JPH07183871A - Wavelength multiplexed optical communication system - Google Patents
Wavelength multiplexed optical communication systemInfo
- Publication number
- JPH07183871A JPH07183871A JP5328652A JP32865293A JPH07183871A JP H07183871 A JPH07183871 A JP H07183871A JP 5328652 A JP5328652 A JP 5328652A JP 32865293 A JP32865293 A JP 32865293A JP H07183871 A JPH07183871 A JP H07183871A
- Authority
- JP
- Japan
- Prior art keywords
- optical
- signal
- amplifier
- control signal
- monitoring control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Optical Communication System (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、光通信に利用する。本
発明は、複数個の光波長を用いた波長多重伝送の監視制
御方式に関する。特に、伝送距離を延ばすために光ファ
イバ増幅器を適用した波長多重伝送システムの監視制御
方式に関する。The present invention is used in optical communication. The present invention relates to a supervisory control system for wavelength division multiplex transmission using a plurality of optical wavelengths. In particular, it relates to a supervisory control method for a wavelength division multiplex transmission system to which an optical fiber amplifier is applied in order to extend the transmission distance.
【０００２】[0002]
【従来の技術】従来、この種の２波狭帯域波長多重伝送
システムにおける光送受信装置は一般的に図２に示すよ
うに構成される。この例では、光送信装置１１′側で、
第一の光送信盤１が波長λ1 の光信号に監視制御信号発
生器９から発生される周波数ｆｓ１の監視制御信号を付
加して出力し、同時に第二の光送信盤２が監視制御信号
発生器１０から発生される周波数ｆｓ２の監視制御信号
を付加して出力する。出力された２系統の光信号を光カ
ップラ３によって合成し、光増幅器４で増幅して光ファ
イバ８に送出する。2. Description of the Related Art Conventionally, an optical transmitter / receiver in a two-wave narrowband wavelength division multiplex transmission system of this type is generally constructed as shown in FIG. In this example, on the optical transmitter 11 'side,
The first optical transmission board 1 adds the supervisory control signal of the frequency fs1 generated from the supervisory control signal generator 9 to the optical signal of the wavelength λ 1 and outputs it, and at the same time, the second optical transmission board 2 outputs the supervisory control signal. The monitor control signal of the frequency fs2 generated from the generator 10 is added and output. The output optical signals of the two systems are combined by the optical coupler 3, amplified by the optical amplifier 4, and sent to the optical fiber 8.
【０００３】この光ファイバ８からの光信号を光受信装
置１２′が受信し、個々の波長に応じた通過域を有する
ＷＤＭ（波長分割多重）フィルタ５が個々の波長成分に
分離する。分離された光信号は第一の光受信盤６および
第二の光受信盤７に入力して電気信号に変換される。An optical signal from the optical fiber 8 is received by an optical receiver 12 ', and a WDM (wavelength division multiplex) filter 5 having a pass band corresponding to each wavelength separates it into individual wavelength components. The separated optical signal is input to the first optical receiving board 6 and the second optical receiving board 7 and converted into an electric signal.
【０００４】このように従来方式では、第一の光送信盤
１および第二の光送信盤２にそれぞれ異なるキャリア周
波数（ｆｓ１、ｆｓ２）を用いて監視制御信号を伝送
し、光受信装置１２′でそれぞれの監視制御信号に復調
してシステムの状態が監視されている。As described above, in the conventional method, the supervisory control signal is transmitted to the first optical transmission board 1 and the second optical transmission board 2 by using different carrier frequencies (fs1, fs2), and the optical receiving device 12 'is used. The status of the system is monitored by demodulating each monitor control signal.
【０００５】監視制御信号を主信号に重畳して伝送する
方式としては、特開昭５８─２２１５３４号公報に開示
されたものがあるが、これは、現用システムの主信号に
打合せ信号を重畳させ、予備システムの主信号に監視制
御信号を重畳させて伝送することにより、フレーム構成
を基本的に変更することなく、介在対を要せずに通信を
行えるようにしたものである。As a method for transmitting the supervisory control signal by superimposing it on the main signal, there is one disclosed in Japanese Patent Laid-Open No. 221534/1983, which is a method for superimposing a meeting signal on the main signal of the current system. By superimposing and transmitting a supervisory control signal on the main signal of the backup system, communication can be performed without basically changing the frame structure and without requiring an intervening pair.
