WO2008098457A1 - Dispositif de détection du décalage spectral, système de verrouillage des longueurs d'ondes et procédés associés - Google Patents

Dispositif de détection du décalage spectral, système de verrouillage des longueurs d'ondes et procédés associés Download PDF

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Publication number
WO2008098457A1
WO2008098457A1 PCT/CN2007/071075 CN2007071075W WO2008098457A1 WO 2008098457 A1 WO2008098457 A1 WO 2008098457A1 CN 2007071075 W CN2007071075 W CN 2007071075W WO 2008098457 A1 WO2008098457 A1 WO 2008098457A1
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WIPO (PCT)
Prior art keywords
signal
optical
wavelength
identification information
module
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PCT/CN2007/071075
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English (en)
French (fr)
Inventor
Minhai Tu
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Huawei Technologies Co., Ltd.
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Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to EP07817265A priority Critical patent/EP2112728A4/en
Publication of WO2008098457A1 publication Critical patent/WO2008098457A1/zh
Priority to US12/424,039 priority patent/US8190033B2/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/068—Stabilisation of laser output parameters
    • H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
    • H01S5/0687—Stabilising the frequency of the laser
    • 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
    • H04B10/50—Transmitters
    • H04B10/572—Wavelength control

Definitions

  • Wavelength drift detecting device Wavelength drift detecting device, wavelength locking system and method thereof
  • the present invention relates to the field of optical communication technologies, and in particular to a wavelength drift detecting device, a wavelength locking system, and a method thereof in a Dense Wavelength Division Multiplexing (DWDM) system.
  • DWDM Dense Wavelength Division Multiplexing
  • DWDM is a technology used to increase bandwidth on existing fiber networks. This technology enhances the transmission capability of a single fiber by transmitting multiple signals of different wavelengths in a single fiber using dense wavelength division multiplexing. When the number of optical fibers is limited, the wavelength division multiplexing system is one of the effective methods for increasing the transmission capacity.
  • the interval between channels decreases, so it is important to control the center frequency deviation of each channel.
  • the source In order to make the spectral energy of each channel signal must be within the passband of the corresponding optical demultiplexer, the source is required to be controlled by the ambient temperature and humidity (or temperature dependence), and the deviation of the center frequency during the lifetime is controlled within a certain range.
  • optical modules can be operated with constant temperature and power control.
  • wavelength locking For optical modules with 50G intervals and below, because of the higher requirements for wavelength stability and accuracy control, wavelength locking must be used for control. The following is a brief description of the existing wavelength locking implementation.
  • FIG. 1 is a schematic structural diagram of a first implementation manner.
  • the optical module includes a feedback controller 110, a laser transmitter 120, and means 130 for locking the wavelength.
  • a small portion of the light emitted by the laser emitter 120 is split into means 130 for locking the wavelength, and the means for locking the wavelength includes a wavelength locker 131 and a process control module 132.
  • the wavelength locker 131 receives the input optical signal and outputs two signals to the processing control module 132. For the two outputs: one is a branch of the input signal used as a reference signal, the signal is unprocessed, and the other is passed The signal output after the standard grid is compared.
  • the processing control module 132 controls the drift of the wavelength according to the deviation of the received two signals, outputs a feedback signal to the feedback controller 110, and controls the laser emitter 120 by the feedback controller 110 to make the output of the laser emitter 120.
  • the feedback controller 110 has functions such as controlling the wavelength shift by controlling the temperature of the laser die, power, and the like.
  • Fig. 1 ensures wavelength stabilization, it is used to lock the wavelength of the device 130 into the optical module.
  • each laser is required to use a separate device 130 for locking the wavelength, thereby causing each light.
  • Increase in module cost In the DWDM system, there are usually many optical modules, and the overall cost increase is obvious.
  • FIG. 2 is a schematic structural diagram of a second implementation manner.
  • only the feedback controller and the laser emitter are included in each optical module, such as the optical module 160a to the optical module 160n in FIG.
  • the optical signals output by the respective optical modules are combined into one optical signal output by the combiner 150, and a small portion of the optical signals are split by the optical splitter 140 to introduce a device 130 for locking the wavelength.
  • the device 130 for locking the wavelength includes wavelength locking.
  • the wavelength selection module 133 receives the optical signal input by the optical splitter 140, selects a wavelength to be locked from the optical signals of different wavelengths according to a preset configuration strategy, and sends the optical signal corresponding to the wavelength to the wavelength locker 131.
  • the wavelength locker 131 outputs two signals to the processing control module 132, and processes the control module.
  • the output feedback signal is sent to the feedback controller in the optical module corresponding to the locked wavelength to achieve the purpose of controlling the laser emitter in an optical module, so that the wavelength of the output of the optical module remains stable.
  • This part of the processing is identical to the processing of the corresponding part shown in Figure 1.
  • the optical signals of the respective wavelengths are sequentially selected by the wavelength selecting module 133, so that selection and locking of all wavelengths can be realized.
  • the device needs to include a single wavelength selection module, and the cost of the wavelength selection module is high, from the perspective of implementation cost.
  • the program is still not optimal.
  • the wavelength selective module is usually composed of mechatronic devices and optical devices, the process of selecting a wavelength from a beam of optical signals takes a long time, and the number of times of use of the electromechanical device is limited and the reliability is low. In order to meet the requirements of the service life of telecommunication equipment, a long lock interval must be used. This causes a reduction in the locking accuracy.
  • FIG. 3 is a schematic structural view of a third implementation of the prior art. It is substantially the same as the structure shown in FIG. 2, except that the low frequency scrambling module 170 is added to add a low frequency modulation signal fl ⁇ f n of different frequencies to the laser transmitter in each optical module.
  • the modulation frequency is generally below tens of KHz, and the frequency spacing of different wavelengths ranges from 100% to ⁇ in the modulation range of 1% to 5%.
  • the wavelength extraction module is added to the wavelength-locking device 130 and the wavelength extraction module is added.
  • the processing of the device 130 for locking the wavelength is: the wavelength locker 131 receives the optical signal input by the optical splitter 140, outputs two signals to the wavelength extraction module 134, and performs digital signal processing by the wavelength extraction module 134, according to different modulations.
  • the signal frequency distinguishes different wavelengths, and the wavelength to be processed is transmitted to the processing control module 132.
  • the processing control module 132 determines the offset from the standard wavelength according to the received wavelength, and outputs a feedback signal to the locked wavelength.
  • the purpose of controlling the laser emitter in the optical module is achieved, so that the wavelength of the output of the optical module remains stable.
  • This part of the processing is identical to the processing of the corresponding part shown in Figure 1.
  • the wavelength extraction module 134 sequentially demodulates and resolves the respective wavelengths to achieve selection and locking of all wavelengths.
  • Embodiments of the present invention provide a wavelength shift detecting device, a wavelength locking system, and a method thereof, which can reduce cost, increase locking speed, and wavelength locking stability.
