JPH04128719A - Gain control type optical fiber amplifier - Google Patents
Gain control type optical fiber amplifierInfo
- Publication number
- JPH04128719A JPH04128719A JP2251243A JP25124390A JPH04128719A JP H04128719 A JPH04128719 A JP H04128719A JP 2251243 A JP2251243 A JP 2251243A JP 25124390 A JP25124390 A JP 25124390A JP H04128719 A JPH04128719 A JP H04128719A
- Authority
- JP
- Japan
- Prior art keywords
- intensity
- optical fiber
- gain
- signal light
- light
- 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
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 50
- 230000003321 amplification Effects 0.000 claims abstract description 18
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 18
- 238000005086 pumping Methods 0.000 claims description 31
- 238000012544 monitoring process Methods 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims 1
- 230000003287 optical effect Effects 0.000 abstract description 15
- 230000005284 excitation Effects 0.000 description 29
- 230000010287 polarization Effects 0.000 description 17
- 230000008859 change Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 229910052691 Erbium Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094003—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
Abstract
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野）
この発明は、例えば光通信システムに用いられる利得制
御式光ファイバ増幅器に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a gain-controlled optical fiber amplifier used, for example, in an optical communication system.
（従来の技術）
一般に、光ファイバ増幅器は、コア部分にエルビウムを
ドープした増幅用光ファイバが用いられ、最近の研究に
より高利得、低雑音、伝送用光ファイバとの整合性に優
れていることが明らかにされている。そこで、このよう
な光ファイバ増幅器にあっては、光通信システムにおけ
るポストアンプ、プリアンプ、中間増幅器として用いる
ことにより、伝送線路損失を補償して長距離伝送を実現
するものとして有望視されている。(Prior art) Optical fiber amplifiers generally use amplification optical fibers whose core portion is doped with erbium, and recent research has shown that they have high gain, low noise, and excellent compatibility with transmission optical fibers. has been revealed. Therefore, such optical fiber amplifiers are seen as promising for use as post-amplifiers, pre-amplifiers, and intermediate amplifiers in optical communication systems to compensate for transmission line losses and realize long-distance transmission.
ところで、このような光ファイバ増幅器としては、入力
信号光強度に応じて信号利得が可変制御される利得制御
式があり、この方式は伝送システムの広ダイナミツクレ
ンジ化に有効であるとされている。By the way, among such optical fiber amplifiers, there is a gain control type in which the signal gain is variably controlled according to the input signal light intensity, and this method is said to be effective in widening the dynamic range of transmission systems. .
第４図はこのような従来の利得制御式光ファイバ増幅器
を示すもので、その入力ボート１は合波器２の一方の入
力端に接続される。この合波器２の他方の入力端には励
起光源３の出力端が接続されており、入力信号光と励起
光を合波して増幅用光ファイバ４に出力する。光ファイ
バ４は入力した信号光を増幅した後、バンドパスフィル
タ５に出力する。バンドパスフィルタ５は励起光を遮断
するための信号光波長に対応して形成されており、信号
光成分を抽出して光分岐器６に出力する。光分岐器６は
、その一方の出力端が出力ポードアに接続され、その他
方の出力端には出力信号光モニタ回路８が接続される。FIG. 4 shows such a conventional gain-controlled optical fiber amplifier, the input port 1 of which is connected to one input end of the multiplexer 2. The output end of the pumping light source 3 is connected to the other input end of the multiplexer 2, and the input signal light and the pumping light are combined and output to the amplification optical fiber 4. The optical fiber 4 amplifies the input signal light and then outputs it to the bandpass filter 5. The bandpass filter 5 is formed to correspond to the wavelength of the signal light for blocking the excitation light, and extracts the signal light component and outputs it to the optical splitter 6. The optical splitter 6 has one output end connected to the output port door, and the other output end connected to the output signal light monitor circuit 8.
出力信号光モニタ回路８は出力信号光成分の一部が入力
され、出力信号光強度を求めて制御回路９に出力する。A part of the output signal light component is input to the output signal light monitor circuit 8 , which determines the output signal light intensity and outputs it to the control circuit 9 .
制御回路９は入力した出力信号光強度に応じて励起光源
を制御して、励起光の強度を可変制御し、光増幅の利得
を制御する。The control circuit 9 controls the pump light source according to the input output signal light intensity, variably controls the pump light intensity, and controls the gain of optical amplification.
