JPH04149525A - Optical fiber amplifier and its exciting method - Google Patents
Optical fiber amplifier and its exciting methodInfo
- Publication number
- JPH04149525A JPH04149525A JP27327590A JP27327590A JPH04149525A JP H04149525 A JPH04149525 A JP H04149525A JP 27327590 A JP27327590 A JP 27327590A JP 27327590 A JP27327590 A JP 27327590A JP H04149525 A JPH04149525 A JP H04149525A
- Authority
- JP
- Japan
- Prior art keywords
- light
- optical fiber
- wavelength
- rare earth
- signal 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.)
- Granted
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims description 7
- 230000005284 excitation Effects 0.000 claims abstract description 28
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 26
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 20
- 239000000835 fiber Substances 0.000 claims abstract description 8
- 230000001902 propagating effect Effects 0.000 claims abstract description 3
- 238000005086 pumping Methods 0.000 claims description 39
- 229910052691 Erbium Inorganic materials 0.000 abstract description 27
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 abstract description 27
- 230000003287 optical effect Effects 0.000 abstract description 20
- 238000006243 chemical reaction Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000000644 propagated effect Effects 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
- H01S2303/00—Pumping wavelength
-
- 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
- H01S3/094011—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre with bidirectional pumping, i.e. with injection of the pump light from both two ends of the 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
- H01S3/09—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
- H01S3/094096—Multi-wavelength pumping
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、光ファイバ増幅器およびその励起方法に関し
、特に、光ファイバ伝送システムにおいて光を増幅する
ために用いられる光ファイバ増幅器および光ファイバ増
幅器の励起方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical fiber amplifier and a pumping method thereof, and in particular to an optical fiber amplifier and an optical fiber amplifier used for amplifying light in an optical fiber transmission system. Concerning excitation methods.
［従来の技術］
従来の光ファイバ増幅器では、光の波長９８０ｎｍ（±
２０ｎｍ２０％あるいはｌ 、 ４８０ｎｍ （±２０
ｎｍ２０％のいずれか一方の光で励起していた。[Prior art] In conventional optical fiber amplifiers, the wavelength of light is 980 nm (±
20nm 20% or l, 480nm (±20
It was excited with either light of 20% nm.
光波長９８０ｎｍｆ±２０ｎｍ以内）の励起光で光ファ
イバを励起する光ファイバ増幅器の第１の従来例を第２
図に示す。The first conventional example of an optical fiber amplifier that pumps an optical fiber with a pumping light having an optical wavelength of 980 nm (within ±20 nm) is described as a second example.
As shown in the figure.
第２図において、波長１，５５０ｎｍｆ±２０ｎｍ以内
）の入力信号光１を信号光入力ボート２より第１の合波
器３を介してエルビウムを添加したエルビウム光ファイ
バ４に入力する。信号光を波長９８０ｎｍ（±２０ｎｍ
２０％の第１の励起光５を第１の合波器３からエルビウ
ム光ファイバ４に入力する。この第１の励起光５は、エ
ルビウム光ファイバ４内では、入力信号光と同じ方向に
伝搬する。エルビウム光ファイバ４で増幅された信号光
を、第２の合波器６を介して信号光出力ポードアに導い
て、波長１，５５０ｎｍｆ±２０ｎｍ以内）の出力信号
光９を出力する。波長９８０ｎｍ Ｉ±２０ｎｍ以内）
の第２の励起光８を第２の合波器６からエルビウム光フ
ァイバ４に入力する。この第２の励起光８は、エルビウ
ム光ファイバ４内では、入力信号光と逆の方向に伝搬す
る。In FIG. 2, an input signal light 1 having a wavelength of 1,550 nmf±20 nm is input from a signal light input boat 2 to an erbium optical fiber 4 doped with erbium via a first multiplexer 3. The signal light has a wavelength of 980 nm (±20 nm
The 20% first pumping light 5 is input from the first multiplexer 3 to the erbium optical fiber 4. This first pumping light 5 propagates within the erbium optical fiber 4 in the same direction as the input signal light. The signal light amplified by the erbium optical fiber 4 is guided to the signal light output port door via the second multiplexer 6, and an output signal light 9 having a wavelength of 1,550 nmf±20 nm is output. Wavelength 980nm I±20nm)
The second excitation light 8 is input from the second multiplexer 6 to the erbium optical fiber 4. This second pumping light 8 propagates in the direction opposite to the input signal light within the erbium optical fiber 4 .