  • a wavelength drift detecting device comprising:
  • the wavelength locking module is configured to receive the optical signals outputted by the plurality of optical modules and output the combined signals, and output two signals, one is an unprocessed signal, and the other is a signal processed by a wavelength etalon; Only one optical signal in the road signal carries identification information;
  • a signal processing module configured to receive two signals from the wavelength locking module, extract a signal with identification information from each signal, and calculate the optical module according to the power of the two identification information signals The wavelength drift value of the output optical signal.
  • a system for locking a wavelength comprising an optical module and a multiplexer unit, the system further comprising: a wavelength drift detecting device and a processing control module, wherein
  • the wavelength drift detecting device is configured to receive an optical signal outputted by a plurality of optical modules and combined by the combining unit, wherein only one optical signal of the two signals carries identification information; determining the identifier information a wavelength drift value of the optical signal, the drift value is transmitted to the processing control module;
  • the processing control module is configured to instruct one of the plurality of optical modules to output an optical signal with the identification information; calculate a feedback signal for controlling the wavelength offset according to the drift value; and transmit the feedback signal to An optical module corresponding to the optical signal of the identification information;
  • the optical module is configured to adjust a wavelength of the output optical signal according to the feedback signal after receiving the feedback signal.
  • a wavelength drift detection method includes:
  • Receiving a plurality of optical module outputs and multiplexed optical signals, outputting two signals, one is an unprocessed optical signal, and the other is an optical signal after being processed by a wavelength etalon; the two signals are There is only one optical signal with identification information;
  • a signal with identification information is extracted from the two signals, and the two signals with the identification information signal are determined, and the wavelength drift value of the optical signal output by the optical module is calculated according to the power.
  • a method for locking a system wavelength comprising:
  • the multiplexed optical signal is output by a plurality of optical modules, and only one of the plurality of optical modules outputs an optical signal with identification information; a wavelength drift value of the optical signal having the identification information;
  • the optical module receiving the feedback signal adjusts the wavelength of the output optical signal according to the feedback signal; after instructing the optical module to cancel the output of the optical signal with the identification information, indicating the output of the other optical module of the plurality of optical modules An optical signal with the same identification information locks each optical module in turn.
  • an optical module outputs an optical signal with identification information, and determines a drift value between the wavelength of the optical signal with the identification information and the standard wavelength; and outputs the wavelength offset according to the drift value. a feedback signal to the output optical module with identification information. Thereby, the purpose of locking the output wavelength of the optical module is achieved.
  • not only a plurality of optical modules can share a set of devices for locking wavelengths, but also a wavelength selection module is not required, because only one optical module outputs an optical signal with identification information at the same time, and different optical modules output.
  • the identification information is the same, which simplifies the complexity of the device and eliminates the interference between the identification information, because the electromechanical device is not used to control the wave.
  • the long switching reduces the cost, increases the locking speed, and improves the accuracy of signal processing, thereby improving the accuracy of wavelength locking.
  • FIG. 1 is a schematic structural view of a first implementation manner
  • FIG. 2 is a schematic structural view of a second implementation of the prior art
  • FIG. 3 is a schematic structural view of a third implementation of the prior art
  • Figure 5 is a block diagram showing the structure of another embodiment of the present invention.
  • each of the optical modules includes a feedback controller, a laser transmitter, and a low frequency modulation module, such as the optical module 160a to the optical module 160n in FIG.
  • the optical signals output by the respective optical modules are combined into one optical signal output through a multiplexer unit such as the combiner 150, and a small portion of the optical signals are split by the optical splitter 140 to introduce a device 130 for locking the wavelength.
  • the device for locking the wavelength 130 includes a wavelength shift detection device and a process control module 132.
  • the wavelength shift detecting device includes a wavelength locking module 131 and a signal processing module 135.
  • control optical module 160a will be described as an example.
  • a wavelength drift detecting device configured to receive an optical signal output by a plurality of optical modules and combined by the combining unit, and determine a wavelength drift value of the optical signal outputted by the optical module 160a corresponding to the signal with the identification information, The drift value is transmitted to the process control module 132;
  • the processing control module 132 is configured to instruct one of the plurality of optical modules, that is, the optical module 160a, to output an optical signal with the identification information, and compare the received drift value with the set threshold to determine the drift. When the value is greater than or equal to the threshold value, the feedback signal for controlling the wavelength offset is calculated according to the drift value; and the optical module corresponding to the optical signal with the identification information is transmitted to the optical module. 160a;
  • the signal with the identification information is a signal that is scrambled by a low frequency, or a signal that is scrambled by a code division;
  • the optical module 160a which is the optical module that receives the feedback signal, adjusts the wavelength of the output optical signal according to the feedback signal.
  • the wavelength drift detecting device includes: a wavelength locking module 131 and a signal processing module 135.
  • the wavelength locking module 131 in this example is implemented by a wavelength locker, which is directly available in the existing market. Device.
  • a wavelength locker is used to receive a plurality of optical module outputs and combine the combined optical signals into two signal outputs, one of which is an unprocessed signal, which may be referred to as a reference signal (hereinafter similar to the same)
  • the other is a signal processed by the wavelength etalon; wherein, only one of the plurality of optical modules outputs an optical signal with the identification information;
  • the signal processing module 135 is configured to receive two signals from the wavelength locker, extract signals with identification information from each of the signals, determine the power of the two signals with the identification information, and calculate the light according to the power.
  • the wavelength drift value of the optical signal output by the module is configured to calculate the light according to the power.
  • the wavelength locking module 131 may further include a photoelectric conversion unit (not shown). At this time, the photoelectric conversion unit is configured to respectively convert the unprocessed signal and the optical signal after the wavelength etalon comparison processing into an electrical signal. Then output.
  • a photoelectric conversion unit (not shown). At this time, the photoelectric conversion unit is configured to respectively convert the unprocessed signal and the optical signal after the wavelength etalon comparison processing into an electrical signal. Then output.
  • the signal processing module 135 may include: an identification signal extraction unit and a calculation unit (not shown).
  • the identification signal extraction unit is configured to separately extract a signal with identification information from each electrical signal; and transmit the signal with the identification information to the calculation unit;
  • the identification signal extraction unit may be a low frequency signal extraction unit or a code division signal
  • the low frequency signal extraction unit may be a low frequency band pass filter, which may be a digital filtering device such as a CPU or a digital signal processor (DSP), or may be a filtering device composed of electronic devices;
  • the calculation unit is configured to determine the power of the two identification information signals from the identification signal extraction unit, and calculate the wavelength drift value of the optical signal output by the optical module according to the power.
  • the signal processing module 135 may include: a photoelectric conversion unit, an identification signal extraction unit, and a calculation unit, where
  • the photoelectric conversion unit is configured to separately convert the received two optical signals into electrical signals
  • the identification signal extraction unit is configured to separately extract a signal with identification information from each electrical signal; and transmit the signal with the identification information to the calculation unit;
  • the identification signal extraction unit may be a low frequency band pass filter, which may Is a digital filtering device, such as a CPU or a digital signal processor (DSP), or a filtering device composed of electronic devices;
  • the calculation unit is configured to determine the power of the two identification information signals from the identification signal extraction unit, and calculate the wavelength drift value of the optical signal output by the optical module according to the power.