上記構成により、入力される信号光強度か変化すると、
出力信号光モニタ回路８は入力される信号光成分の一部
より出力信号光強度の変化を検出して制御回路９に出力
する。すると、制御回路９は、その出力信号光強度の変
化に対応して励起光源３を制御して光増幅の利得を変化
させ、その出力信号光強度を所定の値に保つ。With the above configuration, when the input signal light intensity changes,
The output signal light monitor circuit 8 detects a change in the output signal light intensity from a part of the input signal light component and outputs it to the control circuit 9. Then, the control circuit 9 controls the pumping light source 3 in response to the change in the output signal light intensity to change the optical amplification gain and maintain the output signal light intensity at a predetermined value.
しかしながら、上記利得制御式光ファイバ増幅器では、
出力信号光の一部を光分岐器６を介して取出してモニタ
することにより、出力信号光強度を求めている構成上、
光分岐器６の透過損失の分だけ、光増幅器としての利得
が減少するという問題を有していた。また、入力信号光
の偏光状態が変化すると、増幅用光ファイバの出力信号
光の偏光状態も変化してしまうので、光分岐器６の偏波
依存性により、分岐比が変化してしまうために、所望の
精度で出力信号光強度を制御することが困難となるとい
う問題を有する。However, in the above gain-controlled optical fiber amplifier,
Due to the structure, the output signal light intensity is determined by extracting a part of the output signal light through the optical splitter 6 and monitoring it.
There was a problem in that the gain as an optical amplifier was reduced by the transmission loss of the optical splitter 6. Furthermore, when the polarization state of the input signal light changes, the polarization state of the output signal light of the amplification optical fiber also changes, so the branching ratio changes due to the polarization dependence of the optical splitter 6. However, there is a problem in that it is difficult to control the output signal light intensity with desired accuracy.
（発明が解決しようとする課題）
以上述べたように、従来の利得制御式光ファイバ増幅器
では、利得が減少されると共に、入力信号光の偏光状態
が変化すると、出力信号光強度の高精度な制御が困難と
なるという問題を有していた。(Problem to be Solved by the Invention) As described above, in the conventional gain-controlled optical fiber amplifier, when the gain is reduced and the polarization state of the input signal light changes, the output signal light intensity cannot be adjusted with high accuracy. The problem was that it was difficult to control.
この発明は上記の事情に鑑みてなされたもので、構成簡
易にして、信号利得の高利得化を実現し得、且つ入力信
号光の偏波の変化に依存することなく、出力信号光強度
の高精度な制御を実現し得るようにした利得制御式光フ
ァイバ増幅器を提供することを目的とする。This invention was made in view of the above circumstances, and it is possible to achieve a high signal gain with a simple configuration, and to increase the output signal light intensity without depending on changes in the polarization of the input signal light. It is an object of the present invention to provide a gain control type optical fiber amplifier that can realize highly accurate control.
［発明の構成］
（課題を解決するための手段及び作用）この発明は励起
光強度を変化させて入力信号光の利得を制御する利得制
御式光ファイバ増幅器において、励起光源からの励起光
と入力信号光とが合波されて入力される増幅用光ファイ
バと、この光ファイバの出力信号光を信号光成分及び励
起光成分に分離する分波手段と、この分波手段で分離し
た前記励起光成分をモニタして、強度を求めるモニタ手
段と、このモニタ手段で検出した励起光成分の強度に応
じて前記励起光源の励起光強度を制御する制御手段とを
備えて構成した。[Structure of the Invention] (Means and Effects for Solving the Problems) The present invention provides a gain-controlled optical fiber amplifier that controls the gain of input signal light by changing the intensity of pumping light. an amplification optical fiber into which the signal light is multiplexed and input; a demultiplexing means for separating the output signal light of the optical fiber into a signal light component and a pumping light component; and the pumping light separated by the demultiplexing means. The device is configured to include a monitor means for monitoring the component to determine the intensity, and a control means for controlling the excitation light intensity of the excitation light source according to the intensity of the excitation light component detected by the monitor means.
