JPH0621897A - WDM optical amplification repeater transmission system and optical amplification repeater - Google Patents
WDM optical amplification repeater transmission system and optical amplification repeaterInfo
- Publication number
- JPH0621897A JPH0621897A JP4174416A JP17441692A JPH0621897A JP H0621897 A JPH0621897 A JP H0621897A JP 4174416 A JP4174416 A JP 4174416A JP 17441692 A JP17441692 A JP 17441692A JP H0621897 A JPH0621897 A JP H0621897A
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- wavelength
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- multiplexed
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Abstract
(57)【要約】
【目的】 波長多重された光伝送信号を一括して光増幅
中継する波長多重光増幅中継伝送システムおよびその光
伝送路内で光増幅中継を行う光増幅中継器に関し、波長
多重数の変更あるいはルート変更があっても光増幅中継
器で自動的に適正な光出力レベルを設定できることを目
的とする。
【構成】 光伝送信号送信端には、多重される各々の波
長の光伝送信号にそれぞれ周波数が異なる制御信号を重
畳して送出する制御信号重畳手段を備え、各光増幅中継
器には、波長多重数に応じて設定する基準レベルと、各
周波数の制御信号を一括受信して得られる総電力とを比
較して光出力レベルを制御する制御手段を備えて構成す
る。
(57) [Abstract] [Purpose] A wavelength-multiplexed optical amplification repeater transmission system for collectively amplifying and repeating wavelength-multiplexed optical transmission signals and an optical amplification repeater for performing optical amplification repeater in the optical transmission line The objective is to be able to automatically set an appropriate optical output level in the optical amplification repeater even if the number of multiplexed signals or the route is changed. The optical transmission signal transmitting end is provided with control signal superimposing means for superimposing a control signal having a different frequency on an optical transmission signal of each wavelength to be multiplexed and transmitting the control signal. The control unit controls the optical output level by comparing the reference level set according to the number of multiplexed signals with the total power obtained by collectively receiving the control signals of each frequency.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、波長多重された光伝送
信号を一括して光増幅中継する波長多重光増幅中継伝送
システムおよびその光伝送路内で光増幅中継を行う光増
幅中継器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wavelength-multiplexed optical amplification repeater transmission system for collectively amplifying and repeating wavelength-multiplexed optical transmission signals and an optical amplification repeater for performing optical amplification repeater in the optical transmission line. .
【０００２】[0002]
【従来の技術】図５は、従来の光増幅中継伝送システム
の基本構成を示すブロック図である。図において、端局
の変調器５１は、信号源５２から出力される波長λ1 の
光伝送信号に、制御信号発生回路５３から出力される周
波数ｆ1 の制御信号を重畳して光伝送路５４に送出す
る。この制御信号を含む光伝送信号は、光伝送路５４お
よび複数の光増幅中継器５５を介して受信装置５６まで
伝送される。2. Description of the Related Art FIG. 5 is a block diagram showing a basic configuration of a conventional optical amplification repeater transmission system. In the figure, the modulator 51 of the terminal station superimposes the control signal of the frequency f 1 output from the control signal generation circuit 53 on the optical transmission signal of the wavelength λ 1 output from the signal source 52, and transmits the optical transmission line 54. Send to. The optical transmission signal including the control signal is transmitted to the receiving device 56 via the optical transmission line 54 and the plurality of optical amplification repeaters 55.
【０００３】なお、周波数ｆ1 の制御信号は、各光増幅
中継器５５の光出力レベルを一定にする制御処理に用い
られる。ここで、従来の光増幅中継器５５の構成例を図
６に示す。The control signal of the frequency f 1 is used in the control processing for keeping the optical output level of each optical amplification repeater 55 constant. Here, a configuration example of the conventional optical amplification repeater 55 is shown in FIG.
【０００４】図６において、分岐回路６１が光増幅中継
器の出力光の一部を分岐し、光・電気変換器（Ｏ／Ｅ）
６２で電気信号に変換する。狭帯域フィルタ６３はこの
電気信号から伝送信号に重畳されている周波数ｆ1 の制
御信号を抽出し、比較器６４はこの制御信号レベルと基
準レベル発生器６５が出力する基準レベルとを比較す
る。光出力制御部６６は、比較器６４の比較出力に応じ
て光増幅器６０の励起光レベルを制御し、光増幅中継器
５５の光出力レベルが一定になるように制御する。In FIG. 6, a branch circuit 61 branches a part of the output light of the optical amplification repeater, and an optical / electrical converter (O / E) is provided.
