JP2005051189A - Optical multiplexing/demultiplexing apparatus, and optical wavelength multiplexing transmission system - Google Patents

Optical multiplexing/demultiplexing apparatus, and optical wavelength multiplexing transmission system Download PDF

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JP2005051189A
JP2005051189A JP2003309375A JP2003309375A JP2005051189A JP 2005051189 A JP2005051189 A JP 2005051189A JP 2003309375 A JP2003309375 A JP 2003309375A JP 2003309375 A JP2003309375 A JP 2003309375A JP 2005051189 A JP2005051189 A JP 2005051189A
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Hideya Furumoto
秀冶 古本
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Hitachi Information Technology Co Ltd
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Hitachi Hybrid Network Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To prevent the generation of gain tilts in wavelength multiplexing signal light in spite of the aged deterioration of a relay station and the change of transmission-line loss, etc. <P>SOLUTION: In addition to an optical amplifying portion 20 and a branching/inserting means 30, an optical multiplexing/demultiplexing apparatus 10 has a level signal adjusting means 40 for so determining the difference between the signal levels of the signals having two kinds of branched wavelengths and so absorbing the determined difference as to adjust the amplifying gain of the optical amplifying portion 20. The level signal adjusting means 40 has an operating portion 41 for determining a difference Δ between the signal levels of the signal lights λ1, λ8 having branched wavelengths and a correcting portion 42 for adjusting the amplifying gain of the optical amplifying portion 20 based on the difference Δ between the signal lights which is determined by the operating portion 41. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

発明の詳細な説明Detailed Description of the Invention

本発明は、光合分波装置及びその光合分波装置を備えた光波長多重伝送システムに係り、特に、波長多重伝送システムを利用した光通信ネットワークに用いるのに好適な技術に関する。  The present invention relates to an optical multiplexing / demultiplexing device and an optical wavelength division multiplexing transmission system including the optical multiplexing / demultiplexing device, and more particularly to a technique suitable for use in an optical communication network using the wavelength multiplexing transmission system.

波長多重伝送方式(WDM)を用いた光通信ネットワークシステムにおいては、その伝送路の途中に光合分波装置が設置され、光合分波装置が、波長多重された信号光のうち、所望の波長の信号光を分岐させると共に、それとは異なる残りの波長の信号光に他の波長の信号光を挿入して合波させる、いわゆる信号光の分岐・挿入を行うことで、柔軟なネットワークを構築するようになっている。  In an optical communication network system using a wavelength division multiplexing transmission system (WDM), an optical multiplexing / demultiplexing device is installed in the middle of the transmission path, and the optical multiplexing / demultiplexing device has a desired wavelength of the wavelength multiplexed signal light. A flexible network is constructed by branching and inserting so-called signal light that branches and multiplexes signal light of other wavelengths into the signal light of the remaining wavelength different from that, while branching the signal light. It has become.

図5に従来の光合分波装置を用いた光波長多重伝送システムを示している。図5に示すように、送信側には光送信端局装置1が、受信側には光受信端局装置2がそれぞれ設置され、両者1、2間の伝送路3には、中継器(光増幅器)4及び光合分波装置10が設けられている。そして、光送信端局装置1からそれぞれ波長の異なる複数の信号光が一本の光ファイバからなる伝送路3によって多重送信され、その途中で中継器4によって増幅されたり、また光合分波装置10によって波長毎に応じて伝送路3に振り分けられたりしながら、光受信端局装置2や端局装置6に送信されるようになっている。  FIG. 5 shows an optical wavelength division multiplexing transmission system using a conventional optical multiplexing / demultiplexing device. As shown in FIG. 5, an optical transmitting terminal device 1 is installed on the transmitting side, and an optical receiving terminal device 2 is installed on the receiving side. An amplifier) 4 and an optical multiplexer / demultiplexer 10 are provided. Then, a plurality of signal lights each having a different wavelength are multiplexed and transmitted from the optical transmission terminal apparatus 1 through a transmission path 3 made of a single optical fiber, and are amplified by the repeater 4 in the middle of the signal light, or the optical multiplexing / demultiplexing apparatus 10 Thus, the signal is transmitted to the optical receiving terminal device 2 and the terminal device 6 while being distributed to the transmission path 3 according to the wavelength.

このような光波長多重伝送システムに設けられる従来の光合分波装置10の一例を図6に示す。
即ち、従来の光合分波装置10は、図6に示すように、光増幅部51と、分岐・挿入手段52とを備え、入力された多重信号光が光増幅部51によって増幅された後、その多重信号光のうち、特定の複数の波長の信号光がドロップ(DROP)系53によって分岐され、残りの複数の波長光がアド(ADD)系54から挿入される信号光と合波されることで、伝送路3に出力されるようになっている。この場合、分岐・挿入手段52としては、誘電体多層膜フィルタ、WDMカプラ、ファイバグレーティング、アレイ導波路などを用いることで構成されている。
なお、ドロップ系53によって分岐された信号光は、図5に示す光受信端局装置2とは異なる端局装置6に送信され、アド系54には図示しない装置から合波用の信号光が挿入される。
An example of a conventional optical multiplexing / demultiplexing device 10 provided in such an optical wavelength multiplexing transmission system is shown in FIG.
That is, as shown in FIG. 6, the conventional optical multiplexing / demultiplexing device 10 includes an optical amplifying unit 51 and a branching / inserting unit 52. After the input multiplexed signal light is amplified by the optical amplifying unit 51, Among the multiplexed signal light, signal light of a plurality of specific wavelengths is branched by a drop (DROP) system 53, and the remaining plurality of wavelength lights are combined with signal light inserted from an add (ADD) system 54. As a result, it is output to the transmission path 3. In this case, the branching / inserting means 52 is configured by using a dielectric multilayer filter, a WDM coupler, a fiber grating, an arrayed waveguide, or the like.
The signal light branched by the drop system 53 is transmitted to a terminal station device 6 different from the optical receiving terminal device 2 shown in FIG. 5, and a signal light for multiplexing is sent to the add system 54 from a device not shown. Inserted.

発明が解決しようとする課題Problems to be solved by the invention

一般に、光波長多重伝送システムにおいては、多重信号光を構成しているそれぞれの波長の信号光の信号レベルが一定になるように調整されている。
ところが、伝送路の途中に設けられている中継器(光増幅器)4の経年変化や伝送路3を構成する光ファイバの損失変化などが起こったりすると、波長多重信号光の各波長の信号レベルが平坦でなくなり、例えば図7に示すように一番短い波長の信号光λ1が最も小さくなると共に、そこからより長い波長λ2〜λ8になるにつれて次第に大きな信号光となる右肩上がりの状態の傾き(ゲインチルトと称す)が発生してしまう。そのため、そのようなゲインチルトを有する波長多重信号光が光合分波装置10に送り込まれると、該光合分波装置10の光増幅部51がそのゲインチルトに従って処理してしまう。
In general, in an optical wavelength division multiplexing transmission system, the signal levels of the signal lights having the respective wavelengths constituting the multiplexed signal light are adjusted to be constant.
However, when the secular change of the repeater (optical amplifier) 4 provided in the middle of the transmission path or the loss change of the optical fiber constituting the transmission path 3 occurs, the signal level of each wavelength of the wavelength multiplexed signal light is changed. For example, as shown in FIG. 7, the signal light λ1 having the shortest wavelength is the smallest, and the slope of the upwardly rising state that becomes gradually larger signal light from the longer wavelengths λ2 to λ8 ( (Referred to as gain tilt). Therefore, when wavelength multiplexed signal light having such a gain tilt is sent to the optical multiplexing / demultiplexing device 10, the optical amplifying unit 51 of the optical multiplexing / demultiplexing device 10 performs processing according to the gain tilt.