波長９８０ｎｍ （±２０ｎｍ２０％の励起光でエルビ
ウム光ファイバ４を励起すると、光ファイバ増幅器の雑
音特性を示す雑音指数（Ｎｏｉｓｅ Ｆｉｇｕｒｅ、Ｎ
Ｆ）は３ｄＢになり、大変良好であるが、励起光の光パ
ワーが増幅された出力信号光の光パワーに変換される変
換効率は、５０％と余りよくない。When the erbium optical fiber 4 is pumped with pumping light of wavelength 980 nm (±20 nm 20%), the noise figure (Noise Figure, N
F) is 3 dB, which is very good; however, the conversion efficiency for converting the optical power of the pumping light into the optical power of the amplified output signal light is 50%, which is not very good.
９８０ｎｍ （±２０ｎｍ２０％の波長での励起におけ
る雑音指数については、たとえば０ｐｔｉｃａｌ ５ｏ
ｃｉｅｔｙｏｆ Ａｍｅｒｉｃａ主催の国際会議Ｔｏｐ
ｉｃａｌ Ｍｅｅｔｉｎｇ ｏｎＯｐｔｉｃａｌ Ａｍ
ｐｌｉｆｉｅｒｓ（ＵＳＡ、Ｃａ１ｉｆｏｒｎｉａにて
開催）（１９９０年８月６〜８日）における講演番号Ｔ
ｕＢ３゜予稿集１３４〜１３７ページに記載されている
。また、変換効率については、たとえば同じ国際会議の
講演番号ＭＢ３．予稿集１６〜１９ページに記載されて
いる。For noise figure in excitation at wavelength of 980nm (±20nm 20%, e.g. 0ptical 5o
Top international conferences sponsored by society of America
ical Meeting on Optical Am
lecture number T at plifiers (held in California, USA) (August 6-8, 1990)
It is described on pages 134-137 of the uB3° proceedings. Regarding conversion efficiency, for example, lecture number MB3 of the same international conference. It is described on pages 16-19 of the proceedings.
！！！２図示の構成の光ファイバ増幅器において、波長
１，４８０ｎｏ＋（±２０ｎ＋ｍ以内）の励起光５およ
び８でエルビウム光ファイバ４を励起するようにしても
よい。この場合にも波長１．５５Ｏｒ＋ｍｆ±２０ｎｍ
以内）の入力信号光に対して波長１ 、５５０ｎｍ （
±２０ｎｍ２０％の増幅出力信号光が出力ポードアより
得られる。! ! ! In the optical fiber amplifier having the configuration shown in FIG. 2, the erbium optical fiber 4 may be pumped with pumping lights 5 and 8 having a wavelength of 1,480 no+ (within ±20 n+m). In this case too, the wavelength is 1.55Or+mf±20nm
wavelength 1, 550 nm (within
An amplified output signal light of ±20 nm and 20% is obtained from the output port door.
波長１，４８０ｎｍｆ±２０ｎｍ以内）の励起光でエル
ビウム光ファイバ４を励起すると、光ファイバ増幅器の
雑音特性を示す雑音指数は５ないし６ｄＢになり、余り
よくない。ところが、励起光の光パワーが増幅された出
力信号光の光パワーに変換される変換効率は、６０ない
し７０％と大変良好である。When the erbium optical fiber 4 is pumped with pumping light having a wavelength of 1,480 nmf±20 nm), the noise figure indicating the noise characteristics of the optical fiber amplifier becomes 5 to 6 dB, which is not very good. However, the conversion efficiency for converting the optical power of the pumping light into the optical power of the amplified output signal light is very good at 60 to 70%.
