JPH06302921A - Optical amplifier - Google Patents
Optical amplifierInfo
- Publication number
- JPH06302921A JPH06302921A JP10997693A JP10997693A JPH06302921A JP H06302921 A JPH06302921 A JP H06302921A JP 10997693 A JP10997693 A JP 10997693A JP 10997693 A JP10997693 A JP 10997693A JP H06302921 A JPH06302921 A JP H06302921A
- Authority
- JP
- Japan
- Prior art keywords
- wavelength
- optical
- optical fiber
- amplifier
- gain
- 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
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
- H01S2301/00—Functional characteristics
- H01S2301/04—Gain spectral shaping, flattening
-
- 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
- H01S3/06758—Tandem amplifiers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0221—Power control, e.g. to keep the total optical power constant
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は光励起により光増幅作用
を示す希土類元素イオンがドープされた光ファイバ増幅
器を用いた光増幅装置に関するものであり、主として光
通信において光信号を増幅するのに利用されるものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical amplifying device using an optical fiber amplifier doped with a rare earth element ion exhibiting an optical amplifying effect by photoexcitation, and is mainly used for amplifying an optical signal in optical communication. It is what is done.
【０００２】[0002]
【従来の技術】希土類元素イオンがドープされた光ファ
イバ増幅器は光−電気変換を伴わずに光パワーを増幅で
きるので利便性が良く、将来の光通信に必要不可欠なデ
バイスである。特に、増幅媒質しとして例えばエルビウ
ムを使用したエルビウムドープファイバ増幅器は光通信
に用いられる１．５５μｍ帯に利得を有するため、現在
盛んに研究が行われている。2. Description of the Related Art An optical fiber amplifier doped with rare earth element ions is convenient because it can amplify optical power without optical-electrical conversion and is an essential device for future optical communication. In particular, an erbium-doped fiber amplifier using, for example, erbium as an amplifying medium has a gain in the 1.55 μm band used for optical communication, and is therefore being actively researched.
【０００３】光ファイバ増幅器の利得は増幅媒質に固有
のパラメータである吸収、放出断面積に依存するので、
吸収、放出断面積の波長依存性に従って光ファイバ増幅
器の利得も波長依存性を有する。Since the gain of an optical fiber amplifier depends on absorption and emission cross sections, which are parameters peculiar to the amplification medium,
The gain of the optical fiber amplifier also has a wavelength dependence according to the wavelength dependence of the absorption and emission cross sections.
【０００４】[0004]
【発明が解決しようとする課題】アナログ通信において
は増幅された光信号が上記の利得の波長依存性と光源の
チャーピングによって歪むという問題がある。光信号の
歪みは小信号利得の波長依存性に依存するので光増幅器
を飽和させても歪みの問題は残る。In analog communication, there is a problem that an amplified optical signal is distorted by the above wavelength dependence of gain and chirping of a light source. Since the distortion of the optical signal depends on the wavelength dependence of the small signal gain, the problem of distortion remains even if the optical amplifier is saturated.
【０００５】本発明の目的は利得の波長依存性が解消さ
れた光増幅装置を実現することにある。An object of the present invention is to realize an optical amplifier device in which the wavelength dependence of gain is eliminated.
【０００６】[0006]
【課題を解決するための手段】本件発明者らは上記問題
を解決すべく研究を重ねた結果、光ファイバ増幅器での
アナログ信号増幅時の波長歪みを解消するためには、光
信号の波長λ0 における利得Ｇの波長依存性ｄＧ／ｄλ
を０にすればよいことを知り得た。本発明はこの知見に
基づいて開発されたものである。As a result of repeated studies to solve the above problems, the present inventors have found that in order to eliminate the wavelength distortion at the time of analog signal amplification in the optical fiber amplifier, the wavelength λ of the optical signal is eliminated. Wavelength dependence of gain G at 0 dG / dλ
I knew that I should set 0 to 0. The present invention was developed based on this finding.
【０００７】即ち、本発明の光増幅装置は、光ファイバ
増幅器を用いた光増幅装置において、異なる増幅媒質を
含んだ二種類以上の光ファイバ増幅器１ａ、１ｂ・・・
をそれらの光ファイバ増幅器１ａ、１ｂ・・・の波長依
存特性が相殺される様に組合わせて直列に接続してなる
ものである。That is, the optical amplifying device of the present invention is an optical amplifying device using an optical fiber amplifier, in which two or more kinds of optical fiber amplifiers 1a, 1b ...
