JPH05327662A - Wavelength multiplex light source - Google Patents

Wavelength multiplex light source

Info

Publication number
JPH05327662A
JPH05327662A JP13214892A JP13214892A JPH05327662A JP H05327662 A JPH05327662 A JP H05327662A JP 13214892 A JP13214892 A JP 13214892A JP 13214892 A JP13214892 A JP 13214892A JP H05327662 A JPH05327662 A JP H05327662A
Authority
JP
Grant status
Application
Patent type
Prior art keywords
signal
light
output
optical
wavelength
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.)
Pending
Application number
JP13214892A
Other languages
Japanese (ja)
Inventor
Manabu Tanabe
学 田辺
Original Assignee
Matsushita Electric Ind Co Ltd
松下電器産業株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J14/00Optical multiplex systems
    • H04J14/02Wavelength-division multiplex systems
    • H04J14/0221Power control, e.g. to keep the total optical power constant

Abstract

PURPOSE: To obtain a desired stable wavelength multiplex light by monitoring a level of an optical output of an optical amplifier with a wavelength of a light source of each signal by a frequency of a pilot signal so as to adjust output power of the signal light source.
CONSTITUTION: A signal light from signal light sources 101-103 is a wavelength multiplex light by an optical synthesizer 104 and amplified altogether by an optical amplifier 106. Then the wavelength multiplex light is branched by an optical branch device 108 from an output light of the optical amplifier 106, and only the light with signal light source output wavelengths λ1, λ2...λn is extracted from the branched wavelength multiplex light by narrow band pass filters 109-111 and its level is monitored by output light monitor means 112-114. Control means 115-117 control a signal light output of relevant signal light sources 101-103 in response to the output of the means 112-114 by monitoring the output increased/decreased depending on each quantity of the optical output whose wavelengths are λ1, λ2...λn from the optical amplifier 106. Thus, even when the structure or the state of the optical amplifier is changed, the output light is kept to a desired quantity.
COPYRIGHT: (C)1993,JPO&Japio

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【産業上の利用分野】本発明は、光通信に使用する光増幅器を用いた波長多重光伝送するための光源に関するものである。 The present invention relates to relates to a light source for wavelength-multiplexing optical transmission using an optical amplifier for use in optical communication.

【0002】 [0002]

【従来の技術】図3に従来の光増幅器を使用した波長多重光源を示す。 BACKGROUND OF THE INVENTION Figure 3 shows a conventional wavelength multiplexing light source using an optical amplifier. 図3で、201,202,…,203は波長の異なる信号光源、204は各信号光源からの信号光を一本の光ファイバ205に合波する光合波器、206は合波された波長多重光を増幅する光増幅器、207は伝送路となる光ファイバである。 In Figure 3, 201, 202, ..., different signal source wavelengths 203, 204 an optical multiplexer for multiplexing the optical fiber 205 of the signal light one from each signal source, 206 a wavelength division multiplexed light multiplexed in amplified optical amplifier, 207 is an optical fiber serving as a transmission path. この図を使って、従来の波長多重光源の動作について説明する。 Using this figure, the operation of the conventional wavelength multiplexing light source.

【0003】図3のような従来の波長多重光源では、各信号光源201,202,…,203の出力光を電気信号によって変調し情報を伝送する。 In a conventional wavelength multiplexing light source as shown in FIG. 3, the signal light source 201, 202 ..., and transmits the modulated information by an electrical signal to output light 203. これらの変調信号光を光合波器20 Optical multiplexer these modulated optical signal 20
4により波長多重することによって、一本の光ファイバで大容量の情報を伝送することが可能になる。 By wavelength-multiplexed by 4, it is possible to transmit a large amount of information in a single optical fiber. さらに、 further,
この波長多重光を光増幅器206を使用して一括増幅することによって、伝送距離の長距離化や多分配化することが可能となる。 By collectively amplifies the wavelength multiplexed light by using the optical amplifier 206, it is possible to long-distance and multi distribution of transmission distance.