１．４８０ｎｍｆ±２０ｎｍ以内）の波長での励起にお
ける雑音指数については、たとえば０ｐｔｉｃａｌ ５
ｏｃｉｅｔｙｏｆ Ａｍｅｒｉｃａ主催の国際会議Ｔｏ
ｐｉｃａｌ Ｍｅｅｔｉｎｇ ｏｎＯｐｔｊｃａｌ Ａ
ｍｐｌｉｆｉｅｒｓ（ＵＳＡ、Ｃａ１ｉｆｏｒｎｉａに
て開催）（１９９０年８月６〜８日）における講演番号
ＭＤ７ 、予稿集６８〜７１ページに記載されている。For the noise figure in excitation at a wavelength of 1.480 nmf ± 20 nm), for example 0ptical
International conference sponsored by the society of America
pical Meeting on Optjcal A
mplifiers (held in California, USA) (August 6-8, 1990), lecture number MD7, and is described in the proceedings, pages 68-71.
また、変換効率については、たとえば同じ国際会議の講
演番号ＴｕＣ３，予稿集１５６〜１５９ページに記載さ
れている。Further, the conversion efficiency is described, for example, in the lecture number TuC3 of the same international conference, pages 156 to 159 of the proceedings.
［発明が解決しようとする課題］
以上に述べた従来の技術による光ファイバ増幅器では、
雑音指数をよ（するために、波長９８０ｎｍ（±２０ｎ
ｍ２０％の励起光を用いると、励起光の光パワーが増幅
された出力信号光の光パワーに変換される変換効率が悪
くなる。他方、励起光の光パワーが増幅された出力信号
光の光パワーに変換される変換効率をよくするために、
波長１．４８０ｎｍ（±２０ｎｍ２０％の励起光を用い
ると、雑音指数が悪（なる。このように、従来の光ファ
イバ増幅器においては、雑音指数がよ（、かつ光パワー
の変換効率のよい光ファイバ増幅器を提供することはで
きなかった。[Problem to be solved by the invention] In the optical fiber amplifier according to the conventional technology described above,
To determine the noise figure, the wavelength is 980 nm (±20 nm).
If pump light of m20% is used, the conversion efficiency in converting the optical power of the pump light into the optical power of the amplified output signal light will deteriorate. On the other hand, in order to improve the conversion efficiency in which the optical power of the pump light is converted to the optical power of the amplified output signal light,
If a pump light with a wavelength of 1.480 nm (±20 nm or 20% is used), the noise figure will be poor.In this way, in conventional optical fiber amplifiers, optical fibers with a good noise figure (and high optical power conversion efficiency) are used. An amplifier could not be provided.
そこで、本発明の目的は、雑音特性を示す雑音指数がよ
く、かつ、励起光の光パワーが増幅された出力信号光の
光パワーに変換される変換効率もよい光ファイバ増幅器
および光ファイバ増幅器の励起方法を提供することにあ
る。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an optical fiber amplifier and an optical fiber amplifier that have a good noise figure indicating noise characteristics and a good conversion efficiency for converting the optical power of pumping light into the optical power of amplified output signal light. The object of the present invention is to provide an excitation method.
