JPH03196125A - Optical amplifying device - Google Patents

Optical amplifying device

Info

Publication number
JPH03196125A
JPH03196125A JP33699089A JP33699089A JPH03196125A JP H03196125 A JPH03196125 A JP H03196125A JP 33699089 A JP33699089 A JP 33699089A JP 33699089 A JP33699089 A JP 33699089A JP H03196125 A JPH03196125 A JP H03196125A
Authority
JP
Japan
Prior art keywords
optical
optical fiber
optical filter
wavelength
fiber amplifier
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
Application number
JP33699089A
Other languages
Japanese (ja)
Other versions
JP2777610B2 (en
Inventor
Yasushi Inoue
恭 井上
Hiroshi Toba
弘 鳥羽
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP33699089A priority Critical patent/JP2777610B2/en
Publication of JPH03196125A publication Critical patent/JPH03196125A/en
Application granted granted Critical
Publication of JP2777610B2 publication Critical patent/JP2777610B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES 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
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06Construction or shape of active medium
    • H01S3/063Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067Fibre lasers
    • H01S3/06754Fibre amplifiers

Abstract

PURPOSE:To smooth the gain characteristic by an optical filter and to enlarge the amplifying band by connecting the optical filter to an optical fiber amplifier consisting of a rare earth element added optical fiber, an excitation light source and an optical system. CONSTITUTION:The device consists of a rare earth element added optical fiber 1, an excitation light source 2, an optical multiplexer 4 for coupling an excitation light and a signal light, and an optical filter 5. The optical filter 5 is used for smoothing a gain characteristic of an optical fiber amplifier and obtaining a wide amplifying area. In such a state, transmission obstructing center wavelength of this optical filter 5 is set so as to coincide with gain peak wavelength of the optical fiber amplifier consisting of the rare earth element optical fiber 1, the excitation light source 2, a signal light source 3 and the optical multiplexer 4. That is, as for the optical filter 5, its transmittivity becomes minimum by some center wavelength, and a transmission characteristic which becomes high transmittivity before and after its wavelength is shown. In such a way, by utilizing the transmission characteristic of the optical filter 5, it can be realized to widen the band of the optical fiber amplifier.

Description

【発明の詳細な説明】 「産業上の利用分野」 本発明は、光通信の分野にて利用されろ増幅帯域の広い
光増幅装置に関するものである。
DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to an optical amplification device with a wide amplification band that is used in the field of optical communications.

「従来の技術」 光信号を直接増幅する光増幅装置としては、様々な種類
のものがあるが、中でら光ファイバを用いた光増幅装置
(以下、光ファイバ増幅器と称する。)は最ら単純てか
っ光伝送ンステムとの整合性に優れている。
"Prior Art" There are various types of optical amplifiers that directly amplify optical signals, but among them, optical amplifiers using optical fibers (hereinafter referred to as optical fiber amplifiers) are the most popular. Excellent compatibility with simple optical transmission systems.

この光ファイバ増幅器は、希土類元素イオン(例えばE
rイオン)が添加された光ファイバと、この光ファイバ
に励起光を入力する手段すなわち励起光源と、励起光と
信号光とを結合する光学系とから概略構成されている。
This optical fiber amplifier uses rare earth element ions (e.g. E
The optical fiber is generally composed of an optical fiber doped with r-ions, a means for inputting excitation light into the optical fiber, that is, an excitation light source, and an optical system for coupling the excitation light and signal light.

希土類元素イオン添加光ファイバに励起光が入力される
と、光ファイバ内の希土類元素イオンが励起され、光フ
ァイバは増幅媒質として#!能する。この状態の希土類
元素添加光ファイバ内へ信号光が入力されると、信号光
は励起された希土類イオンとの誘導放出相互作用によっ
て増幅されて出力される。
When excitation light is input into the rare earth element ion-doped optical fiber, the rare earth element ions in the optical fiber are excited, and the optical fiber acts as an amplification medium. function. When signal light is input into the rare earth element-doped optical fiber in this state, the signal light is amplified by stimulated emission interaction with the excited rare earth ions and is output.