【0004】 [0004]

【発明が解決しようとする課題】しかし、このような波長多重光源では、各信号光源201,202,…,203の波長・光出力や光増幅器206の構造・状態によって、それぞれの波長における光増幅器206のゲインは異なることが知られている。 [SUMMARY OF THE INVENTION However, in such a wavelength-multiplexed light source, the signal source 201, ..., by the structure and condition of the wavelength-optical output or the optical amplifier 206 of 203, the optical amplifier 206 at the respective wavelengths gain is known to be different. 例えば、光増幅器の代表例であるEr等の希土類をドープした光ファイバアンプではゲインの波長依存性が大きく、その波長依存性も光ファイバアンプの構造・入力光の大きさによって複雑に異なるので、信号光源として使用できる波長の制約が大きく、いつでも出力レベルが揃った波長多重信号を光増幅器出力から得ることは困難であった。 For example, larger wavelength dependence of gain in the optical fiber amplifier and the earth of Er or the like as a typical example of an optical amplifier doped, because the wavelength dependency varies complicated by the structure and size of the input light of the optical fiber amplifier, greater constraints wavelengths that can be used as signal light sources, it has been difficult to obtain a wavelength-multiplexed signal with uniform output level at any time from the optical amplifier output.

【0005】また、1991信学秋全大C-207で程らが報告しているように、光増幅器206に波長多重信号を入力する場合、ある波長の信号光の入力の大きさによってその波長におけるゲインが変化するばかりでなく、他の波長の入力信号の大きさによってもその波長のゲインが影響を受ける。 [0005] 1991 Shingakuaki Zendai such extent et al report in the C-207, when entering the wavelength-multiplexed signal to the optical amplifier 206, the wavelength depending on the size of the input signal light of a certain wavelength not only the gain is changed in the gain of the wavelength by the magnitude of the input signals of the other wavelengths are affected. このため波長多重光を光増幅器に入力して、 Therefore enter the wavelength-multiplexed light to the optical amplifier,
各波長の光出力を希望した通りの大きさに得ることが難しかった。 It is difficult to obtain the magnitude of as wanted light output of each wavelength.

【0006】 [0006]

【課題を解決するための手段】本発明は、各信号光源波長の光増幅器光出力の大きさをそれぞれの信号光波長別または信号光を変調しているパイロット信号の周波数別にモニタするモニタ手段と、前記信号光源の出力電力を増減する制御手段を備えた波長多重光源である。 Means for Solving the Problems The present invention comprises a monitoring means for monitoring for each frequency of the pilot signal magnitude of the optical amplifier optical output is modulated to respective signal light wavelengths or by the signal light of each signal source wavelength a wavelength multiplexing light source with a control means for increasing or decreasing the output power of the signal light.

【0007】 [0007]

【作用】本発明では、モニタ手段によって各信号光源波長の光増幅器光出力の大きさをモニタし、その大きさに応じて制御手段により信号光源の出力を増減し、各信号光の光増幅器出力を希望の大きさに保つ。 According to the present invention monitors the magnitude of the optical amplifier optical output of each signal light wavelength by the monitor means, to increase or decrease the output of the signal source by the control means in accordance with the size of the optical amplifier output of each signal light keep to the desired size.

【0008】 [0008]

【実施例】図1は本発明の第1の実施例のブロック図を示している。 DETAILED DESCRIPTION FIG. 1 shows a block diagram of a first embodiment of the present invention. 図1において、101,102,…,103は出力光の波長がそれぞれλ 1 ,λ 2 ,…,λ nの信号光源、104はこれらの信号光源101,102,…,103からの信号光を一本の光ファイバ105に合波する光合波器、106は合波された波長多重光を増幅する光増幅器、107は光増幅器106で増幅された波長多重光を伝送する光ファイバ、108は光増幅器1 In Figure 1, 101, 102, ..., 103 respectively lambda 1 wavelength of the output light, lambda 2, ..., lambda n signal light source, 104 these signal light source 101, ..., one optical signal light from 103 optical multiplexer for multiplexing the fiber 105, an optical amplifier for amplifying are multiplexed wavelength-multiplexed light 106, an optical fiber for transmitting a wavelength-multiplexed light amplified by the optical amplifier 106 is 107, 108 optical amplifier 1
06の出力の一部を分岐する光分岐器、109,110,…,111は光分岐器108で分岐された波長多重光の中からそれぞれ波長λ 1 ,λ 2 ,…,λ nの光のみを抽出する狭帯域光バンドパスフィルタ、112,113,…,114はそれぞれ狭帯域光バンドパスフィルタ109,110,…,111の出力光の大きさをモニタする出力光モニタ手段、115,116,…,117は出力光モニタ手段112,113,…,114の出力に応じてそれぞれ信号光源101,102,…,103の信号光出力を増減する制御手段である。 Optical splitter for splitting part of the output of 06, extraction 109, ..., respectively wavelength lambda 1 from a wavelength-multiplexed light branched by the optical splitter 108 is 111, lambda 2, ..., only light of lambda n narrow-band optical band-pass filter, 112, 113, ..., 114 each narrow-band optical bandpass filters 109 and 110, ..., the output light monitor means for monitoring the magnitude of the output light 111, 115, 116, ..., 117 output light monitor means 112 and 113, ..., respectively signal sources 101 and 102 in accordance with the output of 114, ..., a control means for increasing or decreasing the signal light output of 103.