【０００６】また、特開平２─２２３２３７号公報に開
示された光海底中継器があるが、これは、各中継器毎に
異なる周波数の監視信号をＰＣＭ信号に重畳して送出
し、端局でインサービスの状態のまま監視信号を周波数
軸上に配列して各中継器を監視し、コマンド信号を不要
にして伝達送信への干渉問題を解決するものである。Further, there is an optical submarine repeater disclosed in Japanese Patent Laid-Open No. 223237/1990, which is a terminal station that superimposes a supervisory signal of a frequency different for each repeater on a PCM signal and sends it. The monitoring signal is arranged on the frequency axis in an in-service state to monitor each repeater, and the command signal is made unnecessary to solve the problem of interference with transmission and transmission.
【０００７】[0007]
【発明が解決しようとする課題】このように従来の２波
狭帯域波長多重伝送システムでは、システムの監視のた
めに個々の光送信盤ごとに異なるキャリア周波数を用い
て監視制御信号を重畳し受信装置で復調する構成となっ
ている。As described above, in the conventional two-wave narrowband wavelength division multiplexing transmission system, the supervisory control signal is superposed and received by using a different carrier frequency for each optical transmission board for system monitoring. The device is configured to demodulate.
【０００８】近年、光ファイバ増幅器の開発により中継
距離の長距離化が志向されていて、波長多重伝送システ
ムについても、合波、分波にともなう損失補償と併せて
送信盤出力パワーの増加により、従来の標準中継距離
（波長１．５５μｍのシステムで８０ｋｍ程度）の２倍
から３倍の中継距離を目指したシステムが検討されてい
る。このようなシステムでは、上述したような理由によ
り光ファイバ増幅器を適用することが不可欠である。し
かしながら、一般に光ファイバ増幅器は、光ファイバ増
幅器からの出力パワーをモニターして、入力パワーのあ
る範囲内で一定の出力パワーが得られるように励起光源
のパワーを変化して、結果として増幅器出力を一定にす
る制御がかけられている。In recent years, the development of optical fiber amplifiers has been aimed at increasing the relay distance, and also in a wavelength division multiplexing transmission system, due to the increase in the output power of the transmission board together with the loss compensation accompanying the multiplexing and demultiplexing. A system aiming at a relay distance that is two to three times the conventional standard relay distance (about 80 km for a system with a wavelength of 1.55 μm) is being studied. In such a system, it is indispensable to apply the optical fiber amplifier for the above-mentioned reasons. However, in general, the optical fiber amplifier monitors the output power from the optical fiber amplifier and changes the power of the pumping light source so as to obtain a constant output power within a certain range of the input power, and as a result, the amplifier output is changed. It is controlled to be constant.
【０００９】一方、光ファイバ増幅器は、その利得が波
長特性を有しており、波長多重した信号光を入力した場
合、光ファイバ増幅器の利得競合が発生し、同一入力パ
ワーに対して出力パワーにレベル差を生じさせる問題が
ある。監視制御信号としては、低周波のキャリアにＡＭ
変調をかけて主信号に重畳する方式が一般に使用されて
いるが、上述した光ファイバ増幅器の利得競合が発生し
た場合は、個々の監視制御信号間で混変調を受けるため
監視制御信号の伝送が難しくなる問題がある。本発明は
このような問題を解決するもので、光ファイバ増幅器の
利得競合が発生しても、個々の監視制御信号間で混変調
を受けることなく監視制御信号を伝送し、２チャンネル
同時に監視制御を行うことができる方式を提供すること
を目的とする。On the other hand, the gain of the optical fiber amplifier has a wavelength characteristic, and when the wavelength-multiplexed signal light is input, the gain competition of the optical fiber amplifier occurs, and the output power is changed to the same input power. There is a problem that causes a level difference. AM is used as a supervisory control signal for low-frequency carriers.
The method of modulating and superimposing on the main signal is generally used, but when the above-mentioned gain competition of the optical fiber amplifier occurs, the supervisory control signal is transmitted because intermodulation occurs between the individual supervisory control signals. There is a problem that becomes difficult. The present invention solves such a problem. Even if gain competition of the optical fiber amplifier occurs, the supervisory control signal is transmitted without being subjected to intermodulation between the individual supervisory control signals, and the supervisory control is simultaneously performed on the two channels. It is intended to provide a method capable of performing.
