KR20030083355A - Restraining method of noise floor increase by applying an acousto-optical effect for optical transmission - Google Patents

Restraining method of noise floor increase by applying an acousto-optical effect for optical transmission Download PDF

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KR20030083355A
KR20030083355A KR1020020021858A KR20020021858A KR20030083355A KR 20030083355 A KR20030083355 A KR 20030083355A KR 1020020021858 A KR1020020021858 A KR 1020020021858A KR 20020021858 A KR20020021858 A KR 20020021858A KR 20030083355 A KR20030083355 A KR 20030083355A
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optical
voltage
high frequency
signal
applying
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KR1020020021858A
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김동혁
박찬준
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(주)애니람다
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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
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
    • 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)
  • Semiconductor Lasers (AREA)
  • Optical Communication System (AREA)

Abstract

PURPOSE: A method for suppressing an increase of a noise floor by applying an acousto-optical effect during an optical transmission is provided to transmit light by giving the acousto-optical effect, and to suppress SBS(Stimulated Brillouin Scattering), thereby improving speech quality. CONSTITUTION: A system performs a voltage drop via a resistor(R1) in order to adjust a DC voltage to a bias voltage of an LD(Laser Diode). The system applies a low frequency signal less than 1MHz to the DC voltage whose voltage is dropped via a condenser(C1). The system cuts off a high frequency component via a high frequency RF cut-off inductor(L1). The system forwardly applies the voltage whose high frequency is cut off to the LD in order to bias the LD. The system modulates a high frequency RF signal applied through a connector(J1) to an optical signal outputted from the LD via a condenser(C2). The system cuts off a high frequency component of the modulated signal, and transmits light.

Description

광전송시 어커스토-옵틱 효과를 적용하여 노이즈 플로어 증가를 억제하는 방법 {Restraining method of noise floor increase by applying an acousto-optical effect for optical transmission}Restraining method of noise floor increase by applying an acousto-optical effect for optical transmission}

본 발명은 광전송용 레이저 다이오드(Laser Diode)와, 광수신용 수광 다이오드(Photo Diode)와, 파장분기소자(Wavelength Division Multiplexer)를 포함하여 이루어지는 전광/광전 컨버터(Electrical-Optical/Optical-Electrical Converter)를 통해 신호를 송수신하는 방법중 광신호의 장거리 전송시 노이즈 플로어 증가를 억제하기 위한 방법에 관한 것이다.The present invention relates to an electrical-optical / optical-electrical converter including a laser diode for transmitting light, a photodiode for receiving light, and a wavelength division multiplexer. The present invention relates to a method for suppressing an increase in a noise floor during a long distance transmission of an optical signal.

종래의 전광/광전 컨버터를 통해 장거리 광신호 전송을 하는 경우 노이즈 레벨이 상승하므로 레이저 다이오드의 출력에 아이솔레이터를 삽입하여 노이즈 레벨의 상승을 억제 할수 있지만 가격이 비싸며 삽입손실이 생기므로 적용을 하기가 쉽지가 않았다.When the long-distance optical signal is transmitted through the conventional all-optical / optoelectric converter, the noise level rises, so it is possible to suppress the rise of the noise level by inserting an isolator at the output of the laser diode. Did.

본 발명의 목적은 상기와 같은 종래의 전광/광전 컨버터를 통해 장거리 광신호를 전송하는 경우 발생되었던 노이즈 플로어 상승 문제를 최소화 할 수 있는 방법을 제시하는데 있다.An object of the present invention is to provide a method for minimizing the noise floor rise problem that occurred when transmitting a long-distance optical signal through the conventional all-optical / photoelectric converter as described above.

도 1 은 종래의 광송수신용 전광/광전 컨버터 모듈의 구성도이다.1 is a block diagram of a conventional all-optical / optoelectric converter module for optical transmission and reception.

도 2 는 상기 종래 전광/광전 컨버터 모듈의 신호특성 출력파형이다.2 is a signal characteristic output waveform of the conventional all-optical photoelectric converter module.

도 3 은 본 발명에 의한 광송수신용 전광/광전 컨버터 모듈의 구성도이다.3 is a block diagram of an all-optical photoelectric converter module for optical transmission and reception according to the present invention.

도 4 는 본 발명에 의한 전광/광전 컨버터 모듈의 신호특성 출력파형이다.4 is a signal characteristic output waveform of the all-opto photoelectric converter module according to the present invention.

본 발명은 광전송용 레이저 다이오드와, 광수신용 수광 다이오드와, 파장분기소자를 포함하여 이루어지는 전광/광전 컨버터를 통해 신호를 송수신하는 방법중 광신호의 장거리 전송시 노이즈 레벨의 상승을 억제하기 위한 방법에 관한 것이다.The present invention relates to a method for suppressing an increase in noise level during a long distance transmission of an optical signal in a method of transmitting and receiving a signal through an all-optical / photoelectric converter including a laser diode for optical transmission, a light receiving diode for optical reception, and a wavelength branching element. It is about.