【0009】以上のように構成された第1の実施例の動作について以下に述べる。 [0009] The operation of the first embodiment constructed as described above will be described below. 各種の伝送する信号によって変調された信号光源101,102,…,103からの信号光は、光合波器104によって波長多重光となり、光増幅器106で一括増幅される。 Signal source 101 is modulated by a signal to be transmitted various, ..., signal light from the 103 becomes a multi-wavelength light by the optical multiplexer 104, it is collectively amplified by the optical amplifier 106. このとき各信号の光増幅器におけるゲインは、前述のようにその信号光の波長・大きさや光増幅器106の構造・状態などによって違うため、各信号光の光増幅器106出力の大きさが互いに異なってしまう。 Gain in the optical amplifier of each signal this time, since different depending on the structure, status of the wavelength-size and optical amplifier 106 of the signal light, as described above, the size of the optical amplifier 106 the output of each signal light is different from each other put away. そこで、光増幅器106の出力光から波長多重光を光分岐器1 Therefore, the optical splitter 1 wavelength-division-multiplexed optical from the output light of the optical amplifier 106
08で分岐し、分岐した波長多重光から狭帯域光バンドパスフィルタ109,110,…,111によって信号光源出力波長λ Branches at 08, branched WDM optical from narrow-band optical bandpass filters 109 and 110, ..., a signal light source output wavelength λ by 111
1 ,λ 2 ,…,λ nの光のみを抽出し、その大きさを出力光モニタ手段112,113,…,114においてモニタする。 1, lambda 2, ..., extracts only the light of lambda n, the magnitude of the output light monitor means 112, 113, ..., monitored at 114. 波長λ 1 ,λ 2 ,…,λ nの光増幅器106光出力それぞれの大きさによって増減する出力光モニタ手段112,113,…,114出力に応じて、制御手段115,116,…,117は対応する信号光源101,102,…,103の信号光出力を出力光モニタ手段112, Wavelength lambda 1, lambda 2, ..., output light monitor means to increase or decrease by the optical amplifier 106 of the respective light output magnitude of lambda n 112 and 113, ..., 114 in response to the output, the control means 115 and 116, ..., the corresponding signal light sources 117 101, ..., an output light monitor means 112 a signal light output of 103,
113,…,114出力が所要の光増幅器106光出力より小さいことを示している場合は大きく、逆の場合は小さくする。 113, ..., largely if 114 output indicates that less than the required optical amplifier 106 light output, in the opposite case reduced.

【0010】以上、本実施例によれば、信号光源の各波長の光増幅器出力が所要の大きさである波長多重光信号を得ることができる。 [0010] As described above, according to this embodiment, it is possible to the optical amplifier output of each wavelength of the signal light to obtain a wavelength-multiplexed optical signal having a required size. 光増幅器におけるゲインが入力信号光の大きさや光増幅器自身の構造・状態などによって変化しても、何等構成を変更することなしに各波長の光出力が希望する大きさの波長多重光を得ることが可能となる。 Be the gain of the optical amplifier is changed depending on the structure and status of the size and optical amplifier itself of the input signal light, the optical output of each wavelength without changing anything like configuration to obtain a wavelength-multiplexed light of the size desired it is possible. また、光合波器の特性やその経年変化などを考慮せずとも各波長の出力が一定の波長多重光が得ることができる。 Further, it is possible without considering the optical multiplexer of the characteristics and the aging output of each wavelength is obtained a certain wavelength-multiplexed light.