【００１０】[0010]
【課題を解決するための手段】本発明は、互いに波長の
異なる二つの光信号（λ1 、λ2 ）を多重し光増幅器
（４）で増幅して光ファイバ（８）に送出する光送信装
置と、この光ファイバ（８）に到来する光信号を二つの
波長に分離して受信する光受信装置とを備えた波長多重
光通信方式において、前記光送信装置では、二つの光信
号（λ1 、λ2 ）の一方を前記増幅器（４）の入力側で
監視周波数信号により振幅変調する手段を備え、前記光
受信装置には、前記光ファイバ（８）に到来する二つの
波長の光信号のそれぞれについて振幅変調された前記監
視周波数信号を復調する復調回路を備えたことを特徴と
する。DISCLOSURE OF THE INVENTION According to the present invention, an optical transmission in which two optical signals (λ 1 , λ 2 ) having different wavelengths are multiplexed, amplified by an optical amplifier (4) and sent to an optical fiber (8). In a wavelength division multiplexing optical communication system comprising a device and an optical receiving device that receives an optical signal that arrives at this optical fiber (8) by separating it into two wavelengths, in the optical transmitting device, two optical signals (λ 1 , λ 2 ) is provided on the input side of the amplifier (4) for amplitude-modulating with a monitoring frequency signal, and the optical receiving device is provided with an optical signal of two wavelengths arriving at the optical fiber (8). A demodulation circuit for demodulating the monitoring frequency signal whose amplitude is modulated for each of the above.
【００１１】前記二つの光信号（λ1 、λ2 ）の前記光
増幅器（４）の出力レベルはその光増幅器の飽和レベル
に近い値であることが望ましい。The output level of the optical amplifier (4) for the two optical signals (λ 1 , λ 2 ) is preferably close to the saturation level of the optical amplifier.
【００１２】[0012]
【作用】互いに波長の異なる二つの光信号（λ1 、
λ2 ）の一方のみについて監視周波数信号（例えば数百
ｋＨｚ）で振幅変調する。二つの光信号は共に一つの光
増幅器で増幅される。かりにその光増幅器の出力レベル
をほとんどその光増幅器の飽和レベルに近く設定してお
くと、監視周波数信号で振幅変調された光信号の振幅が
大きいタイミングでは、増幅器が飽和して監視周波数信
号で変調されていない光信号は増幅率が見かけ上低下す
る。また振幅が小さいタイミングでは増幅器の飽和がな
いから増幅器の増幅率は正常値になる。すなわち、一方
を振幅変調すると他方も増幅器出力ではその１８０°位
相が異なる信号で振幅変調されたことになる。これは、
必ずしも増幅器が飽和状態でなくとも、十分に出力レベ
ルの高い領域で見られる。これをここでは「増幅器の利
得競合」という。[Operation] Two optical signals (λ 1 ,
Only one of λ 2 ) is amplitude-modulated with the monitor frequency signal (for example, several hundred kHz). Both two optical signals are amplified by one optical amplifier. However, if the output level of the optical amplifier is set almost close to the saturation level of the optical amplifier, the amplifier is saturated and modulated by the monitoring frequency signal at the timing when the amplitude of the optical signal amplitude-modulated by the monitoring frequency signal is large. The amplification factor of the optical signal that has not been processed apparently decreases. In addition, at a timing when the amplitude is small, the amplification factor of the amplifier becomes a normal value because the amplifier is not saturated. In other words, when one is amplitude-modulated, the other is also amplitude-modulated by signals whose phases are different by 180 ° in the amplifier output. this is,
Even if the amplifier is not always in the saturated state, it is found in a region where the output level is sufficiently high. This is called “amplifier gain competition” here.
【００１３】この現象を利用することにより、二つの光
信号のうち一方のみに監視周波数信号で振幅変調すれ
ば、他方についても監視周波数信号で振幅変調されたこ
とになり、長い光ファイバを経由した受信装置ではいず
れの波長についても監視を行うことができる。By utilizing this phenomenon, if only one of the two optical signals is amplitude-modulated by the supervisory frequency signal, the other is also amplitude-modulated by the supervisory frequency signal, and the signal is transmitted through a long optical fiber. The receiver can monitor any wavelength.