At 62, it is converted into an electric signal. The narrow band filter 63 extracts the control signal of the frequency f 1 superimposed on the transmission signal from this electric signal, and the comparator 64 compares this control signal level with the reference level output by the reference level generator 65. The optical output control unit 66 controls the pumping light level of the optical amplifier 60 according to the comparison output of the comparator 64, and controls so that the optical output level of the optical amplification repeater 55 becomes constant.
【０００５】図７は、波長多重された光伝送信号を一括
して光増幅中継する従来の波長多重光増幅中継伝送シス
テムの基本構成を示すブロック図である。なお、ここで
は４波長多重のシステム構成について示す。FIG. 7 is a block diagram showing the basic configuration of a conventional wavelength-multiplexed optical amplification relay transmission system for collectively amplifying and relaying wavelength-multiplexed optical transmission signals. In addition, here, a system configuration of four wavelength multiplexing is shown.
【０００６】図において、信号源５２1 〜５２4 から出
力される波長λ1 〜λ4 の光伝送信号は、合波器５７で
４波長多重して光伝送路５４に送出される。４波長多重
した光伝送信号は、光伝送路５４および複数の光増幅中
継器５５を介して受信装置５６まで伝送される。なお、
各光増幅中継器の光出力レベルを一定にする制御のため
に、ここでは変調器５１において波長λ1 の光伝送信号
に周波数ｆ1 の制御信号が重畳される。[0006] In Figure, the optical transmission signals of wavelengths lambda 1 to [lambda] 4 output from the signal source 52 1 to 52 4, by the multiplexer 57 4 wavelength-multiplexed are sent to the optical transmission line 54. The four-wavelength multiplexed optical transmission signal is transmitted to the receiving device 56 via the optical transmission line 54 and the plurality of optical amplification repeaters 55. In addition,
In order to control the optical output level of each optical amplification repeater to be constant, the control signal of frequency f 1 is superimposed on the optical transmission signal of wavelength λ 1 in the modulator 51.
【０００７】また、図７に示す構成では、光伝送路５４
の途中に分岐装置５８が配置され、２つの光伝送路５４
1 ，５４2 に分岐してそれぞれの受信装置５６1 ，５６
2 まで伝送される。たとえば、分岐装置５８では、波長
λ1 ，λ2 の光伝送信号を光伝送路５４1 方向に分岐
し、波長λ3 ，λ4 の光伝送信号を光伝送路５４2 方向
に分岐する。このとき、光伝送路５４2 に挿入される光
増幅中継器５５では、波長λ3 ，λ4 の光伝送信号に制
御信号が重畳されていないので、図６に示す光増幅中継
器の構成では光出力レベルの制御はできない。したがっ
て、各光増幅中継器５５で制御信号が抽出できるよう
に、各系統に分岐される光伝送信号の少なくとも１つに
それぞれ制御信号を重畳させる必要があった。図７に示
す例では、波長λ1 の光伝送信号に周波数ｆ1 の制御信
号を重畳するとともに、波長λ3 の光伝送信号に周波数
ｆ3 の制御信号を重畳することになる。Further, in the configuration shown in FIG. 7, the optical transmission line 54
A branching device 58 is disposed in the middle of the two optical transmission lines 54
1 and 54 2 are branched to receive devices 56 1 and 56, respectively.
Up to 2 transmitted. For example, in the branching device 58, the optical transmission signals having the wavelengths λ 1 and λ 2 are branched in the optical transmission line 54 1 direction, and the optical transmission signals having the wavelengths λ 3 and λ 4 are branched in the optical transmission line 54 2 direction. At this time, in the optical amplification repeater 55 inserted into the optical transmission line 54 2 , since the control signal is not superimposed on the optical transmission signals of wavelengths λ 3 and λ 4 , the configuration of the optical amplification repeater shown in FIG. The light output level cannot be controlled. Therefore, it is necessary to superimpose the control signal on at least one of the optical transmission signals branched into each system so that each optical amplification repeater 55 can extract the control signal. In the example shown in FIG. 7, with superimposed control signals of the frequency f 1 to the optical transmission signal of the wavelength lambda 1, so that superimposing a control signal of frequency f 3 to the optical transmission signal of the wavelength lambda 3.