【0011】なお、本実施例では、光分岐器と狭帯域光バンドパスフィルタの組み合わせとしたが、狭帯域な分光特性を有する光分波器を使用しても同様の効果が得られる。 [0011] In this embodiment, although the combination of the optical splitter and the narrow-band optical band-pass filter, the same effect can be obtained by using the optical demultiplexer having a narrow-band spectral characteristics.

【0012】図2は本発明の第2の実施例のブロック図である。 [0012] FIG. 2 is a block diagram of a second embodiment of the present invention. 図2において、101,102,…,103は出力光の波長がそれぞれλ 1 ,λ 2 ,…λ nの信号光源、104はこれらの信号光源101,102,…,103からの信号光を一本の光ファイバ105に合波する光合波器、106は合波された波長多重光を増幅する光増幅器、107は光増幅器106で増幅された波長多重光を伝送する光ファイバ、108は光増幅器106の出力の一部を分岐する光分岐器でありここまでは、第1の実施例と同様の構成である。 2, 101, 102, ..., 103 1 lambda each wavelength of the output light, lambda 2, ... lambda n signal light source, 104 these signal light source 101, ..., of one signal light from 103 optical fiber optical multiplexer for multiplexing 105, an optical amplifier for amplifying the wavelength-multiplexed light that has been multiplexed in 106, 107 denotes an optical fiber for transmitting a wavelength-multiplexed light amplified by the optical amplifier 106, 108 is the output of the optical amplifier 106 an optical splitter for splitting a portion far is the same configuration as the first embodiment. 118,119,…,120はそれぞれ異なる周波数f 1 ,f 2 ,…,f nのパロット信号を発生するパイロット信号発生器、121,122,…,123はパイロット信号発生器118,119,…,120から出力された各パイロット信号をそれぞれの伝送電気信号に周波数多重する混合器、124は光分岐器108で分岐された光信号を電気信号変換する受光回路、125,126,…,127は受光回路124で変換された電気信号のうちそれぞれ周波数f 1 ,f 2 ,…,f 118,119, ..., 120 different frequencies f 1, respectively, f 2, ..., a pilot signal generator for generating a Parrot signal f n, 121 and 122, ..., 123 is a pilot signal generator 118, 119, ..., each output from the 120 mixer for frequency-multiplexing the pilot signal to each of the transmission electric signal, the light receiving circuit to an electric signal converting an optical signal branched by the optical splitter 108 is 124, 125 and 126, ..., the electrical signals converted by the light receiving circuit 124 127 each frequency f 1, f 2 of the, ..., f
nのみのパイロット信号のレベルの大きさをモニタするパイロット信号レベル・モニタ手段、以上の部分が第1 pilot signal level monitor means for monitoring the level of magnitude of n only the pilot signals, or portions first
の実施例と構成が異なる。 Examples and configuration are different. 115,116,…,117は第1の実施例と同様にパイロット信号レベル・モニタ手段125,126, 115 and 116, ..., 117 similarly to the first embodiment a pilot signal level monitoring means 125, 126,
…,127の出力に応じて信号光源101,102,…,103の信号光出力を増減する制御手段である。 ..., signal sources 101 and 102 in accordance with the output of 127, ..., a control means for increasing or decreasing the signal light output of 103.