【００１４】[0014]
【実施例】次に、本発明実施例を図面に基づいて説明す
る。図１は本発明実施例の要部の構成を示すブロック
図、図２は本発明実施例における第一の光送信盤および
第二の光送信盤の構成を示す図、図３は本発明実施例に
おける第一の光受信盤および第二の光受信盤の構成を示
す図である。Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a main part of an embodiment of the present invention, FIG. 2 is a diagram showing configurations of a first optical transmission board and a second optical transmission board in the embodiment of the present invention, and FIG. 3 is an implementation of the present invention. It is a figure which shows the structure of the 1st optical receiving board and the 2nd optical receiving board in an example.
【００１５】本発明実施例は、互いに波長の異なる二つ
の光信号（λ1 、λ2 ）を多重し光増幅器４で増幅して
光ファイバ８に送出する光送信装置１１と、この光ファ
イバ８に到来する光信号を二つの波長に分離して受信す
る光受信装置１２とを備え、光送信装置１１には、監視
制御信号を発生する監視制御信号発生器９と、入力した
電気信号を光信号に変換し波長の異なる光信号それぞれ
に監視制御信号を重畳して送出する第一の光送信盤１お
よび第二の光送信盤２と、この二つの光送信盤１および
２からの光信号を合成する光カップラ３と、この光カッ
プラ３からの出力を所定レベルまで増幅して光ファイバ
８に送出する光増幅器４とを備え、光受信装置１２に、
光ファイバ８からの光信号を個々の波長に応じて分配す
るＷＤＭ（波長分割多重）フィルタ５と、このＷＤＭフ
ィルタ５により分配された光信号をそれぞれ受信する第
一の光受信盤６および第二の光受信盤７とを備え、この
第一の光受信盤６および第二の光受信盤７には監視信号
を受信する監視信号受信器１３がそれぞれ接続される。In the embodiment of the present invention, an optical transmitter 11 which multiplexes two optical signals (λ 1 , λ 2 ) having different wavelengths, amplifies them by an optical amplifier 4 and sends them to an optical fiber 8, and this optical fiber 8 An optical receiving device 12 for separating an optical signal arriving at the optical path into two wavelengths and receiving the optical signal, and the optical transmitting device 11 includes a monitor control signal generator 9 for generating a monitor control signal and an optical signal for receiving the input electric signal. A first optical transmission board 1 and a second optical transmission board 2 for converting the signals into optical signals and superimposing the supervisory control signals on the optical signals having different wavelengths, respectively, and the optical signals from the two optical transmission boards 1 and 2. And an optical amplifier 4 for amplifying the output from the optical coupler 3 to a predetermined level and sending it to the optical fiber 8.
A WDM (wavelength division multiplexing) filter 5 that distributes the optical signal from the optical fiber 8 according to each wavelength, and a first optical receiver 6 and a second optical receiver 6 that respectively receive the optical signal distributed by the WDM filter 5. The optical signal receiving board 7 and the optical signal receiving board 7 for receiving the monitoring signal are connected to the first optical signal receiving board 6 and the second optical signal receiving board 7, respectively.
【００１６】また、第一の光送信盤１および第二の光送
信盤２は、図２に示すように、入力信号を光電変換する
光電変換器２１と、二つの光信号（λ1 、λ2 ）の一方
を監視周波数信号により振幅変調する振幅変調手段２２
と、電源２３により構成され、第一の光受信盤６および
第二の光受信盤７は、図３に示すように、光ファイバ８
に到来する光信号を電気信号に変換する電気光変換器３
１と、二つの波長の光信号のそれぞれについて振幅変調
された監視周波数信号を復調する復調回路３２とにより
構成される。The first optical transmission board 1 and the second optical transmission board 2 are, as shown in FIG. 2, a photoelectric converter 21 for photoelectrically converting an input signal and two optical signals (λ 1 , λ). 2 ) Amplitude modulation means 22 for amplitude-modulating one of the two with a monitoring frequency signal
And a power source 23, the first optical receiving board 6 and the second optical receiving board 7 are provided with an optical fiber 8 as shown in FIG.
-Optical converter 3 for converting an optical signal arriving at
1 and a demodulation circuit 32 that demodulates the monitor frequency signal that is amplitude-modulated for each of the two wavelength optical signals.
【００１７】前記二つの光信号（λ1 、λ2 ）の前記光
増幅器４の出力レベルはその光増幅器の飽和レベルに近
い値である。The output level of the optical amplifier 4 for the two optical signals (λ 1 , λ 2 ) is a value close to the saturation level of the optical amplifier.
【００１８】次に、このように構成された本発明実施例
の動作について説明する。Next, the operation of the embodiment of the present invention thus constructed will be described.