【０００８】[0008]
【発明が解決しようとする課題】ところで、図７に示す
構成において、特定波長の光伝送信号のルートが変更に
なった場合には、それに応じて制御信号の重畳先を変更
しなけれはならないことがある。しかし、その都度光伝
送信号と制御信号との組み合わせを変更することは容易
ではない。By the way, in the configuration shown in FIG. 7, when the route of the optical transmission signal of a specific wavelength is changed, the superimposing destination of the control signal must be changed accordingly. There is. However, it is not easy to change the combination of the optical transmission signal and the control signal each time.
【０００９】また、一般的に波長多重数の異なる中継伝
送系において、各中継間隔で所要のＳＮ比を維持するた
めには、光出力レベルを各波長に対して適正な値に制御
する必要がある。しかし、従来技術では波長多重信号に
対して一括した光増幅を行っており、各波長ごとに光出
力レベルを制御する手段はなかった。In general, in a repeater transmission system with different number of wavelength division multiplexing, in order to maintain a required SN ratio at each repeat interval, it is necessary to control the optical output level to an appropriate value for each wavelength. is there. However, in the prior art, optical amplification is collectively performed on wavelength-multiplexed signals, and there is no means for controlling the optical output level for each wavelength.
【００１０】本発明は、波長多重数の変更あるいはルー
ト変更があっても光増幅中継器で自動的に適正な光出力
レベルを設定することができる波長多重光増幅中継伝送
システムおよび光増幅中継器を提供することを目的とす
る。The present invention provides a wavelength-division multiplex optical amplification repeater transmission system and an optical amplification repeater capable of automatically setting an appropriate optical output level in the optical amplification repeater even if the number of wavelength division multiplexes or the route is changed. The purpose is to provide.
【００１１】[0011]
【課題を解決するための手段】請求項１に記載の発明
は、波長多重された光伝送信号を光増幅中継する波長多
重光増幅中継伝送システムにおいて、光伝送信号送信端
には、多重される各々の波長の光伝送信号にそれぞれ周
波数が異なる制御信号を重畳して送出する制御信号重畳
手段を備え、各光増幅中継器には、波長多重数に応じて
設定する基準レベルと、各周波数の制御信号を一括受信
して得られる総電力とを比較して光出力レベルを制御す
る制御手段を備えたことを特徴とする。According to a first aspect of the present invention, in a wavelength-multiplexed optical amplification relay transmission system for optically amplifying and relaying a wavelength-multiplexed optical transmission signal, an optical transmission signal transmission end is multiplexed. Each optical amplification repeater is provided with a control signal superimposing unit that superimposes a control signal having a different frequency on the optical transmission signal of each wavelength and sends the control signal. It is characterized by further comprising control means for controlling the optical output level by comparing the total electric power obtained by receiving the control signals all together.
【００１２】請求項２に記載の発明は、各々異なる周波
数の制御信号が重畳され、さらに波長多重された光伝送
信号を光増幅中継する光増幅中継器において、波長多重
された光伝送信号の波長多重数を計数し、その波長多重
数に応じた基準レベルを設定する基準レベル設定手段
と、各周波数の制御信号を一括受信して得られる総電力
を検出し、基準レベルと比較して光出力レベルを制御す
るレベル制御手段とを備えたことを特徴とする。According to a second aspect of the present invention, in the optical amplification repeater for superposing control signals of different frequencies, and for optically amplifying and repeating the wavelength-multiplexed optical transmission signal, the wavelength of the wavelength-multiplexed optical transmission signal is transmitted. Reference level setting means for counting the number of multiplexes and setting a reference level according to the number of multiplexed wavelengths, and total power obtained by collectively receiving control signals of each frequency are detected and compared with the reference level to output light. And level control means for controlling the level.
【００１３】請求項３に記載の発明は、波長多重された
光伝送信号を光増幅中継する波長多重光増幅中継伝送シ
ステムにおいて、光伝送信号送信端には、多重される各
々の波長の光伝送信号にそれぞれ周波数が異なる制御信
号を重畳して送出する制御信号重畳手段を備え、各光増
幅中継器には、波長ごとの制御信号レベルに応じて設定
する基準レベルと、各周波数の制御信号を一括受信して
得られる総電力とを比較して光出力レベルを制御する制
御手段を備えたことを特徴とする。According to a third aspect of the present invention, in a wavelength-multiplexed optical amplification repeater transmission system for optically amplifying and repeating wavelength-multiplexed optical transmission signals, an optical transmission of each wavelength to be multiplexed is provided at an optical transmission signal transmission end. Each optical amplification repeater is provided with a control signal superimposing means for superimposing a control signal having a different frequency on the signal and transmitting the control signal, and a control signal for each frequency and a reference level set according to the control signal level for each wavelength. It is characterized by further comprising control means for controlling the optical output level by comparing with the total power obtained by batch reception.