【0013】以上のように構成された第2の実施例の動作について以下に述べる。 [0013] The operation of the second embodiment constructed as described above will be described below. 各伝送信号は、混合器121,12 Each transmission signal mixer 121,12
2,…,123でそれぞれパイロット信号発生器118,119,…,1 2, ..., 123 respectively pilot signal generator 118, 119, ..., 1
20から出力されるパイロット信号を周波数多重され、この多重信号によってそれぞれの信号光源101,102,…,103 A pilot signal output from the 20 is frequency-multiplexed, each of the signal sources 101, 102 by the multiplexed signal, ..., 103
は変調される。 It is modulated. このとき、信号光源101,102,…,103がパイロット信号によって所定の光変調度で変調されるようパイロット信号発生器118,119,…,120の出力レベルや信号光源101,102,…,103の駆動条件を定めておく。 At this time, the signal source 101, ..., 103 a pilot signal generator 118, 119 to be modulated at a predetermined optical modulation index by the pilot signals, ..., the output level and the signal light source 101, 102 120, ..., defining a driving condition of 103 deep. 周波数多重信号によって変調された信号光源101,102,…,103からの信号光は、光合波器104において波長多重光となり、光増幅器106で一括増幅される。 Signal source 101 is modulated by the frequency division multiplexed signal, ..., signal light from the 103 becomes a wavelength-multiplexed light in an optical multiplexer 104, it is collectively amplified by the optical amplifier 106. 光増幅器106出力光の1部を光分岐器108で分岐し、分岐した波長多重光を受光回路124において電気信号に変換する。 A part of the optical amplifier 106 output light branched by the optical splitter 108, converts the wavelength division multiplexed light branched into an electric signal in the light receiving circuit 124. 得られた電気信号は各伝送信号と各パイロット信号との周波数多重信号となる。 The obtained electric signals a frequency-multiplexed signal of each transmission signal and the pilot signal. この多重信号から、パイロット信号レベル・モニタ手段125,126,…,127によってそれぞれ周波数f This multiplex signal, the pilot signal level monitoring means 125, 126, ..., respectively, by 127 frequency f
1 ,f 2 ,…,f nのみのパイロット信号のレベルの大きさを検出しその結果を出力する。 1, f 2, ..., detects the level of the magnitude of the pilot signal f n only outputs the result. 光源側で光変調度があらかじめ決められているので、受光し電気に変換した後のパイロット信号レベルは対応する各波長の光増幅器10 Since the optical modulation index at the light source side is predetermined, for each wavelength pilot signal level after converting the received light electricity corresponding optical amplifier 10
6出力の大きさに比例している。 It is proportional to the magnitude of the 6 output. 周波数f 1 ,f 2 ,…, Frequency f 1, f 2, ...,
nの各パイロット信号の大きさによって増減するパイロット信号レベル・モニタ手段125,126,…,127出力に応じて、制御手段115,116,…,117は対応する信号光源101, pilot signal level monitoring means 125, 126 for increasing or decreasing the size of each pilot signal f n, ..., 127 in response to the output, the control means 115 and 116, ..., 117 corresponding signal source 101,
102,…,103の信号光出力をパイロット信号レベル・モニタ手段125,126,…,127出力が所要のパイロット信号レベルすなわち光増幅器106光出力より小さいことを示している場合は大きく、逆の場合は小さくする。 102, ..., the pilot signal signal light output of 103-level monitoring means 125, 126, ..., largely if 127 output indicates that less than the required pilot signal level or the optical amplifier 106 light output, in the opposite case small to.

【0014】以上、本実施例によれば、信号光源の各波長の光増幅器出力が所要の大きさである波長多重された光信号を得ることができる。 [0014] As described above, according to this embodiment, it is possible to the optical amplifier output of each wavelength of the signal light to obtain the required wavelength-multiplexed optical signal is the size. 光増幅器におけるゲインが入力信号光の大きさや光増幅器自身の構造・状態などが変化しても希望する光出力を何等変更することなしに得ることが可能となる。 Even such structure, the state of the size and optical amplifier itself gain the input signal light in the optical amplifier is changed it is possible to obtain without any way change the light output desired. また、1分岐の光分岐器で構成できるため送信光電力の損失を小さくすることができる。 Further, it is possible to reduce the loss of the transmission light power because it consists of a first branch of the optical branching device.
そして、光増幅器の後につける光部品が光分岐器1つであり、光電変換後電気で処理を行うので装置の構成が簡単でしかも規模を小さくすることが可能となる。 The optical component attached after the optical amplifier is one optical divider, the configuration of since the processing by the photoelectric conversion after electrical device it is possible to reduce the simple and scale. しかも、信号光源出力波長が変わっても、パイロット信号周波数と光変調度が変わらなければ他の部分を変更をしなくとも同様の効果を得ることができる。 Moreover, it changes the signal source output wavelength, even without changing other parts to be changed pilot signal frequency and the optical modulation index can be obtained a similar effect.