【００１９】第一の光送信盤１からの波長λ1 の出力信
号と第二の光送信盤２からの波長λ2 の出力信号とは、
光カップラ３によって合波され、光増幅器４に入力され
る。光増幅器４で所定の出力レベルまで増幅された信号
は、光ファイバ８に送出される。一方、光ファイバ８を
伝送された信号は、ＷＤＭフィルタ５にてそれぞれの波
長成分λ1 、λ2 に分離された後、第一の光受信盤６
（波長λ1 の信号を受ける光受信盤）と第二の光受信盤
７（波長λ2 の信号を受ける光受信盤）に入力されて識
別再生される。[0019] The first wavelength lambda 2 of the output signal from the output signal and a second optical transmission board 2 wavelengths lambda 1 from the optical transmission board 1,
It is multiplexed by the optical coupler 3 and input to the optical amplifier 4. The signal amplified by the optical amplifier 4 to a predetermined output level is sent to the optical fiber 8. On the other hand, the signal transmitted through the optical fiber 8 is separated into wavelength components λ 1 and λ 2 by the WDM filter 5, and then the first optical receiver 6
The signals are inputted to (optical receiving board for receiving signal of wavelength λ 1 ) and second optical receiving board 7 (optical receiving board for receiving signal of wavelength λ 2 ) and identified and reproduced.
【００２０】すなわち、第一の光受信盤１が低周波のキ
ャリアにＡＭ変調をかけて主信号に重畳して監視制御信
号とし、この監視制御信号が重畳された信号光および重
畳されていない第二の光送信盤２からの出力信号は光カ
ップラ３によって合波された後に光増幅器４に入力す
る。この場合、光増幅器４は、信号光を入力レベルの所
定の範囲内（本実施例では、入力レベル範囲を、−１０
ｄＢｍ〜−３ｄＢｍ）で一定出力レベル（本実施例では
＋１０ｄＢｍ）になるように制御し、また、第一の光送
信盤１の監視制御信号のキャリアとして１０ＫＨｚの信
号を適用し、このキャリアに監視制御信号をＡＭ変調に
より重畳して主信号である光信号に構成する。光増幅器
４を通過した後の波長λ2 の信号光は、光増幅器４の利
得競合により波長λ1 の信号光に重畳された監視制御信
号とは１８０°位相が反転したＡＭ信号が重畳されて出
力される。That is, the first optical receiving board 1 applies AM modulation to a low-frequency carrier and superimposes it on the main signal to form a supervisory control signal. The signal light on which this supervisory control signal is superimposed and the non-superimposed signal light. The output signal from the second optical transmission board 2 is multiplexed by the optical coupler 3 and then input to the optical amplifier 4. In this case, the optical amplifier 4 outputs the signal light within a predetermined range of the input level (in the present embodiment, the input level range is −10).
The output level is controlled to a constant output level (+10 dBm in this embodiment) at a level of dBm to -3 dBm, and a signal of 10 KHz is applied as a carrier of the monitoring control signal of the first optical transmission board 1 to monitor this carrier. The control signal is superposed by AM modulation to form an optical signal which is a main signal. The signal light of wavelength λ 2 after passing through the optical amplifier 4 is superposed with an AM signal whose phase is inverted by 180 ° with respect to the supervisory control signal superposed on the signal light of wavelength λ 1 due to gain competition of the optical amplifier 4. Is output.
【００２１】光増幅器４の出力信号は、光ファイバ８を
伝送後にＷＤＭフィルタ５によって、λ1 、λ2 の波長
成分に分離され、それぞれ対応する第一の光受信盤１お
よび第二の光受信盤２に入力する。第一の光受信盤１お
よび第二の光受信盤２では内部に設けた復調回路３２
が、それぞれに重畳された監視制御信号を復調する。The output signal of the optical amplifier 4 is separated into wavelength components of λ 1 and λ 2 by the WDM filter 5 after being transmitted through the optical fiber 8, and the corresponding first optical receiving board 1 and second optical receiving board 1 are received. Input on board 2. In the first optical receiving board 1 and the second optical receiving board 2, a demodulation circuit 32 provided inside
, Demodulates the supervisory control signal superimposed on each.