【００１４】請求項４に記載の発明は、各々異なる周波
数の制御信号が重畳され、さらに波長多重された光伝送
信号を光増幅中継する光増幅中継器において、波長多重
された光伝送信号の各波長ごとの制御信号レベルを検出
し、それぞれの制御信号レベルに応じた基準レベルを設
定する基準レベル設定手段と、各周波数の制御信号を一
括受信して得られる総電力を検出し、基準レベルと比較
して光出力レベルを制御するレベル制御手段とを備えた
ことを特徴とする。According to a fourth aspect of the present invention, in an optical amplification repeater in which control signals of different frequencies are superposed on each other, and the wavelength-multiplexed optical transmission signal is optically amplified and relayed, each wavelength-multiplexed optical transmission signal is transmitted. Reference level setting means for detecting a control signal level for each wavelength and setting a reference level according to each control signal level, and total power obtained by collectively receiving control signals of each frequency are detected as a reference level. And a level control means for controlling the light output level for comparison.
【００１５】[0015]
【作用】本発明は、多重するすべての波長の光伝送信号
にそれぞれ異なる周波数を有する制御信号を重畳して伝
送することにより、信号波長単位で伝送経路が変更にな
っても各光伝送信号には必ず制御信号が含まれているの
で、各光増幅中継器で光出力レベルの制御を支障なく行
うことができる。The present invention superimposes and transmits control signals having different frequencies on the optical transmission signals of all wavelengths to be multiplexed, so that even if the transmission path is changed in signal wavelength units, each optical transmission signal is Since the control signal is always included, each optical amplifier repeater can control the optical output level without any trouble.
【００１６】請求項１および請求項２に記載の発明で
は、さらに波長多重数に応じた基準レベルを設定し、各
周波数の制御信号を一括受信して得られる総電力と基準
レベルとを比較して光出力レベルの制御を行うことによ
り、波長多重数が変更になっても自動的に適正な光出力
レベルに制御することができる。According to the first and second aspects of the present invention, a reference level corresponding to the number of wavelength division multiplex is further set, and the total power obtained by collectively receiving the control signals of each frequency is compared with the reference level. By controlling the optical output level in accordance with the above, it is possible to automatically control to an appropriate optical output level even if the number of wavelength division multiplexes is changed.
【００１７】請求項３および請求項４に記載の発明で
は、さらに波長ごとの制御信号レベルを検出して各レベ
ルに応じた基準レベルを設定し、各周波数の制御信号を
一括受信して得られる総電力と基準レベルとを比較して
光出力レベルの制御を行うことにより、光増幅器の利得
特性に波長依存性がある場合でも自動的に適正な光出力
レベルに制御することができる。According to the third and fourth aspects of the present invention, the control signal level for each wavelength is further detected, the reference level corresponding to each level is set, and the control signals of each frequency are collectively received. By controlling the optical output level by comparing the total power with the reference level, it is possible to automatically control the optical output level to an appropriate level even when the gain characteristic of the optical amplifier has wavelength dependency.
【００１８】[0018]
【実施例】図１は、本発明の波長多重光増幅中継伝送シ
ステムの基本構成を示すブロック図である。なお、ここ
では４波長多重のシステム構成について示す。1 is a block diagram showing the basic configuration of a wavelength division multiplexing optical amplifier repeater transmission system according to the present invention. In addition, here, a system configuration of four wavelength multiplexing is shown.
【００１９】図において、端局の変調器５１1 〜５１4
は、各信号源５２1 〜５２4 から出力される波長λ1 〜
λ4 の光伝送信号に、制御信号発生回路５３1 〜５３4
から出力される周波数ｆ1 〜ｆ4 の制御信号をそれぞれ
重畳し、合波器５７で４波長多重して光伝送路５４に送
出する。４波長多重した光伝送信号は、光伝送路５４お
よび複数の光増幅中継器１０を介して分岐装置５８に入
力され、そこで２分岐されて各光伝送路５４1 ，５４2
および複数の光増幅中継器１０を介して受信装置５
６1 ，５６2 まで伝送される。このように、すべての光
伝送信号に制御信号を重畳させることにより、分岐装置
５８て分岐される波長がどのようなパターンであって
も、各光増幅中継器１０では各光伝送信号から制御信号
を抽出して光出力レベルを制御することができる。In the figure, modulators 51 1 to 51 4 of the terminal stations are shown.