上記構成によれば、モニタ手段は光ファイバの出力信号
光のうち分波手段で分波された励起光成分に基づいて入
力信号光強度を求めていることにより、出力信号光の信
号光成分に影響を与えることがなく、入力信号光強度に
応じた信号利得の制御が実現される。従って、従来のよ
うに光ファイバの出力信号光の一部を取出して励起光強
度を求めている場合に比して、その信号利得の高利得化
が図れる。According to the above configuration, the monitor means determines the input signal light intensity based on the pump light component demultiplexed by the demultiplexing means out of the output signal light of the optical fiber, thereby determining the signal light component of the output signal light. It is possible to control the signal gain according to the input signal light intensity without any influence. Therefore, compared to the conventional case where a part of the output signal light of the optical fiber is extracted to determine the pumping light intensity, the signal gain can be increased.
また、これによれば、入力信号光の偏光に依存していな
いことにより、偏光状態の変化に対して利得制御系に影
響を与えることがない。従って、入力信号光の偏光状態
と無関係に所定の信号利得を得ることが可能となる。Moreover, according to this, since it does not depend on the polarization of the input signal light, changes in the polarization state do not affect the gain control system. Therefore, it is possible to obtain a predetermined signal gain regardless of the polarization state of the input signal light.
また、この発明は励起光強度を変化させて入力信号光の
利得を制御する利得制御式光ファイバ増幅器において、
励起光源からの励起光と入力信号光とが合波されて入力
される増幅用光ファイバと、この増幅用光ファイバの出
力信号光を信号光成分及び励起光成分に分離する分波手
段と、この分波手段で分離した前記励起光成分の強度を
求める第１のモニタ手段と、前記励起光源の出力強度を
求める第２のモニタ手段と、前記第１及び第２のモニタ
手段の出力に基づいて前記励起光強度を制御する制御手
段とを備えて構成した。The present invention also provides a gain control type optical fiber amplifier that controls the gain of input signal light by changing the pumping light intensity.
an amplification optical fiber into which the pump light from the pump light source and the input signal light are combined and input; a demultiplexing means for separating the output signal light of the amplification optical fiber into a signal light component and a pump light component; a first monitor means for determining the intensity of the excitation light component separated by the demultiplexing means; a second monitor means for determining the output intensity of the excitation light source; and a control means for controlling the intensity of the excitation light.
上記構成によれば、第１のモニタ手段は光ファイバの出
力信号光のうち分波手段で分波された励起光成分に基づ
いて入力信号光強度を求めていることにより、出力信号
光の信号光成分に影響を与えることがなく、入力信号光
強度に応じた信号利得の制御が実現される。従って、同
様に従来のような光ファイバの出力信号光の一部を取出
して励起光強度を求めている場合に比して、その信号利
得の高利得化が図れると共に、入力信号光の偏光状態と
無関係に所定の信号利得を得ることが可能となる。According to the above configuration, the first monitor means determines the input signal light intensity based on the pumping light component demultiplexed by the demultiplexing means out of the output signal light of the optical fiber, thereby determining the signal of the output signal light. Control of the signal gain according to the input signal light intensity is realized without affecting the optical component. Therefore, compared to the conventional case where a part of the output signal light of an optical fiber is extracted to determine the pumping light intensity, the signal gain can be increased, and the polarization state of the input signal light can be increased. It becomes possible to obtain a predetermined signal gain regardless of the
（実施例）
以下、この発明の実施例について、図面を参照して詳細
に説明する。(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.
第１図はこの発明の一実施例に係る利得制御式光ファイ
バ増幅器を示すもので、その入力ポート１０には合波器
１１の一方の入力端が接続される。FIG. 1 shows a gain-controlled optical fiber amplifier according to an embodiment of the present invention, and one input end of a multiplexer 11 is connected to an input port 10 of the amplifier.
この合波器１１の他方の入力端には励起光源１２の出力
端が接続されており、入力した入力信号光及び励起光を
合波して増幅用光ファイバ１３に出力する。光ファイバ
１３は入力信号光を増幅した後、分波器１４に出力する
。分波器１４は入力した光ファイバ１３の出力光を信号
光成分及び励起光成分に分波して、その信号光成分を出
力ボート１５に出力する。同時に、分波器１４は励起光
成分をモニタ回路１６に出力する。モニタ回路１６は入
力した励起光成分を光／電気変換して励起光成分強度を
求めて制御回路１７に出力する。制御回路１７は入力し
た励起光成分強度に応じて励起光源を制御して励起光強
度を可変制御し、光増幅の利得を制御する。The output end of a pump light source 12 is connected to the other input end of the multiplexer 11, and the input signal light and pump light are combined and output to an amplification optical fiber 13. The optical fiber 13 amplifies the input signal light and then outputs it to the demultiplexer 14 . The demultiplexer 14 demultiplexes the input output light from the optical fiber 13 into a signal light component and a pumping light component, and outputs the signal light component to the output port 15 . At the same time, the duplexer 14 outputs the excitation light component to the monitor circuit 16. The monitor circuit 16 optically/electrically converts the input excitation light component to obtain the excitation light component intensity and outputs it to the control circuit 17 . The control circuit 17 controls the pump light source in accordance with the input pump light component intensity to variably control the pump light intensity and control the gain of optical amplification.