즉, 광신호의 장거리 전송시 노이즈 레벨의 상승을 최소화하기 위해 상기 레이저 다이오드에 1MHz 이하의 주파수 신호를 직류 바이어스에 혼합하여 인가함으로서 어커스토-옵틱 효과(Acousto-optical Effect)를 주어 전송함으로서 장거리 전송시 발생하는 SBS(Stimulated Brillouin Scattering)로 인해 노이즈 플로어(Noise Floor)상승을 억제하는 효과 및 IMD의 떨림 효과를 최소화 할수 있다.In other words, in order to minimize the increase in noise level during the long-distance transmission of the optical signal, a frequency signal of 1 MHz or less is applied to the laser diode mixed with a direct current bias to give an acousto-optical effect and transmit the long-distance. Due to the SBS (Stimulated Brillouin Scattering) generated during transmission, it is possible to minimize the effect of suppressing the rise of the noise floor and the shaking effect of the IMD.

이때, 상기 저주파 신호를 직류 바이어스에 실어주는 단계는, 고주파 RF 신호가 입력되어 DC 블록킹 콘덴서를 통과해 레이저 다이오드의 캐소드(Cathode) 혹은 애노드(Anode)에 입력되는 단계와, 1MHz이하의 저주파수를 콘덴서를 통해 직류성분에 포함되어 레이저 다이오드를 바이어스 하여 광을 출력하는 단계를 포함하여 이루어지는 것이 바람직하다.In this case, the step of loading the low-frequency signal to the DC bias, the high-frequency RF signal is input through the DC blocking capacitor is input to the cathode (Cathode) or anode (Anode) of the laser diode, and the low frequency of less than 1MHz capacitor It is preferably made to include the step of outputting light by biasing the laser diode included in the DC component.

이하 도면을 참조하여 본 발명의 구성 및 효과에 대해 상세히 설명한다.Hereinafter, the configuration and effects of the present invention will be described in detail with reference to the accompanying drawings.

먼저, 도 1 은 종래의 광송수신용 전광/광전 컨버터 모듈의 구성도이며, 도 2 는 상기 종래 전광/광전 컨버터 모듈의 신호출력 파형이다.First, FIG. 1 is a block diagram of a conventional all-optical / photoelectric converter module for optical transmission and reception, and FIG. 2 is a signal output waveform of the conventional all-optical / photoelectric converter module.

상기 신호출력 파형은 외부 신호발생기(Signal Generator)로부터 출력된 신호를 전광/광전 컨버터 모듈의 송신부에 입력한 후 수신부로 출력된 신호를 스펙트럼 분석기(Spectrum Analyzer)로 출력한 파형이다.The signal output waveform is a waveform obtained by inputting a signal output from an external signal generator to a transmitter of an all-optical / optoelectric converter module and then outputting a signal output to a receiver to a spectrum analyzer.

위의 그림은 송신부와 수신부를 3미터 점퍼(Jumper)로 연결한 후 노이즈 레벨(Noise Level)의 변화를 출력한 것으로, 겹쳐지는 2개의 상(象)중 아래의 레벨은 일반적인 출력 파형이며 위의 레벨은 1분정도 시간동안 MAX HOLD(시간이 지남에 따라 제일 높은 레벨의 점들만 모인 선) 시켜서 올라간 선이다. 아래의 그림은 송신부와 수신부를 15Km 길이의 Spool로 연결한 후 측정한 값인데 동일하게 MAX HOLD 시켜서 측정하였으며 위의 그림에 비해 노이즈 레벨의 상승폭이 상대적으로 크고, 스푸리우스(Spurious)성분이 많이 발생하는 것을 알 수 있다.The figure above shows the change of noise level after connecting transmitter and receiver with 3 meter jumper. The lower level of the two overlapping images is the general output waveform. The level is raised by MAX HOLD for a minute, which is the line that collects only the highest level points over time. The figure below is measured after connecting the transmitter and receiver with 15Km spool, and it is measured by MAX HOLD. The rise of the noise level is relatively higher than that of the above figure, and the spurious component is generated a lot. I can see that.

이와 같은 노이즈 레벨의 상승은 시스템에서 신호대 잡음비(SNR:Signal toNoise Ratio)가 저하되어 결국 통화 품질을 저하시키는 주된 원인이 된다.This increase in noise level is a major cause of poor signal-to-noise ratio (SNR) in the system, which in turn degrades the call quality.