Is the wavelength lambda 1 ~ output from the signal source 52 1 to 52 4
For the optical transmission signal of λ 4 , control signal generation circuits 53 1 to 53 4
The control signals of the frequencies f 1 to f 4 output from the respective units are superposed on each other, multiplexed by the multiplexer 57 for four wavelengths, and transmitted to the optical transmission line 54. The four-wavelength-multiplexed optical transmission signal is input to the branching device 58 via the optical transmission line 54 and the plurality of optical amplification repeaters 10, and is branched into two at each branching optical transmission line 54 1 , 54 2.
And the receiving device 5 via the plurality of optical amplification repeaters 10.
Up to 6 1 , 56 2 are transmitted. In this way, by superimposing the control signals on all the optical transmission signals, no matter what the wavelength of the wavelengths branched by the branching device 58 is, the optical amplifier repeaters 10 can control the control signals from the optical transmission signals. Can be extracted to control the light output level.
【００２０】図２は、本発明の波長多重光増幅中継伝送
システムに用いられる光増幅中継器１０の実施例構成を
示すブロック図である。図において、分岐回路６１が光
増幅中継器の出力光の一部を分岐し、さらに分岐回路２
１で２分岐した一方を光・電気変換器（Ｏ／Ｅ）６２に
入力して電気信号に変換する。広帯域フィルタ２２はこ
の電気信号から伝送信号に重畳されている複数の周波数
の制御信号を一括抽出する。また、分岐回路２１で２分
岐した他方の光伝送信号は、分波器２３を介して各波長
ごとに分波され、波数計数器２４に入力されて多重波長
数が計数される。基準レベル発生器２５は、波数計数器
２４で検出された多重波長数の情報に応じて基準レベル
を決定し比較器６４に与える。比較器６４は広帯域フィ
ルタ２２を通過した制御信号レベルと、基準レベル発生
器２４が出力する基準レベルとを比較する。光出力制御
部６６は、比較器６４の比較出力に応じて光増幅器６０
の励起光レベルを制御し、光増幅中継器１０の光出力レ
ベルが一定になるように制御する。FIG. 2 is a block diagram showing the configuration of an embodiment of the optical amplification repeater 10 used in the wavelength division multiplexing optical amplification repeater transmission system of the present invention. In the figure, a branch circuit 61 branches a part of the output light of the optical amplification repeater, and a branch circuit 2
One of the two branched at 1 is input to an optical / electrical converter (O / E) 62 and converted into an electrical signal. The wide band filter 22 collectively extracts control signals of a plurality of frequencies superimposed on the transmission signal from this electric signal. The other optical transmission signal branched into two by the branching circuit 21 is demultiplexed for each wavelength via the demultiplexer 23, input to the wave number counter 24, and the number of multiplexed wavelengths is counted. The reference level generator 25 determines the reference level according to the information on the number of multiplexed wavelengths detected by the wave number counter 24 and supplies the reference level to the comparator 64. The comparator 64 compares the control signal level passed through the wide band filter 22 with the reference level output from the reference level generator 24. The optical output control unit 66, the optical amplifier 60 according to the comparison output of the comparator 64.
Is controlled so that the optical output level of the optical amplification repeater 10 becomes constant.
【００２１】このように、すべての波長信号に制御信号
を重畳し、広帯域フィルタ２２を用いて複数の周波数の
制御信号を一括受信し、さらに分波器２３および波数計
数器２４を用いて多重波長数の情報に応じた光出力レベ
ル制御を可能とすることにより、信号波長単位で伝送経
路を変更するなどの制御を行っても、制御信号の有無や
多重波長の組み合わせなどを考慮する必要がなくなる。
また、各光増幅中継器１０では使用する波長域と波数の
最大値を予め設定しておけば、すべての光増幅中継器を
同一の構成とすることができる。In this way, the control signals are superimposed on all the wavelength signals, the control signals of a plurality of frequencies are collectively received by using the wide band filter 22, and the wavelength division multiplexer 23 and the wave number counter 24 are used to multiplex the wavelengths. By making it possible to control the optical output level according to the number information, it is not necessary to consider the presence or absence of a control signal or the combination of multiple wavelengths, even when performing control such as changing the transmission path in signal wavelength units. .