  • the photoelectric conversion operation can be performed by the wavelength locking module 131 or by the signal processing module 135.
  • the wavelength drift detecting device may further include: a multiplexed signal selecting unit configured to select one of the plurality of multiplexed cells to input the wavelength locking module when the plurality of multiplexing units are present.
  • the multiplex signal selection unit may be a ⁇ ⁇ switch or a coupler.
  • the above-mentioned processing control module 132 is further configured to indicate that the optical module that receives the feedback signal, that is, the optical module 160a, cancels outputting the optical signal with the identification information, and then indicates another optical module, such as the optical module 160b, of the plurality of optical modules. An optical signal with the same identification information is output, so that each optical module can be locked in turn. Wherein, when each optical module outputs an optical signal with identification information, the applied identification information is the same.
  • the processing control module 132 controls the low frequency modulation module in the optical module through the communication and control bus to instruct the optical module to output the low frequency scrambled optical signal and cancel the low frequency scrambled optical signal, and pass the feedback in the optical module.
  • the controller implements control of the laser emitter to achieve the purpose of locking the wavelength.
  • the feedback controller has functions such as controlling the wavelength shift by controlling the temperature and power of the laser die.
  • the optical signal with the identification information in this embodiment is the low-frequency scrambled optical signal output by the optical module, and the scrambling frequencies of all the optical modules are the same, such as the frequency f.
  • the embodiment of the present invention further provides a wavelength drift detecting device.
  • the wavelength drift detecting device includes: a wavelength locking module and a signal processing module.
  • the wavelength locking module is configured to receive the optical signals outputted by the plurality of optical modules and combine the combined signals into two signals, one is an unprocessed signal, and the other is a signal processed by a wavelength etalon; the complex number Only one of the optical modules, such as the optical module 160a, outputs an optical signal with identification information, and the signal with the identification information is a signal that is scrambled by the low frequency or a signal that is scrambled by the code division; the wavelength locking module 131 can be implemented by a wavelength locker;
  • the signal processing module is configured to receive two signals from the wavelength locking module, extract a signal with identification information from each signal, determine the power of the two signals with the identification information, and calculate the optical module according to the power.
  • the wavelength shift value of the output optical signal is configured to receive the optical signals outputted by the plurality of optical modules and combine the combined signals into two signals, one is an unprocessed signal, and the other is a signal processed by a wavelength etalon; the complex number Only one of the optical
  • the wavelength locking module may further include a photoelectric conversion unit for respectively converting the unprocessed signal and the optical signal subjected to the comparison by the wavelength etalon into an electrical signal and then outputting.
  • the signal processing module may include: an identification signal extraction unit and a calculation unit,
  • the identification signal extraction unit is configured to separately extract a signal with identification information from each electrical signal; and transmit the signal with the identification information to the calculation unit;
  • the identification signal extraction unit may be a low frequency signal extraction unit or a code division
  • the low frequency signal extraction unit may be a low frequency band pass filter, which may be a digital filtering device such as a CPU or a digital signal processor (DSP), or may be a filtering device composed of electronic devices;
  • the calculation unit is configured to determine the power of the two identification information signals from the identification signal extraction unit, and calculate the wavelength drift value of the optical signal output by the optical module according to the power.
  • the signal processing module may include: a photoelectric conversion unit, an identification signal extraction unit, and a calculation unit.
  • the photoelectric conversion unit is configured to separately convert the received two optical signals into electrical signals
  • the identification signal extraction unit is configured to separately extract a signal with identification information from each electrical signal; and transmit the signal with the identification information to the calculation unit;
  • the identification signal extraction unit may be a low frequency signal extraction unit or a code division signal
  • the low frequency signal extraction unit may be a low frequency band pass filter, which may be a digital filtering device such as a CPU or a digital signal processor (DSP), or may be a filtering device composed of electronic devices.
  • the calculation unit is configured to determine the power of the two identification information signals from the identification signal extraction unit, and calculate the wavelength drift value of the optical signal output by the optical module according to the power.
  • the wavelength drift detecting apparatus may further include: a multiplexed signal selecting unit configured to select a multiplexed signal output from one of the plurality of multiplexer units, and input the wavelength locking module.
  • the signal processing module in the wavelength drift detecting device may further include an output unit for outputting the drift value.
  • FIG. 5 is a schematic structural diagram of another embodiment of the present invention, which is different from FIG. 4 in that: all optical modules in the system share a modulation module 180 located outside the optical module to achieve output to an optical module. The purpose of the signal scrambling is the same as that of the embodiment shown in FIG. 4 and will not be described again.
  • the embodiment of the invention further discloses a method for locking a system wavelength, comprising:
  • One of the plurality of optical modules outputs an optical signal with identification information.
  • the signal with the identification information may be a signal that has been scrambled by the low frequency, or a signal that is scrambled by the code division.
  • the optical module usually has an interface for adding low frequency modulation, and the logic device can generate a low frequency signal of a specific frequency, and the low frequency signal is added to the optical module from the interface, so that the output can be output.
  • the optical signal is added to the low frequency disturbance to identify the optical signal.
  • the frequency of the low frequency disturbance can be from 1 to ⁇ ⁇ , and the modulation depth can be from 1% to 5%.
  • adding a low frequency disturbance to the optical module is a method for adding identification information to the optical signal.
  • the optical signal is extracted according to the specific identification method in the subsequent steps. Of course, other methods may be used in other embodiments as long as the optical signal can be identified.
  • the received signal is a composite of multiple optical signals, it cannot be directly used as a basis for wavelength locking. Therefore, it is necessary to extract an optical signal of a specific wavelength to determine the wavelength of the optical signal from the standard wavelength. the amount.
  • the identification information since the identification information has been added to an optical signal in step a, the signal of the wavelength can be extracted according to the identification information. For example, a low frequency disturbance of ⁇ has been added to an optical signal, and a filtering process can be used to extract the ⁇ signal.
  • the specific process for determining the wavelength drift value of the optical signal outputted by the optical module corresponding to the signal with the identification information includes:
  • the wavelength locker divides the signal into two paths by using a splitting device, and one of the signals is directly output without any processing.
  • the signal that is not directly processed for processing will be used as a reference signal.
  • the other signal is compared and processed by the wavelength etalon in the wavelength locker.
  • the wavelength etalon in the wavelength locker is a Fabry-Polo etalon, and the comparison process may be to pass the signal.
  • the interference processing for example, is performed by an etalon interferometer, and the incident light will interfere with each other with different wavelengths to produce different attenuation.
  • the offset of the wavelength of the input signal with respect to the standard wavelength can be judged.
  • the above-mentioned wavelength locker can also be completed by a wavelength locker using a dielectric film filter.
  • the present invention does not limit the type of wavelength locker to be used.
