JPH02308581A - Light amplification - Google Patents
Light amplificationInfo
- Publication number
- JPH02308581A JPH02308581A JP1128961A JP12896189A JPH02308581A JP H02308581 A JPH02308581 A JP H02308581A JP 1128961 A JP1128961 A JP 1128961A JP 12896189 A JP12896189 A JP 12896189A JP H02308581 A JPH02308581 A JP H02308581A
- Authority
- JP
- Japan
- Prior art keywords
- light
- input
- output
- optical
- monitor
- 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
- 230000003321 amplification Effects 0.000 title claims abstract description 23
- 238000003199 nucleic acid amplification method Methods 0.000 title claims abstract description 23
- 230000003287 optical effect Effects 0.000 claims abstract description 35
- 239000013307 optical fiber Substances 0.000 claims abstract description 28
- 238000005086 pumping Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 18
- 230000005284 excitation Effects 0.000 abstract description 12
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 230000005611 electricity Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000004065 semiconductor 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
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
-
- 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
- H01S3/1301—Stabilisation of laser output parameters, e.g. frequency or amplitude in optical amplifiers
- H01S3/13013—Stabilisation of laser output parameters, e.g. frequency or amplitude in optical amplifiers by controlling the optical pumping
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、希を類添加光ファイバ等の光ファイバ増幅器
に入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
信や光計測等に使用されるものである。Detailed Description of the Invention (Field of Industrial Application) The present invention is directed to amplifying the input light by injecting pumping light into the input light input to an optical fiber amplifier such as a rare-doped optical fiber. This invention relates to an optical amplification method used in optical communication, optical measurement, etc.
（従来技術）
希七類添加光ファイバ等を光ファイバ増幅器として用い
た光増幅方法の主なものとしては第２図に示すようなも
のがある。第２図の光増幅方法は入力光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ｉｔ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
を増幅して出力光Ｃとするものである。(Prior Art) The main optical amplification method using a heptad-doped optical fiber or the like as an optical fiber amplifier is shown in FIG. 2. The optical amplification method shown in Figure 2 is based on the input light a and the pumping light source 2.
The pumping light A is mixed by the optical combiner 3 and input to the optical fiber amplifier L, which absorbs the energy of the pumping light A, and uses that energy to transform the input light A.
The output light C is amplified.
この光増幅方法では光ファイバ増幅器ｌにより増幅され
た光がそのまま出力光Ｃとして取り出されるため５例え
ば光ファイバ増幅器１や励起光源２等の周囲の温度変化
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ｌの利得係数が変化す
ると、その変化に応じて、入力光ａ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という問題
があった。In this optical amplification method, the light amplified by the optical fiber amplifier 1 is extracted as is as the output light C.5 For example, the pumping light power may change due to changes in the surrounding temperature of the optical fiber amplifier 1, the pumping light source 2, etc. If the gain coefficient of amplifier l changes due to a change in the passage loss of amplifier 3, the level of the output light will vary even if the input light a is constant, and the transmission system will become unstable. There was a problem.
ぞでで本件出願人は先に第３図のような光増幅方法を開
発した。これは入力光ａと励起光すとを合成して光ファ
イバ増幅器１に入力し、前記入力光ａを同増幅器ｌによ
り増幅しぞ同増幅器ｌから出力光Ｃとして出力し、その
一部を光分岐器４により取り出してモニタｋｅとし、こ
のモニタ光ｅを光・電気変換器Ｉｔにより電気信号に変
換し、それを電気信号増幅器１２で増幅し、この増幅さ
れた信号が定電流源１３からの一定電流と差動増幅器１
４において加算し、この加算した定電流に塙づいて光＠
調整された励起光すが電気・光変換部（励起光出力部）
１５から発生され、この励起光すにより光ファイバ増幅
器ｌの利得を調整するようにしたものである。The applicant of the present invention previously developed an optical amplification method as shown in Figure 3. This combines input light a and pumping light S and inputs it into optical fiber amplifier 1, and the input light a is amplified by amplifier l, which outputs it as output light C, and part of it is optically The monitor light e is taken out by a splitter 4 and used as a monitor ke, and this monitor light e is converted into an electrical signal by an optical-to-electrical converter It, which is amplified by an electrical signal amplifier 12, and this amplified signal is output from a constant current source 13. Constant current and differential amplifier 1
4, and the added constant current is followed by light @
Adjusted excitation light Suga electrical/optical conversion section (excitation light output section)
15, and the gain of the optical fiber amplifier l is adjusted by this pumping light.