Further, if the wavelength band to be used and the maximum value of the wave number are preset in each optical amplification repeater 10, all the optical amplification repeaters can have the same configuration.
【００２２】図３は、請求項２に記載の光増幅中継器に
用いられる波数計数器２４の実施例構成を示すブロック
図である。図において、分波器２３で分波された制御信
号を含む各波長の光伝送信号は、それぞれホトダイオー
ド等の光検出器３１1 〜３１4 に入力されて電気信号に
変換される。各電気信号は、帯域通過フィルタ（ＢＰ
Ｆ）３２1 〜３２4 を介してそれぞれ対応する制御信号
が抽出され、加算器３３に与えられる。加算器３３は、
制御信号の入力数、すなわち多重波長数に応じた出力信
号を送出する。FIG. 3 is a block diagram showing the configuration of an embodiment of the wave number counter 24 used in the optical amplification repeater according to the second aspect. In the figure, the optical transmission signals of each wavelength including the control signal demultiplexed by the demultiplexer 23 are input to photodetectors 31 1 to 31 4 such as photodiodes and converted into electrical signals. Each electric signal is a band pass filter (BP
F) Corresponding control signals are extracted via 32 1 to 32 4 and given to the adder 33. The adder 33 is
An output signal corresponding to the number of input control signals, that is, the number of multiplexed wavelengths is transmitted.
【００２３】図４は、請求項４に記載の光増幅中継器に
用いられる波数計数器２４の実施例構成を示すブロック
図である。図において、分波器２３で分波された制御信
号を含む各波長の光伝送信号は、それぞれホトダイオー
ド等の光検出器３１1 〜３１4 に入力されて電気信号に
変換される。各電気信号は、帯域通過フィルタ（ＢＰ
Ｆ）３２1 〜３２4 を介してそれぞれ対応する制御信号
が抽出され、電力検出器４１1 〜４１4 に入力される。
各電力検出器４１1 〜４１4 で検出された各波長対応の
制御信号電力は、それぞれ電力比較器４２1 〜４２4 で
基準電力発生器４３から与えられる基準電力と比較さ
れ、それぞれ波長間のレベル差が検出される。加算器４
４は、各波長間の基準電力に対する制御信号電力のレベ
ル差を加算して出力する。FIG. 4 is a block diagram showing the configuration of an embodiment of the wave number counter 24 used in the optical amplification repeater according to the fourth aspect. In the figure, the optical transmission signals of each wavelength including the control signal demultiplexed by the demultiplexer 23 are input to photodetectors 31 1 to 31 4 such as photodiodes and converted into electrical signals. Each electric signal is a band pass filter (BP
F) Corresponding control signals are extracted via 32 1 to 32 4 and input to the power detectors 41 1 to 41 4 .
The control signal powers corresponding to the respective wavelengths detected by the respective power detectors 41 1 to 41 4 are compared with the reference power given from the reference power generator 43 by the power comparators 42 1 to 42 4 , respectively, and the wavelengths between the wavelengths are compared. The level difference is detected. Adder 4
4 adds and outputs the level difference of the control signal power with respect to the reference power between the respective wavelengths.
【００２４】なお、基準レベル発生器２５に対しては、
レベル差の加算出力が最小となるように制御することに
より、光増幅中継器１０における波長間の利得差を考慮
した光出力レベル制御を実現することができる。すなわ
ち、光増幅中継器の利得特性に波長依存性がある場合で
も、波長多重された各信号レベルに基づいて光増幅器６
０の光出力レベルを制御することにより、波長間の利得
差による伝送品質の劣化を軽減することができる。For the reference level generator 25,
By controlling so that the added output of the level difference is minimized, the optical output level control in consideration of the gain difference between the wavelengths in the optical amplification repeater 10 can be realized. That is, even if the gain characteristics of the optical amplification repeater have wavelength dependence, the optical amplifier 6 is based on the wavelength-multiplexed signal levels.
By controlling the optical output level of 0, the deterioration of the transmission quality due to the gain difference between the wavelengths can be reduced.
【００２５】[0025]
【発明の効果】以上説明したように本発明は、多重する
すべての波長の光伝送信号にそれぞれ異なる周波数を有
する制御信号を重畳して伝送しているので、信号波長単
位で伝送経路が変更になっても、各光増幅中継器で制御
信号を用いた光出力レベルの制御を支障なく行うことが
できる。As described above, according to the present invention, the control signals having different frequencies are superimposed on the optical transmission signals of all the wavelengths to be multiplexed and transmitted, so that the transmission path can be changed for each signal wavelength. Even so, the control of the optical output level using the control signal can be performed in each optical amplification repeater without any trouble.