  • One implementation manner of calculating the wavelength drift value according to the power is: a ratio obtained by dividing the reference signal with the identification information and the power value of the signal after the wavelength etalon comparison processing; according to the obtained power ratio, the query A corresponding graph of the power ratio and the wavelength drift value is set in advance to determine the drift value corresponding to the power ratio. Since the specific calculation process of the power ratio, and the setting process of the power ratio and the wavelength drift value corresponding to the chart are completely prior art, the detailed description will not be repeated herein.
  • the method further includes: comparing the drift value with a preset threshold value to determine a feedback signal for controlling the wavelength offset when the drift value is greater than or equal to the threshold value.
  • the optical module receiving the feedback signal adjusts the wavelength of the output optical signal according to the feedback signal; the feedback controller in the optical module finely adjusts the wavelength by controlling the temperature and power of the die according to the obtained feedback signal, thereby maintaining The wavelength is stable.
  • the process of fine-tuning the wavelength is also a prior art and will not be described again. So far, the locking of the output wavelength of one of the plurality of optical modules has been completed. After that, you can also include:
  • the merging unit 1 is used to combine the optical signals output by the optical modules 1 to 5
  • the merging unit 2 is used to combine the optical signals output by the optical modules 6 to 15.
  • the merging unit 3 is configured to combine the optical signals output by the optical modules 16 to 21, and the method may further include: selecting one of the plurality of multiplexed units to input the wavelength for the wavelength locking device for wavelength locking operating. That is, if you consider a multiplexer unit and the subsequent optical modules as a group, you can select a group for wavelength locking.
  • the optical signal with the identification information is a low-frequency scrambled optical signal output by the optical module, and the scrambling frequencies of all the optical modules are the same, such as the frequency f.
  • the process of extracting the signal with the identification information is done by low frequency band pass filtering.
  • the low frequency scrambling is performed by a modulation module, and the modulation module may be located in each optical module, or all optical modules in the system share a modulation module located outside the optical module.
  • the embodiment of the invention further provides a wavelength drift detecting method, including:
  • the above method may further include: selecting one of the plurality of multiplexed units to perform a wavelength locking operation.
  • the above method may further include: outputting the wavelength drift value.
  • the above signal with the identification information is a signal that has been scrambled by the low frequency, or a signal that is scrambled by the code division.
  • the process of extracting the signal with the identification information is completed by low frequency band pass filtering.
