JPS6157744B2 - - Google Patents
Info
- Publication number
- JPS6157744B2 JPS6157744B2 JP56210186A JP21018681A JPS6157744B2 JP S6157744 B2 JPS6157744 B2 JP S6157744B2 JP 56210186 A JP56210186 A JP 56210186A JP 21018681 A JP21018681 A JP 21018681A JP S6157744 B2 JPS6157744 B2 JP S6157744B2
- Authority
- JP
- Japan
- Prior art keywords
- optical
- amplification medium
- wavelength
- scattering amplification
- bidirectional
- 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.)
- Expired
Links
- 230000003287 optical effect Effects 0.000 claims description 38
- 230000003321 amplification Effects 0.000 claims description 15
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 15
- 230000002457 bidirectional effect Effects 0.000 claims description 10
- 239000013307 optical fiber Substances 0.000 claims description 8
- 230000005284 excitation Effects 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 229910005793 GeO 2 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/2912—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing
- H04B10/2916—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing using Raman or Brillouin 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
- H01S3/30—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects
- H01S3/302—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range using scattering effects, e.g. stimulated Brillouin or Raman effects in an optical fibre
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Optical Communication System (AREA)
Description
【発明の詳細な説明】
本発明は双方向光増巾器、特に光フアイバ通信
の中継装置等で用いられる双方向光増幅器に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bidirectional optical amplifier, and more particularly to a bidirectional optical amplifier used in a relay device for optical fiber communication.
光フアイバの低伝送損失特性を利用した光フア
イバ通信方式は近年急速に実用化が進み、400M
ｂ／ｓの高速伝送を40〜50Km無中継で行なえるまで
になつた。このような光フアイバ通信方式の特徴
を活かした多中継の長距離伝送技術また光フアイ
バを有効利用するための光波長多重技術や光双方
向伝送技術の開発が進められている。 Optical fiber communication systems that utilize the low transmission loss characteristics of optical fibers have been rapidly put into practical use in recent years, and
It has become possible to perform b/s high-speed transmission for 40 to 50 km without repeating. The development of multi-reply, long-distance transmission technology that takes advantage of the characteristics of such optical fiber communication systems, as well as optical wavelength division multiplexing technology and optical bidirectional transmission technology that make effective use of optical fibers, is underway.
ところで、従来の光中継装置では適当な光増幅
器が得られないなどの理由から、ほとんどすべて
光信号を電気信号に変換した後、電気信号で増幅
また信号処理を施し、再び光信号に変換して送出
するという方式を採つている。光中継用の増幅器
として半導体レーザ素子を利用する方式が従来い
くつか提案されているものの、利得が小さい、あ
るいは増幅波長帯域が狭い、またレーザ発振を抑
制する手段が必要などといつた欠点を有し、実用
化が遅れている。 By the way, because conventional optical repeaters do not have suitable optical amplifiers, almost all optical signals are converted into electrical signals, and then the electrical signals are amplified and processed, and then converted back into optical signals. The method is to send out the information. Although several methods have been proposed in the past that use semiconductor laser elements as amplifiers for optical repeaters, they have drawbacks such as low gain, narrow amplification wavelength band, and the need for means to suppress laser oscillation. However, practical application has been delayed.
本発明の目的は上述の欠点を除去し、電気信号
を介しない直接光信号領域で動作する双方向光増
幅器を提供することにある。 SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and to provide a bidirectional optical amplifier that operates in the direct optical signal region without using electrical signals.
本発明によれば二つの入出力端部を有する誘導
散乱増幅媒体と、前記入出力端部に設けられた光
合波分波器と、該光合波分波器の一方によつて前
記誘導散乱増幅媒体と結合されている励起光源と
を含む双方向光増幅器が得られる。 According to the present invention, the stimulated scattering amplification medium has two input/output ends, an optical multiplexer/demultiplexer provided at the input/output end, and one of the optical multiplexer/demultiplexers. A bidirectional optical amplifier is obtained that includes a pump light source coupled to a medium.