即ち、光合分波装置10は、ゲインチルトを有する波長多重信号光が入力されると、光増幅部51がそれぞれの波長の信号光をそのままの信号レベルの比率で増幅した後、その信号光に対して分岐・挿入手段52が単に分岐・挿入するので、例えば分岐された信号光が長い波長の場合には、信号レベルがいっそう大きくなってしまって受光素子の素子破壊を招く一方、短い波長の信号光の場合には、信号レベルが小さいことからS/N比の劣化によって伝送品質の低下を招くおそれがあり、安定した波長多重信号光を供給することができない問題があった。  That is, when wavelength multiplexed signal light having a gain tilt is input to the optical multiplexer / demultiplexer 10, the optical amplifying unit 51 amplifies the signal light of each wavelength at the ratio of the signal level as it is, Since the branch / insertion means 52 simply branches / inserts, for example, when the branched signal light has a long wavelength, the signal level is further increased, leading to the element destruction of the light receiving element, while the short wavelength signal In the case of light, since the signal level is small, there is a possibility that the transmission quality is lowered due to the deterioration of the S / N ratio, and there is a problem that stable wavelength multiplexed signal light cannot be supplied.

また、この問題を解決するため、伝送路の末端側で管理者が多重信号光を測定して分析し、それぞれの波長の信号光が一定となるよう、光送信端局装置側と連絡を取りつつ調整を行う場合もあるが、そのようにする場合、光受信端局装置2や端局装置6に対する送信を一時的に中断して行うので、それら端局装置2及び6側に迷惑がかかるばかりでなく、その調整作業にかなりの時間及び労力を要するという問題があった。  In order to solve this problem, the administrator measures and analyzes the multiplexed signal light at the end of the transmission line, and communicates with the optical transmission terminal equipment side so that the signal light of each wavelength is constant. However, in such a case, since transmission to the optical receiving terminal device 2 and the terminal device 6 is temporarily interrupted, the terminal devices 2 and 6 are bothered. In addition, there is a problem that the adjustment work requires considerable time and labor.

本発明の目的は、上記従来技術の問題点に鑑み、中継局の経年変化や伝送路の損失変化等に拘わることなく、波長多重信号光にゲインチルトが発生するのを確実に防止することができ、以て安定した波長多重信号光を得て、信頼性を高めることができる光合分波装置及び光波長多重伝送システムを提供することにある。  An object of the present invention is to prevent the occurrence of gain tilt in wavelength-division multiplexed signal light, regardless of the aging of the relay station and the change of loss of the transmission path, etc. Accordingly, it is an object of the present invention to provide an optical multiplexing / demultiplexing device and an optical wavelength division multiplexing transmission system that can obtain stable wavelength division multiplexed signal light and improve reliability.

課題を解決するための手段Means for solving the problem

上記課題を解決するため、本発明の請求項1に係る発明は、波長多重された信号光を増幅する光増幅部と、該光増幅部によって増幅された波長多重信号光のうち、少なくとも波長の異なる二種類の信号光を分岐させる一方、残りの他の波長の異なる信号光に信号光を合波させて出力する分岐・挿入手段とを備えた光合分波装置において、前記分岐された二種類の信号光の信号レベルの差を求めと共に、該求めた差を吸収する方向に前記光増幅部を調整するレベル信号調整手段を備えたことを特徴とする。  In order to solve the above-mentioned problems, an invention according to claim 1 of the present invention is directed to an optical amplifying unit that amplifies wavelength-multiplexed signal light, and at least a wavelength of the wavelength-multiplexed signal light amplified by the optical amplifying unit. In an optical multiplexing / demultiplexing device comprising a branching / inserting means for branching two different types of signal light, and combining and outputting the signal light to the remaining other signal lights having different wavelengths, the branched two types And a level signal adjusting means for adjusting the optical amplifying unit in a direction for absorbing the obtained difference.

本発明に係る光合分波装置によれば、波長多重信号光が入力されると、レベル信号調整手段が、分岐・挿入手段から分岐されたそれぞれの信号光の信号レベルの大きさの差を求めると共に、該求めた差を吸収する方向に光増幅部を調整するので、光増幅部から出力された波長多重信号光にゲインチルトが起こるのを防止することができる、信号レベルに差のない安定した波長多重信号光を良好に得ることができる。  According to the optical multiplexing / demultiplexing device of the present invention, when wavelength multiplexed signal light is input, the level signal adjusting means obtains the difference in signal level between the signal lights branched from the branching / inserting means. At the same time, the optical amplifying unit is adjusted in a direction to absorb the obtained difference, so that it is possible to prevent a gain tilt from occurring in the wavelength multiplexed signal light output from the optical amplifying unit, and there is no difference in signal level. Wavelength multiplexed signal light can be obtained satisfactorily.

請求項2に係る発明は、請求項1記載の光合分波装置において、前記レベル信号調整手段は、前記分岐された二種類の信号光の信号レベルの差を求める演算部と、該演算部によって求めた信号レベルの差に基づいて光増幅部の増幅度を調整する補正部とを備えていることを特徴とする。  According to a second aspect of the present invention, in the optical multiplexing / demultiplexing device according to the first aspect, the level signal adjusting means includes a calculation unit for obtaining a difference between signal levels of the two types of branched signal lights, and the calculation unit. And a correction unit that adjusts the amplification degree of the optical amplification unit based on the obtained difference in signal level.

本発明に係る光合分波装置によれば、レベル信号調整手段が演算部と補正部とを備えているので、光増幅部から出力される波長多重信号光に発生するゲインチルトを確実に吸収することができ、ゲインチルトの防止効果を良好に果たすことができる。  According to the optical multiplexing / demultiplexing device of the present invention, since the level signal adjustment means includes the calculation unit and the correction unit, it can reliably absorb the gain tilt generated in the wavelength multiplexed signal light output from the optical amplification unit. And the effect of preventing gain tilt can be achieved satisfactorily.