［課題を解決するための手段）
このような目的を達成するために、本発明光ファイバ増
幅器は、希土類を添加した希土類光ファイバと、波長９
８０ｎｍ （±２０ｎｍ以内）の第１の励起光を発生す
る第１の励起光源と、前記希土類光ファイバの入力側に
結合され、入力信号光と前記第１の励起光を合波して前
記入力信号光および前記第１の励起光を前記希土類光フ
ァイバ中を同じ方向に伝搬させる第１の合波器と、波長
１．４８０ｎｍ（±２０ｎｒｆ１以内）の第２の励起光
を発生する第２の励起光源と、前記希土類光ファイバの
出力側に結合され、該光ファイバから増幅された出力信
号光を出力すると共に、前記第２の励起光を前記希土類
光ファイバ中を前記入力信号光とは逆の方向に伝搬させ
る第２の合波器とを具えたことを特徴とする。[Means for Solving the Problems] In order to achieve such an object, the optical fiber amplifier of the present invention uses a rare earth optical fiber doped with rare earth elements and a wavelength 9
A first excitation light source that generates a first excitation light of 80 nm (within ±20 nm) is coupled to the input side of the rare earth optical fiber, and combines the input signal light and the first excitation light to generate the input signal. a first multiplexer that propagates the signal light and the first pumping light in the same direction through the rare earth optical fiber; and a second multiplexer that generates the second pumping light with a wavelength of 1.480 nm (within ±20nrf1). A pumping light source is coupled to the output side of the rare earth optical fiber, outputting an amplified output signal light from the optical fiber, and passing the second pumping light through the rare earth optical fiber in a direction opposite to the input signal light. and a second multiplexer for causing propagation in the direction of.
本発明光ファイバ増幅器の励起方法は、希土類を添加し
た希土類光ファイバと、前記希土類光ファイバの入力側
に結合され、入力信号光と第１の励起光を合波して前記
入力信号光および前記第１の励起光を前記希土類光ファ
イバ中を同じ方向に伝搬させる第１の合波器と、前記希
土類光ファイバの出力側に結合され、該光ファイバから
増幅された出力信号光を圧力すると共に、第２の励起光
を前記希土類光ファイバ中を前記入力信号光とは逆方向
に伝搬させる第２の合波器とを有する光ファイバ増幅器
の励起方法において、前記第１の励起光の波長を９８０
ｎｍｆ±２０ｒ＋＋ｎ以内）とし、前記第２の励起光の
波長を１ 、４８０ｎｍ （±２０ｒｖ以内）とするこ
とを特徴とする。A pumping method for an optical fiber amplifier of the present invention includes a rare earth optical fiber doped with a rare earth element, which is coupled to the input side of the rare earth optical fiber, and combines an input signal light and a first pump light to combine the input signal light and the first pump light. a first multiplexer that propagates first pumping light in the same direction through the rare earth optical fiber; and a first multiplexer that is coupled to the output side of the rare earth optical fiber and pressurizes the amplified output signal light from the optical fiber; , a method for pumping an optical fiber amplifier comprising: a second multiplexer that propagates second pump light in the rare earth optical fiber in a direction opposite to that of the input signal light; 980
nmf±20r++n), and the wavelength of the second excitation light is 1.480 nm (within ±20rv).
〔作 用１
本発明では、波長９８０ｎｍ （±２０ｎｍ以内）の励
起光を入力信号光と同じ方向に伝搬させ、かつ、波長１
４８０ｎｍ（±２０ｎｍ以内）の励起光を信号光と逆の
方向に伝搬させてエルビウム光ファイバを励起すること
によって、雑音指数がよく、かつ、励起光の光パワーが
増幅された出力信号光パワーに変換される変換効率のよ
い光ファイバ増幅器を構成できる。[Function 1] In the present invention, excitation light with a wavelength of 980 nm (within ±20 nm) is propagated in the same direction as the input signal light, and the pump light with a wavelength of 1
By pumping an erbium optical fiber by propagating a 480 nm (within ±20 nm) pump light in the opposite direction to the signal light, the output signal light power has a good noise figure and the optical power of the pump light is amplified. An optical fiber amplifier with high conversion efficiency can be constructed.
［実施例］ 以下、図面を参照して、本発明の詳細な説明する。[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.
本発明の一実施例を第１図に示す。An embodiment of the present invention is shown in FIG.
