JPH035731A - Light amplifying method - Google Patents
Light amplifying methodInfo
- Publication number
- JPH035731A JPH035731A JP13974989A JP13974989A JPH035731A JP H035731 A JPH035731 A JP H035731A JP 13974989 A JP13974989 A JP 13974989A JP 13974989 A JP13974989 A JP 13974989A JP H035731 A JPH035731 A JP H035731A
- Authority
- JP
- Japan
- Prior art keywords
- light
- optical fiber
- fiber amplifier
- optical
- output
- 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
- 238000000034 method Methods 0.000 title claims description 14
- 239000013307 optical fiber Substances 0.000 claims abstract description 36
- 230000003287 optical effect Effects 0.000 claims abstract description 27
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 4
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 4
- 238000005086 pumping Methods 0.000 claims description 18
- 230000003321 amplification Effects 0.000 claims description 13
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 13
- 230000005284 excitation Effects 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 230000007423 decrease Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 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
-
- 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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/131—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S3/1312—Stabilisation of laser output parameters, e.g. frequency or amplitude by controlling the active medium, e.g. by controlling the processes or apparatus for excitation by controlling the optical pumping
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は光ファイバ増幅器に人力される入力光に励起光
を注入して、同入力光を増幅するようにした光増幅方法
に関するものであり、光通信などで使用されるものであ
る。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an optical amplification method in which pumping light is injected into input light input to an optical fiber amplifier to amplify the input light. , used in optical communications, etc.
（在米技術）
光ファイバ増幅器として希土類添加ファイバを用いた従
来の光増幅方法は、第２図のように入力光ａと励起光源
２からの励起光すとを光合流器３により混合して光ファ
イバ増幅器ｌに入力し、同光ファイバ増幅器１が励起光
すのエネルギーを吸収し、そのエネルギーにより入力光
ａを増幅して出力するようにしである。(U.S.-based technology) The conventional optical amplification method using a rare earth-doped fiber as an optical fiber amplifier mixes input light a and pump light from a pump light source 2 using an optical combiner 3, as shown in Fig. 2. The optical fiber amplifier 1 absorbs the energy of the pumping light A, and uses that energy to amplify the input light A and output it.
（発明が解決しようとする課題）
従来の光増幅方法では光ファイバ増幅器ｌにより増幅さ
れた信号がそのまま出力光Ｃとして取り出されるため１
例えば光ファイバ増幅３１や励起光源２等の周囲の１度
変化によって励起光パワーが変化したり、光合流器３の
通過損失が変化したりして同増幅器１の利得係数が変化
すると、その変化に応じて、入力光が一定でも出力光の
レベルが変動し、伝送系として不安定になる。(Problems to be Solved by the Invention) In the conventional optical amplification method, the signal amplified by the optical fiber amplifier l is extracted as is as the output light C.
For example, if the pumping light power changes due to a 1 degree change in the surroundings of the optical fiber amplifier 31 or the pumping light source 2, or if the passage loss of the optical combiner 3 changes and the gain coefficient of the amplifier 1 changes, the change Accordingly, even if the input light is constant, the level of the output light fluctuates, making the transmission system unstable.
（発明の目的）
本発明の目的は、光ファイバ増幅Ｈ１から出力された出
力光の光１に応じて、励起光すの光層を自動Ａ整して、
光ファイバ増幅器１や励起光源２等の周囲温度が変化し
ても常に安定した利得係数が得られるようにした光増幅
方法を実現することにある。(Object of the Invention) The object of the present invention is to automatically adjust the optical layer of the pumping light according to the output light 1 output from the optical fiber amplifier H1,
The object of the present invention is to realize an optical amplification method that can always obtain a stable gain coefficient even if the ambient temperature of an optical fiber amplifier 1, a pumping light source 2, etc. changes.
（間居点を解決するための手段）
本発明の光増幅方法は第１図のように、入力光ａと励起
光すとを合成して希土類元素添加光ファイバを用いた光
ファイバ増幅器ｌに入力し、前記入力光ａを同光ファイ
バ増幅器ｌにより増幅して出力するようにした光増幅方
法において、前記光ファイバ増幅器ｌからの出力光Ｃの
一部を取り出してモニタ光ｄとし、このモニタ光ｄのレ
ベルに応じて励起光すの光量を自動調整するようにした
ものである。(Means for solving the gap) As shown in FIG. 1, the optical amplification method of the present invention combines input light a and excitation light S to an optical fiber amplifier L using a rare-earth element-doped optical fiber. In the optical amplification method, a part of the output light C from the optical fiber amplifier L is taken out as monitor light d, and the input light a is amplified by the same optical fiber amplifier l and outputted. The amount of excitation light is automatically adjusted according to the level of light d.