請求項3に係る発明は、請求項2記載の光合分波装置において、前記演算部は、前記分岐された二種類の信号光をそれぞれ更に分岐させて検出するモニタ部を有することを特徴とする。
本発明に係る光合分波装置によれば、演算部の前記モニタ部が分岐されたそれぞれの信号光を検出することで、それぞれの信号光の信号レベルを正確に検出することができる。
According to a third aspect of the present invention, in the optical multiplexing / demultiplexing device according to the second aspect, the calculation unit includes a monitor unit that further divides and detects the two types of branched signal lights. .
According to the optical multiplexing / demultiplexing device of the present invention, the signal level of each signal light can be accurately detected by detecting each signal light branched by the monitor unit of the calculation unit.

請求項4に係る発明は、請求項3記載の光合分波装置において、前記モニタ部は、前記分岐された二種類の信号光の分岐伝送路にそれぞれ設けられた光カプラと、該光カプラによって更に分岐されたそれぞれの信号光を光電変換する光電変換素子とからなることを特徴とする。
本発明に係る光合分波装置によれば、前記光カプラと前記光電変換素子を有し、分岐されたそれぞれの波長の信号光の信号レベルの大きさを的確に検出することができるので、演算部がそれぞれの信号レベルの差を正確に求めることができる。
According to a fourth aspect of the present invention, in the optical multiplexing / demultiplexing device according to the third aspect, the monitor unit includes an optical coupler provided in each of the branched transmission paths of the two types of branched signal lights, and the optical coupler. Furthermore, it comprises a photoelectric conversion element that photoelectrically converts each branched signal light.
According to the optical multiplexer / demultiplexer according to the present invention, since the optical coupler and the photoelectric conversion element are included, the magnitude of the signal level of the branched signal light of each wavelength can be accurately detected. Can accurately determine the difference between the signal levels.

請求項5に係る発明は、請求項2から4のいずれか記載の光合分波装置において、前記補正部は、前記光増幅部の励起光源に対する設定温度を、前記信号レベルの差に応じて変更させることを特徴とする。
本発明に係る光合分波装置によれば、補正部が光増幅部の励起光源に対する設定温度を、前記信号レベルの差に応じて変更させるので、光増幅部から出力される波長多重信号光における各信号光の信号レベルを確実に一定にすることができる。
According to a fifth aspect of the present invention, in the optical multiplexing / demultiplexing device according to any one of the second to fourth aspects, the correction unit changes a set temperature for the pumping light source of the optical amplification unit according to the difference in the signal level. It is characterized by making it.
According to the optical multiplexing / demultiplexing device according to the present invention, the correction unit changes the set temperature of the optical amplification unit with respect to the pumping light source according to the difference in the signal level, so in the wavelength multiplexed signal light output from the optical amplification unit The signal level of each signal light can be made constant.

請求項6に係る発明は、請求項1から5のいずれか記載の光合分波装置を備えていることを特徴とする。
本発明に係る光波長多重伝送システ厶によれば、光合分波装置が中継局の経年変化や伝送路の損失変化等に拘わることなく、波長多重信号光にゲインチルトが発生するのを確実に防止するので、安定した波長多重信号光を得ることができ、それだけ信頼性を高めることができる。
The invention according to claim 6 is characterized by including the optical multiplexing / demultiplexing device according to any one of claims 1 to 5.
According to the optical wavelength division multiplexing transmission system of the present invention, the optical multiplexing / demultiplexing device reliably prevents the occurrence of gain tilt in the wavelength division multiplexed signal light regardless of the aging of the relay station or the loss of the transmission line. Therefore, stable wavelength-division multiplexed signal light can be obtained, and the reliability can be improved accordingly.

以下、本発明の実施の形態を、図面に基づいて説明する。図1から図4は本発明の第1の実施の形態に係る光合分波装置を光波長多重伝送システ厶に適用した図であって、図1は光合分波装置の構成を示す説明図、図2は光合分波装置のレベル信号調整手段が分岐したそれぞれの信号光の信号レベルの差を求めたときの説明図、図3は光合分波装置のレベル信号調整手段が光増幅部を調整したことで光増幅部から出力された波長多重信号光を示す説明図、図4は光合分波装置のレベル信号調整手段のモニタ部が分岐された二つの波長の信号光の信号レベルを検出したときの説明図である。
この光波長多重伝送システムは、光送信端局装置1と光受信端局装置2との間に敷設された伝送路3の途中位置に中継器(増幅器)4及び光合分波装置10が設けられ、光送信端局装置1からの波長多重信号光が、中継器4によって増幅された後、光合分波装置10によって特定の複数の波長の信号光が分岐され、該分岐された信号光が端局装置6に受信される一方、残りの他の信号光に合波された信号光を光受信端局装置1が受信できるようになっている(図5参照)。
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 4 are diagrams in which the optical multiplexing / demultiplexing device according to the first embodiment of the present invention is applied to an optical wavelength division multiplexing transmission system, and FIG. 1 is an explanatory diagram showing the configuration of the optical multiplexing / demultiplexing device, FIG. 2 is a diagram for explaining the difference between the signal levels of the respective signal lights branched by the level signal adjusting means of the optical multiplexing / demultiplexing apparatus, and FIG. 3 is the level signal adjusting means of the optical multiplexing / demultiplexing apparatus adjusting the optical amplifying unit. FIG. 4 is a diagram illustrating the wavelength-multiplexed signal light output from the optical amplifying unit, and FIG. 4 detects the signal levels of the two wavelength signal lights branched by the monitor unit of the level signal adjusting means of the optical multiplexer / demultiplexer. It is explanatory drawing at the time.
In this optical wavelength division multiplexing transmission system, a repeater (amplifier) 4 and an optical multiplexing / demultiplexing device 10 are provided in the middle of a transmission path 3 laid between the optical transmitting terminal station device 1 and the optical receiving terminal device 2. After the wavelength multiplexed signal light from the optical transmission terminal device 1 is amplified by the repeater 4, the signal light of specific wavelengths is branched by the optical multiplexing / demultiplexing device 10, and the branched signal light is terminated. While being received by the station device 6, the optical receiving terminal device 1 can receive the signal light combined with the remaining other signal light (see FIG. 5).

そして、光合分波装置10は、図1に示すように、光増幅部20と、分岐・挿入手段30とを備え、中継器4を経た波長多重信号光(λ1〜λ8)が入力されると、それを光増幅部20が増幅した後、分岐・挿入手段30が、特定の複数の波長の信号光の分岐及び挿入を行うようになっている。  As shown in FIG. 1, the optical multiplexer / demultiplexer 10 includes an optical amplifying unit 20 and branching / inserting means 30, and when wavelength multiplexed signal light (λ1 to λ8) that has passed through the repeater 4 is input. Then, after the optical amplifying unit 20 amplifies it, the branching / inserting means 30 branches and inserts signal light having a plurality of specific wavelengths.