  • a plurality of optical modules can share a set of devices for locking wavelengths, and a wavelength selection module for selecting a wavelength of the optical signal is not required, and the optical signal with the identification information can be scrambled.
  • the method realizes that only one optical module output signal is scrambled at the same time, and when different optical modules output optical signals with identification information, the identification information is the same, for example, the scrambling for each optical signal is the same.
  • the frequency thus simplifying the complexity of the scrambling device, eliminating the interference between the scrambled signals, reducing the cost, increasing the locking speed, and improving the accuracy of the signal processing, thereby improving the accuracy of the wavelength locking.

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Description

波长漂移检测装置、 波长锁定系统及其方法
本申请要求于 2007 年 2 月 13 日提交中国专利局、 申请号为 200710079261.7、 发明名称为"波长漂移检测装置、 波长锁定系统及其方法"的 中国专利申请的优先权， 其全部内容通过引用结合在本申请中。
技术领域
本发明涉及光通信技术领域， 特别是指密集波分复用 （DWDM, Dense Wavelength Division Multiplexing )系统中波长漂移检测装置、 波长锁定系统及 其方法。
背景技术
随着宽带业务的迅速增长， 对于传送带宽提出了更高的需求。 DWDM是 一项用来在现有的光纤网络上提高带宽的技术。该技术通过在一根光纤中釆用 密集波分复用的方法传送多路不同波长的信号， 从而提升单光纤的传输能力。 当光纤数量有限时， 波分复用系统是有效的增大传输容量的方法之一。
在 DWDM系统中， 随着传输通道数的增加， 通道的间隔不断减小， 因此 控制各通道的中心频率偏差就非常重要了。为了使各信道信号光谱能量必须在 相应光解复用器通带之内， 要求光源在受环境温度、 湿度的影响（或温度相关 性）下， 寿命期内中心频率的偏差控制在一定的范围内。 对于 100G间隔及其 以上的光模块可以釆用恒定温度和功率控制的方式进行。 而对于 50G 间隔及 以下的光模块， 由于波长稳定度和精度控制的要求更高， 必须釆用波长锁定的 方式进行控制。 下面简单说明现有的波长锁定实现方式。
图 1所示为现有实现方式一的结构示意图。光模块中包括反馈控制器 110、 激光发射器 120和用于锁定波长的装置 130。
激光发射器 120 发出的光信号中分出一小部分光进入用于锁定波长的装 置 130,该用于锁定波长的装置 130包括波长锁定器 131和处理控制模块 132。 波长锁定器 131接收输入的光信号， 输出两路信号至处理控制模块 132, 对于 输出的两路：一路是输入信号的一个分支用作参考信号，该信号是未经处理的， 另一路是通过标准栅格比较后输出的信号。处理控制模块 132根据接收到的两 路信号的偏差， 对波长的漂移进行控制， 输出反馈信号到反馈控制器 110, 由 反馈控制器 110对激光发射器 120进行控制，使激光发射器 120的输出波长保 持稳定。反馈控制器 110具有通过控制激光管芯温度、 功率等方式控制波长偏 移等功能。
图 1所示方式虽然保证了波长稳定，但其是将用于锁定波长的装置 130至 于光模块内， 这样， 需要每个激光器单独使用一套用于锁定波长的装置 130, 从而造成了每个光模块成本的提升。 而 DWDM系统中通常会有许多光模块， 整体成本的提升是比较明显的。
图 2所示为现有实现方式二的结构示意图。该实现方式中，每个光模块中 仅包括反馈控制器和激光发射器， 如图 2中的光模块 160a到光模块 160n。 各 个光模块输出的光信号经过合波器 150合并为一条光信号输出， 经过分光器 140分出一小部分光信号引入用于锁定波长的装置 130, 该用于锁定波长的装 置 130包括波长锁定器 131、 处理控制模块 132和波长选择模块 133。 波长选 择模块 133接收分光器 140输入的光信号，根据预先的配置策略从不同波长的 光信号中选择出需要锁定的波长， 将该波长所对应的光信号送入波长锁定器 131。
之后， 波长锁定器 131输出两路信号至处理控制模块 132, 处理控制模块
132输出反馈信号至与被锁定波长相对应的光模块中的反馈控制器内， 达到控 制某个光模块内激光发射器的目的，使得该光模块输出的波长保持稳定。这部 分处理与图 1 所示相应部分的处理完全相同。 这样， 通过波长选择模块 133 依次选定各个波长的光信号， 即可实现对所有波长的选择和锁定。
图 2所示方式虽然使得多个光模块共用了一套于用于锁定波长的装置，但 该装置中需要包括一个单独的波长选择模块， 该波长选择模块的成本较高，从 实现成本看， 该方案仍然不是最优的。 而且， 由于该波长选择模块通常由机械 电子装置和光学器件构成，从一束光信号中选取波长的过程需要较长时间，机 电器件的使用次数有限， 可靠性较低。 为了满足电信设备使用年限的要求， 不 得不釆用较长的锁定间隔时间。 这样造成锁定精度的降低。
图 3所示为现有实现方式三的结构示意图。 其与图 2所示结构大致相同， 不同之处在于， 增加了低频加扰模块 170, 用于对每个光模块内的激光发射器 加一个不同频率的低频调制信号 fl ~ fn。 该调制频率一般在几十 KHz以下， 不同波长的频率间隔在 100到 ΙΚΗζ范围调制幅度 1 % ~ 5 %。 相应地， 在用 于锁定波长的装置 130中除去了波长选择模块而增加了波长提取模块。该用于 锁定波长的装置 130的处理过程是：波长锁定器 131接收分光器 140输入的光 信号， 输出两路信号至波长提取模块 134, 由波长提取模块 134进行数字信号 处理，根据不同的调制信号频率分辨出不同的波长，将待处理的波长传送给处 理控制模块 132, 处理控制模块 132根据接收到的波长判断其与标准波长的偏 移情况，输出反馈信号至与被锁定波长相对应的光模块中的反馈控制器内， 达 到控制光模块内激光发射器的目的，使得该光模块输出的波长保持稳定。这部 分处理与图 1 所示相应部分的处理完全相同。 这样， 通过波长提取模块 134 依次解调分辨各个波长， 即可实现对所有波长的选择和锁定。
对于图 3所示方式， 需要对不同的波长同时进行不同的低频调制，使得低 频加扰装置比较复杂， 需要釆用小数分频等技术实现， 而且不同扰动频率之间 的间隔比较小， 相互之间存在干扰， 对加扰信号的滤波和提取要求比较高， 造 成整个装置的复杂性提高， 波长锁定的可靠性降低。
发明内容
本发明实施例了提供了波长漂移检测装置、 波长锁定系统及其方法， 可以 降低成本、 提高锁定速度及波长锁定稳定度。
本发明实施例技术方案包括：
一种波长漂移检测装置， 该装置包括：
波长锁定模块， 用于接收复数个光模块输出并经合波后的光信号，输出两 路信号，一路是未经处理的信号，另一路是经过波长标准具对比处理后的信号； 所述两路信号中分别只有一个光信号带有标识信息；