このような光ファイバ増幅器は、増幅媒質が光ファイバ
であるために、光ファイバ伝送システムとの整合性が良
いうえに、増幅利得も20〜35dBと高利得であるこ
とが知られており、光通信においては有用な装置である
Since such optical fiber amplifiers use optical fiber as the amplification medium, they are well compatible with optical fiber transmission systems and are known to have a high amplification gain of 20 to 35 dB. It is a useful device in communications.

「発明が解決しようとする課題」 しかしながら、光ファイバ増幅器には増幅波長帯域か狭
いという欠点がある。
``Problems to be Solved by the Invention'' However, optical fiber amplifiers have the drawback of having a narrow amplification wavelength band.

前記誘導放出は、希土類元素イオンが励起された励起エ
ネルギー準位と、それより低いエネルギー準位とのエネ
ルギー差に対応する波長の光が入力された時に起こる。
The stimulated emission occurs when light of a wavelength corresponding to the energy difference between the excitation energy level at which the rare earth element ion is excited and a lower energy level is input.

したがって増幅可能波長は、希土類元素イオン内のエネ
ルギー準位の状態により規定される。例えば、ノリ力を
母体として■c「イオンが添加された光ファイバの増幅
特性は、第8図に示したようなグラフとなる。
Therefore, the amplifiable wavelength is defined by the state of the energy level within the rare earth element ion. For example, the amplification characteristics of an optical fiber doped with ions using the glue force as a base will be a graph as shown in FIG.

この増幅特性は、本発明前が実験的に得たしのであって
、Erイオンが25ppmの濃度で添加された長さ65
mの光ファイバに、波長148μmの励起光を16dI
3m入力した状態で得られた乙のである。波長1.53
57zmと1.552μm付近に利得ピークが存在して
いる。ピーク(り得値は、それぞれ34.7dB、 2
6.9dL3と高い値が得られているが、3d13帯域
は、波長1.535μm近傍の3’nmの範囲と、波長
1.552μm近傍の4.5nmの範囲となっている。
This amplification characteristic was obtained experimentally before the present invention, and was obtained by adding Er ions at a concentration of 25 ppm.
Pumping light with a wavelength of 148 μm at 16 dI into an optical fiber of
This is the one obtained with 3m input. Wavelength 1.53
Gain peaks exist near 57 zm and 1.552 μm. Peak (obtained value is 34.7 dB, 2
Although a high value of 6.9 dL3 is obtained, the 3d13 band has a range of 3'nm near the wavelength of 1.535 μm and a range of 4.5 nm near the wavelength of 1.552 μm.

この様な増幅特性であると、例えば波長多重(または周
波数多重)された光信号を一括増幅する際に、増幅可能
な多重数が利得帯域により制限されてしまう。したがっ
て、特に波長多重伝送系への適用を考えた場合、光増幅
器としては増幅帯域が広いもの−が望ましいが、光ファ
イバ増幅器はこの点において不十分であった。
With such amplification characteristics, for example, when wavelength-multiplexed (or frequency-multiplexed) optical signals are collectively amplified, the number of multiplexed signals that can be amplified is limited by the gain band. Therefore, especially when considering application to a wavelength division multiplexing transmission system, it is desirable to have an optical amplifier with a wide amplification band, but optical fiber amplifiers are insufficient in this respect.

本発明は前記事情に鑑みてなされたものであって、増幅
帯域の広い光増幅装置を提供することを目的としている
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an optical amplification device with a wide amplification band.