即ち、分岐・挿入手段30は、本例ではWDMフィルタ31、32と光カプラ33、34とを有し、WDMフィルタ31、32が波長の異なる二つの信号光λ1、λ8をドロップ系35にそれぞれ分岐させる一方、残りの全ての種類の波長の信号光λ2〜λ7にアド系36によって信号光が挿入されて合波が生成されるようになっている。従って、本例の分岐・挿入手段30は、八種類の波長多重信号光λ1〜λ8のうち、波長の最も短い信号光λ1と最も長い信号光λ8との二種類を分岐させ、また残りの波長の信号光λ2〜λ7に対し、分岐された波長と同一波長の信号光λ1′、λ8′が挿入されることで合波を生成している。  That is, the branching / inserting means 30 includes WDM filters 31 and 32 and optical couplers 33 and 34 in this example, and the WDM filters 31 and 32 respectively supply two signal lights λ1 and λ8 having different wavelengths to the drop system 35. On the other hand, the signal light is inserted into the remaining signal lights λ2 to λ7 of all kinds of wavelengths by the add system 36 to generate a multiplexed signal. Therefore, the branching / inserting means 30 of this example branches two types of the shortest wavelength signal light λ1 and the longest signal light λ8 among the eight types of wavelength multiplexed signal light λ1 to λ8, and the remaining wavelengths. The signal lights λ1 ′ and λ8 ′ having the same wavelength as the branched wavelength are inserted into the signal lights λ2 to λ7.

なお、本例では、分岐・挿入手段30によって分岐される信号光の波長と、挿入される信号光の波長とを同一波長としているが、これに限られるものではない。図1において、符号10aは光合分波装置10の入力コネクタ、10b〜10dは同じく光合分波装置10の出力側コネクタである。  In this example, the wavelength of the signal light branched by the branching / inserting means 30 and the wavelength of the inserted signal light are the same, but the present invention is not limited to this. In FIG. 1, reference numeral 10 a is an input connector of the optical multiplexer / demultiplexer 10, and 10 b to 10 d are output connectors of the optical multiplexer / demultiplexer 10.

また、光合分波装置10は、上記光増幅部20及び分岐・挿入手段30の他、分岐された二種類からなる各波長の信号光の信号レベルの差を求めと共に、該求めた差を吸収すべく、光増幅部20の増幅度を調整するレベル信号調整手段40を備えている。  Further, the optical multiplexer / demultiplexer 10 obtains the difference in signal level between the two types of branched light beams in addition to the optical amplifying unit 20 and the branching / inserting means 30, and absorbs the obtained difference. Accordingly, level signal adjusting means 40 for adjusting the amplification degree of the optical amplifying unit 20 is provided.

このレベル信号調整手段40は、分岐された波長の信号光λ1、λ8の信号レベルの大小の差Δを求める演算部41と、この演算部41が求めたそれぞれの信号光の差Δに応じ、光増幅部20の増幅度を調整させる補正部42とを有してしている。  The level signal adjusting means 40 is configured to calculate a difference Δ between the signal levels of the branched wavelength signal lights λ1 and λ8, and a difference Δ between the signal lights obtained by the calculation unit 41. And a correction unit 42 that adjusts the amplification degree of the optical amplification unit 20.

演算部41は、ドロップ系35によって分岐された分岐伝送路3a、3bの途中位置に光カプラ43、44がそれぞれ設けられると共に、光カプラ43、44の分岐出力側に光電変換素子45、46が設けられている。そして、分岐された二つの信号光λ1、λ8が光カプラ43、44によって分岐伝送路3a、3bから更に分岐されると共に、該それぞれの信号光λ1、λ8が光電変換素子45、46によって電気信号に変換されると、図7に示すようなゲインチルトが発生していることから、演算部41が図2に示すように、その変換された信号光λ1の電気信号と信号光λ8の電気信号との差Δを求めるようになっている。  The calculation unit 41 is provided with optical couplers 43 and 44 in the middle positions of the branch transmission lines 3a and 3b branched by the drop system 35, and photoelectric conversion elements 45 and 46 on the branch output side of the optical couplers 43 and 44, respectively. Is provided. Then, the two branched signal lights λ1 and λ8 are further branched from the branch transmission lines 3a and 3b by the optical couplers 43 and 44, and the respective signal lights λ1 and λ8 are electrically signaled by the photoelectric conversion elements 45 and 46, respectively. Since the gain tilt as shown in FIG. 7 occurs, the calculation unit 41 generates the converted electrical signal of the signal light λ1 and the electrical signal of the signal light λ8 as shown in FIG. The difference Δ is obtained.

従って、波長多重信号光からの信号光λ1〜λ8が、図7に示すように右肩上がりのゲインチルトが発生しているとき、演算部41は、図2に示すように、その波長λ1からなる信号光の信号レベルの大きさと波長λ8からなる信号光の信号レベルの大きさとの差Δを演算するようになっている。  Therefore, when the signal light λ1 to λ8 from the wavelength division multiplexed signal light has a rising-right gain tilt as shown in FIG. 7, the calculation unit 41 has the wavelength λ1 as shown in FIG. A difference Δ between the magnitude of the signal level of the signal light and the magnitude of the signal level of the signal light having the wavelength λ8 is calculated.

そのため、演算部41は、上記差Δを求めるに際し、分岐されたそれぞれの信号光λ1、λ8の信号レベルの大きさを検出するために光カプラ43、44と光電変換素子45、46とからなるモニタ部を有し、これによって分岐された二種類の信号光を検出するようになっている。  Therefore, when calculating the difference Δ, the calculation unit 41 includes optical couplers 43 and 44 and photoelectric conversion elements 45 and 46 in order to detect the magnitudes of the signal levels of the branched signal lights λ1 and λ8. A monitor unit is provided to detect two types of signal light branched.

補正部42は、温度制御回路から構成されており、演算部41からの指令信号に基づき光増幅部20に対する増幅度を調整するようになっており、その詳細は後述する。  The correction unit 42 is composed of a temperature control circuit, and adjusts the degree of amplification with respect to the optical amplification unit 20 based on a command signal from the calculation unit 41, the details of which will be described later.

ところで、光増幅部20は、図1に示すように、エルビウム添加ファイバ21と、これに光カプラ23を介して接続された励起光源22と、この励起光源22をフィードバック制御する光出力フィードバック回路24と、エルビウム添加ファイバ21の出力側の光カプラ23より後段に光カプラ25を介して設けられた光電変換素子26とを有している。  By the way, as shown in FIG. 1, the optical amplifying unit 20 includes an erbium-doped fiber 21, a pumping light source 22 connected thereto via an optical coupler 23, and a light output feedback circuit 24 for feedback control of the pumping light source 22. And a photoelectric conversion element 26 provided via an optical coupler 25 downstream of the optical coupler 23 on the output side of the erbium-doped fiber 21.