信号处理模块， 用于接收来自所述波长锁定模块的两路信号，从每路信号 中分别提取出带有标识信息的信号，根据所述两个带有标识信息信号的功率计 算该光模块所输出光信号的波长漂移值。
一种用于锁定波长的系统， 包括光模块、 合波单元， 该系统还包括： 波长 漂移检测装置和处理控制模块， 其中，
所述波长漂移检测装置，用于接收复数个光模块输出并经合波单元合波后 的光信号， 所述两路信号中分别只有一个光信号带有标识信息； 确定所述带有 标识信息光信号的波长漂移值， 将所述漂移值传送至处理控制模块； 所述处理控制模块，用于指示复数个光模块中的一个输出带有标识信息的 光信号； 根据所述漂移值计算用于控制波长偏移的反馈信号； 将所述反馈信号 传送至带有标识信息的光信号所对应的光模块；
所述光模块， 用于接收到所述反馈信号后，根据反馈信号调整输出光信号 的波长。
一种波长漂移检测方法， 包括：
接收复数个光模块输出并经合波处理后的光信号，输出两路信号， 一路是 未经处理的光信号， 另一路是经过波长标准具对比处理后的光信号； 所述两路 信号中分别只有一个光信号带有标识信息；
从所述两路信号中分别提取出带有标识信息的信号，确定所述两个带有标 识信息信号的功率， 根据所述功率计算该光模块所输出光信号的波长漂移值。
一种用于锁定系统波长的方法， 包括：
接收经合波处理后的光信号，所述合波后的光信号是由复数个光模块输出 的， 且所述复数个光模块中只有一个光模块输出的光信号带有标识信息； 确定带有标识信息光信号的波长漂移值；
根据所述漂移值计算用于控制波长偏移的反馈信号，将所述反馈信号传送 至带有标识信息的光模块输出信号所对应的光模块；
接收到反馈信号的光模块根据所述反馈信号调整输出光信号的波长； 指示所述光模块取消输出带有标识信息的光信号后，再指示所述复数个光 模块中的另一个光模块输出带有相同标识信息的光信号， 依次锁定每个光模 块。
应用本发明实施例，令某个光模块输出带有标识信息的光信号， 确定该带 有标识信息光信号的波长与标准波长之间的漂移值；根据该漂移值输出用于控 制波长偏移的反馈信号至所述输出带有标识信息的光模块。从而达到对该光模 块的输出波长进行锁定的目的。
应用本发明实施例， 不但可以使多个光模块共用一套用于锁定波长的装 置， 不需要波长选择模块， 由于同一时间只有一个光模块输出带有标识信息的 光信号， 且不同的光模块输出带有标识信息的光信号时， 该标识信息均相同， 简化了装置的复杂度， 消除了标识信息之间的干扰， 由于不用机电装置控制波 长的切换， 降低了成本， 提高了锁定速度， 而且提高了信号处理的准确度， 从 而提升了波长锁定的精度。
附图说明
图 1是现有实现方式一的结构示意图；
图 2是现有实现方式二的结构示意图；
图 3是现有实现方式三的结构示意图；
图 4是根据本发明一实施例的结构示意图；
图 5是根据本发明另一实施例的结构示意图。
具体实施方式
下面结合附图及具体实施例对本发明再做进一步详细说明。
图 4是根据本发明一实施例的结构示意图。 该实现方式中， 每个光模块中 包括反馈控制器、 激光发射器和低频调制模块， 如图 4中的光模块 160a到光模 块 160n。 各个光模块输出的光信号经过合波单元如合波器 150合并为一条光信 号输出， 经过分光器 140分出一小部分光信号引入用于锁定波长的装置 130, 该 用于锁定波长的装置 130包括波长漂移检测装置和处理控制模块 132。波长漂移 检测装置中包括波长锁定模块 131和信号处理模块 135。
以下以控制光模块 160a为例进行说明。
波长漂移检测装置，用于接收复数个光模块输出并经合波单元合波后的光 信号，确定带有标识信息的信号所对应光模块即光模块 160a输出光信号的波长 漂移值， 将所述漂移值传送至处理控制模块 132;
处理控制模块 132 , 用于指示复数个光模块中的一个即光模块 160a输出带 有标识信息的光信号； 将接收到的所述漂移值与已设置的门限值进行比较，确 定所述漂移值大于等于所述门限值的范围时，根据所述漂移值计算用于控制波 长偏移的反馈信号；将所述反馈信号传送至带有标识信息的光信号所对应的光 模块即光模块 160a; 上述带有标识信息的信号是经过低频加扰后的信号， 或码 分加扰后的信号；
接收到反馈信号的光模块即光模块 160a根据反馈信号调整输出光信号的 波长。 上述波长漂移检测装置包括： 波长锁定模块 131以及信号处理模块 135 , 本 例中的波长锁定模块 131由波长锁定器（ wavelength locker )来实现， 该波长锁 定器是在现有市场上能够直接买到的器件。
波长锁定器（wavelength locker )用于接收复数个光模块输出并经合波后 的光信号， 分成两路信号输出， 一路是未经处理的信号， 该信号可被称为参考 信号（以下类似同）， 另一路是经过波长标准具对比处理后的信号； 其中， 复 数个光模块中只有一个光模块输出带有标识信息的光信号；
信号处理模块 135用于接收来自波长锁定器的两路信号， 从每路信号中分 别提取出带有标识信息的信号， 确定该两个带有标识信息信号的功率，根据所 述功率计算该光模块所输出光信号的波长漂移值。
波长锁定模块 131中还可以包括光电转换单元（图未示） ， 此时， 该光电 转换单元用于将所述未经处理的信号和经过波长标准具对比处理后的光信号 分别转换为电信号再输出。
在波长锁定模块 131中包括光电转换单元的情况下，信号处理模块 135内可 以包括： 标识信号提取单元和计算单元（图未示） ，
标识信号提取单元用于从每路电信号中分别提取出带有标识信息的信号； 将该带有标识信息的信号传送给计算单元；该标识信号提取单元可以是低频信 号提取单元或码分信号提取单元； 低频信号提取单元可以为低频带通滤波器， 其可以是数字滤波装置， 如 CPU或数字信号处理器（DSP ) ， 也可以是由电子 器件构成的滤波装置；
计算单元用于确定来自标识信号提取单元的两个带有标识信息信号的功 率， 才艮据所述功率计算该光模块所输出光信号的波长漂移值。
如果波长锁定模块 131中未包括光电转换单元，则信号处理模块 135中可以 包括： 光电转换单元、 标识信号提取单元和计算单元， 其中，
光电转换单元用于将接收到的两路光信号分别转换为电信号；
标识信号提取单元用于从每路电信号中分别提取出带有标识信息的信号； 将该带有标识信息的信号传送给计算单元；该标识信号提取单元可以是低频带 通滤波器， 其可以是数字滤波装置， 如 CPU或数字信号处理器（DSP ) ， 也可 以是由电子器件构成的滤波装置； 计算单元用于确定来自标识信号提取单元的两个带有标识信息信号的功 率， 才艮据所述功率计算该光模块所输出光信号的波长漂移值。
也就是说， 光电转换操作既可以由波长锁定模块 131执行， 也可以由信号 处理模块 135执行。
此外， 波长漂移检测装置内还可以包括： 合波信号选择单元， 在存在多个 合波单元时， 用于选择来自多个合波单元中的一个合波信号输入波长锁定模 块。 该合波信号选择单元可以是 Νχ ΐ光开关， 还可以是耦合器。
上述处理控制模块 132还用于指示所述接收到反馈信号的光模块即光模块 160a取消输出带有标识信息的光信号，再指示所述复数个光模块中的另一个光 模块如光模块 160b输出带有相同标识信息的光信号，这样就可实现依次锁定每 个光模块。 其中， 每一个光模块输出带有标识信息的光信号时， 所应用的标识 信息均相同。
本例中， 处理控制模块 132通过通讯与控制总线控制光模块内的低频调制 模块来指示该光模块输出经低频加扰的光信号和取消经低频加扰的光信号，通 过光模块内的反馈控制器实现对激光发射器的控制， 以达到锁定波长的目的。 该反馈控制器具有通过控制激光管芯温度、 功率等方式控制波长偏移等功能。
如上完成一轮波长锁定操作后， 开始新一轮的波长锁定操作。 强调一点， 本实施例中带有标识信息的光信号是由光模块输出的经过低频加扰的光信号， 且所有光模块的加扰频率相同， 如均釆用频率 f。 与此同时， 本发明实施例还提供了一种波长漂移检测装置， 仍参见图 4, 该波长漂移检测装置包括： 波长锁定模块和信号处理模块。