次に図面を参照して本発明を詳細に説明する。
第１図は本発明の一実施例の構成図である。本実
施例はSiO2−GeO2系ガラスから成る直径５μｍ
のコアを有し、高次モード遮断波長１μｍの単一
モード光フアイバを誘導散乱増幅媒体１０に用
い、その入出力端部に設けられた第一光合波分波
器１１と、第二光合波分波器１４および、光アイ
ソレータ１８及び第一光合波分波器１１を介して
誘導散乱増幅媒体１０と結合されている1.32μｍ
で連続発振するYACレーザを用いた励起光源１
９、励起光を有効に利用するための反射鏡１７、
及び各要素を効率的に結合するための光学系１
２，１３，１５，１６とから構成されている。第
一及び第二光合波分波器１１，１４はいずれも励
起光と信号光を合波及び分波するためのものであ
つて、その形式は問わないが、本実施例では励起
光の1.32μｍ波長以下の波長光を反射し、それ以
上の波長光を透過するフイルタを使用している。 Next, the present invention will be explained in detail with reference to the drawings.
FIG. 1 is a block diagram of an embodiment of the present invention. This example is made of SiO 2 -GeO 2 glass with a diameter of 5 μm.
A single mode optical fiber having a core of 1.32 μm coupled to the stimulated scattering amplification medium 10 via the demultiplexer 14, the optical isolator 18, and the first optical multiplexer/demultiplexer 11
Excitation light source 1 using a YAC laser that continuously oscillates at
9. Reflector 17 for effectively utilizing excitation light;
and an optical system 1 for efficiently combining each element.
It is composed of 2, 13, 15, and 16. Both of the first and second optical multiplexer/demultiplexers 11 and 14 are for multiplexing and demultiplexing pump light and signal light. A filter is used that reflects light with wavelengths below μm wavelength and transmits light with wavelengths longer than that.
さて本実施例の増幅波長帯域である1.36〜1.40
μｍ帯の光である波長1.36μｍの信号光を光学系
１３を通して第一光合波分波器１１へ導入し励起
光源１９からの波長1.32μｍの励起光と合波して
誘導散乱増幅媒体１０へ入射すると第二光合波分
波器１４の部分では増幅された波長1.36μｍの信
号光と、透過した波長1.32μｍの励起光が得ら
れ、信号は光学系１５を通して出力される。透過
励起光は反射鏡１７で反射され、今度は光学系１
５を通して導入された別の信号光、例えば波長
1.40μｍの信号光と合波されて誘導散乱増幅媒体
１０へ入射され増幅された後、第一光合波分波器
１１によつて励起光成分と信号光成分とに分離さ
れて、信号光は光学系１３を通して出力される。 Now, the amplification wavelength band of this example is 1.36 to 1.40.
Signal light with a wavelength of 1.36 μm, which is light in the μm band, is introduced into the first optical multiplexer/demultiplexer 11 through the optical system 13, where it is combined with the pump light with a wavelength of 1.32 μm from the pump light source 19 and sent to the stimulated scattering amplification medium 10. When the light enters the second optical multiplexer/demultiplexer 14, an amplified signal light with a wavelength of 1.36 μm and a transmitted pump light with a wavelength of 1.32 μm are obtained, and the signal is outputted through the optical system 15. The transmitted excitation light is reflected by the reflecting mirror 17, and then the optical system 1
Another signal light introduced through 5, e.g. wavelength
After being multiplexed with a 1.40 μm signal light and entering the stimulated scattering amplification medium 10 for amplification, the first optical multiplexer/demultiplexer 11 separates the signal light into a pumping light component and a signal light component. It is output through the optical system 13.
後方散乱利得を利用するだけに留めれば、反射
鏡１７は必要ないが、反射鏡１７を用いることに
より双方向でほぼ一様な高利得30〜40dBが実現
できるという利点がある。 If only the backscattering gain is used, the reflector 17 is not necessary, but the use of the reflector 17 has the advantage that a high gain of 30 to 40 dB that is substantially uniform in both directions can be achieved.
本実施例は、光中継が完全に光領域で行なわれ
るという特徴に加えて、信号光の波長を増幅波長
帯域内の任意に選べること、また励起光の波長を
適当に設定することによつて増幅波長帯域も適当
に設定可能であること、また時間応答が極めて高
速であつてほとんど伝送速度に依存しない双方向
増幅器であることなどの利点を有する。 In addition to the feature that the optical relay is performed completely in the optical domain, this embodiment has the advantage that the wavelength of the signal light can be arbitrarily selected within the amplification wavelength band, and the wavelength of the pumping light can be appropriately set. It has the advantage that the amplification wavelength band can be appropriately set, and that it is a bidirectional amplifier with extremely fast time response and almost independent of transmission speed.