この光増幅部20は、中継局4(図5参照)からの波長多重信号光λ1〜λ8が入力されてエルビウム添加ファイバ21を通過するとき、励起光源22からの光を光カプラ23を介して合波されることで増幅された後、その増幅された波長多重信号光が光カプラ25によって分岐されると共に、分岐された信号光が光電変換素子26によって電気信号に変換されて光出力フィードバック回路24に入力されると、該光出力フィードバック回路24がその入力信号に基づいて励起光源22を制御することで、波長多重信号光を全体的に一定の割合で増幅するようになっている。  The optical amplifying unit 20 receives the wavelength multiplexed signal light λ1 to λ8 from the relay station 4 (see FIG. 5) and passes through the erbium-doped fiber 21, and transmits the light from the pumping light source 22 via the optical coupler 23. After being amplified by being combined, the amplified wavelength-multiplexed signal light is branched by the optical coupler 25, and the branched signal light is converted into an electric signal by the photoelectric conversion element 26 to be an optical output feedback circuit. 24, the optical output feedback circuit 24 controls the pumping light source 22 based on the input signal, thereby amplifying the wavelength multiplexed signal light at a constant rate as a whole.

この場合、光出力フィードバック回路24は、光電変換素子26が波長帯域内における波長の選択性を有しておらず、エルビウム添加ファイバ21より出力される波長多重信号の全体のトータルパワーを単に光電変換することから、励起光源22に対して出力の信号光が波長帯域内で一定の信号レベルとなるように励起光源22を制御するだけとなる。  In this case, in the optical output feedback circuit 24, the photoelectric conversion element 26 does not have wavelength selectivity in the wavelength band, and the total power of the wavelength multiplexed signal output from the erbium-doped fiber 21 is simply photoelectrically converted. Therefore, it is only necessary to control the excitation light source 22 so that the signal light output to the excitation light source 22 has a constant signal level within the wavelength band.

一般に、光増幅部20の波長利得特性は、中継器4による利得(ゲイン)及び励起光源22の波長によって決定される。つまり、ゲインが一定の場合、励起光源22の波長を変化させたときの波長利得特性が、図7に示すように長波長側になると長波長側の波長利得が上がることにより、励起光源22による波長信号信号光毎のレベルの傾き(ゲインチルト)が右肩上がりに変化し、また図示していないが、励起光源22の波長が短波長側になると短波長側の波長利得が上がることにより励起光源22による波長信号信号光毎のゲインチルトが上記と逆形態の左肩下がりに変化する。  In general, the wavelength gain characteristic of the optical amplifying unit 20 is determined by the gain (gain) of the repeater 4 and the wavelength of the pumping light source 22. In other words, when the gain is constant, when the wavelength gain characteristic when the wavelength of the excitation light source 22 is changed becomes longer, as shown in FIG. The slope of the level (gain tilt) for each wavelength signal signal light changes to the right, and although not shown, when the wavelength of the excitation light source 22 becomes shorter, the wavelength gain on the shorter wavelength side increases, thereby increasing the excitation light source. The gain tilt for each of the wavelength signal light by 22 changes to a left-sided downward shape opposite to the above.

ところが、励起光源22の出力光(励起光)の発振波長は、その発光素子(レーザーダイオード)の発振波長−温度特性により決定される。そして、光合分波装置10における光増幅部20の発光素子(レーザーダイオード)の場合、その発振周波数の波長にもよるが、通常では0.1(nm/℃)の温度特性をもっている。このため、発光素子の温度を変えることで、発振波長を変えることができる。  However, the oscillation wavelength of the output light (excitation light) of the excitation light source 22 is determined by the oscillation wavelength-temperature characteristics of the light emitting element (laser diode). The light emitting element (laser diode) of the optical amplifying unit 20 in the optical multiplexer / demultiplexer 10 usually has a temperature characteristic of 0.1 (nm / ° C.) depending on the wavelength of the oscillation frequency. For this reason, the oscillation wavelength can be changed by changing the temperature of the light emitting element.

そこで、この実施形態においては、演算部41が分岐されたそれぞれの信号光λ1、λ8の差Δを求めることによって補正部42がその差Δを調整するとき、励起光源22の発光素子(レーザーダイオード)に対する設定温度を変え、これにより、発光素子の発振波長が変更され、光増幅部20によって増幅される波長多重信号光の信号レベルのゲインチルトを吸収するように変更させることで、光増幅部20から出力される波長多重信号光のゲインチルトを防止できるようになっている。  Therefore, in this embodiment, when the correction unit 42 adjusts the difference Δ by obtaining the difference Δ between the signal lights λ1 and λ8 branched by the calculation unit 41, the light emitting element (laser diode) of the excitation light source 22 is used. ), The oscillation wavelength of the light emitting element is changed, and the optical amplification unit 20 is changed to absorb the gain tilt of the signal level of the wavelength multiplexed signal light amplified by the optical amplification unit 20. The gain tilt of the wavelength-division multiplexed signal light output from can be prevented.

因みに、励起光源22の発光素子としてのレーザーダイオードの設定温度Tset(℃)と、波長利得制御信号電圧Vt(V)との関係は、レーザーダイオードの初期設定温度をTset1(℃)と、補正部42としての温度制御回路の温度/電圧変換係数をA(℃/V)とすると、以下の数1式にて表すことができる。  Incidentally, the relationship between the set temperature Tset (° C.) of the laser diode as the light emitting element of the excitation light source 22 and the wavelength gain control signal voltage Vt (V) is that the initial set temperature of the laser diode is Tset 1 (° C.) and the correction unit. Assuming that the temperature / voltage conversion coefficient of the temperature control circuit 42 is A (° C./V), it can be expressed by the following equation (1).

Figure 2005051189
Figure 2005051189

従って、補正部42は、演算部41からの差Δの信号に基づいて光増幅部20の励起光源20の設定温度を調整することで、光増幅部20から出力される波長多重信号光のゲインチルトの傾きを吸収し、結果的に図3に示すように、ゲインチルトが存在しない一様の信号レベルとなる波長多重信号光を光増幅部20から送信できるようになっている。
そして、補正部42による調整結果、光増幅部20から分岐・挿入手段30に送信されると、演算部40のモニタ部がそれぞれの信号光λ1、λ8を検出することで、演算部40がそれぞれの信号光λ1、λ8に図4に示すように差がないことを求めることもでき、レベル信号調整手段40自体もフィードバック機能をなしている。図4は、レベル信号調整手段40が機能しているときの、モニタ部によって検出された二つの信号光λ1、λ8の大きさを表している。
なお、図1〜図4において、図5〜図7と同一部分には同一符号を付している。
Therefore, the correction unit 42 adjusts the set temperature of the pumping light source 20 of the optical amplification unit 20 based on the signal of the difference Δ from the calculation unit 41, thereby gain gain tilt of the wavelength multiplexed signal light output from the optical amplification unit 20. As a result, as shown in FIG. 3, wavelength multiplexed signal light having a uniform signal level without gain tilt can be transmitted from the optical amplifying unit 20.
Then, when the adjustment result by the correction unit 42 is transmitted from the optical amplification unit 20 to the branching / insertion unit 30, the monitoring unit of the calculation unit 40 detects the respective signal lights λ1 and λ8, so that the calculation unit 40 respectively As shown in FIG. 4, it can be determined that there is no difference between the signal lights λ1 and λ8, and the level signal adjusting means 40 itself has a feedback function. FIG. 4 shows the magnitudes of the two signal lights λ1 and λ8 detected by the monitor unit when the level signal adjusting means 40 is functioning.
1 to 4, the same parts as those in FIGS. 5 to 7 are denoted by the same reference numerals.