Are connected in series so that the wavelength-dependent characteristics of these optical fiber amplifiers 1a, 1b, ... Are cancelled.
【０００８】[0008]
【作用】本発明の光増幅装置は異なる増幅媒質を含んだ
二種類以上の光ファイバ増幅器１ａ、１ｂ・・・をそれ
らの光ファイバ増幅器１ａ、１ｂ・・・の波長依存特性
が相殺される様に組合わせて直列に接続してなるので、
ｄＧ／ｄλの符号の異なる２種類以上の光ファイバ増幅
器１ａ、１ｂ・・・を適当な比（長さの比）で組み合わ
せることにより、光ファイバ増幅器１ａ、１ｂ・・・全
体として光信号の使用波長λ0 においてｄＧ／ｄλ＝０
とすることができ、光ファイバ増幅器でのアナログ信号
増幅時の波長歪みを解消することができる。In the optical amplifying apparatus of the present invention, two or more kinds of optical fiber amplifiers 1a, 1b ... Containing different amplifying media are used so that the wavelength dependence characteristics of these optical fiber amplifiers 1a, 1b. Since it is connected in series by combining
By combining two or more kinds of optical fiber amplifiers 1a, 1b ... With different signs of dG / d.lamda. at an appropriate ratio (length ratio), the optical fiber amplifiers 1a, 1b. dG / dλ = 0 at the wavelength λ 0
Therefore, the wavelength distortion at the time of analog signal amplification in the optical fiber amplifier can be eliminated.
【０００９】[0009]
【実施例】本発明の光増幅装置を図１の実施例に基づい
て詳細に説明する。図１の光ファイバ増幅器１ａ、１ｂ
は共にエルビウムドープファイバであるが、両者は異な
るホストガラスの組成を有しているため利得の波長依存
性が異なる。夫々の強励起時の利得を図２（ａ）、
（ｂ）に示す。波長１．５５μｍにおいて光ファイバ増
幅器１ａは同図（ａ）に示す様に０．０３ｄＢ／ｍ／ｎ
ｍ、光ファイバ増幅器１ｂは同図（ｂ）に示す様に−
０．０１ｄＢ／ｍ／ｎｍという利得の波長依存性を有す
る。従って、両光ファイバ増幅器１ａ、１ｂの長さを
１：３の比で接続することにより１．５５μｍにおいて
フラットな特性をもたせることができる。図２（ｃ）に
示すものは光ファイバ増幅器１ａを１０ｍと光ファイバ
増幅器１ｂを３０ｍ接続して、強励起したときの利得特
性である。DESCRIPTION OF THE PREFERRED EMBODIMENTS The optical amplifying device of the present invention will be described in detail based on the embodiment of FIG. Optical fiber amplifiers 1a and 1b of FIG.
Are both erbium-doped fibers, but since both have different host glass compositions, the wavelength dependence of gain is different. The respective gains at the time of strong excitation are shown in FIG.
It shows in (b). At the wavelength of 1.55 μm, the optical fiber amplifier 1a is 0.03 dB / m / n as shown in FIG.
m, the optical fiber amplifier 1b is as shown in FIG.
The wavelength dependence of the gain is 0.01 dB / m / nm. Therefore, by connecting the lengths of both the optical fiber amplifiers 1a and 1b at a ratio of 1: 3, it is possible to provide a flat characteristic at 1.55 μm. FIG. 2C shows a gain characteristic when the optical fiber amplifier 1a is connected to 10 m and the optical fiber amplifier 1b is connected to 30 m and strongly pumped.
【００１０】光ファイバ増幅器１ａ、１ｂの接続は融着
が望ましい。ファイバ長、利得の波長依存性は前記した
例に限らず、全体として利得の波長依存性が解消されれ
ばよい。The optical fiber amplifiers 1a and 1b are preferably connected by fusion. The wavelength dependency of the fiber length and the gain is not limited to the above example, and the wavelength dependency of the gain may be eliminated as a whole.
【００１１】図１の２は励起光源３からの励起光、戻り
光等による発振を抑止するための光アイソレータ、４は
光ファイバ増幅器１ｂの出力側に設けられた溶融型光カ
プラである。この溶融型光カプラ４は励起光源からの光
をエルビウムドープファイバに入射するためのものであ
る。Reference numeral 2 in FIG. 1 is an optical isolator for suppressing oscillation due to pumping light, return light, etc. from the pumping light source 3, and 4 is a fusion type optical coupler provided on the output side of the optical fiber amplifier 1b. The fusion type optical coupler 4 is for making the light from the excitation light source enter the erbium-doped fiber.