[課題を解決する手段J 本発明の光増幅装置は、希土類元素イオンが添加された
光ファイバと、前記光ファイバに励起光を入力する励起
光源と、励起光と信号光とを結合する光学系とからなる
光ファイバ増幅器であって、該光ファイバの前段と後段
の少なくと6一方に、該光ファイバ増幅器の利得ピーク
波長を平滑化する光フィルタを接続したことを解決手段
とした。
[Means for Solving the Problems J] The optical amplification device of the present invention comprises an optical fiber doped with rare earth element ions, a pump light source that inputs pump light into the optical fiber, and an optical system that couples the pump light and signal light. The solution is to provide an optical fiber amplifier consisting of an optical fiber amplifier, in which an optical filter for smoothing the gain peak wavelength of the optical fiber amplifier is connected to at least six of the front and rear stages of the optical fiber.

「作用」 本発明は、透過阻止中心波長が光ファイバ増幅器の利得
ピーク波長と一致する光フィルタを用いることによって
、光ファイバ増幅器本体の増幅特性を平滑化し、全体と
して帯域の広い光増幅器を実現ケる。
"Operation" The present invention smoothes the amplification characteristics of the optical fiber amplifier main body by using an optical filter whose transmission rejection center wavelength matches the gain peak wavelength of the optical fiber amplifier, thereby realizing an optical amplifier with a wide band as a whole. Ru.

以下、本発明を実施例に沿って詳細に説明する。Hereinafter, the present invention will be explained in detail along with examples.

「実施例j (実施例1) 第1図に本発明の光増幅装置の第一の実施例の構成例と
、この光増幅装置によって増幅される信号光を入力する
信号光源とを合わせて示しl二。この光増幅装置は、布
上MiIS加光ファイバ1と、励起光源2と、励起光と
信号光とを結合する光合波器4と、光フィルタ5とから
なるものである。第1図中、符号3はこの光増幅装置に
よって増幅されろ信号光を出力する信号光源を示す。第
1図に示したこの構成は、従来例で述べた光ファイバ増
幅器に光フィルタ5が従属的に接続された構成である。
Embodiment j (Embodiment 1) FIG. 1 shows a configuration example of the first embodiment of the optical amplification device of the present invention and a signal light source that inputs the signal light to be amplified by this optical amplification device. 12. This optical amplification device consists of a fabric-based MiIS optical fiber 1, a pumping light source 2, an optical multiplexer 4 that couples pumping light and signal light, and an optical filter 5. In the figure, reference numeral 3 indicates a signal light source that outputs signal light that is amplified by this optical amplification device.In this configuration shown in FIG. This is a connected configuration.

光フィルタ5は、光ファイバ増幅器の利得特性を平滑化
して、広い増幅領域を(謬るためのらのである。そして
この光フィルタ5の透;talIfl止中心波長は、希
土類元素光ファイバlと励起光源2と信号光源3と光合
波器4とからなる光ファイバ増幅器の利得ピーク波長と
一致するように設定されている。すなわち光フィルタ5
は、ある中心波長で透過率が最小となり、その波長の前
後では高い透過・率となる透過特性を示すものである。
The optical filter 5 is designed to smooth the gain characteristics of the optical fiber amplifier and widen the amplification range. It is set to match the gain peak wavelength of an optical fiber amplifier consisting of a light source 2, a signal light source 3, and an optical multiplexer 4. In other words, the optical filter 5
indicates a transmission characteristic in which the transmittance is minimum at a certain central wavelength and the transmittance is high around that wavelength.

これを例示すれば、マツハツエンダ光フィルタ、干渉膜
光フィルタ、グレーティング光フィルタ等である。
Examples of this include a Matsuhatsu Enda optical filter, an interference film optical filter, and a grating optical filter.