本実施形態の光波長多重伝送システムは、上記のように構成されているので、いま、光送信端局装置1からの光波長多重信号光λ1〜λ8が、中継器4を通過して光合分波装置10に入力され、光合分波装置10によって特定の二種類の波長からなる信号光λ1、λ8が分岐される一方、それに対応する波長の信号光λ1′、λ8′が挿入されて合波が生成されることで、それぞれの信号光が所定方向に伝送される。  Since the optical wavelength division multiplexing transmission system of this embodiment is configured as described above, the optical wavelength division multiplexed signal light λ1 to λ8 from the optical transmission terminal device 1 passes through the repeater 4 and is optically multiplexed. The signal light λ1 and λ8 having two specific wavelengths is branched by the optical multiplexing / demultiplexing device 10 and the signal light λ1 ′ and λ8 ′ having the corresponding wavelengths are inserted and multiplexed. Is generated, each signal light is transmitted in a predetermined direction.

即ち、光合分派装置10は、入力されたそれぞれの光波長多重信号光λ1〜λ8を光増幅部20によって増幅すると、その光波長多重信号光λ1〜λ8から、分岐・挿入手段30のwdmフィルタ31、32によって二種類の信号光λ1、λ8をドロップ系35によって分岐して端局装置6方向に伝送する一方、残りの波長多重信号光λ2〜λ7に対しアド系36によって二種類の波長の信号光λ1′、λ8′が挿入されて合波が生成されることで、その生成された合波の信号光(λ2〜λ7、λ1′、λ8′)を光受信端局装置2方向に伝送する。  That is, when the optical multiplexing / demultiplexing device 10 amplifies the input optical wavelength multiplexed signal light λ1 to λ8 by the optical amplifying unit 20, the optical wavelength division multiplexed signal light λ1 to λ8 is used to generate the wdm filter 31 of the branching / inserting means 30. 32, two types of signal light λ 1 and λ 8 are branched by a drop system 35 and transmitted in the direction of the terminal device 6, while signals of two types of wavelengths are added to the remaining wavelength multiplexed signal light λ 2 to λ 7 by an add system 36. Optical signals λ 1 ′ and λ 8 ′ are inserted to generate a combined signal, and the generated combined signal light (λ 2 to λ 7, λ 1 ′, λ 8 ′) is transmitted in the direction of the optical receiving terminal device 2. .

上記伝送時、光合分波装置10は、分岐・挿入手段30によって分岐された分岐伝送路3a、3bのそれぞれの信号光λ1、λ8が、レベル信号調整手段40を通過すると、該レベル信号調整手段40がそれぞれ各波長の信号光λ1、λ8の信号レベルの大きさの差Δを求めると共に、該求めた差Δを吸収するために光増幅部20の増幅度を調整するので、光増幅部20から出力された波長多重信号光のゲインチルトが解消され、図3に示すように、各波長の信号光λ1〜λ8の全ての信号レベルが一定となる結果、光増幅部20からはゲインチルトの存在しない波長多重信号光が出力されることとなる。  At the time of the transmission, the optical multiplexing / demultiplexing device 10 receives the signal light λ1 and λ8 of the branch transmission lines 3a and 3b branched by the branching / inserting unit 30 and passes through the level signal adjusting unit 40. 40 calculates the difference Δ between the signal levels of the signal lights λ1 and λ8 of each wavelength, and adjusts the amplification degree of the optical amplifying unit 20 to absorb the calculated difference Δ, so that the optical amplifying unit 20 As shown in FIG. 3, the gain tilt of the wavelength multiplexed signal light output from the optical signal is canceled, and as a result, all signal levels of the signal lights λ1 to λ8 of each wavelength are constant. Wavelength multiplexed signal light is output.

即ち、本実施形態の光波長多重伝送システムは、光合分波装置10のレベル信号調整手段40が、分岐・挿入手段30から分岐されたそれぞれの分岐伝送路3a、3bの信号光λ1、λ8の信号レベルの大きさの差Δを求めると共に、該求めた差Δを吸収する方向に光増幅部20を調整するので、光増幅部20から出力された波長多重信号光にゲインチルトが起こるのを防止することができる。  That is, in the optical wavelength division multiplex transmission system of the present embodiment, the level signal adjusting means 40 of the optical multiplexing / demultiplexing device 10 transmits the signal lights λ1 and λ8 of the branch transmission paths 3a and 3b branched from the branch / insertion means 30. The difference Δ between the signal levels is obtained, and the optical amplifying unit 20 is adjusted in a direction to absorb the obtained difference Δ, thereby preventing the gain tilt from occurring in the wavelength multiplexed signal light output from the optical amplifying unit 20. can do.

従って、ゲインチルトを防止できるので、分岐された波長の長い信号光λ8の信号レベルが大きくなることがなくなり、受光素子が破壊されるのを防止することができるばかりでなく、波長の短い信号光λ1の信号レベルが小さくなることがなくなり、S/N比の劣化をきたして伝送品質が低下するというのを防止することもでき、安定した波長多重信号光を供給することができる。そのため、レベル信号調整手段40による自動化を実現できるので、従来のように伝送路の末端側で管理者が信号光を測定して調整を行う作業を行うことも不要になる。  Therefore, since gain tilt can be prevented, the signal level of the branched signal light λ8 having a long wavelength is not increased, and the light receiving element can be prevented from being destroyed, and the signal light λ1 having a short wavelength can be prevented. Therefore, it is possible to prevent the transmission quality from being deteriorated due to the deterioration of the S / N ratio, and the stable wavelength multiplexed signal light can be supplied. Therefore, since the level signal adjusting means 40 can be automated, it is not necessary for the administrator to measure and adjust the signal light on the end side of the transmission line as in the prior art.

また、レベル信号調整手段40は、分岐されたそれぞれ二つの波長の信号光の信号レベルの差Δを求める演算部41と、演算部41によって求めたそれぞれの信号レベルの差Δに基づき、光増幅部20の増幅度を調整させる補正部42とを有しているので、光増幅部20から出力される波長多重信号光に発生するゲインチルトを確実に吸収することができ、ゲインチルトの防止効果を良好に果たすことができる。  Further, the level signal adjustment means 40 calculates the difference Δ between the signal levels of the branched two signal lights, and the optical amplification based on the difference Δ between the signal levels obtained by the computation unit 41. Since the correction unit 42 for adjusting the amplification degree of the unit 20 is included, the gain tilt generated in the wavelength multiplexed signal light output from the optical amplification unit 20 can be absorbed reliably, and the effect of preventing gain tilt is excellent. Can be fulfilled.