上記構成により、入力ボード１０に入力された入力信号
光強度が変化すると、モニタ回路１６は分波器１４を介
して入力される励起光成分に基づいて励起光強度を検出
して制御回路１７に出力する。すると、制御回路１７は
、その励起光成分強度の変化に対応し−て励起光源１２
を制御して光増幅の利得を変化させ、分波器１４を介し
て出力ボート１５に出力される出力信号光の強度を所定
の値に制御する。With the above configuration, when the input signal light intensity input to the input board 10 changes, the monitor circuit 16 detects the pump light intensity based on the pump light component input via the demultiplexer 14 and sends it to the control circuit 17. Output. Then, the control circuit 17 controls the excitation light source 12 in response to the change in the excitation light component intensity.
is controlled to change the gain of the optical amplification, and the intensity of the output signal light outputted to the output port 15 via the demultiplexer 14 is controlled to a predetermined value.
このように、上記利得制御式光ファイバ増幅器は増幅用
光ファイバ１３の出力信号光のうちモニタ回路１６で分
波器１４によって分波された励起光成分強度を求め、こ
の励起光成分強度に基づいて信号利得を制御するように
構成した。励起光源より出力される励起光強度が一定の
条件下では、光ファイバ１３より出力される励起光成分
強度は第２図に示すように、入力信号光強度が増加する
と、減少する特性を有する。これにより、マーク率一定
の信号光が入力している状態においては、入力信号光の
強度は光ファイバの出力信号光の励起光成分をモニタす
ることによって間接的にモニタすることができる。よっ
て、モニタ回路１６で求めた励起光成分強度に基づいて
励起光源の励起光強度を制御して、信号利得を変化させ
て出力信号光の強度を所定の値に制御することが可能と
なる。In this manner, the gain control type optical fiber amplifier determines the intensity of the pumping light component split by the demultiplexer 14 in the monitor circuit 16 out of the output signal light of the amplifying optical fiber 13, and calculates the intensity of the pumping light component based on this pumping light component intensity. It was configured to control the signal gain by Under conditions where the intensity of the excitation light output from the excitation light source is constant, the intensity of the excitation light component output from the optical fiber 13 has a characteristic of decreasing as the input signal light intensity increases, as shown in FIG. Thereby, in a state where signal light with a constant mark rate is input, the intensity of the input signal light can be indirectly monitored by monitoring the excitation light component of the output signal light of the optical fiber. Therefore, it is possible to control the intensity of the pump light from the pump light source based on the intensity of the pump light component determined by the monitor circuit 16, change the signal gain, and control the intensity of the output signal light to a predetermined value.
これによれば、出力信号光の信号光成分に影響を与える
ことがなく、信号利得の制御が実現されることにより、
従来のように光ファイバ４の出力信号光の一部を取出し
て励起光強度を求めている場合に比して、その信号利得
の高利得化が図れる。According to this, the signal gain can be controlled without affecting the signal light component of the output signal light.
Compared to the conventional case where a part of the output signal light of the optical fiber 4 is extracted to obtain the pumping light intensity, the signal gain can be increased.
また、これによれば、励起光成分の偏光状態は、入力信
号光の偏波に対して依存していないので、入力信号の偏
光状態が変化しても、信号利得制御系に影響を与えるこ
とがない。従って、例えば増幅用光ファイバ１３として
偏波保持型等を使用することにより励起光の偏光状態を
保存しておけば、入力信号光の偏光状態の変化に影響を
受けることなく、所定の精度で信号利得を制御すること
が可能となる。Furthermore, according to this, the polarization state of the pump light component does not depend on the polarization of the input signal light, so even if the polarization state of the input signal changes, it will not affect the signal gain control system. There is no. Therefore, if the polarization state of the pump light is preserved, for example by using a polarization maintaining type as the amplification optical fiber 13, the polarization state of the pump light can be maintained without being affected by changes in the polarization state of the input signal light. It becomes possible to control the signal gain.