【００２２】従来例では、多重化する個々のチャンネル
ごとに異なる周波数で監視制御信号を送出していたが、
本発明では、２チャンネルの内の一方のチャンネルにだ
け監視制御信号を重畳して、光増幅器４の利得競合を利
用することにより、１チャンネルに重畳した監視制御信
号で２チャンネル同時の監視を実施することができる。In the conventional example, the supervisory control signal is transmitted at a different frequency for each multiplexed channel.
According to the present invention, the supervisory control signal is superimposed on only one of the two channels, and the gain competition of the optical amplifier 4 is used to perform simultaneous monitoring of the two channels with the supervisory control signal superimposed on one channel. can do.
【００２３】[0023]
【発明の効果】以上説明したように本発明によれば、一
方のチャンネルに監視制御信号を重畳することにより、
２チャンネル同時に監視制御を行うことができる効果が
ある。As described above, according to the present invention, by superimposing the supervisory control signal on one channel,
There is an effect that two channels can be simultaneously monitored and controlled.
【図１】本発明実施例の要部の構成を示すブロック図。FIG. 1 is a block diagram showing a configuration of a main part of an embodiment of the present invention.
【図２】本発明実施例における第一の光送信盤および第
二の光送信盤の構成を示す図。FIG. 2 is a diagram showing a configuration of a first optical transmission board and a second optical transmission board in the embodiment of the present invention.
【図３】本発明実施例における第一の光受信盤および第
二の光受信盤の構成を示す図。FIG. 3 is a diagram showing a configuration of a first optical receiving board and a second optical receiving board in the embodiment of the present invention.
【図４】従来例の要部の構成を示す図。FIG. 4 is a diagram showing a configuration of a main part of a conventional example.
【符号の説明】 １ 第一の光送信盤 ２ 第二の光送信盤 ３ 光カップラ ４ 光増幅器 ５ ＷＤＭフィルタ ６ 第一の光受信盤 ７ 第二の光受信盤 ８ 光ファイバ ９ 監視制御信号発生器（周波数ｆｓ１） １０ 監視制御信号発生器（周波数ｆｓ２） １１、１１′ 光送信装置 １２、１２′ 光受信装置 １３ 監視信号受信器 ２１ 光電変換器 ２２ 振幅変調手段 ２３ 電源 ３１ 電気光変換器 ３２ 復調回路[Explanation of Codes] 1 first optical transmitter 2 second optical transmitter 3 optical coupler 4 optical amplifier 5 WDM filter 6 first optical receiver 7 second optical receiver 8 optical fiber 9 supervisory control signal generation Device (frequency fs1) 10 supervisory control signal generator (frequency fs2) 11, 11 'optical transmitter 12, 12' optical receiver 13 supervisory signal receiver 21 photoelectric converter 22 amplitude modulator 23 power supply 31 electro-optical converter 32 Demodulation circuit
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０４Ｊ 1/00 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location H04J 1/00
Claims (2)
（λ1 、λ2 ）を多重し光増幅器で増幅して光ファイバ
に送出する光送信装置と、この光ファイバに到来する光
信号を二つの波長に分離して受信する光受信装置とを備
えた波長多重光通信方式において、 前記光送信装置には、二つの光信号（λ1 、λ2 ）の一
方を前記増幅器の入力側で監視周波数信号により振幅変
調する手段を備え、 前記光受信装置では、前記光ファイバに到来する二つの
波長の光信号のそれぞれについて振幅変調された前記監
視周波数信号を復調する復調回路を備えたことを特徴と
する波長多重光通信方式。1. An optical transmitter that multiplexes two optical signals (λ 1 , λ 2 ) having different wavelengths, amplifies them with an optical amplifier and sends them to an optical fiber, and two optical signals that arrive at this optical fiber. In a wavelength division multiplexing optical communication system provided with an optical receiving device for separating and receiving wavelengths, in the optical transmitting device, one of two optical signals (λ 1 , λ 2 ) is monitored at an input side of the amplifier. The optical receiver comprises a demodulation circuit for demodulating the amplitude-modulated monitoring frequency signal for each of the optical signals of two wavelengths arriving at the optical fiber. Wavelength division multiplexing optical communication system.