そして、補正部42は、光増幅部20に対してその差Δを調整するとき、励起光源22の発光素子に対する設定温度を変え、これにより、発光素子の発振波長が変更されて光増幅部20によって増幅される波長多重信号光の信号レベルのゲインチルトを吸収させるので、光増幅部20から出力される波長多重信号光における各信号光の信号レベルを確実に一定にすることができる。  And when the correction | amendment part 42 adjusts the difference (DELTA) with respect to the optical amplification part 20, the setting temperature with respect to the light emitting element of the excitation light source 22 is changed, Thereby, the oscillation wavelength of a light emitting element is changed and the optical amplification part 20 is changed. Since the gain tilt of the signal level of the wavelength multiplexed signal light amplified by the optical amplifier is absorbed, the signal level of each signal light in the wavelength multiplexed signal light output from the optical amplifier 20 can be made constant.

更に、この光合分波装置10によれば、演算部41のモニタ部が分岐されたそれぞれの信号光λ1、λ8を検出することで、それら信号光λ1、λ8の信号レベルを正確に検出することができる。しかも、モニタ部が光カプラ43、44と光電変換素子45、46とを有することで、分岐されたそれぞれ信号光λ1、λ8の信号レベルの大きさを的確に検出することができるので、演算部41がそれぞれの信号レベルの差を正確に求めることができる。  Furthermore, according to the optical multiplexing / demultiplexing device 10, the monitor unit of the calculation unit 41 detects the respective signal lights λ1 and λ8 branched, thereby accurately detecting the signal levels of the signal lights λ1 and λ8. Can do. Moreover, since the monitor unit includes the optical couplers 43 and 44 and the photoelectric conversion elements 45 and 46, the magnitudes of the signal levels of the branched signal lights λ1 and λ8 can be accurately detected. 41 can accurately determine the difference between the signal levels.

そして、この波長多重伝送システムは、光合分波装置10を備えることで、中継局4の経年変化や伝送路3の損失変化等に拘わることなく、波長多重信号光にゲインチルトが発生するのを防止するので、安定した波長多重信号光を得ることができ、それだけ信頼性を高めることができる。  The wavelength division multiplexing transmission system includes the optical multiplexing / demultiplexing device 10 to prevent gain tilt from occurring in the wavelength division multiplexed signal light regardless of the secular change of the relay station 4 or the loss change of the transmission path 3. Therefore, stable wavelength-division multiplexed signal light can be obtained, and the reliability can be improved accordingly.

なお、図示実施の形態において、光合分波装置の分岐・挿入手段がWDMフィルタと光カプラとを用いた例を示したが、これに限らず、例えばファイバグレーティングやアレイ導波路格子等の波長分波素子を用いてもよい。また、分岐される信号光として、互いに波長の異なる二つを用いた例を示したが、三つ或いはそれ以上の信号光の場合にも同様に適用することができ、更には、最も短い波長λ1と長い波長λ8とを分岐させる例を示したが、それ以外の波長が分岐される場合にも同様に適用することができる。
そして、波長多重信号光のゲインチルトが通常一般的に発生する右肩上がりのものに適用した例を示したが、その逆の左肩上がりにゲインチルトが発生する場合にも対処することができる。
In the illustrated embodiment, an example in which the branching / insertion means of the optical multiplexer / demultiplexer uses a WDM filter and an optical coupler is shown. However, the present invention is not limited to this. For example, the wavelength splitter such as a fiber grating or an arrayed waveguide grating is used. A wave element may be used. Moreover, although the example which used two mutually different wavelengths as a branched signal light was shown, it can apply similarly also in the case of three or more signal lights, and also the shortest wavelength. Although an example in which λ1 and a long wavelength λ8 are branched has been described, the present invention can be similarly applied to cases in which other wavelengths are branched.
In addition, although an example in which the gain tilt of the wavelength multiplexed signal light is generally generated to increase in the right shoulder has been shown, it is possible to cope with the case in which the gain tilt occurs in the opposite upward direction.

発明の効果The invention's effect

以上説明したように、請求項1に係る本発明によれば、波長多重信号光が入力されると、レベル信号調整手段が、分岐・挿入手段から分岐されたそれぞれの信号光の信号レベルの大きさの差を求めると共に、該求めた差を吸収する方向に調整するように構成したので、光増幅部から出力された波長多重信号光にゲインチルトが起こるのを防止することができる結果、管理者の作業を要することなく、信号レベルに差のない安定した波長多重信号光を得ることができ、光合分波装置としての信頼性を高めることができる効果がある。  As described above, according to the first aspect of the present invention, when the wavelength multiplexed signal light is input, the level signal adjusting means has the signal level of each signal light branched from the branching / inserting means. As a result, it is possible to prevent the gain tilt from occurring in the wavelength multiplexed signal light output from the optical amplifying unit. Thus, stable wavelength-multiplexed signal light having no difference in signal level can be obtained without the necessity of this work, and the reliability as an optical multiplexing / demultiplexing device can be improved.

請求項2に係る本発明によれば、レベル信号調整手段が演算部と補正部とを備えているので、光増幅部から出力される波長多重信号光に発生するゲインチルトを確実に吸収することができ、ゲインチルトの防止効果を良好に果たすことができる効果がある。  According to the second aspect of the present invention, since the level signal adjusting means includes the calculation unit and the correction unit, it is possible to reliably absorb the gain tilt generated in the wavelength multiplexed signal light output from the optical amplification unit. Therefore, there is an effect that the effect of preventing the gain tilt can be satisfactorily achieved.

請求項3に係る本発明によれば、演算部の前記モニタ部が分岐されたそれぞれの信号光を検出することで、それぞれの信号光の信号レベルを正確に検出することができる効果がある。  According to the third aspect of the present invention, there is an effect that the signal level of each signal light can be accurately detected by detecting each signal light branched by the monitor unit of the calculation unit.

請求項4に係る本発明によれば、前記光カプラと前記光電変換素子を有し、分岐されたそれぞれの波長の信号光の信号レベルの大きさを的確に検出することができるので、演算部がそれぞれの信号レベルの差を正確に求めることができる効果がある。  According to the fourth aspect of the present invention, since the optical coupler and the photoelectric conversion element are included and the magnitude of the signal level of the branched signal light of each wavelength can be accurately detected, the arithmetic unit There is an effect that the difference between the signal levels can be accurately obtained.

請求項5に係る本発明によれば、補正部が光増幅部の励起光源に対する設定温度を、前記信号レベルの差に応じて変更させるので、光増幅部から出力される波長多重信号光における各信号光の信号レベルを確実に一定できる効果がある。  According to the fifth aspect of the present invention, the correction unit changes the set temperature for the pumping light source of the optical amplifying unit in accordance with the difference in the signal level. Therefore, each wavelength-multiplexed signal light output from the optical amplifying unit There is an effect that the signal level of the signal light can be reliably fixed.