【0015】 [0015]

【発明の効果】本発明では、光増幅器におけるゲインが入力信号光の大きさや光増幅器自身の構造・状態などが変化しても光増幅器出力光を希望の大きさに保ち、安定した所望の波長多重光を得ることができる。 In the present invention, maintaining the optical amplifier output light be such structure, the state of the size and optical amplifier itself gain the input signal light is changed in the optical amplifier to the desired size, stable desired wavelength it can be obtained multiplexed light.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明の第1の実施例の波長多重光源のブロック図 Block diagram of a wavelength multiplexing light source of the first embodiment of the present invention; FIG

【図2】本発明の第2の実施例の波長多重光源のブロック図 Block diagram of a wavelength multiplexing light source of the second embodiment of the present invention; FIG

【図3】従来の波長多重光源のブロック図 3 is a block diagram of a conventional wavelength-multiplexed light source

【符号の説明】 DESCRIPTION OF SYMBOLS

101 信号光源1 102 信号光源2 103 信号光源n 104 光合波器 105 光ファイバ 106 光増幅器 107 光ファイバ 108 光分岐器 109 狭帯域光バンドパスフィルタ1 110 狭帯域光バンドパスフィルタ2 111 狭帯域光バンドパスフィルタn 112 出力光モニタ手段1 113 出力光モニタ手段2 114 出力光モニタ手段n 115 制御手段1 116 制御手段2 117 制御手段n 118 パイロット信号発生器1 119 パイロット信号発生器2 120 パイロット信号発生器n 121 混合器1 122 混合器2 123 混合器n 124 受光回路 125 パイロット信号レベル・モニタ手段1 126 パイロット信号レベル・モニタ手段2 127 パイロット信号レベル・モニタ手段n 201 信号光源1 202 信号光源2 203 信号光源n 204 光合波器 205 光ファイバ 206 光増幅器 207 光ファイバ 101 signal source 1 102 the signal light source 2 103 signal source n 104 optical multiplexer 105 optical fiber 106 optical amplifier 107 an optical fiber 108 an optical splitter 109 narrow-band optical bandpass filter 1 110 narrow band band-pass filter 2 111 narrow-band light band pass filter n 112 output optical monitor means 1 113 output optical monitor means 2 114 output optical monitor means n 115 control 1 116 control unit 2 117 controller n 118 pilot signal generator 1 119 pilot signal generator 2 120 pilot signal generator n 121 mixer 1 122 mixer 2 123 mixer n 124 receiving circuit 125 a pilot signal level monitoring means 1 126 pilot signal level monitor means 2 127 pilot signal level monitoring means n 201 signal source 1 202 the signal light source 2 203 signal source n 204 optical coupler 205 optical fiber 206 optical amplifier 207 an optical fiber