第１図において、波長１．５５０ｎｍ （±２０ｎｍ以
内）の入力信号光２１を信号光入力ボート２２より第１
の合波器２３を介して希土類ファイバとして、エルビウ
ムを添加したエルビウム光ファイバ２４に入力する。第
１の励起光源２５からの波長９８０ｎｍ （±２０ｎｍ
以内）の第１の励起光２６を第１の合波器２３を介して
エルビウム光ファイバ２４に入力する。この第１の励起
光２６は、エルビウム光ファイバ２４内では、入力信号
光と同じ方向に伝搬する。エルビウム光ファイバ２４で
増幅された信号光を、第２の合波器２７を介して信号光
出力ボート２８に導いて、波長１．５５０ｎｍｆ±２０
ｎｍ以内）の出力信号光２９を出力する。第２の励起光
源３０からの波長１．４８０ｎｍ（±２（ｌｎｍ以内）
の第２の励起光３１を第２の合波器２７からエルビウム
光ファイバ２４に入力する。この第２の励起光３１は、
エルビウム光ファイバ２４内では、入力信号光と逆の方
向に伝搬する。In FIG. 1, an input signal light 21 with a wavelength of 1.550 nm (within ±20 nm) is input from a signal light input boat 22 to a first
The signal is input to an erbium optical fiber 24 doped with erbium as a rare earth fiber via a multiplexer 23 . The wavelength from the first excitation light source 25 is 980 nm (±20 nm
The first pumping light 26 (within 200 nm) is input to the erbium optical fiber 24 via the first multiplexer 23 . This first pump light 26 propagates in the same direction as the input signal light within the erbium optical fiber 24 . The signal light amplified by the erbium optical fiber 24 is guided to the signal light output boat 28 via the second multiplexer 27, and the wavelength is 1.550 nm±20.
output signal light 29 (within nm). The wavelength from the second excitation light source 30 is 1.480 nm (±2 (within lnm)
The second excitation light 31 is input from the second multiplexer 27 to the erbium optical fiber 24 . This second excitation light 31 is
Within the erbium optical fiber 24, the input signal light propagates in the opposite direction.
エルビウム光ファイバはある長さがあるが、増幅特性を
決める要因のうち雑音特性については、エルビウム光フ
ァイバの信号光入力ボートに近いところでほとんどが決
まる。そして、励起光の光パワーが増幅された出力信号
光の光パワーに変換される変換効率についてはエルビウ
ム光ファイバの信号光出力ボートに近いところでほとん
どが決まる。Erbium optical fiber has a certain length, but among the factors that determine the amplification characteristics, most of the noise characteristics are determined near the signal light input port of the erbium optical fiber. The conversion efficiency for converting the optical power of the pumping light into the optical power of the amplified output signal light is mostly determined near the signal light output port of the erbium optical fiber.
そこで、本発明では、エルビウム光ファイバ２４の信号
光入力ボート２２に近いところで、波長９８０ｎｍ（±
２０ｎｍ２０％の第１の励起光２６で励起するので、光
ファイバ増幅器の雑音特性を示す雑音指数は３ｄＢにな
り、大変良好となる。それと同時に、エルビウム光ファ
イバ２４の信号光出力ポート２８に近いところで、波長
１，４８０ｎｍ（±２０ｎｍ２０％の第２の励起光３１
で励起するので、励起光の光パワーが増幅された出力信
号光の光パワーに変換される変換効率は、６０ないし７
０％と大変良好となる。Therefore, in the present invention, a wavelength of 980 nm (±
Since the first pumping light 26 of 20 nm and 20% is used for pumping, the noise figure indicating the noise characteristics of the optical fiber amplifier is 3 dB, which is very good. At the same time, a second pumping light 31 with a wavelength of 1,480 nm (±20 nm 20%) is emitted near the signal light output port 28 of the erbium optical fiber 24.
Therefore, the conversion efficiency for converting the optical power of the pumping light into the optical power of the amplified output signal light is between 60 and 7.
0%, which is very good.