さらに、これによれば、出力信号光より信号光成分及び
励起光成分を分離する構成であることにより、従来のよ
うに光ファイバ４からの出力信号光より信号光成分を取
出して、この信号光成分の一部より励起光強度を求める
場合に比して、その構成部品の削減化も図れる。Further, according to this, since the signal light component and the excitation light component are separated from the output signal light, the signal light component can be extracted from the output signal light from the optical fiber 4 as in the conventional case, and the signal light component can be extracted from the output signal light from the optical fiber 4. Compared to the case where the excitation light intensity is determined from a part of the components, the number of components can be reduced.
なお、上記実施例では、いわゆる中間増幅器として用い
た場合を代表して説明したが、これに限ることなく、光
受信器のプリアンプとして用いることも可能である。In the above embodiments, the case where the present invention is used as a so-called intermediate amplifier has been described as a representative example, but the present invention is not limited to this, and it is also possible to use it as a preamplifier of an optical receiver.
また、この発明は第３図に示すように励起光源１２に出
力強度を求める励起光強度モニタ回路１８を設け、この
励起光強度モニタ回路１８の出力と上記モニタ回路１６
の出力とに基づいて制御回路１７で励起光強度を求め、
この励起光強度に基づいて励起光源１２の出力強度を制
御するように構成することも可能である。これによれば
、上記実施例と略同様の効果が得られる他に、励起光源
１２の出力強度をモニタしていることにより、励起光源
１２の出力強度に応じた制御も可能となるため、より多
様な機能が実現されるという効用も有する。Further, as shown in FIG. 3, the present invention is provided with an excitation light intensity monitor circuit 18 for determining the output intensity of the excitation light source 12, and the output of this excitation light intensity monitor circuit 18 and the monitor circuit 16 are
The excitation light intensity is determined by the control circuit 17 based on the output of
It is also possible to configure the output intensity of the excitation light source 12 to be controlled based on this excitation light intensity. According to this, in addition to obtaining substantially the same effect as the above embodiment, since the output intensity of the excitation light source 12 is monitored, control according to the output intensity of the excitation light source 12 is also possible. It also has the benefit of realizing a variety of functions.
なお、上記励起光源強度モニタ回路１８は、例えば励起
光源１２と同一の容器にフォトダイオードを収容配置し
て構成される。Note that the excitation light source intensity monitoring circuit 18 is configured by accommodating and arranging a photodiode in the same container as the excitation light source 12, for example.
よって、この発明は上記実施例に限ることなく、その他
、この発明の要旨を逸脱しない範囲で種々の変形を実施
し得ることは勿論のことである。Therefore, it goes without saying that the present invention is not limited to the above embodiments, and that various modifications can be made without departing from the spirit of the invention.
［発明の効果］
以上詳述したように、この発明によれば、構成簡易にし
て、信号利得の高利得化を実現し得、且つ入力信号光の
偏波の変化に依存することなく、出力信号光強度の高精
度な制御を実現し得るようにした利得制御式光ファイバ
増幅器を提供することができる。[Effects of the Invention] As described in detail above, according to the present invention, it is possible to achieve a high signal gain with a simple configuration, and to increase the output without depending on changes in the polarization of input signal light. It is possible to provide a gain-controlled optical fiber amplifier that can realize highly accurate control of signal light intensity.
第１図はこの発明の一実施例に係る利得制御式光ファイ
バ増幅器を示したブロック図、第２図は第１図の動作を
説明するために示した特性図、第３図はこの発明の他の
実施例を示すブロック図、第４図は従来の利得制御式光
ファイバ増幅器を示したブロック図である。
１０・・・入力ポート、１１・・・合波器、１２・・・
励起光源、１３・・・増幅用光ファイバ、１４・・・分
波器、１５・・・出力ボート、１６・・・モニタ回路、
１７・・・制御回路、励起光強度モニタ回路。
出願人代理人 弁理士 鈴江武彦FIG. 1 is a block diagram showing a gain-controlled optical fiber amplifier according to an embodiment of the present invention, FIG. 2 is a characteristic diagram shown to explain the operation of FIG. 1, and FIG. A block diagram showing another embodiment. FIG. 4 is a block diagram showing a conventional gain control type optical fiber amplifier. 10... Input port, 11... Multiplexer, 12...