다음으로, 도 3 은 본 발명에 의한 광송수신용 전광/광전 컨버터 모듈의 구성도이며, 도 4 는 본 발명에 의해 어커스토-옵틱 효과(Acousto-optical Effect)가 적용된 모듈의 신호특성 출력 파형이다.Next, FIG. 3 is a configuration diagram of an all-optical / optoelectric converter module for optical transmission and reception according to the present invention, and FIG. 4 is a signal characteristic output waveform of a module to which the Acousto-optical Effect is applied according to the present invention. to be.

도 4 는 특성 비교를 위해 송신부와 수신부를 15Km 길이의 Spool로 연결하여 본 발명에 의한 어커스토-옵틱 효과를 적용하여 스캐터링 노이즈(Scattering Noise)를 제거하고 측정한 파형으로, 노이즈 플로어(Noise Floor)의 상승분이나, 스푸리우스(spurious) 증가분이 어커스토-옵틱 효과(Acousto-optical Effect)를 적용하지 않은 것에 비해 아주 적음을 알 수있다.4 is a waveform measured by removing scattering noise by applying the austo-optic effect according to the present invention by connecting a transmitter and a receiver to a 15Km spool for comparing characteristics, and a noise floor. It can be seen that the rise of the floor or the spurious increase is very small compared to the absence of the Acousto-optical Effect.

아울러, 도 3 을 통해 본 발명에 의한 광전송 방법을 보다 상세히 설명하면 다음과 같다.In addition, the optical transmission method according to the present invention in detail with reference to FIG. 3 as follows.

즉, 본 발명은 광전송용 레이저 다이오드(Laser Diode)와, 광수신용 수광 다이오드(Photo Diode)와, 파장분기소자(Wavelength Division Multiplexer)를 포함하여 이루어지는 전광/광전 컨버터(Electrical-Optical/Optical-Electrical Converter)를 적용하여 광 중계기를 운용하는 방법에 있어서 광신호의 장거리 전송시 발생하는 노이즈 플로어의 증가를 억제하기 위한 광전송 방법으로,That is, the present invention includes an optical-optical / optical-electrical converter including a laser diode for transmitting light, a photodiode for receiving light, and a wavelength division multiplexer. In the method of operating the optical repeater by applying a), an optical transmission method for suppressing the increase of the noise floor generated during the long-distance transmission of the optical signal,

외부로부터 인가된 직류 인가전압을 상기 레이저 다이오드의 바이어스 전압으로 맞추기 위해 저항(R1)을 거쳐 전압강하를 시키는 단계와,Performing a voltage drop through a resistor (R1) to adjust a DC applied voltage applied from the outside to a bias voltage of the laser diode;

직류성분 차단용 콘덴서(C1)를 거쳐 1MHz 이하의 저주파 신호를 상기 전압강하된 직류 전압에 인가하는 단계와,Applying a low frequency signal of 1 MHz or less to the voltage dropping DC voltage through a DC component blocking capacitor C1;

상기 인가된 저주파 신호와 전압강하된 직류 전압을 고주파 RF 차단용 인덕터(L1)를 거쳐 고주파 성분을 차단시키는 단계와,Blocking the applied low frequency signal and the voltage dropping DC voltage through a high frequency RF blocking inductor (L1) to block high frequency components;

레이저 다이오드를 바이어스 시키기 위해 상기 고주파 성분이 차단된 전압을 레이저 다이오드에 순방향으로 인가하는 단계와,Applying a voltage in which the high frequency component is cut off in a forward direction to bias the laser diode,

커넥터(J1)를 통해 외부로부터 인가된 고주파 RF 신호를 직류성분 차단용 콘덴서(C2)를 거친 후 상기 레이저 다이오드로부터 출력된 광신호에 변조시키는 단계 및Modulating the high frequency RF signal applied from the outside through the connector J1 to the optical signal outputted from the laser diode after passing through the DC component blocking capacitor C2; and

고주파 RF 차단용 인덕터(L1)를 거쳐 상기 변조된 신호의 고주파 성분을 차단시킨 후 외부로 광전송하는 단계를 포함하여 이루어진다.And cutting the high frequency components of the modulated signal through the high frequency RF blocking inductor L1 and optically transmitting them to the outside.

광모듈을 통해 광신호의 장거리 전송시 SBS로 인해 증가하는 노이즈 플로어의 상승을 억제시켜 광전송을 하는 방법으로서, 어커스토-옵틱 효과(Acousto-optical Effect)를 적용하여 광을 전송함으로서 동일한 비용으로 신호 대 잡음비를 크게 하여 통화 품질을 향상시킬 수 있을 뿐 아니라 20Km이상의 망 설계를 가능하게 하며 더 넓은 Coverage를 확보할 수 있는 장점이 있다.It is a method of optical transmission by suppressing the increase of the noise floor which is increased due to SBS in the long distance transmission of the optical signal through the optical module, by applying the acoustic-optical effect to transmit the light at the same cost Not only can the signal quality be improved by increasing the signal-to-noise ratio, but also the network design of 20Km or more is possible and the broad coverage can be secured.