（発明が解決しようとする課題）
しかし、前記光増幅方法では光ファイバ増幅器【の利得
そのものが調整されるため、入力光レベルが変化した場
合でも出力光レベルが一定になる。このため前記光増幅
方法は、入力光レベルの変化に依存せずに常に利得が一
定な光増幅器が要求される測定器分野では使用すること
が出来ないという問題があった。(Problem to be Solved by the Invention) However, in the optical amplification method, the gain itself of the optical fiber amplifier is adjusted, so even if the input light level changes, the output light level remains constant. For this reason, the optical amplification method described above cannot be used in the field of measuring instruments, which requires an optical amplifier whose gain is always constant regardless of changes in the input light level.
（発明の目的）
本発明の目的は、光ファイバ増幅器や励起光源等の周囲
の温度変化によって、励起光パワーが変化したり、光合
流器の通過損失が変化したりしても、また入力光が変化
しても光ファイバ増幅器の利得が常に一定になるように
した光増幅方法を提供することにある。(Objective of the Invention) The object of the present invention is to prevent the input light from changing even if the pumping light power changes or the passage loss of the optical combiner changes due to temperature changes around the optical fiber amplifier or pumping light source. An object of the present invention is to provide an optical amplification method in which the gain of an optical fiber amplifier is always constant even when the gain of an optical fiber amplifier changes.
（間開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
光すとを合成して光ファイバ増幅ｉｔに入力し、前記入
力光ａを同増幅器ｌにより増幅して出力光〇とするよう
にした光増幅方法において、前記入力光ａの一部を取り
出して大力モニタ光ｄとし、前記出力光Ｃの一部を取り
出して出力モニタ光ｅとし、両モニタ光ｄ、ｅのレベル
比をｒ−め設定されている基準値と比較して、同レベル
比がＪｉｉ ｌ （ＩＮと一致するように励起光すの出
力パワーを自動調整するようにしたものである。(Means for solving gap gap) The optical amplification method of the present invention, as shown in FIG. In the optical amplification method, a part of the input light a is taken out as the output light d and a part of the output light C is taken out as the output monitor light e. Then, the level ratio of both monitor lights d and e is compared with the reference value set r-me, and the output power of the pump light is automatically adjusted so that the same level ratio matches Jii l (IN). This is what I did.
（作用）
本発明の光増幅方法は、入力光ａの一部を入力モニタ光
ｄとし、出力光Ｃの一部を出力モニタ光ｅとし１両モニ
タ光ｄ、ｅのレベル比が予め設定されている基準値と一
致するように、励起光すの出力パワーを自動調整される
ため、先ファイバ増幅ｋｌ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も、また、入力光が変化しても
先ファイバ増幅器ｌの利得は常に一定となる。(Function) In the optical amplification method of the present invention, a part of the input light a is used as the input monitor light d, a part of the output light C is used as the output monitor light e, and the level ratio of the two monitor lights d and e is set in advance. Since the output power of the pumping light is automatically adjusted to match the reference value set by Even if the transmission loss of the fiber amplifier l changes, or even if the input light changes, the gain of the fiber amplifier l remains constant.
ちなみに、入力モニタ光ｄと出力モニタ光ｅの比をＤと
し、予め設定された値をＡとすると、Ｄ＜Ａのときは励
起光を増やす。Incidentally, if the ratio of the input monitor light d and the output monitor light e is D and the preset value is A, the pumping light is increased when D<A.
Ｄ＞Ａのときは励起光を減らす。When D>A, reduce the excitation light.
Ｄ＝Ａのときは励起光をそのまま維持する。When D=A, the excitation light is maintained as it is.
ことにより、Ｄ＝Ａを保つ。By doing so, D=A is maintained.
（実施例）
第１図は本発明の光増幅方法の一例であり、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２”５１に人力される。この
光ファイバ増幅器ｌはエルビウムを添加した光ファイバ
でも半導体レーザを用いた進行波型光増幅器でも良い。(Example) FIG. 1 shows an example of the optical amplification method of the present invention. In the figure, input light a and pumping light from a pumping light source 2 are combined by an optical combiner 3 or an optical multiplexer. It is manually powered by an optical fiber amplifier 2''51 using an element-doped optical fiber.This optical fiber amplifier l may be an erbium-doped optical fiber or a traveling wave optical amplifier using a semiconductor laser.
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を増幅して出力光
Ｃを出力する。This optical fiber amplifier 1 absorbs the energy of the pump light S, uses the energy to amplify the input light a, and outputs the output light C.