いま、ここでマツハツエンダ光フィルタを例にとって説
明する。マツハツエンダ光フィルタはたとえば第2図に
示したような構成をしており、2つの光カップラ6a、
6bと、これらをつなぐ各光経路とからなっている。こ
の構造において光カップラ6aの入力端の一端子6a+
から他方の光カップラ6bの出力側の一端子6b3への
透過特性は、次の式で表される。
Now, an explanation will be given using the Matsuhatsu Enda optical filter as an example. The Matsuhatsu Enda optical filter has a configuration as shown in FIG. 2, for example, and includes two optical couplers 6a,
6b, and each optical path connecting these. In this structure, one terminal 6a+ of the input end of the optical coupler 6a
The transmission characteristic from the output terminal 6b3 of the other optical coupler 6b to the output side terminal 6b3 is expressed by the following equation.

から出力側の端子6aいおよび光カップラ6bの入力端
の端子6b、から出力側の端子6b3への透過率を示し
、Rは光カップラ6aの入力側の端子6a。
The transmittance from the terminal 6a on the output side and the terminal 6b on the input side of the optical coupler 6b to the terminal 6b3 on the output side is shown, and R is the terminal 6a on the input side of the optical coupler 6a.

から出力側の端6a3、および光カップラ6bの入力側
の端子6b、から出力側の端子6b3への透過率を示す
。ΔLは2つの光カップラ6a、6bをむすぶ光経路の
光路長差、nは光経路の屈折率、λは光波長である。こ
の式において、T、T1.n、ΔLを定と4′れば、マ
ツハツエンダ光フィルタの透過特性は、光波長に対して
ザインカーブ状の特性を示す。例えば、1え−068、
l’−032、nl、/18、Δ1.. = I 20
71mと4−ると、入力端の端T−6a、から出力側の
端’I−G b3への透過特性は、第3図に示したよう
に計算される。なおこの時、透過中心波長の制御は、マ
ツハツエンダ光フィルタの光経路の屈折率を温度制御な
どの1段で微小に変化さ0“ることにより行うことがで
きる。
The transmittance from the output side end 6a3, the input side terminal 6b of the optical coupler 6b, and the output side terminal 6b3 is shown. ΔL is the optical path length difference between the optical paths connecting the two optical couplers 6a and 6b, n is the refractive index of the optical path, and λ is the optical wavelength. In this formula, T, T1. If n and ΔL are constant 4', the transmission characteristic of the Matsuhatsu Enda optical filter exhibits a sine curve characteristic with respect to the light wavelength. For example, 1e-068,
l'-032, nl, /18, Δ1. .. = I 20
71m and 4-, the transmission characteristics from the input end T-6a to the output end 'I-G b3 are calculated as shown in FIG. At this time, the transmission center wavelength can be controlled by minutely changing the refractive index of the optical path of the Matsuhatsu Enda optical filter to zero in one step such as temperature control.

第3図に示したような光フィルタ5の透過特性を(り用
して、光ファイバ増幅器の広帯域化を実現することがで
きる。
By utilizing the transmission characteristics of the optical filter 5 as shown in FIG. 3, it is possible to realize a broadband optical fiber amplifier.

第1図の実施例に戻る。第1図において、希」ニ類添加
光ファイバ1と、励起光源2と、光合波器4とからなる
光ファイバ増幅器の増幅特性が、例えば第4図(a)に
示した特性であったとする。第4図(a)の特性は、第
8図の特性をそのまま写したものである。これに対し、
マツハツエンダ光フィルタ5の透過特性を第4図(b)
のように設定ずろ。
Returning to the embodiment of FIG. In FIG. 1, assume that the amplification characteristics of the optical fiber amplifier consisting of the rare-doped optical fiber 1, the pumping light source 2, and the optical multiplexer 4 are as shown in FIG. 4(a), for example. . The characteristic shown in FIG. 4(a) is a direct copy of the characteristic shown in FIG. On the other hand,
Figure 4(b) shows the transmission characteristics of Matsuha Tsuender optical filter 5.
Set it like this.