Claims (1)

광전송용 레이저 다이오드(Laser Diode)와, 광수신용 수광 다이오드(Photo Diode)와, 파장분기소자(Wavelength Division Multiplexer)를 포함하여 이루어지는 전광/광전 컨버터(Electrical-Optical/Optical-Electrical Converter)를 적용하여 광 중계기를 운용하는 방법에 있어서,Optical-optical / optical-electrical converters, which include a laser diode for transmitting light, a photodiode for receiving light, and a wavelength division multiplexer, are applied. In the method of operating a repeater, 광신호의 장거리 전송시 발생하는 노이즈 플로어의 증가를 억제하기 위해To suppress an increase in the noise floor generated during long-distance transmission of optical signals 외부로부터 인가된 직류 인가전압을 상기 레이저 다이오드의 바이어스 전압으로 맞추기 위해 저항(R1)을 거쳐 전압강하를 시키는 단계;와Voltage drop across the resistor (R1) to adjust the DC applied voltage applied from the outside to the bias voltage of the laser diode; and 직류성분 차단용 콘덴서(C1)를 거쳐 1MHz 이하의 저주파 신호를 상기 전압강하된 직류 전압에 인가하는 단계;Applying a low frequency signal of 1 MHz or less to the voltage-falling DC voltage through a DC component blocking capacitor C1; 상기 인가된 저주파 신호와 전압강하된 직류 전압을 고주파 RF 차단용 인덕터(L1)를 거쳐 고주파 성분을 차단시키는 단계;Cutting off the high frequency component from the applied low frequency signal and the voltage dropping DC voltage through a high frequency RF blocking inductor (L1); 레이저 다이오드를 바이어스 시키기 위해 상기 고주파 성분이 차단된 전압을 레이저 다이오드에 순방향으로 인가하는 단계;Forwardly applying a voltage at which the high frequency component is cut off to bias the laser diode; 커넥터(J1)를 통해 외부로부터 인가된 고주파 RF 신호를 직류성분 차단용 콘덴서(C2)를 거친 후 상기 레이저 다이오드로부터 출력된 광신호에 변조시키는 단계; 및Modulating the high frequency RF signal applied from the outside through the connector J1 to the optical signal output from the laser diode after passing through the DC component blocking capacitor C2; And 고주파 RF 차단용 인덕터(L1)를 거쳐 상기 변조된 신호의 고주파 성분을 차단시킨 후 외부로 광전송하는 단계를 포함하여 이루어지는, 광전송시 어커스토-옵틱 효과(Acousto-optical Effect)를 적용하여 노이즈 플로어 증가를 억제하는 방법.Blocking the high-frequency components of the modulated signal via a high-frequency RF inductor (L1) and then optically transmitting to the outside, noise floor by applying the acoustic-optical effect during optical transmission How to suppress the increase.
KR1020020021858A 2002-04-22 2002-04-22 Restraining method of noise floor increase by applying an acousto-optical effect for optical transmission KR20030083355A (en)

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US5373385A (en) * 1993-11-12 1994-12-13 At&T Corp. Method and apparatus for reduction of optical communication system impairments
US5430569A (en) * 1992-05-22 1995-07-04 Ortel Corporation Suppression of noise and distortion in fiber-optic systems
US5572612A (en) * 1994-12-14 1996-11-05 Lucent Technologies Inc. Bidirectional optical transmission system
KR20020096079A (en) * 2001-06-15 2002-12-31 주식회사 에치에프알 Method and apparatus for suppressing the influence of impulse noise for use in an optical transmitter module
KR20030066993A (en) * 2002-02-06 2003-08-14 삼성전자주식회사 apparatus for suppression of Stimulated Brillouin Scattering in optical transmitter

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5430569A (en) * 1992-05-22 1995-07-04 Ortel Corporation Suppression of noise and distortion in fiber-optic systems
US5453868A (en) * 1992-05-22 1995-09-26 Ortel Corporation Suppression of noise and distortion in fiber-optic systems
US5373385A (en) * 1993-11-12 1994-12-13 At&T Corp. Method and apparatus for reduction of optical communication system impairments
US5572612A (en) * 1994-12-14 1996-11-05 Lucent Technologies Inc. Bidirectional optical transmission system
KR20020096079A (en) * 2001-06-15 2002-12-31 주식회사 에치에프알 Method and apparatus for suppressing the influence of impulse noise for use in an optical transmitter module
KR20030066993A (en) * 2002-02-06 2003-08-14 삼성전자주식회사 apparatus for suppression of Stimulated Brillouin Scattering in optical transmitter

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