【００２６】また、波長多重数が変更になっても自動的
に適正な光出力レベルに制御することができるので、光
増幅中継器を構成する光増幅器を取り替えたり、動作状
態を設定し直したりする必要がなく、効率的な波長多重
伝送を可能とすることができる。Further, even if the number of wavelength division multiplexes is changed, it is possible to automatically control to an appropriate optical output level, so that the optical amplifier constituting the optical amplification repeater can be replaced or the operating state can be reset. It is possible to perform efficient wavelength division multiplexing transmission without the need for
【００２７】また、光増幅器の利得特性に波長依存性が
ある場合でも自動的に適正な光出力レベルに制御するこ
とができるので、波長間の利得差による伝送品質の劣化
を最小限に抑えることができる。Further, even when the gain characteristic of the optical amplifier has wavelength dependency, it is possible to automatically control the optical output level to an appropriate level, so that the deterioration of the transmission quality due to the gain difference between the wavelengths can be minimized. You can
【図１】本発明の波長多重光増幅中継伝送システムの基
本構成を示すブロック図。FIG. 1 is a block diagram showing a basic configuration of a wavelength division multiplexing optical amplification relay transmission system of the present invention.
【図２】本発明の波長多重光増幅中継伝送システムに用
いられる光増幅中継器１０の実施例構成を示すブロック
図。FIG. 2 is a block diagram showing the configuration of an embodiment of an optical amplification repeater 10 used in the wavelength division multiplexing optical amplification repeater transmission system of the present invention.
【図３】請求項２に記載の光増幅中継器に用いられる波
数計数器２４の実施例構成を示すブロック図。FIG. 3 is a block diagram showing an embodiment configuration of a wave number counter 24 used in the optical amplification repeater according to claim 2.
【図４】請求項４に記載の光増幅中継器に用いられる波
数計数器２４の実施例構成を示すブロック図。FIG. 4 is a block diagram showing the configuration of an embodiment of a wave number counter 24 used in the optical amplification repeater according to claim 4.
【図５】従来の光増幅中継伝送システムの基本構成を示
すブロック図。FIG. 5 is a block diagram showing a basic configuration of a conventional optical amplification repeater transmission system.
【図６】従来の光増幅中継器５５の構成例を示すブロッ
ク図。FIG. 6 is a block diagram showing a configuration example of a conventional optical amplification repeater 55.
【図７】従来の波長多重光増幅中継伝送システムの基本
構成を示すブロック図。FIG. 7 is a block diagram showing a basic configuration of a conventional wavelength division multiplexing optical amplification repeater transmission system.
１０ 光増幅中継器 ２１ 分岐回路 ２２ 広帯域フィルタ ２３ 分波器 ２４ 波数計数器 ２５ 基準レベル発生器 ３１ 光検出器 ３２ 帯域通過フィルタ（ＢＰＦ） ３３ 加算器 ４１ 電力検出器 ４２ 電力比較器 ４３ 基準電力発生器 ４４ 加算器 ５１ 変調器 ５２ 信号源 ５３ 制御信号発生回路 ５４ 光伝送路 ５５ 光増幅中継器 ５６ 受信装置 ５７ 合波器 ５８ 分岐装置 ６０ 光増幅器 ６１ 分岐回路 ６２ 光・電気変換器（Ｏ／Ｅ） ６３ 狭帯域フィルタ ６４ 比較器 ６５ 基準レベル発生器 ６６ 光出力制御部 10 Optical amplification repeater 21 Branch circuit 22 Wideband filter 23 Demultiplexer 24 Wavenumber counter 25 Reference level generator 31 Photodetector 32 Bandpass filter (BPF) 33 Adder 41 Power detector 42 Power comparator 43 Reference power generation Device 44 Adder 51 Modulator 52 Signal source 53 Control signal generation circuit 54 Optical transmission line 55 Optical amplification repeater 56 Receiver 57 Combiner 58 Branching device 60 Optical amplifier 61 Branching circuit 62 Optical / electrical converter (O / E) ) 63 narrow band filter 64 comparator 65 reference level generator 66 optical output control unit
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０４Ｊ 14/02 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI technical display location H04J 14/02
Claims (4)
する波長多重光増幅中継伝送システムにおいて、 光伝送信号送信端には、多重される各々の波長の光伝送
信号にそれぞれ周波数が異なる制御信号を重畳して送出
する制御信号重畳手段を備え、 各光増幅中継器には、波長多重数に応じて設定する基準
レベルと、前記各周波数の制御信号を一括受信して得ら
れる総電力とを比較して光出力レベルを制御する制御手
段を備えたことを特徴とする波長多重光増幅中継伝送シ
ステム。1. A wavelength-multiplexed optical amplification relay transmission system for optically amplifying and repeating a wavelength-multiplexed optical transmission signal, wherein the optical transmission signal transmitting end has a control for different frequencies for the optical transmission signals of respective wavelengths to be multiplexed. Each optical amplification repeater is provided with a control signal superimposing means for superimposing and transmitting a signal, and a reference level to be set according to the number of wavelength division multiplexing, and a total power obtained by collectively receiving the control signals of the respective frequencies. A wavelength-multiplexed optical amplification repeater transmission system comprising control means for comparing the optical output levels with each other.
