplifying an optical signal in an optical transmission path by the optical amplifying device 100.
Fig. 12 is a flow chart of an optical amplifying method according to an embodiment of the present application. As shown in fig. 12, the light amplification method includes the following steps.
In step 1201, the optical amplifying device acquires a first threshold value and a first power of the optical signal.
The optical amplification device obtains a first gain target for the first SOA and a second gain target for the first OFA based on the overall gain target. The optical amplifying device acquires a first power of an optical signal input to a first SOA through a first PD. The optical amplifying device acquires a first mapping relation. The first mapping relationship includes a correspondence relationship between power of the plurality of optical signals and a plurality of thresholds. The first mapping relationship may be obtained by calibrating the first SOA before the first SOA leaves the factory. The optical amplifying device is used for obtaining a first threshold value according to the first power of the optical signal and the first mapping relation.
In step 1202, the optical amplifying device generates a first electrical signal according to a first power, a current or voltage of the first electrical signal being less than or equal to a first threshold.
The optical amplifying device may acquire a power-up curve of the first SOA. The power-up curve of the first SOA characterizes a correspondence of a gain target of the first SOA to the electrical signal. The optical amplification device obtains a first electrical signal according to a first gain target and a power-up curve of a first SOA. The optical amplifying device transmits the first electrical signal to the first SOA if the current or voltage of the first electrical signal is less than or equal to the first threshold. If the current or voltage of the first electrical signal is greater than the first threshold, the optical amplification device modifies the first gain target such that the voltage or current of the first electrical signal is less than or equal to the first threshold.
In step 1203, the optical amplification apparatus amplifies the optical signal through the first electrical signal and the first SOA. The optical amplification device transmits a first electrical signal to the first SOA. The first electrical signal acts as a drive signal for the first SOA. The first SOA amplifies the optical signal based on the first electrical signal.
In step 1204, the optical amplifying device amplifies the optical signal again by the first OFA, and outputs the optical signal.
The location of the first OFA is located after the location of the first SOA. The optical amplifying device may acquire a power-up curve of the first OFA. The powered curved edge of the first OFA characterizes a correspondence of the gain target of the first OFA to the electrical signal. The optical amplifying device obtains a driving signal of the first OFA according to the second gain target and the power-on curve of the first OFA. The optical amplifying device transmits a driving signal to the first OFA, and amplifies the optical signal again by the driving signal.
It should be appreciated that the description of the light amplification method is similar to that of the light amplification apparatus 100 described above. Accordingly, the description of the light amplification method may refer to the description in any of the foregoing fig. 1 to 9. For example, the light amplification method further comprises the steps of: the optical amplifying device adjusts the gain of the first SOA and/or the first OFA according to the output power target and the actual output power of the optical amplifying device. As another example, the optical amplification method further includes the steps of: the optical amplification device filters the optical signal through the first GFF. As another example, the optical amplification method further includes the steps of: the optical amplifying device amplifies the optical signal again through the second SOA.
The foregoing is merely illustrative embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present application, and the application should be covered.

Claims (19)

1. An optical amplifying device comprising a first semiconductor optical amplifier SOA, a first optical fiber amplifier OFA, a first power detector PD and a processor, wherein:
the first PD is used for acquiring first power of an optical signal and transmitting the first power to the processor;
the processor is used for acquiring a first threshold value, transmitting a first electric signal to the first SOA according to the first power, and the current or voltage of the first electric signal is smaller than or equal to the first threshold value;
the first SOA is used for amplifying the optical signal according to the first electrical signal and transmitting the optical signal to the first OFA;
The first OFA is used for amplifying the optical signal and outputting the optical signal.
2. The optical amplification device of claim 1, further comprising a second PD;
The second PD is used for acquiring second power of the optical signal output by the first OFA and transmitting the second power to the processor;
the processor is further configured to adjust a gain of the first SOA and/or the first OFA according to the first power and the second power.
3. The optical amplification device of claim 1 or 2, further comprising a tunable optical attenuator, VOA, a third PD, and a fourth PD, the VOA being located between the first SOA and the first OFA;
the third PD is configured to obtain a third power of the optical signal input to the VOA;
the fourth PD is configured to obtain a fourth power of the optical signal output from the VOA;
The processor is configured to adjust an attenuation value of the VOA based on the third power and the fourth power.
4. An optical amplifying device according to any one of claims 1 to 3, further comprising a first gain flattening filter GFF, said first GFF being located between said first SOA and said first OFA.
5. The optical amplification device of any one of claims 1 to 4 further comprising a second OFA, the second OFA being located between the first SOA and the first OFA.
6. The optical amplification device of claim 5 further comprising a first gain flattening filter GFF, the first GFF being located between the first SOA and the first OFA.
7. The optical amplification device of claim 6 further comprising a second GFF located between the first SOA and the second OFA, the first GFF located between the second OFA and the first OFA.
8. The optical amplification device of any one of claims 1 to 5 further comprising a second SOA located between the first SOA and the first OFA.
9. The light amplification device of claim 8, wherein,
The processor is further configured to obtain a second threshold, and transmit a second electrical signal to the second SOA according to the first power, where a current or a voltage of the second electrical signal is less than the second threshold;
the second SOA is configured to amplify the optical signal according to the second electrical signal.
10. The light amplification device of claim 9, wherein the second threshold is greater than the first threshold.
11. The optical amplifying device according to any one of claims 1 to 10, wherein the wavelength of the optical signal is in the L-band.
12. An optical communication apparatus comprising an optical transmission module and the optical amplifying device of any one of the preceding claims 1 to 11, wherein:
The optical transmitting module is used for modulating a carrier beam according to the electric signal to obtain an optical signal;
the optical amplifying device is used for amplifying the optical signal.
13. A method of amplifying light, comprising:
the optical amplifying device acquires a first threshold value and first power of an optical signal;
The optical amplifying device generates a first electric signal according to the first power, and the current or voltage of the first electric signal is smaller than or equal to a first threshold value;
The optical amplifying device amplifies the optical signal through the first electrical signal and a first Semiconductor Optical Amplifier (SOA);
The optical amplifying device amplifies the optical signal again through the first optical fiber amplifier OFA and outputs the optical signal.
14. The method of light amplification of claim 13, further comprising:
The optical amplifying device acquires second power of the optical signal output by the first OFA;
the optical amplification device adjusts the gain of the first SOA and/or the first OFA according to the first power and the second power.
15. The method of light amplification according to claim 13 or 14, wherein the method further comprises:
The optical amplifying means acquires a third power of the optical signal input to the variable optical attenuator VOA and a fourth power of the optical signal output from the VOA;
The optical amplifying device adjusts the attenuation value of the VOA according to the third power and the fourth power.
16. The method of light amplification according to any one of claims 13 to 15, further comprising:
The optical amplifying device amplifies the optical signal output by the first SOA again through the second OFA.
17. The method of light amplification according to any one of claims 13 to 15, further comprising:
the optical amplifying device acquires a second threshold value;
the optical amplifying device generates a second electric signal according to the first power, and the current or voltage of the second electric signal is smaller than or equal to a second threshold value;
the optical amplifying device amplifies the optical signal output by the first SOA again through the second electrical signal and the second SOA.
18. The method of light amplification of claim 17, wherein the second threshold is greater than the first threshold.
19. The method of light amplification according to any one of claims 13 to 18, further comprising:
The optical amplifying means filters the optical signal by means of a first gain flattening filter GFF.
CN202310216421.7A 2023-02-27 2023-02-27 Optical amplification device, optical communication apparatus, and optical amplification method Pending CN118555009A (en)

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