光増幅器の出力レベルはその光増幅器の飽和レベルに近
い値である請求項１記載の波長多重光通信方式。2. The wavelength division multiplexing optical communication system according to claim 1, wherein the output levels of the two optical signals (λ 1 , λ 2 ) of the optical amplifier are close to the saturation level of the optical amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5328652A JP2720777B2 (en) | 1993-12-24 | 1993-12-24 | WDM optical communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5328652A JP2720777B2 (en) | 1993-12-24 | 1993-12-24 | WDM optical communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07183871A true JPH07183871A (en) | 1995-07-21 |
| JP2720777B2 JP2720777B2 (en) | 1998-03-04 |
Family
ID=18212656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5328652A Expired - Lifetime JP2720777B2 (en) | 1993-12-24 | 1993-12-24 | WDM optical communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2720777B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0784391A2 (en) * | 1996-01-10 | 1997-07-16 | Nec Corporation | Wavelength division multiplexing light transmitting system |
| FR2744866A1 (en) * | 1996-02-13 | 1997-08-14 | Alcatel Submarcom | OPTICAL SIGNAL TRANSMISSION SYSTEM COMPRISING A REPEATER MONITORING SYSTEM |
| KR100264760B1 (en) * | 1996-06-03 | 2000-09-01 | 야마토 히데오미 | Optical receiver board, optical wavelength-tuning filter module used for optical receiver board, actuator for optical wavelength-tuning filter module |
| KR100303324B1 (en) * | 1999-05-12 | 2001-09-26 | 윤종용 | Reference wavelength supply apparatus for performance monitor of wavelength division multiplex optical transmission system |
| KR100342757B1 (en) * | 1999-10-05 | 2002-07-04 | 이계철 | Apparatus for measuring property of multichannel optical signal in wavelength division multiplexing |
| US6542272B1 (en) | 1998-02-24 | 2003-04-01 | Nec Corporation | Control signal transmission method and apparatus for optical transmission system |
| JP2015061175A (en) * | 2013-09-18 | 2015-03-30 | 日本電信電話株式会社 | Optical transmitter, optical receiver, signal superposition apparatus, signal superposition system, and signal superposition method |
| JP2017153148A (en) * | 2017-05-09 | 2017-08-31 | 日本電信電話株式会社 | Optical transmission device, optical multiplex reception device, and signal superposition system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0317633A (en) * | 1989-06-15 | 1991-01-25 | Hitachi Ltd | Optical inverter |
| JPH0583196A (en) * | 1991-09-19 | 1993-04-02 | Fujitsu Ltd | Optical transmitter |
-
1993
- 1993-12-24 JP JP5328652A patent/JP2720777B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0317633A (en) * | 1989-06-15 | 1991-01-25 | Hitachi Ltd | Optical inverter |
| JPH0583196A (en) * | 1991-09-19 | 1993-04-02 | Fujitsu Ltd | Optical transmitter |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0784391A2 (en) * | 1996-01-10 | 1997-07-16 | Nec Corporation | Wavelength division multiplexing light transmitting system |
| EP0784391A3 (en) * | 1996-01-10 | 2000-11-29 | Nec Corporation | Wavelength division multiplexing light transmitting system |
| FR2744866A1 (en) * | 1996-02-13 | 1997-08-14 | Alcatel Submarcom | OPTICAL SIGNAL TRANSMISSION SYSTEM COMPRISING A REPEATER MONITORING SYSTEM |
| EP0790716A1 (en) * | 1996-02-13 | 1997-08-20 | Alcatel Submarine Networks | Installation for optical signal transmission comprising a repeater monitoring system |
| KR100264760B1 (en) * | 1996-06-03 | 2000-09-01 | 야마토 히데오미 | Optical receiver board, optical wavelength-tuning filter module used for optical receiver board, actuator for optical wavelength-tuning filter module |
| US6542272B1 (en) | 1998-02-24 | 2003-04-01 | Nec Corporation | Control signal transmission method and apparatus for optical transmission system |
| KR100303324B1 (en) * | 1999-05-12 | 2001-09-26 | 윤종용 | Reference wavelength supply apparatus for performance monitor of wavelength division multiplex optical transmission system |
| KR100342757B1 (en) * | 1999-10-05 | 2002-07-04 | 이계철 | Apparatus for measuring property of multichannel optical signal in wavelength division multiplexing |
| JP2015061175A (en) * | 2013-09-18 | 2015-03-30 | 日本電信電話株式会社 | Optical transmitter, optical receiver, signal superposition apparatus, signal superposition system, and signal superposition method |
| JP2017153148A (en) * | 2017-05-09 | 2017-08-31 | 日本電信電話株式会社 | Optical transmission device, optical multiplex reception device, and signal superposition system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2720777B2 (en) | 1998-03-04 |
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