第4図(b)の特性は、第3図の特性をデシベル表示に
直し、さらにその阻止中心波長を先ファイバ増幅器の利
得ピーク波長である1 、5534μmにあイつ仕たも
のである。このようにすると第1図に示した光増幅装置
の波長特性は、光ファイバ増幅器とマツハツエンダ光フ
ィルタ5のそれぞれの特性が重合わさったものとなる。
The characteristics shown in FIG. 4(b) are obtained by converting the characteristics shown in FIG. 3 into decibels and further adjusting the blocking center wavelength to 1,5534 μm, which is the gain peak wavelength of the fiber amplifier. In this way, the wavelength characteristics of the optical amplifying device shown in FIG. 1 will be obtained by superimposing the characteristics of the optical fiber amplifier and the Matsuhatsu Enda optical filter 5.

この特性を示したのが第4図(c)である。第4図(c
)によれば波長1.552μm近傍の3dL3帯域は1
2mmとなっており、ムとの光ファイバ増幅器の3dl
l帯域の45mmに比べて2倍以上に拡がっている。し
たがって本発明の光増幅装置によれば、従来の光ファイ
バ増幅器例に比べて、増幅帯域を広くすることができ、
波長多重信号光の一括増幅にrf利な光増幅器が実現で
きる。
FIG. 4(c) shows this characteristic. Figure 4 (c
), the 3dL3 band near the wavelength 1.552 μm is 1
2mm, 3dl of optical fiber amplifier with mu
This is more than twice as wide as the 45 mm of the L band. Therefore, according to the optical amplification device of the present invention, the amplification band can be made wider compared to conventional optical fiber amplifier examples.
It is possible to realize an optical amplifier that is RF-efficient for batch amplification of wavelength-multiplexed signal light.

なお本実施例では、増幅帯域を拡げた分、光増幅のピー
ク利得値は減少しているが、それでもなお19.8dr
3という値であり、実用性は十分高いといえろ。
In this example, the peak gain value of optical amplification is reduced by expanding the amplification band, but it is still 19.8 dr.
The value is 3, and it can be said that the practicality is sufficiently high.

(実施例2) 実施例1ては3d13帯域は拡がっているが、この帯域
内で2d13程度のT11得の分布が見られる。
(Example 2) In Example 1, the 3d13 band is widened, but a distribution of T11 gain of about 2d13 is observed within this band.

光増幅装置の適用形態によっては、この利得の分布が・
F′滑化された方が望ましい場合がある。本発明第二の
実施例は、」二足実施例1で残された3dL3帯域内の
利得の分布をさらにボ滑化することをfl的とする。
Depending on the application form of the optical amplifier, this gain distribution may vary.
It may be desirable to smooth F'. The second embodiment of the present invention aims to further smooth the gain distribution within the 3dL3 band left in the first embodiment.

第5図に本発明の実施例2の光増幅装置と、この光増幅
装置に信号光を入力する信号光源3との概略構成図を示
した。この実施例2の光増幅装置が実施例1のものと異
なるところは、光ファイノく増幅器の後段に、2段の光
フィルタ51.52を接続したところである。ここで光
フィルタ51゜q9cPねPhマ・ツバツエンダj1−
フィルタとし、これらの透過特性を例えば第6図(a)
 、 (b)のようにそれぞれ設定する。第6図(a)
の特性は、前述のマツハツエンダ光フィルタの透過特性
を表す式%式% μmとした時に得られるしのである。一方、第6図(b
)はi’−0,1I、R−0,89、ΔL = 200
μmとした時に得られろものである。第6図(a)の最
小透過率の中心波長および第6図(b)の最大透過率の
中心波長は共に1.522μmとずろ。
FIG. 5 shows a schematic configuration diagram of an optical amplifying device according to a second embodiment of the present invention and a signal light source 3 that inputs signal light to this optical amplifying device. The optical amplifying device of this second embodiment differs from that of the first embodiment in that two stages of optical filters 51 and 52 are connected after the optical fiber amplifier. Here, the optical filter 51゜q9cPnePhma Tsubatsuenda j1-
For example, the transmission characteristics of these filters are shown in Fig. 6(a).
, (b). Figure 6(a)
The characteristic is obtained when the above-mentioned formula representing the transmission characteristic of the Matsuhatsu Enda optical filter is expressed as % μm. On the other hand, Fig. 6 (b
) is i'-0,1I, R-0,89, ΔL = 200
This is what can be obtained when it is expressed as μm. The center wavelength of the minimum transmittance in FIG. 6(a) and the center wavelength of the maximum transmittance in FIG. 6(b) are both 1.522 μm apart.