【００１２】以上の説明は飽和出力で使用する場合にも
適用される。即ち、小信号利得において波長依存性を有
する場合は、飽和出力の波長依存性は見かけ上はフラッ
トであっても増幅された信号は歪むため本発明の適用が
必要である。The above description also applies when used with saturated output. That is, when the small signal gain has wavelength dependency, the saturation output wavelength dependency is apparently flat, but the amplified signal is distorted, so that the present invention needs to be applied.
【００１３】[0013]
【発明の効果】本発明の光増幅装置では伝送される光信
号の波長域における波長依存性がフラットとなって利得
の波長依存性が解消され、歪の無いアナログ伝送を行う
ことができる。According to the optical amplifying device of the present invention, the wavelength dependence of the transmitted optical signal in the wavelength region becomes flat, the wavelength dependence of the gain is eliminated, and analog transmission without distortion can be performed.
【図１】本発明の光増幅装置の一実施例を示す説明図。FIG. 1 is an explanatory diagram showing an embodiment of an optical amplifier of the present invention.
【図２】（ａ）は光ファイバ増幅器の利得の波長依存性
の一例を示す説明図、（ｂ）は本発明の光増幅装置の溶
融型光カプラの波長依存性を示す説明図、（ｃ）は本発
明の光増幅装置の総合利得の波長依存性の説明図。2A is an explanatory diagram showing an example of wavelength dependency of gain of an optical fiber amplifier, FIG. 2B is an explanatory diagram showing wavelength dependency of a fused optical coupler of an optical amplification device of the present invention, FIG. 4) is an explanatory diagram of wavelength dependence of total gain of the optical amplifying device of the present invention.
【符号の説明】 １ａ、１ｂ・・・ 光ファイバ増幅器[Explanation of Codes] 1a, 1b ... Optical fiber amplifier
Claims (1)
おいて、異なる増幅媒質を含んだ二種類以上の光ファイ
バ増幅器１ａ、１ｂ・・・をそれらの光ファイバ増幅器
１ａ、１ｂ・・・の波長依存特性が相殺される様に組合
わせて直列に接続してなることを特徴とする光増幅装
置。1. An optical amplifying device using an optical fiber amplifier, wherein two or more kinds of optical fiber amplifiers 1a, 1b ... Containing different amplification media are wavelength dependent of these optical fiber amplifiers 1a, 1b. An optical amplifying device characterized by being connected in series so as to cancel out the characteristics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10997693A JPH06302921A (en) | 1993-04-13 | 1993-04-13 | Optical amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10997693A JPH06302921A (en) | 1993-04-13 | 1993-04-13 | Optical amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06302921A true JPH06302921A (en) | 1994-10-28 |
Family
ID=14523928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10997693A Pending JPH06302921A (en) | 1993-04-13 | 1993-04-13 | Optical amplifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06302921A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6683713B2 (en) | 1999-08-18 | 2004-01-27 | Fujitsu Limited | Method, device, and system for level equalization |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04147114A (en) * | 1990-10-09 | 1992-05-20 | Nippon Telegr & Teleph Corp <Ntt> | Light level equalizing method |
| JPH04212490A (en) * | 1990-01-27 | 1992-08-04 | Alcatel Nv | Optical fiber amplifier |
| JPH04233519A (en) * | 1990-06-22 | 1992-08-21 | American Teleph & Telegr Co <Att> | Multistage optical fiber amplifier |
| JPH0548178A (en) * | 1991-08-12 | 1993-02-26 | Corning Inc | Fiber amplifier |
-
1993
- 1993-04-13 JP JP10997693A patent/JPH06302921A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04212490A (en) * | 1990-01-27 | 1992-08-04 | Alcatel Nv | Optical fiber amplifier |
| JPH04233519A (en) * | 1990-06-22 | 1992-08-21 | American Teleph & Telegr Co <Att> | Multistage optical fiber amplifier |
| JPH04147114A (en) * | 1990-10-09 | 1992-05-20 | Nippon Telegr & Teleph Corp <Ntt> | Light level equalizing method |
| JPH0548178A (en) * | 1991-08-12 | 1993-02-26 | Corning Inc | Fiber amplifier |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6683713B2 (en) | 1999-08-18 | 2004-01-27 | Fujitsu Limited | Method, device, and system for level equalization |
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