Pumping light source, 13... Optical fiber for amplification, 14... Demultiplexer, 15... Output boat, 16... Monitor circuit,
17...Control circuit, excitation light intensity monitor circuit. Applicant's agent Patent attorney Takehiko Suzue
Claims (2)
する利得制御式光ファイバ増幅器において、 励起光源からの励起光と入力信号光とが合波されて入力
される増幅用光ファイバと、 この増幅用光ファイバの出力信号光を信号光成分及び励
起光成分に分離する分波手段と、 この分波手段で分離した前記励起光成分の強度を求める
モニタ手段と、 このモニタ手段で検出した励起光成分の強度に応じて前
記励起光源の励起光強度を制御する制御手段とを具備し
たことを特徴とする利得制御式光ファイバ増幅器。(1) In a gain-controlled optical fiber amplifier that controls the gain of input signal light by changing the pumping light intensity, an amplification optical fiber is used, into which the pumping light from the pumping light source and the input signal light are combined and input. , a demultiplexing means for separating the output signal light of the amplification optical fiber into a signal light component and a pumping light component; a monitoring means for determining the intensity of the pumping light component separated by the demultiplexing means; and detection by the monitoring means. 1. A gain control type optical fiber amplifier comprising: control means for controlling the intensity of the pumping light of the pumping light source according to the intensity of the pumping light component.
する利得制御式光ファイバ増幅器において、 励起光源からの励起光と入力信号光とが合波されて入力
される増幅用光ファイバと、 この増幅用光ファイバの出力信号光を信号光成分及び励
起光成分に分離する分波手段と、 この分波手段で分離した前記励起光成分の強度を求める
第１のモニタ手段と、 前記励起光源の出力強度を求める第２のモニタ手段と、 前記第１及び第２のモニタ手段の出力に基づいて前記励
起光強度を制御する制御手段とを具備したことを特徴と
する利得制御式光ファイバ増幅器。(2) In a gain control type optical fiber amplifier that controls the gain of input signal light by changing the pumping light intensity, an amplification optical fiber is used, into which the pumping light from the pumping light source and the input signal light are combined and input. , a demultiplexing means for separating the output signal light of the amplification optical fiber into a signal light component and a pumping light component; a first monitoring means for determining the intensity of the pumping light component separated by the demultiplexing means; and the pumping light component. A gain-controlled optical fiber comprising: second monitor means for determining the output intensity of the light source; and control means for controlling the pumping light intensity based on the outputs of the first and second monitor means. amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2251243A JPH04128719A (en) | 1990-09-19 | 1990-09-19 | Gain control type optical fiber amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2251243A JPH04128719A (en) | 1990-09-19 | 1990-09-19 | Gain control type optical fiber amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04128719A true JPH04128719A (en) | 1992-04-30 |
Family
ID=17219863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2251243A Pending JPH04128719A (en) | 1990-09-19 | 1990-09-19 | Gain control type optical fiber amplifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04128719A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05206555A (en) * | 1992-01-28 | 1993-08-13 | Nippon Telegr & Teleph Corp <Ntt> | Light amplifier |
| JP2011181761A (en) * | 2010-03-02 | 2011-09-15 | Omron Corp | Laser processing apparatus |
| WO2019198663A1 (en) * | 2018-04-11 | 2019-10-17 | 日本電気株式会社 | Optical amplifier and optical amplification method |
-
1990
- 1990-09-19 JP JP2251243A patent/JPH04128719A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05206555A (en) * | 1992-01-28 | 1993-08-13 | Nippon Telegr & Teleph Corp <Ntt> | Light amplifier |
| JP2011181761A (en) * | 2010-03-02 | 2011-09-15 | Omron Corp | Laser processing apparatus |
| WO2019198663A1 (en) * | 2018-04-11 | 2019-10-17 | 日本電気株式会社 | Optical amplifier and optical amplification method |
| JPWO2019198663A1 (en) * | 2018-04-11 | 2021-04-08 | 日本電気株式会社 | Optical amplifier and optical amplifier method |
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