［発明の効果］
以上説明したように、本発明によれば、入力ボート側に
おいて波長９８０ｎｍ（±２０ｎｍ２０％の第１の励起
光でエルビウム光ファイバを励起し、かつ出力ボート側
において波長１，４８０ｎｍ（±２０ｎｍ２０％の第２
の励起光でエルビウム光ファイバを励起するので、雑音
特性を示す雑音指数が良く、かつ、励起光の光パワーが
増幅された出力信号光の光パワーに変換される変換効率
の良い光ファイバ増幅を行うことができる。[Effects of the Invention] As explained above, according to the present invention, an erbium optical fiber is excited with the first pumping light having a wavelength of 980 nm (±20 nm 20%) on the input boat side, and a wavelength of 1,480 nm on the output boat side. (±20nm 20% second
Since the erbium optical fiber is pumped with the pumping light of It can be carried out.
第１図は本発明の一実施例を示す構成図、第２図は従来
例を示す構成図である。
１・・・波長１，５５０ｎｍｆ±２０ｎｍ以内）の入力
信号光、
２・・・信号光入力ボート、
３・・・第１の合波器、
４・・・エルビウム光ファイバ、
５・・・波長９８０ｎｍ（±２０ｎｍ２０％の第１の励
起光、
６・・・第２の合波器、
７・・・信号光出力ポート、
８・・・波長９８０ｎｍ（±２０ｎｍ２０％の第２の励
起光、
９・・・増幅された信号光出力、
２１−１．５５０ｎｍ （±２０ｎｍ２０％の人力信号
光、２２・・・信号光入力ボート、
２３・・・第１の合波器、
２４・・・エルビウム光ファイバ、
２２５−９８０ｎ （±２０ｎｍ２０％の第１の励起光
源、２６・・・第１の励起光、
２７・・・第２の合波器、
２８・・・信号光出力ポート、
２９・・・増幅された信号光出力、
３０−・・波長１．４８０ｎｍ（±２０ｎｍ２０％の第
２の励起光源、
３１・・・第２の励起光。FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional example. 1... Input signal light with a wavelength of 1,550 nmf±20 nm), 2... Signal light input port, 3... First multiplexer, 4... Erbium optical fiber, 5... Wavelength 980nm (±20nm 20% first pumping light, 6... Second multiplexer, 7... Signal light output port, 8... Wavelength 980nm (±20nm 20% second pumping light, 9 ... Amplified signal light output, 21-1.550 nm (±20 nm 20% human signal light, 22... Signal light input boat, 23... First multiplexer, 24... Erbium light Fiber, 225-980n (±20 nm 20% first pumping light source, 26... first pumping light, 27... second multiplexer, 28... signal light output port, 29... Amplified signal light output, 30--Second excitation light source with wavelength 1.480 nm (±20 nm 20%), 31-Second excitation light.
Claims (1)
ｎｍ（±２０ｎｍ以内）の第１の励起光を発生する第１
の励起光源と、 前記希土類光ファイバの入力側に結合され、入力信号光
と前記第１の励起光を合波して前記入力信号光および前
記第１の励起光を前記希土類光ファイバ中を同じ方向に
伝搬させる第１の合波器と、 波長１，４８０ｎｍ（±２０ｎｍ以内）の第２の励起光
を発生する第２の励起光源と、 前記希土類光ファイバの出力側に結合され、該光ファイ
バから増幅された出力信号光を出力すると共に、前記第
２の励起光を前記希土類光ファイバ中を前記入力信号光
とは逆の方向に伝搬させる第２の合波器と を具えたことを特徴とする光ファイバ増幅器。 ２）希土類を添加した希土類光ファイバと、前記希土類
光ファイバの入力側に結合され、入力信号光と第１の励
起光を合波して前記入力信号光および前記第１の励起光
を前記希土類光ファイバ中を同じ方向に伝搬させる第１
の合波器と、前記希土類光ファイバの出力側に結合され
、該光ファイバから増幅された出力信号光を出力すると
共に、第２の励起光を前記希土類光ファイバ中を前記入
力信号光とは逆方向に伝搬させる第２の合波器と を有する光ファイバ増幅器の励起方法において、 前記第１の励起光の波長を９８０ｎｍ（±２０ｎｍ以内
）とし、前記第２の励起光の波長を１，４８０ｎｍ（±
２０ｎｍ以内）とすることを特徴とする光ファイバ増幅
器の励起方法。[Claims] 1) A rare earth optical fiber doped with rare earth elements and a wavelength of 980 nm.