Claims (2)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】波長の異なる複数の信号光源と、前記信号光源の信号光を一本のファイバに合波する光合波器と、 A plurality of signal sources having different 1. A wavelength, and an optical multiplexer for multiplexing the one fiber signal light of the signal light source,
    前記光合波器で合波された波長多重光を増幅する光増幅器と、前記光増幅器光出力の大きさをそれぞれ前記信号光源の信号光波長に対応して波長別にモニタする出力光モニタ手段と、前記信号光源の信号光出力電力を増減する制御手段を備え、前記出力光モニタ手段によってモニタされた前記信号光源の信号光波長の前記光増幅器光出力の大小により対応する波長の前記信号光源の信号光出力を前記制御手段によって増減することを特徴とする波長多重光源。 An optical amplifier for amplifying the multiplexed wavelength multiplexed light in the optical multiplexer, and an output light monitor means for monitoring for each wavelength corresponds to the magnitude of the optical amplifier optical output signal light wavelengths of the signal light source, a control means for increasing or decreasing the signal light output power of the signal light, the signal of the corresponding signal light sources of wavelengths depending on the size of the optical amplifier optical output signal light wavelength of the signal light source is monitored by the output light monitoring means wavelength multiplexing light source, characterized in that to increase or decrease the light output by said control means.
  2. 【請求項2】波長の異なる複数の信号光源と、前記信号光源の信号光を各々異なった周波数の電気信号(以下パイロット信号)によってあらかじめ決められた光変調度で変調する変調手段と、前記信号光源の信号光を一本のファイバに合波する光合波器と、前記光合波器で合波された波長多重光を増幅する光増幅器と、前記光増幅器光出力の一部を分岐する光分岐器と、前記光分岐器で分岐された波長多重光を電気信号に変換する受光回路と、前記受光回路周波数多重信号出力の中から各パイロット信号のみ大きさをモニタするモニタ手段と、前記信号光源の信号光出力電力を増減する制御手段を備え、前記モニタ手段によってモニタされた前記パイロット信号の大小に応じて前記制御手段によりパイロット信号周波数に対応する前記信号光 A plurality of signal sources having different 2. A wavelength, modulation means for modulating with a predetermined optical modulation index by an electrical signal of each different frequency signal light of the signal light source (hereinafter the pilot signal), the signal an optical multiplexer for multiplexing the signal light of the light source to a single fiber, an optical amplifier for amplifying the multiplexed wavelength multiplexed light in the optical multiplexer, an optical branching which branches a part of the optical amplifier optical output a vessel, a light receiving circuit for converting an electrical signal to wavelength-division-multiplexed optical signals divided by the optical splitter, and a monitor means for monitoring the pilot signal magnitude only from the light receiving circuit frequency-multiplexed signal output, the signal source the signal light of a control means for increasing or decreasing the signal light output power, corresponding to the pilot signal frequency by said control means in accordance with the magnitude of the pilot signal monitored by the monitoring means の信号光出力を増減することを特徴とする波長多重光源。 Wavelength multiplexing light source, characterized by increasing or decreasing the signal light output.
JP13214892A 1992-05-25 1992-05-25 Wavelength multiplex light source Pending JPH05327662A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13214892A JPH05327662A (en) 1992-05-25 1992-05-25 Wavelength multiplex light source

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13214892A JPH05327662A (en) 1992-05-25 1992-05-25 Wavelength multiplex light source

Publications (1)

Publication Number Publication Date
JPH05327662A true true JPH05327662A (en) 1993-12-10

Family

ID=15074483

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13214892A Pending JPH05327662A (en) 1992-05-25 1992-05-25 Wavelength multiplex light source

Country Status (1)

Country Link
JP (1) JPH05327662A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0734129A3 (en) * 1995-03-20 1997-05-07 Fujitsu Ltd Multi-wavelength optical batch amplification apparatus
US6078413A (en) * 1996-11-29 2000-06-20 Nec Corporation Optical branching/multiplexing apparatus
US6134034A (en) * 1996-03-18 2000-10-17 Fujitsu Limited Apparatus and method for controlling power levels of individual signal lights of a wavelength division multiplexed signal light
US6204945B1 (en) 1996-07-09 2001-03-20 Fujitsu Limited Signal light outputting apparatus and optical transmission system having signal light outputting apparatus
US6211981B1 (en) 1996-11-29 2001-04-03 Nec Corporation Optical wavelength multiplex transmission system using repeaters
US6233076B1 (en) 1996-09-17 2001-05-15 Fujitsu Limited Optical communications system
WO2002011337A1 (en) * 2000-07-31 2002-02-07 Mitsubishi Denki Kabushiki Kaisha Optical wavelength division multiplexing device
US6574017B1 (en) 1998-01-05 2003-06-03 Nec Corporation Wavelength division multiplex transmitter
JP2011217165A (en) * 2010-03-31 2011-10-27 Opnext Japan Inc Optical transmitter, optical transmission component and method for controlling optical transmitter
JP2013110688A (en) * 2011-11-24 2013-06-06 Mitsubishi Electric Corp Optical transmitter