（作用）
本発明の光増幅方法では光ファイバ増幅器ｌからの出力
光Ｃの一部を取り出し、取り出されたモニタ光ｄのレベ
ルに応じて励起光すの光量が自動調整されるので、光フ
ァイバ増幅器ｌや励起光源２等の周囲温度の変化により
励起光パワーが変化したり、光合流器３の通過損失が変
化したりして同増幅器ｌの利得係数が変化しても、その
変化に応じて出力光Ｃのレベルが自動的に調節され、同
増幅器ｌから安定した出力光Ｃが得られる。(Function) In the optical amplification method of the present invention, a part of the output light C from the optical fiber amplifier l is extracted, and the amount of pumping light is automatically adjusted according to the level of the extracted monitor light d. Even if the pumping light power changes due to a change in the ambient temperature of the amplifier l, the pumping light source 2, etc., or the passage loss of the optical combiner 3 changes, and the gain coefficient of the amplifier l changes, the gain coefficient of the amplifier l changes according to the change. The level of the output light C is automatically adjusted, and a stable output light C can be obtained from the amplifier l.
（実施例）
第１図は本発明の光増幅方法の一実施例であり、同図で
は入力光ａと励起光源２からの励起光すとが光合流器３
または光合波器により合流されて、希土類元素添加光フ
ァイバを用いた光ファイバ増幅器ｌに入力される。(Embodiment) FIG. 1 shows an embodiment of the optical amplification method of the present invention, in which the input light a and the pumping light from the pumping light source 2 are
Alternatively, the signals are combined by an optical multiplexer and input to an optical fiber amplifier l using a rare earth element-doped optical fiber.
この光ファイバ増幅器１では励起光すのエネルギーを吸
収し、そのエネルギーにより入力光ａを増幅して出力す
る。This optical fiber amplifier 1 absorbs the energy of the pumping light a, and uses the energy to amplify and output the input light a.
本発明では光ファイバ増幅器ｌの出力光Ｃを光分岐器４
において例えば９対１の割合で分岐しそのうちの９０％
の光ｅはそのまま出力し１分岐された１０％の光をモニ
タ光ｄとして励起光源２に入力する。In the present invention, the output light C of the optical fiber amplifier l is transferred to the optical branching unit 4.
For example, there are 9 to 1 branches, and 90% of them
The light e is outputted as it is, and the 10% light that is branched into one branch is input into the excitation light source 2 as the monitor light d.
励起光源２に入力されたモニタ光ｄは、受光部１１にお
いて電気信号に変換され、電気信号増幅器１２において
（−Ｋ１倍増幅され（Ｋは正の定数）、増幅された信号
が定電流源１３からの一定電流と加算部（例えば差動増
幅器）１４において加算され、加算された電流量に基づ
いて電気／光変換部１５から励起光すが発生される。The monitor light d input to the excitation light source 2 is converted into an electrical signal in the light receiving section 11, and is amplified by (-K1) in the electrical signal amplifier 12 (K is a positive constant), and the amplified signal is sent to the constant current source 13. A constant current from the pump is added to the adder (for example, a differential amplifier) 14, and excitation light is generated from the electric/optical converter 15 based on the added amount of current.
この場合、前記加算により励起光すの光量が光ファイバ
増幅器ｌの利得変化と逆方向に調整される０例えば光フ
ァイバ増幅器１の利得が上るとモニタ光ｄは増＾るが、
電気信号増幅器１２の前記（−Ｋ）倍の作用により電気
／光変換部１５から出力される励起光すが少な（なる、
励起光すが少なくなると光ファイバ増幅器ｌの利得が小
さくなるので同増幅器１からの出力光Ｃが元のレベルに
戻り、光分岐器４から出力される光ｅも元のレベルに戻
る。In this case, the light amount of the pump light d is adjusted by the addition in the opposite direction to the change in the gain of the optical fiber amplifier 1. For example, when the gain of the optical fiber amplifier 1 increases, the monitor light d increases.
Due to the (-K) times the effect of the electric signal amplifier 12, the amount of pumping light output from the electric/optical converter 15 is reduced.
When the amount of pumping light decreases, the gain of the optical fiber amplifier 1 decreases, so that the output light C from the amplifier 1 returns to its original level, and the light e output from the optical splitter 4 also returns to its original level.