波长锁定模块用于接收复数个光模块输出并经合波后的光信号，分成两路 信号输出， 一路是未经处理的信号， 另一路是经过波长标准具对比处理后的信 号；所述复数个光模块中只有一个光模块如光模块 160a输出的光信号带有标识 信息，该带有标识信息的信号是经过低频加扰后的信号，或码分加扰后的信号； 该波长锁定模块 131可以由波长锁定器 （ wavelength locker ) 来实现； 信号处理模块用于接收来自波长锁定模块的两路信号，从每路信号中分别 提取出带有标识信息的信号，确定该两个带有标识信息信号的功率，根据所述 功率计算该光模块所输出光信号的波长漂移值。
波长锁定模块中还可以包括光电转换单元，用于将未经处理的信号和经过 波长标准具对比处理后的光信号分别转换为电信号再输出。
在波长锁定模块包括光电转换单元的情况下，信号处理模块可以包括： 标 识信号提取单元和计算单元，
标识信号提取单元， 用于从每路电信号中分别提取出带有标识信息的信 号； 将该带有标识信息的信号传送给计算单元； 该标识信号提取单元可以是低 频信号提取单元或码分信号提取单元；低频信号提取单元可以为低频带通滤波 器， 其可以是数字滤波装置， 如 CPU或数字信号处理器（DSP ) ， 也可以是由 电子器件构成的滤波装置；
计算单元用于确定来自标识信号提取单元的两个带有标识信息信号的功 率 , 才艮据该功率计算该光模块所输出光信号的波长漂移值。
如果波长锁定模块中未包括光电转换单元， 则信号处理模块中可以包括： 光电转换单元、 标识信号提取单元和计算单元。
光电转换单元用于将接收到的两路光信号分别转换为电信号；
标识信号提取单元用于从每路电信号中分别提取出带有标识信息的信号； 将该带有标识信息的信号传送给计算单元；该标识信号提取单元可以是低频信 号提取单元或码分信号提取单元； 低频信号提取单元可以为低频带通滤波器， 其可以是数字滤波装置， 如 CPU或数字信号处理器（DSP ) ， 也可以是由电子 器件构成的滤波装置。
计算单元用于确定来自标识信号提取单元的两个带有标识信息信号的功 率， 才艮据所述功率计算该光模块所输出光信号的波长漂移值。
该波长漂移检测装置还可以包括： 合波信号选择单元， 用于选择来自多个 合波单元中的一个合波单元所输出的合波信号， 输入所述波长锁定模块。
该波长漂移检测装置中的信号处理模块还可以包括输出单元，用于输出所 述漂移值。 图 5是才艮据本发明另一实施例的结构示意图， 其与图 4所示区别在于： 系统 中所有光模块共用一个位于光模块外的调制模块 180, 以达到对某个光模块的 输出信号进行加扰的目的， 其余与图 4所示实施例相同， 不再赘述。
本发明实施例还公开了一种用于锁定系统波长的方法， 包括：
a、 多个光模块中的一个输出带有标识信息的光信号。 该带有标识信息的 信号可以是经过低频加扰后的信号， 或码分加扰后的信号。
加入该标识信息的目的是为了在后续处理中能识别出某个波长的信号，从 而判断该信号的波长与标准波长相比发生了多大的偏移。 本实施例中， 光模块 中通常具备一个用于加入低频调制的接口，可以用逻辑器件产生一个特定频率 的低频信号， 并将该低频信号从该接口加入到光模块中， 这样就能对输出的光 信号加入低频扰动从而对光信号进行标识。 该低频扰动的频率可以为 1到 ΙΟΟΟΚ Ηζ, 调制的深度可以为 1 % ~5%。 可以理解， 对光模块加入低频扰动是 一种实现对光信号加入标识信息的方法，相应的，后续步骤中需要根据该特定 的标识方法提取光信号。 当然， 在其它实施例中也可以用其它方法， 只要能实 现对光信号进行标识即可。
b、 接收多个光模块输出的光信号经过合波后的信号， 确定带有标识信息 的信号所对应光模块输出光信号的波长漂移值。
由于接收到的信号是多路光信号复合而成的，无法直接用它作为波长锁定 的依据， 因此必须提取出某一个具体波长的光信号， 才能判断该光信号的波长 与标准波长的偏移量。 本实施例中， 由于在步骤 a中对某个光信号已加入了标 识信息， 这里就可以根据该标识信息提取出该波长的信号。 例如， 已对某个光 信号加入了 ΙΟΚΗζ的低频扰动， 这里， 做一个滤波处理就能将此 ΙΟΚΗζ的信号 提取出来。
上述确定带有标识信息的信号所对应光模块输出光信号的波长漂移值的 具体过程包括：
i ) 多个光模块输出的经合波后的光信号经波长锁定器处理后， 输出两路 信号， 一路是未经处理的光信号， 另一路是经过波长标准具对比处理后的光信 号； 该步骤 i ) 的操作是由波长锁定器完成的， 具体言之， 波长锁定器接收到 合波后的输入信号后， 用分光器件将该信号分为两路， 其中一路信号不作任何 处理直接输出， 不做处理直接输出的信号后续会被作为参考信号。 另一路信号 则经过波长锁定器内的波长标准具对比处理后再输出， 本实施例中， 波长锁定 器内的波长标准具为法布里一波罗标准具，该对比处理可以是将信号经过干涉 处理， 例如通过标准具（etalon )干涉器进行干涉处理， 入射光将随波长不同 相互干涉而产生不同的衰减。这样，在后续操作中通过参考信号和经过干涉器 后的信号的对比， 就能判断出输入信号的波长相对于标准波长的偏移量。在实 际应用中， 上述波长锁定器也可以由釆用介质膜滤波片的波长锁定器完成， 总 之， 本发明对具体所釆用的波长锁定器类型不做限制。
ii )将所述两路光信号分别转换为电信号， 从每路电信号中分别提取出带 有标识信息的信号，计算该两个带有标识信息信号的功率，根据功率计算该光 模块所输出光信号的波长漂移值。
根据功率计算波长漂移值的一种实现方式是：对带有标识信息的参考信号 和经过波长标准具对比处理后的信号的功率值进行除法运算后得到的一个比 值； 根据得到的功率比值， 查询预先设置功率比值与波长漂移值的对应图表， 从而确定该功率比值所对应的漂移值。 由于功率比值的具体计算过程、和功率 比值与波长漂移值对应图表的设置过程完全是现有技术， 本文不再做详细说 明。
c、 4艮据漂移值确定计算用于控制波长偏移的反馈信号； 将该反馈信号传 送至带有标识信息的光信号所对应的光模块。该反馈信号的具体计算过程也是 现有技术， 本文不再赘述。 在计算反馈信号之前， 还包括： 将漂移值与预设的 门限值进行比较， 确定所述漂移值大于等于所述门限值的范围时， 才计算用于 控制波长偏移的反馈信号。
d、 接收到反馈信号的光模块根据所述反馈信号调整输出光信号的波长； 光模块内的反馈控制器根据得到的反馈信号通过对管芯温度和功率的控制，对 波长进行微调，从而保持波长的稳定。 该对波长进行微调的过程同样是现有技 术， 不再赘述。 至此， 已完成了对多个光模块中的一个光模块所输出波长的锁定。 之后， 还可以包括：
e、 指示上述光模块取消输出带有标识信息的光信号后， 再指示多个光模 块中的另一个光模块输出带有相同标识信息的光信号， 依次锁定每个光模块。 这样， 就可以对系统中的多个光模块依次完成锁定操作。 之后， 还可以开始新 一轮波长锁定操作。
此外， 在存在多个合波单元时如合并单元 1用于对光模块 1 ~ 5所输出的光 信号进行合波，合并单元 2用于对光模块 6 ~ 15所输出的光信号进行合波，合并 单元 3用于对光模块 16 ~ 21所输出的光信号进行合波，则上述方法还可以包括： 选择来自多个合波单元中的一个合波信号输入用于波长锁定装置进行波长锁 定操作。 也就是说， 如果将一个合波单元及其后的光模块看做一组， 则可以选 择某一组进行波长锁定。
本实施例中，上述带有标识信息的光信号是由光模块输出的经过低频加扰 的光信号， 且所有光模块的加扰频率相同， 如均釆用频率 f。 当带有标识信息 的信号是经过低频加扰后的信号时，所述提取出带有标识信息的信号的过程是 通过低频带通滤波完成的。
本实施例中， 上述低频加扰由调制模块完成， 该调制模块可以位于各个光 模块内， 也可以是系统中所有光模块共用一个位于光模块外的调制模块。
本发明实施例还提供了一种波长漂移检测方法， 包括：
接收多个光模块输出的经合波后的光信号，输出两路信号， 一路是未经处 理的光信号， 另一路是经过波长标准具对比处理后的光信号；