れ、さらに波長多重された光伝送信号を光増幅中継する
光増幅中継器において、 前記波長多重された光伝送信号の波長多重数を計数し、
その波長多重数に応じた基準レベルを設定する基準レベ
ル設定手段と、 前記各周波数の制御信号を一括受信して得られる総電力
を検出し、前記基準レベルと比較して光出力レベルを制
御するレベル制御手段とを備えたことを特徴とする光増
幅中継器。2. An optical amplification repeater for superimposing control signals of different frequencies and for optically amplifying and repeating wavelength-multiplexed optical transmission signals, wherein the number of wavelength-multiplexed optical transmission signals is counted,
Reference level setting means for setting a reference level according to the number of wavelength division multiplexing, and total power obtained by collectively receiving the control signals of each frequency are detected, and the optical output level is controlled by comparing with the reference level. An optical amplification repeater comprising a level control means.
する波長多重光増幅中継伝送システムにおいて、 光伝送信号送信端には、多重される各々の波長の光伝送
信号にそれぞれ周波数が異なる制御信号を重畳して送出
する制御信号重畳手段を備え、 各光増幅中継器には、波長ごとの制御信号レベルに応じ
て設定する基準レベルと、前記各周波数の制御信号を一
括受信して得られる総電力とを比較して光出力レベルを
制御する制御手段を備えたことを特徴とする波長多重光
増幅中継伝送システム。3. A wavelength-multiplexed optical amplification relay transmission system for optically amplifying and relaying a wavelength-multiplexed optical transmission signal, wherein the optical transmission signal transmitting end has a control in which frequencies are different for the optical transmission signals of respective wavelengths to be multiplexed. A control signal superimposing means for superimposing and transmitting a signal is provided, and each optical amplification repeater is obtained by collectively receiving the reference level set according to the control signal level for each wavelength and the control signal of each frequency. A wavelength-division-multiplexed optical amplifier repeater transmission system comprising control means for comparing the total power and controlling the optical output level.
れ、さらに波長多重された光伝送信号を光増幅中継する
光増幅中継器において、 前記波長多重された光伝送信号の各波長ごとの制御信号
レベルを検出し、それぞれの制御信号レベルに応じた基
準レベルを設定する基準レベル設定手段と、 前記各周波数の制御信号を一括受信して得られる総電力
を検出し、前記基準レベルと比較して光出力レベルを制
御するレベル制御手段とを備えたことを特徴とする光増
幅中継器。4. An optical amplification repeater for superposing control signals of different frequencies and for optically amplifying and repeating wavelength-multiplexed optical transmission signals, the control signal level for each wavelength of the wavelength-multiplexed optical transmission signals. And a reference level setting means for setting a reference level according to each control signal level, and a total power obtained by collectively receiving the control signals of the respective frequencies is detected and compared with the reference level to obtain an optical signal. An optical amplifying repeater, comprising: a level control means for controlling an output level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4174416A JPH0621897A (en) | 1992-07-01 | 1992-07-01 | WDM optical amplification repeater transmission system and optical amplification repeater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4174416A JPH0621897A (en) | 1992-07-01 | 1992-07-01 | WDM optical amplification repeater transmission system and optical amplification repeater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0621897A true JPH0621897A (en) | 1994-01-28 |
Family
ID=15978174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4174416A Pending JPH0621897A (en) | 1992-07-01 | 1992-07-01 | WDM optical amplification repeater transmission system and optical amplification repeater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0621897A (en) |
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