本発明では入力光ａの一部を光分岐器５において例えば
９対ｌの割合で分岐する。そのうち９０％の光ａはその
まま光合流器３に入れ、光合流器３で励起光源２から出
力される励起光すと合流させて光ファイバ増幅器ｌに入
力する。一方１分岐された１０％の光はモニタ光ｄとし
て励起光源２の入力端光・電気変換部２１に入力して電
気信号に変換し１次の割算回路（例えば演算増幅器）２
３に人力される２゜
また、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ｌの割合で分岐しく分岐する
比率は入力光ａの場合と同じとする）、そのうちの９０
％の光Ｃはそのまま出力し１分岐された１０％の光をモ
ニタ光ｅとして励起光ｆＡ２の出力側光・電気変換部２
２に人力して電気信号に変換し、前記割算回路２３に入
力される。この割算回路２３では大力モニタ光ｄによる
電気信号と出力モニタ光ｅによる電気信号との比が求め
られる。即ち、出力モニタ光ｅ／人カモニタ光ｄの値が
電圧値りとして算出され、次の比較回路（例えば演算増
幅器）２４に入力されて、基準電圧発生部２５で設定さ
れている基ｌ′！！電圧と比較される。In the present invention, a part of the input light a is split in the optical splitter 5 at a ratio of, for example, 9:1. 90% of the light a enters the optical combiner 3 as it is, where it is combined with the pumping light output from the pumping light source 2 and input to the optical fiber amplifier l. On the other hand, 10% of the light branched into one branch is input as monitor light d to the input end optical-to-electrical converter 21 of the excitation light source 2, where it is converted into an electrical signal and sent to the primary division circuit (for example, an operational amplifier) 2.
In addition, in the present invention, the ratio at which the output light C of the optical fiber amplifier l is branched in the optical splitter 4 at a ratio of, for example, 9 to l is the same as that for the input light a), 90 of them
% of the light C is output as is, and the 10% light that is branched into one is used as the monitor light e to the output side optical-to-electrical converter 2 of the excitation light fA2.
2, the signal is manually converted into an electrical signal, and the signal is input to the division circuit 23. This dividing circuit 23 calculates the ratio between the electrical signal caused by the high-power monitor light d and the electrical signal caused by the output monitor light e. That is, the value of the output monitor light e/person monitor light d is calculated as a voltage value, is input to the next comparison circuit (for example, an operational amplifier) 24, and is input to the base l'! set by the reference voltage generator 25. ! compared to voltage.
基準電圧発生部２５は予め望まれる増幅率（例えば２０
倍）に相当する電圧（基準電圧）Ａが設定されている。The reference voltage generator 25 has a predetermined amplification factor (for example, 20
A voltage (reference voltage) A corresponding to
比較された結果が電圧として電気・光変換部（励起光出
力部）１５に入力され、その入力端子に応じて励起光す
のパワーが増減され、同励起光すが光合成器３を通して
入力光ａと合成され、光ファイバ増幅器ｌの利得が一定
に調整される。The comparison result is input as a voltage to the electric/optical converter (pumping light output part) 15, and the power of the pumping light is increased or decreased depending on the input terminal, and the pumping light is converted into input light a through the optical combiner 3. The gain of the optical fiber amplifier l is adjusted to a constant value.
（発明の効果） 本発明の光増幅方法は次のようなりｈ渠がある。(Effect of the invention) The optical amplification method of the present invention has the following features.
■、光ファイバ増幅器ｌや励起光源２等の周囲温度が変
化しても、また、入力光レベルが変化しても、それらの
変化に依存せずに光ファイバ増幅２３１の増幅率が一定
となる。このため安定した出力が得られ、また、入力光
の変化に依存することな（常に一定な利得の光ファイバ
増幅器が要求される測定器分野でも使用可能となる。(2) Even if the ambient temperature of the optical fiber amplifier 1, the pumping light source 2, etc. changes, or the input light level changes, the amplification factor of the optical fiber amplifier 231 remains constant regardless of these changes. . Therefore, a stable output can be obtained, and it can also be used in the field of measuring instruments, where an optical fiber amplifier with a constant gain that does not depend on changes in input light is required.
■、出出力モニタ光０大
較される基＄値を変えることにより光ファイバ増幅器の
増幅率を容易に変えることができる。(2) The amplification factor of the optical fiber amplifier can be easily changed by changing the base value to which the output output monitor light is compared.