nm (within ±20 nm) first excitation light
a pumping light source coupled to the input side of the rare earth optical fiber, which combines the input signal light and the first pumping light so that the input signal light and the first pumping light are routed through the same rare earth optical fiber; a second pump light source that generates a second pump light having a wavelength of 1,480 nm (within ±20 nm); and a second multiplexer that outputs the amplified output signal light from the fiber and propagates the second pumping light in the rare earth optical fiber in a direction opposite to the input signal light. Features of optical fiber amplifier. 2) A rare earth optical fiber doped with a rare earth element is coupled to the input side of the rare earth optical fiber, and the input signal light and the first pump light are combined to combine the input signal light and the first pump light into the rare earth element. The first beam propagates in the same direction through the optical fiber.
a multiplexer, which is coupled to the output side of the rare earth optical fiber, outputs an amplified output signal light from the optical fiber, and transmits a second pumping light into the rare earth optical fiber, which is different from the input signal light. In the pumping method of an optical fiber amplifier having a second multiplexer for propagating in the opposite direction, the wavelength of the first pumping light is 980 nm (within ±20 nm), and the wavelength of the second pumping light is 1, 480nm (±
20 nm or less).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2273275A JP2533682B2 (en) | 1990-10-15 | 1990-10-15 | Optical fiber amplifier and pumping method for optical fiber amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2273275A JP2533682B2 (en) | 1990-10-15 | 1990-10-15 | Optical fiber amplifier and pumping method for optical fiber amplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04149525A true JPH04149525A (en) | 1992-05-22 |
| JP2533682B2 JP2533682B2 (en) | 1996-09-11 |
Family
ID=17525574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2273275A Expired - Lifetime JP2533682B2 (en) | 1990-10-15 | 1990-10-15 | Optical fiber amplifier and pumping method for optical fiber amplifier |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2533682B2 (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04250429A (en) * | 1991-01-28 | 1992-09-07 | Nec Corp | Optical fiber amplifier |
| JPH05121818A (en) * | 1991-04-08 | 1993-05-18 | Alcatel Nv | Optical amplifier using optical fiber, to which erbium is doped |
| JPH05129683A (en) * | 1991-04-08 | 1993-05-25 | General Instr Corp | Optical fiber amplifier having low noise and high output and driving method thereof |
| EP0874427A1 (en) * | 1997-04-23 | 1998-10-28 | Nippon Telegraph And Telephone Corporation | Lasers, optical amplifiers, and amplification methods |
| US5930029A (en) * | 1997-12-02 | 1999-07-27 | Sdl, Inc. | Optical fiber amplifier with optimized power conversion |
| US5995275A (en) * | 1996-02-26 | 1999-11-30 | Fujitsu, Ltd. | Doped fiber amplifier using bidirectional pumping with pump lights having different frequencies |
| US6055092A (en) * | 1995-03-09 | 2000-04-25 | Fujitsu Limited | Multi-wavelength light amplifier |
| US6160659A (en) * | 1995-12-07 | 2000-12-12 | Fujitsu Limited | Method and apparatus for monitoring the momental wavelength of light, and an optical amplifier and an optical communication system which incorporate the method and apparatus to adjust gain tilt |