請求項6に係る本発明によれば、光合分波装置が中継局の経年変化や伝送路の損失変化等に拘わることなく、波長多重信号光にゲインチルトが発生するのを確実に防止するので、安定した波長多重信号光を得ることができ、それだけ信頼性を高めることができるという効果がある。  According to the sixth aspect of the present invention, the optical multiplexing / demultiplexing device reliably prevents the occurrence of gain tilt in the wavelength multiplexed signal light regardless of the secular change of the relay station, the loss change of the transmission path, etc. There is an effect that stable wavelength-division multiplexed signal light can be obtained, and reliability can be improved accordingly.

本発明の第1の実施の形態に係る光合分波装置を光波長多重伝送システムに適用した図であって、光合分波装置の構成を示す説明図である。  BRIEF DESCRIPTION OF THE DRAWINGS It is the figure which applied the optical multiplexing / demultiplexing apparatus which concerns on the 1st Embodiment of this invention to the optical wavelength division multiplexing system, Comprising: It is explanatory drawing which shows the structure of an optical multiplexing / demultiplexing apparatus. 光合分波装置のレベル信号調整手段が分岐したそれぞれの信号光の信号レベルの差を求めたときの説明図である。  It is explanatory drawing when the difference of the signal level of each signal light which the level signal adjustment means of the optical multiplexing / demultiplexing device branched is calculated | required. 光合分波装置のレベル信号調整手段が光増幅部を調整したことで、光増幅部から出力された波長多重信号光を示す説明図である。  It is explanatory drawing which shows the wavelength division multiplexed signal light output from the optical amplification part because the level signal adjustment means of the optical multiplexing / demultiplexing device adjusted the optical amplification part. 光合分波装置のレベル信号調整手段のモニタ部が分岐された二つの波長の信号光の信号レベルを検出したときの説明図である。  It is explanatory drawing when the signal level of the signal light of two wavelengths branched by the monitor part of the level signal adjustment means of an optical multiplexing / demultiplexing device is detected. 一般的な波長多伝送システムを示す概略説明図である。  It is a schematic explanatory drawing which shows a general wavelength multiple transmission system. 従来の光合分波装置を示す説明図である。  It is explanatory drawing which shows the conventional optical multiplexing / demultiplexing apparatus. 波長多重信号光の信号レベルにゲインチルトが発生している状態を示す説明図である。  It is explanatory drawing which shows the state in which the gain tilt has generate | occur | produced in the signal level of wavelength multiplexing signal light.

符号の説明Explanation of symbols

3a、3b…分岐伝送路
10…光合分波装置
20…光増幅部
30…分岐・挿入手段
40…レベル信号調整手段
41…演算部
42…補正部
43、44…光カプラ
45、46…光電変換素子
3a, 3b ... branching transmission line 10 ... optical multiplexer / demultiplexer 20 ... optical amplifier 30 ... branching / inserting means 40 ... level signal adjusting means 41 ... calculating part 42 ... correcting part 43, 44 ... optical coupler 45, 46 ... photoelectric conversion element

Claims (6)

波長多重された信号光を増幅する光増幅部と、該光増幅部によって増幅された波長多重信号光のうち、少なくとも波長の異なる二種類の信号光を分岐させる一方、残りの他の波長の異なる信号光に信号光を合波させて出力する分岐・挿入手段とを備えた光合分波装置において、
前記分岐された二種類の信号光の信号レベルの差を求めと共に、該求めた差を吸収する方向に前記光増幅部を調整するレベル信号調整手段を備えたことを特徴とする光合分波装置。
An optical amplifying unit that amplifies the wavelength-multiplexed signal light, and at least two types of signal light having different wavelengths among the wavelength-multiplexed signal light amplified by the optical amplifying unit are branched while the remaining other wavelengths are different In an optical multiplexing / demultiplexing device provided with branching / insertion means for multiplexing and outputting signal light to signal light,
An optical multiplexing / demultiplexing device comprising level signal adjusting means for obtaining a difference in signal level between the two kinds of branched signal lights and adjusting the optical amplification unit in a direction to absorb the obtained difference .
請求項1記載の光合分波装置において、
前記レベル信号調整手段は、前記分岐された二種類の信号光の信号レベルの差を求める演算部と、該演算部によって求めた信号レベルの差に基づいて光増幅部の増幅度を調整する補正部とを備えていることを特徴とする光合分波装置。
The optical multiplexing / demultiplexing device according to claim 1,
The level signal adjusting means calculates a difference between signal levels of the two types of branched signal light, and a correction for adjusting the amplification degree of the optical amplification unit based on the difference between the signal levels obtained by the calculation unit And an optical multiplexing / demultiplexing device.
請求項2記載の光合分波装置において、
前記演算部は、前記分岐された二種類の信号光をそれぞれ更に分岐させて検出するモニタ部を有することを特徴とする光合分波装置。
The optical multiplexing / demultiplexing device according to claim 2,
The said calculating part has a monitoring part which further branches and detects each of the said 2 types of branched signal light, The optical multiplexing / demultiplexing apparatus characterized by the above-mentioned.
請求項3記載の光合分波装置において、
前記モニタ部は、前記分岐された二種類の信号光の分岐伝送路にそれぞれ設けられた光カプラと、該光カプラによって更に分岐されたそれぞれの信号光を光電変換する光電変換素子とからなることを特徴とする光合分波装置。
The optical multiplexing / demultiplexing device according to claim 3,
The monitor unit includes an optical coupler provided in each of the branched transmission paths of the two types of branched signal light, and a photoelectric conversion element that photoelectrically converts each signal light further branched by the optical coupler. An optical multiplexing / demultiplexing device.
請求項2から4のいずれか記載の光合分波装置において、
前記補正部は、前記光増幅部の励起光源に対する設定温度を、前記信号レベルの差に応じて変更させることを特徴とする光合分波装置。
In the optical multiplexing / demultiplexing device according to any one of claims 2 to 4,
The correction unit changes a set temperature of the optical amplification unit with respect to the excitation light source according to the difference in the signal level.
請求項1から5のいずれか記載の光合分波装置を備えていることを特徴とする光波長多重伝送システム。  An optical wavelength division multiplexing transmission system comprising the optical multiplexing / demultiplexing device according to claim 1.
JP2003309375A 2003-07-30 2003-07-30 Optical multiplexing/demultiplexing apparatus, and optical wavelength multiplexing transmission system Pending JP2005051189A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013229643A (en) * 2012-04-24 2013-11-07 Sumitomo Electric Ind Ltd Optical transmission/reception device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013229643A (en) * 2012-04-24 2013-11-07 Sumitomo Electric Ind Ltd Optical transmission/reception device

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