なお誘導散乱増幅媒体としては多モード光フア
イバを用いることも可能であるが、位相整合条件
を満足する相互作用長が短かく高い利得を必要と
する場合には不適当である。 Although it is possible to use a multimode optical fiber as the stimulated scattering amplification medium, it is not suitable when the interaction length that satisfies the phase matching condition is short and high gain is required.
本発明によれば以上説明したように電気信号を
介しない直接光信号領域で動作する双方向光増巾
器が得られる。 According to the present invention, as described above, it is possible to obtain a bidirectional optical amplifier that operates in the direct optical signal region without using electrical signals.
第１図は本発明の一実施例の構成図である。
１０……誘導散乱増幅媒体、１１……第一光合
波分波器、１４……第二光合波分波器、１７……
反射鏡、１８……光アイソレータ、１９……励起
光源、１２，１３，１５，１６……光学系。
FIG. 1 is a block diagram of an embodiment of the present invention. 10... Stimulated scattering amplification medium, 11... First optical multiplexer/demultiplexer, 14... Second optical multiplexer/demultiplexer, 17...
Reflector, 18... Optical isolator, 19... Excitation light source, 12, 13, 15, 16... Optical system.
Claims (1)
と、前記入出力端部に設けられた光合波分波器
と、該光合波分波器の一方によつて前記誘導散乱
増幅媒体と結合されている励起光源とを含む双方
向光増幅器。 ２ 誘導散乱増幅媒体が単一モード光フアイバで
ある特許請求の範囲第１項記載の双方向光増幅
器。 ３ 入出力端部の一方に励起光を反射し再び誘導
散乱増幅媒体中へ戻す手段を設けた特許請求の範
囲第１項記載の双方向光増幅器。[Claims] 1. A stimulated scattering amplification medium having two input/output ends, an optical multiplexer/demultiplexer provided at the input/output end, and one of the optical multiplexer/demultiplexers. A bidirectional optical amplifier including a pump light source coupled to a scattering amplification medium. 2. The bidirectional optical amplifier according to claim 1, wherein the stimulated scattering amplification medium is a single mode optical fiber. 3. The bidirectional optical amplifier according to claim 1, wherein one of the input and output ends is provided with means for reflecting the excitation light and returning it to the stimulated scattering amplification medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56210186A JPS58115948A (en) | 1981-12-29 | 1981-12-29 | Bidirectional optical amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56210186A JPS58115948A (en) | 1981-12-29 | 1981-12-29 | Bidirectional optical amplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58115948A JPS58115948A (en) | 1983-07-09 |
| JPS6157744B2 true JPS6157744B2 (en) | 1986-12-08 |
Family
ID=16585203
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56210186A Granted JPS58115948A (en) | 1981-12-29 | 1981-12-29 | Bidirectional optical amplifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58115948A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4674830A (en) * | 1983-11-25 | 1987-06-23 | The Board Of Trustees Of The Leland Stanford Junior University | Fiber optic amplifier |
| GB8709073D0 (en) * | 1987-04-15 | 1987-05-20 | British Telecomm | Coherent optical systems |
| JP2747315B2 (en) * | 1989-02-22 | 1998-05-06 | 日立電線株式会社 | Glass waveguide amplifier for bidirectional transmission |
| JP3137632B2 (en) * | 1989-08-31 | 2001-02-26 | 富士通株式会社 | Optical communication system with optical fiber amplifier |
| JP2744668B2 (en) * | 1989-11-17 | 1998-04-28 | 三菱電機株式会社 | Optical signal receiver |
| US5355249A (en) * | 1992-04-21 | 1994-10-11 | Matsushita Electric Industrial Co., Ltd. | Optical passive components |
| US6690507B2 (en) | 2002-01-30 | 2004-02-10 | Corning Incorporated | Double-pumped raman amplifier |
-
1981
- 1981-12-29 JP JP56210186A patent/JPS58115948A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58115948A (en) | 1983-07-09 |
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