逆に、光ファイバ増幅器ｌの利得が下るとモニタ光ｄが
下るが、前記（−Ｋ）倍の作用により電気／光変換部１
５から出力される励起光すは大きくなり、光ファイバ増
幅器１の利得が上り、同増増幅器ｌの出力光Ｃ及び光分
岐器４から出力される九〇が元のレベルに戻る。Conversely, when the gain of the optical fiber amplifier l decreases, the monitor light d decreases, but the electric/optical converter 1
The pumping light S output from 5 becomes larger, the gain of the optical fiber amplifier 1 increases, and the output light C of the amplifier 1 and 90 output from the optical splitter 4 return to their original levels.
このようにして光ファイバ増幅器ｌの利得が自動的に調
整される。In this way, the gain of the optical fiber amplifier l is automatically adjusted.
（発明の効果）
本発明の光増幅方法では１周囲の温度変化により励起光
すのパワーや光合流器３の通過損失が変化して光ファイ
バ増幅器ｌの利得が変化しても、光ファイバ増幅器ｌの
利得が自動的に調整されて同増幅器ｌの利得係数が安定
するので、出力も安定する。(Effects of the Invention) In the optical amplification method of the present invention, even if the power of the pumping light or the passage loss of the optical combiner 3 changes due to a change in the surrounding temperature and the gain of the optical fiber amplifier l changes, the optical fiber amplifier Since the gain of the amplifier l is automatically adjusted and the gain coefficient of the amplifier l is stabilized, the output is also stabilized.
第１図は本発明の光増幅方法の説明図、第２図は従来の
光増幅方法の説明図である。
１は光ファイバ増幅器
ａは入力光
すは励起光
Ｃは出力光
ｄはモニタ光FIG. 1 is an explanatory diagram of the optical amplification method of the present invention, and FIG. 2 is an explanatory diagram of the conventional optical amplification method. 1 is the optical fiber amplifier a is the input light, pumping light C is the output light d is the monitor light
Claims (1)
ァイバを用いた光ファイバ増幅器１に入力し、それを同
光ファイバ増幅器１により増幅して出力するようにした
光増幅方法において、前記光ファイバ増幅器１からの出
力光ａの一部を取り出してモニタ光ｄとし、このモニタ
光ｄのレベルに応じて励起光ｂの光量を自動調整するよ
うにしたことを特徴とする光増幅方法。In an optical amplification method, input light a and excitation light b are combined, input to an optical fiber amplifier 1 using a rare earth element-doped optical fiber, and amplified by the optical fiber amplifier 1 and outputted. An optical amplification method characterized in that a part of the output light a from the optical fiber amplifier 1 is extracted and used as monitor light d, and the amount of pumping light b is automatically adjusted according to the level of the monitor light d. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13974989A JPH035731A (en) | 1989-06-01 | 1989-06-01 | Light amplifying method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13974989A JPH035731A (en) | 1989-06-01 | 1989-06-01 | Light amplifying method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH035731A true JPH035731A (en) | 1991-01-11 |
Family
ID=15252491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13974989A Pending JPH035731A (en) | 1989-06-01 | 1989-06-01 | Light amplifying method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH035731A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2674071A1 (en) * | 1991-03-15 | 1992-09-18 | Mitsubishi Electric Corp | Amplifier for optical fibre and amplification method |
| US5223705A (en) * | 1992-08-12 | 1993-06-29 | At&T Bell Laboratories | Measurement of an optical amplifier parameter with polarization |
| US5260819A (en) * | 1990-06-16 | 1993-11-09 | Northern Telecom Limited | Digital telemetry system and method for fault detection in optical transmission system |
| EP0717302A3 (en) * | 1994-12-15 | 1997-08-13 | Anritsu Corp | External stabilization of the output power of a tunable wavelength light source |
-
1989
- 1989-06-01 JP JP13974989A patent/JPH035731A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5260819A (en) * | 1990-06-16 | 1993-11-09 | Northern Telecom Limited | Digital telemetry system and method for fault detection in optical transmission system |
| FR2674071A1 (en) * | 1991-03-15 | 1992-09-18 | Mitsubishi Electric Corp | Amplifier for optical fibre and amplification method |
| US5223705A (en) * | 1992-08-12 | 1993-06-29 | At&T Bell Laboratories | Measurement of an optical amplifier parameter with polarization |
| EP0717302A3 (en) * | 1994-12-15 | 1997-08-13 | Anritsu Corp | External stabilization of the output power of a tunable wavelength light source |
| US5754571A (en) * | 1994-12-15 | 1998-05-19 | Anritsu Corporation | Tunable wavelength light source apparatus for stabilizing power intensity by using external auto-power control |
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