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、第３図は本件発明イらが先に開発
した光増幅方法の説明図である。
ｌは光ファイバ増幅器
ａは入力光
すは励起光
Ｃは出向先
ｄは人力モニタ光
ｅは出力モニタ光FIG. 1 is an explanatory diagram of the optical amplification method of the present invention, FIG. 2 is an explanatory diagram of the conventional optical amplification method, and FIG. 3 is an explanatory diagram of the optical amplification method previously developed by the present inventors. l is the optical fiber amplifier a is the input light, pump light C is the destination d is the human power monitor light e is the output monitor light
Claims (1)
入力し、前記入力光ａを同増幅器１により増幅して出力
光ｃとするようにした光増幅方法において、前記入力光
ａの一部を取り出して入力モニタ光ｄとし、前記出力光
ｃの一部を取り出して出力モニタ光ｅとし、両モニタ光
ｄ、ｅのレベル比を予め設定されている基準値と比較し
て、同レベル比が基準値と一致するように励起光ｂの出
力パワー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 pump light b are combined and input to an optical fiber amplifier 1, and the input light a is amplified by the same amplifier 1 to produce an output light c. A part of the output light c is taken out as the input monitor light d, a part of the output light c is taken out as the output monitor light e, and the level ratio of both monitor lights d and e is compared with a preset reference value. An optical amplification method characterized in that the output power of pumping light b is automatically adjusted so that the level ratio matches a reference value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1128961A JPH02308581A (en) | 1989-05-24 | 1989-05-24 | Light amplification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1128961A JPH02308581A (en) | 1989-05-24 | 1989-05-24 | Light amplification |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02308581A true JPH02308581A (en) | 1990-12-21 |
Family
ID=14997696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1128961A Pending JPH02308581A (en) | 1989-05-24 | 1989-05-24 | Light amplification |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02308581A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04251827A (en) * | 1991-01-29 | 1992-09-08 | Nec Corp | Optical amplification system and device |
| JPH0521881A (en) * | 1991-07-17 | 1993-01-29 | Nec Corp | Optical fiber amplifier |
| JPH0537066A (en) * | 1991-08-01 | 1993-02-12 | Nec Corp | Light repeater |
| EP0871302A2 (en) * | 1997-03-28 | 1998-10-14 | Lucent Technologies Inc. | Dynamic gain control system for optical amplifier and method thereof |
| EP1283567A2 (en) * | 2001-07-10 | 2003-02-12 | Samsung Electronics Co., Ltd. | Automatic gain control device of optical fiber amplifier |
| EP1394970A3 (en) * | 2002-08-30 | 2006-01-11 | Sumitomo Electric Industries, Ltd. | Optical amplifier, gain control method and circuit for an optical amplifier |
| CN1318909C (en) * | 2002-08-30 | 2007-05-30 | 住友电气工业株式会社 | Light amplifier, gain-control method for light amplifier and electric circuit |
| US7538937B2 (en) | 2002-03-14 | 2009-05-26 | Nippon Telegraph And Telephone | Optical amplifier |
-
1989
- 1989-05-24 JP JP1128961A patent/JPH02308581A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04251827A (en) * | 1991-01-29 | 1992-09-08 | Nec Corp | Optical amplification system and device |
| JPH0521881A (en) * | 1991-07-17 | 1993-01-29 | Nec Corp | Optical fiber amplifier |
| JPH0537066A (en) * | 1991-08-01 | 1993-02-12 | Nec Corp | Light repeater |
| EP0871302A2 (en) * | 1997-03-28 | 1998-10-14 | Lucent Technologies Inc. | Dynamic gain control system for optical amplifier and method thereof |
| EP0871302A3 (en) * | 1997-03-28 | 1998-11-25 | Lucent Technologies Inc. | Dynamic gain control system for optical amplifier and method thereof |
| US5923462A (en) * | 1997-03-28 | 1999-07-13 | Lucent Technologies Inc. | Dynamic gain control system for optical amplifier and method thereof |
| EP1283567A2 (en) * | 2001-07-10 | 2003-02-12 | Samsung Electronics Co., Ltd. | Automatic gain control device of optical fiber amplifier |
| EP1283567A3 (en) * | 2001-07-10 | 2003-12-17 | Samsung Electronics Co., Ltd. | Automatic gain control device of optical fiber amplifier |
| US7538937B2 (en) | 2002-03-14 | 2009-05-26 | Nippon Telegraph And Telephone | Optical amplifier |
| US7589888B2 (en) | 2002-03-14 | 2009-09-15 | Nippon Telegraph And Telephone Corporation | Optical amplifier having a constant gain profile |
| EP1394970A3 (en) * | 2002-08-30 | 2006-01-11 | Sumitomo Electric Industries, Ltd. | Optical amplifier, gain control method and circuit for an optical amplifier |
| CN1318909C (en) * | 2002-08-30 | 2007-05-30 | 住友电气工业株式会社 | Light amplifier, gain-control method for light amplifier and electric circuit |
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