この2つのマツハツエンダ光フィルタ51.52を光フ
ァイバ増幅器に接続すると、光増幅装置全体の波長特性
は、2つのマツハツエンダ光フィルタ5I、52および
光ファイバー増幅器の増幅特性を重合わせたものとなる
。例えば、光ファイバ増幅器の増幅特性が第8図に示す
ものであったとすると、光増幅装置全体の波長特性とし
ては、第。
When these two Matsuhatsu Enda optical filters 51 and 52 are connected to an optical fiber amplifier, the wavelength characteristics of the entire optical amplification device become the superposition of the amplification characteristics of the two Matsuhatsu Enda optical filters 5I and 52 and the optical fiber amplifier. For example, if the amplification characteristics of the optical fiber amplifier are as shown in FIG. 8, the wavelength characteristics of the entire optical amplification device are as shown in FIG.

7図に示したような特性が得られる。実施例Iで見られ
た3dB帯域内の利得ピークの分布がより一層平滑化さ
れており、実用上極めて有用な増幅IA 硅 A< +
J?  R1七 飴 1なお前記実施例!および実施例
2の光増幅装置は、いずれも1個または複数個のマツハ
ツエンダ光フィルタ51.52を光ファイバ増幅器の後
段に接続してなるしのであるが、光フィルタ5を光ファ
イバ増幅器のn;1段に接続してら、またその前後に接
続して乙、本発明の光増幅装置では、実施例1および実
施例2と全く同様の効果が1すられる。
Characteristics as shown in Figure 7 are obtained. The distribution of gain peaks within the 3 dB band seen in Example I has been further smoothed, making the amplification IA extremely useful in practice.
J? R17 Candy 1The above example! Both of the optical amplification devices of Example 2 are formed by connecting one or more Matsuhatsu Enda optical filters 51 and 52 to the rear stage of an optical fiber amplifier. In the optical amplifying device of the present invention, by connecting in one stage, or by connecting before and after the same, effects exactly the same as those in the first and second embodiments can be obtained.

よた実施例1む、にび実施例2では、光フィルタ5とし
て、いずれらマツハツエンダ光フィルタを(り用してい
るが、本発明の光増幅装置はこれに■られるしのではな
く、光ファイバ増幅器の利得時P)、を平滑化できるし
のであれば他のフィルタを用いてし良い。
In Embodiment 1 and Embodiment 2, a Matsuhatsu Ender optical filter is used as the optical filter 5, but the optical amplification device of the present invention is not limited to this, but is Other filters may be used as long as they can smooth the fiber amplifier gain P).