| US6400499B2 (en) | 1996-05-28 | 2002-06-04 | Fujitsu Limited | Multi-wavelength light amplifier |
| US7924499B2 (en) | 1998-03-19 | 2011-04-12 | Fujitsu Limited | Gain and signal level adjustments of cascaded optical amplifiers |
| CN110048294A (en) * | 2019-03-20 | 2019-07-23 | 广东朗研科技有限公司 | A kind of method of infrared ultrafast pulsed laser in generation high power |
-
1990
- 1990-10-15 JP JP2273275A patent/JP2533682B2/en not_active Expired - Lifetime
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04250429A (en) * | 1991-01-28 | 1992-09-07 | Nec Corp | Optical fiber amplifier |
| JPH05121818A (en) * | 1991-04-08 | 1993-05-18 | Alcatel Nv | Optical amplifier using optical fiber, to which erbium is doped |
| JPH05129683A (en) * | 1991-04-08 | 1993-05-25 | General Instr Corp | Optical fiber amplifier having low noise and high output and driving method thereof |
| US6055092A (en) * | 1995-03-09 | 2000-04-25 | Fujitsu Limited | Multi-wavelength light amplifier |
| US6160659A (en) * | 1995-12-07 | 2000-12-12 | Fujitsu Limited | Method and apparatus for monitoring the momental wavelength of light, and an optical amplifier and an optical communication system which incorporate the method and apparatus to adjust gain tilt |
| US5995275A (en) * | 1996-02-26 | 1999-11-30 | Fujitsu, Ltd. | Doped fiber amplifier using bidirectional pumping with pump lights having different frequencies |
| US6480329B2 (en) | 1996-05-28 | 2002-11-12 | Fujitsu Limited | Multi-wavelength light amplifier |
| US8004752B2 (en) | 1996-05-28 | 2011-08-23 | Fujitsu Limited | Multi-wavelength light amplifier |
| US8699126B2 (en) | 1996-05-28 | 2014-04-15 | Fujitsu Limited | Multi-wavelength light amplifier |
| US6400499B2 (en) | 1996-05-28 | 2002-06-04 | Fujitsu Limited | Multi-wavelength light amplifier |
| US8320040B2 (en) | 1996-05-28 | 2012-11-27 | Fujitsu Limited | Multi-wavelength light amplifier |
| US7474459B2 (en) | 1996-05-28 | 2009-01-06 | Fujitsu Limited | Multi-wavelength light amplifier |
| US7224517B2 (en) | 1996-05-28 | 2007-05-29 | Fujitsu Limited | Multi-wavelength light amplifier |
| KR100353974B1 (en) * | 1997-04-23 | 2002-11-18 | 니뽄 덴신 덴와 가부시키가이샤 | Lasers, optical amplifiers, and amplification methods |
| EP0874427A1 (en) * | 1997-04-23 | 1998-10-28 | Nippon Telegraph And Telephone Corporation | Lasers, optical amplifiers, and amplification methods |
| US6205164B1 (en) | 1997-04-23 | 2001-03-20 | Nippon Telegraph And Telephone Corporation | Lasers, optical amplifiers, and amplification methods |
| US5930029A (en) * | 1997-12-02 | 1999-07-27 | Sdl, Inc. | Optical fiber amplifier with optimized power conversion |
| US7924499B2 (en) | 1998-03-19 | 2011-04-12 | Fujitsu Limited | Gain and signal level adjustments of cascaded optical amplifiers |
| US7969648B2 (en) | 1998-03-19 | 2011-06-28 | Fujitsu Limited | Gain and signal level adjustments of cascaded optical amplifiers |
| US8547629B2 (en) | 1998-03-19 | 2013-10-01 | Fujitsu Limited | Gain and signal level adjustments of cascaded optical amplifiers |
| CN110048294A (en) * | 2019-03-20 | 2019-07-23 | 广东朗研科技有限公司 | A kind of method of infrared ultrafast pulsed laser in generation high power |
| CN110048294B (en) * | 2019-03-20 | 2020-05-08 | 广东朗研科技有限公司 | Method for generating high-power intermediate infrared ultrafast pulse laser |
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|---|---|
| JP2533682B2 (en) | 1996-09-11 |
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