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5870217A (en) * 1995-03-20 1999-02-09 Fujitsu Limited Multi-wavelength optical batch amplification apparatus
EP0734129A3 (en) * 1995-03-20 1997-05-07 Fujitsu Ltd Multi-wavelength optical batch amplification apparatus
US6134034A (en) * 1996-03-18 2000-10-17 Fujitsu Limited Apparatus and method for controlling power levels of individual signal lights of a wavelength division multiplexed signal light
US6271945B1 (en) 1996-03-18 2001-08-07 Fujitsu Limited Apparatus and method for controlling power levels of individual signal lights of a wavelength division multiplexed signal light
US6204945B1 (en) 1996-07-09 2001-03-20 Fujitsu Limited Signal light outputting apparatus and optical transmission system having signal light outputting apparatus
US6721507B2 (en) 1996-09-17 2004-04-13 Fujitsu Limited Optical communications system
US6233076B1 (en) 1996-09-17 2001-05-15 Fujitsu Limited Optical communications system
US6414770B2 (en) 1996-09-17 2002-07-02 Fujitsu Limited Optical communications system
US6078413A (en) * 1996-11-29 2000-06-20 Nec Corporation Optical branching/multiplexing apparatus
US6211981B1 (en) 1996-11-29 2001-04-03 Nec Corporation Optical wavelength multiplex transmission system using repeaters
US6574017B1 (en) 1998-01-05 2003-06-03 Nec Corporation Wavelength division multiplex transmitter
WO2002011337A1 (en) * 2000-07-31 2002-02-07 Mitsubishi Denki Kabushiki Kaisha Optical wavelength division multiplexing device
US7236703B1 (en) 2000-07-31 2007-06-26 Mitsubishi Denki Kabushiki Kaisha Optical wavelength division multiplexing device
JP2011217165A (en) * 2010-03-31 2011-10-27 Opnext Japan Inc Optical transmitter, optical transmission component and method for controlling optical transmitter
JP2013110688A (en) * 2011-11-24 2013-06-06 Mitsubishi Electric Corp Optical transmitter

Similar Documents

Publication Publication Date Title
US6233261B1 (en) Optical communications system
US5870213A (en) Optical transmission system, optical multiplexing transmission system, and related peripheral techniques
US5915052A (en) Loop status monitor for determining the amplitude of the signal components of a multi-wavelength optical beam
US5754321A (en) Add/drop optical circuit for a wavelength-division multiplexed network
Zyskind et al. Fast-link control protection of surviving channels in multiwavelength optical networks
US7327957B2 (en) Wavelength-tunable light source and wavelength-division multiplexed transmission system using the source
US5764404A (en) Wavelength-division-multiplexing optical amplifier
US6091538A (en) Gain equalizing apparatus
US6288810B1 (en) Device for adding and dropping optical signals
US6134036A (en) Add/drop multiplexer node
US6633430B1 (en) Booster amplifier with spectral control for optical communications systems
US5276543A (en) Optical signal equalizer for wavelength division multiplexed optical fiber systems
US5173794A (en) Wavelength division multiplexing using a tunable acousto-optic filter
US4807227A (en) Optical wavelength-division switching system with coherent optical detection system
US6538782B1 (en) Light branching/inserting apparatus and light branching apparatus using wavelength selection filter
US6735395B1 (en) WDM communication system utilizing WDM optical sources with stabilized wavelengths and light intensity and method for stabilization thereof
US6433864B1 (en) Apparatus for monitoring optical signal-to-noise ratio of optical signals in WDM optical transmission system
US6212001B1 (en) Method and system for controlling optical amplification in wavelength division multiplex optical transmission
US7106974B2 (en) Low-cost WDM source with an incoherent light injected fabry-perot laser diode
US4945531A (en) Optical wavelength-division multiplex transmission system with an optical filter for spontaneous emission noise
US6559984B1 (en) Apparatus for monitoring optical path based on the identification of optical cross-connect input ports
US6396574B1 (en) Apparatus for measuring the wavelength, optical power and optical signal-to-noise ratio of each optical signal in wavelength-division multiplexing optical communication
US5696857A (en) WDM/FDM fiber optic sensor architecture using WDM tap coupler
US20040114923A1 (en) OSNR monitoring method and apparatus using tunable optical bandpass filter and polarization nulling method
US20080124076A1 (en) OSNR Monitoring Apparatus And Method Using Polarization Splitting