将所述两路光信号分别转换为电信号，从每路电信号中分别提取出带有标 识信息的信号，确定该两个带有标识信息信号的功率，根据所述功率计算该光 模块所输出光信号的波长漂移值。
上述方法还可以包括：选择来自多个合波单元中的一个合波信号进行波长 锁定操作。
上述方法还可以包括： 输出所述波长漂移值。 上述带有标识信息的信号是经过低频加扰后的信号， 或码分加扰后的信 号。 当所述带有标识信息的信号是经过低频加扰后的信号时， 所述提取出带有 标识信息的信号的过程是通过低频带通滤波完成的。
可见，由于本发明实施例中可以使多个光模块共用一套用于锁定波长的装 置， 不需要对光信号的波长实施选择的波长选择模块， 而且带有标识信息的光 信号可以通过加扰的方式实现， 同一时间只有一个光模块的输出信号被加扰， 且不同的光模块输出带有标识信息的光信号时， 该标识信息均相同，如针对每 个光信号的加扰釆用相同的频率， 因而简化了加扰装置的复杂度， 消除了加扰 信号之间的干扰， 降低了成本， 提高了锁定速度， 而且提高了信号处理的准确 度， 从而提升了波长锁定的精度。
以上所述仅为本发明的较佳实施例而已， 并非用于限定本发明的保护范 围。 凡在本发明的精神和原则之内所作的任何修改、 等同替换、 改进等， 均包 含在本发明的保护范围内。

Claims

权 利 要 求
1、 一种波长漂移检测装置， 其特征在于， 该装置包括：
波长锁定模块， 用于接收复数个光模块输出并经合波后的光信号，输出两 路信号，一路是未经处理的信号，另一路是经过波长标准具对比处理后的信号； 所述两路信号中分别只有一个光信号带有标识信息；
信号处理模块， 用于接收来自所述波长锁定模块的两路信号，从每路信号 中分别提取出带有标识信息的信号，根据所述两个带有标识信息信号的功率计 算该光模块所输出光信号的波长漂移值。
2、 根据权利要求 1所述的波长漂移检测装置， 其特征在于，
波长锁定模块中还包括光电转换单元，用于将所述未经处理的信号和经过 波长标准具对比处理后的光信号分别转换为电信号再输出；
所述信号处理模块包括： 标识信号提取单元和计算单元，
所述标识信号提取单元，用于从每路电信号中分别提取出带有标识信息的 信号； 将该带有标识信息的信号传送给计算单元；
所述计算单元，用于确定来自标识信号提取单元的所述两个带有标识信息 信号的功率， 根据所述功率计算该光模块所输出光信号的波长漂移值。
3、 根据权利要求 1所述的波长漂移检测装置， 其特征在于， 所述信号处 理模块包括： 光电转换单元、 标识信号提取单元和计算单元， 其中，
所述光电转换单元， 用于将接收到的两路光信号分别转换为电信号； 所述标识信号提取单元，用于从每路电信号中分别提取出带有标识信息的 信号； 将该带有标识信息的信号传送给计算单元；
所述计算单元，用于确定来自标识提取单元的所述两个带有标识信息信号 的功率， 才艮据所述功率计算该光模块所输出光信号的波长漂移值。
4、 根据权利要求 2或 3所述的波长漂移检测装置， 其特征在于， 所述标 识信号提取单元包括低频信号提取单元， 码分信号提取单元；
所述低频信号提取单元包括低频带通滤波器。
5、 根据权利要求 1所述的波长漂移检测装置， 其特征在于， 该装置还包 括： 合波信号选择单元， 用于选择来自多个合波单元中的一个合波单元所输出 的合波信号， 输入所述波长锁定模块。
6、 根据权利要求 1、 2、 3或 5所述的波长漂移检测装置， 其特征在于， 所述带有标识信息的信号是经过低频加扰后的信号， 或码分加扰后的信号。
7、 一种用于锁定波长的系统， 包括光模块、 合波单元， 其特征在于， 该 系统还包括： 波长漂移检测装置和处理控制模块， 其中，
所述波长漂移检测装置，用于接收复数个光模块输出并经合波单元合波后 的光信号， 所述两路信号中分别只有一个光信号带有标识信息； 确定所述带有 标识信息光信号的波长漂移值 , 将所述漂移值传送至处理控制模块；
所述处理控制模块，用于指示复数个光模块中的一个输出带有标识信息的 光信号； 根据所述漂移值计算用于控制波长偏移的反馈信号； 将所述反馈信号 传送至带有标识信息的光信号所对应的光模块；
所述光模块， 用于接收到所述反馈信号后，根据反馈信号调整输出光信号 的波长。
8、 根据权利要求 7所述的系统， 其特征在于， 所述波长漂移检测装置包 括：
波长锁定模块， 用于接收复数个光模块输出并经合波后的光信号，输出两 路信号，一路是未经处理的信号，另一路是经过波长标准具对比处理后的信号； 所述两路信号中分别只有一个光信号带有标识信息；
信号处理模块， 用于接收来自所述波长锁定模块的两路信号，从每路信号 中分别提取出带有标识信息的信号，确定该两个带有标识信息信号的功率，根 据所述功率计算该光模块所输出光信号的波长漂移值。
9、 根据权利要求 8所述的系统， 其特征在于， 所述波长漂移检测装置还 包括： 合波信号选择单元， 用于选择来自多个合波单元中的一个合波信号输入 所述波长锁定器。
10、 根据权利要求 7所述的系统， 其特征在于， 所述处理控制模块还用于 指示所述接收到反馈信号的光模块取消输出带有标识信息的光信号，再指示所 述复数个光模块中的另一个光模块输出带有相同标识信息的光信号。
11、 一种波长漂移检测方法， 其特征在于， 包括：
接收复数个光模块输出并经合波处理后的光信号， 输出两路信号， 一路是 未经处理的光信号， 另一路是经过波长标准具对比处理后的光信号； 所述两路 信号中分别只有一个光信号带有标识信息；
从所述两路光信号中分别提取出带有标识信息的信号， 确定所述两个带有 标识信息信号的功率，根据所述功率计算该光模块所输出光信号的波长漂移值。
12、 根据权利要求 11所述的方法， 其特征在于， 该方法还包括： 选择来 自多个合波单元中的一个合波信号进行波长锁定操作。
13、 根据权利要求 11所述的方法， 其特征在于， 所述带有标识信息的信 号是经过低频加扰后的信号， 或码分加扰后的信号。
14、 一种用于锁定系统波长的方法， 其特征在于， 包括：
接收经合波处理后的光信号，所述合波后的光信号是由复数个光模块输出 的， 且所述复数个光模块中只有一个光模块输出的光信号带有标识信息；
确定带有标识信息光信号的波长漂移值；
根据所述漂移值计算用于控制波长偏移的反馈信号，将所述反馈信号传送 至带有标识信息的光信号所对应的光模块；
接收到反馈信号的光模块根据所述反馈信号调整输出光信号的波长； 指示所述光模块取消输出带有标识信息的光信号后， 再指示所述复数个光 模块中的另一个光模块输出带有相同标识信息的光信号，依次锁定每个光模块。
15、 根据权利要求 14所述的方法， 其特征在于， 计算用于控制波长偏移 的反馈信号之前还包括：
将所述漂移值与预设的门限值进行比较，确定所述漂移值大于等于所述门 限值的范围时， 再计算用于控制波长偏移的反馈信号。
16、 根据权利要求 14所述的方法， 其特征在于， 所述接收复数个光模块 输出并经合波后的光信号 , 确定带有标识信息光信号的波长漂移值过程包括： 复数个光模块输出并经合波后的光信号经波长锁定器处理后，输出两路信 号， 一路是未经处理的信号， 另一路是经过波长标准具对比处理后的光信号； 将所述两路光信号分别转换为电信号，从每路电信号中分别提取出带有标 识信息的信号，确定所述两个带有标识信息信号的功率，根据所述功率计算该 光模块所输出光信号的波长漂移值。
17、 根据权利要求 14所述的方法， 其特征在于， 该方法还包括： 选择来 自多个合波单元中的一个合波信号进行波长锁定操作。
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CN101247199A (zh) 2008-08-20
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US20090232493A1 (en) 2009-09-17
US8190033B2 (en) 2012-05-29

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