「発明の効果」 以」二説明したように、本発明の光増幅装置は、希−に
類元素添加光ファイバと、励起光源と、光学系とからな
る光ファイバ増幅器に、光フィルタを接続してなるもの
であるので、先フィルタによって利得特性を平滑化ずろ
ことができる。よって増幅帯域の広い光増幅装置とする
ことができ、特に波長多重伝送系において非常に有効な
光増幅装置を提供することができる。
``Effects of the Invention'' As explained hereafter, the optical amplifying device of the present invention connects an optical filter to an optical fiber amplifier consisting of a rare element-doped optical fiber, a pumping light source, and an optical system. Therefore, the gain characteristics can be smoothed and shifted by the pre-filter. Therefore, it is possible to provide an optical amplification device with a wide amplification band, and it is possible to provide an optical amplification device that is particularly effective in wavelength division multiplexing transmission systems.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の実施例Iの光増幅装置および信号光源
との概略構成図、 第2図は本発明の光増幅装置に好適に用いられるマツハ
ツエンダ光フィルタの概略構成図、第3図はマツハツエ
ンダ光フィルタの透過特性を示したグラフ、 第4図は(a)は光ファイバ増幅器の増幅特性を示した
グラフ、 第4図(b)はマツハツエンダ光フィルタの透過特性を
示したグラフ、 第4図(c)は第1図に示した光増幅装置の増幅特性を
示したグラフ、 第5図は本発明の実施例2の光増幅装置と信号光源との
概略構成図、 第6図(a)は第5図に示した光増幅装置で用いられろ
1段目のマツハツエンダ光フィルタの透過特性を示した
グラフ、 第6図(b)は2段目のマツハツエンダ光フィルタの透
過特性を示したグラフ、 第7図は本発明の実施例2の光増幅装置の増幅特性を示
したグラフ、 第8図は従来の光ファイバ増幅器の概略構成図である。 1・・希」−類添加光フ 2・・励起光源、 4・光合波器、 5・・・光フィルタ。 ァイバ、 第 図 第 図 第 3 図 波 長 第 図 1545 1.55     1.555 波長(/Jm) 56 第 図(b) 545 55 555 1.56 第 図
FIG. 1 is a schematic configuration diagram of an optical amplification device and a signal light source according to Embodiment I of the present invention, FIG. 2 is a schematic configuration diagram of a Matsuhatsu Enda optical filter suitably used in the optical amplification device of the present invention, and FIG. A graph showing the transmission characteristics of the Matsuhatsu Enda optical filter; FIG. 4 (a) is a graph showing the amplification characteristics of the optical fiber amplifier; FIG. Figure (c) is a graph showing the amplification characteristics of the optical amplifier shown in Figure 1, Figure 5 is a schematic configuration diagram of the optical amplifier and signal light source according to the second embodiment of the present invention, and Figure 6 (a) is a graph showing the amplification characteristics of the optical amplifier shown in Figure 1. ) is a graph showing the transmission characteristics of the first stage Matsuhatsu Enda optical filter used in the optical amplification device shown in Figure 5, and Figure 6 (b) shows the transmission characteristics of the second stage Matsuhatsu Enda optical filter. FIG. 7 is a graph showing the amplification characteristics of the optical amplification device according to the second embodiment of the present invention, and FIG. 8 is a schematic configuration diagram of a conventional optical fiber amplifier. 1. Rare-type doped light 2. Excitation light source, 4. Optical multiplexer, 5. Optical filter. Fiber, Figure Figure 3 Figure Wavelength Figure 1545 1.55 1.555 Wavelength (/Jm) 56 Figure (b) 545 55 555 1.56 Figure

Claims (1)

【特許請求の範囲】 希土類元素イオンが添加された光ファイバと、前記光フ
ァイバに励起光を入力する励起光源と、励起光と信号光
とを結合する光学系とからなる光ファイバ増幅器であっ
て、 該光ファイバの前段と後段の少なくとも一方に、該光フ
ァイバ増幅器の利得ピーク分布を平滑化する光フィルタ
を接続したことを特徴とする光増幅装置。
[Scope of Claims] An optical fiber amplifier comprising an optical fiber doped with rare earth element ions, a pump light source that inputs pump light into the optical fiber, and an optical system that couples the pump light and signal light. . An optical amplification device, characterized in that an optical filter for smoothing a gain peak distribution of the optical fiber amplifier is connected to at least one of the front stage and the rear stage of the optical fiber.
JP33699089A 1989-12-26 1989-12-26 Optical amplifier Expired - Lifetime JP2777610B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP33699089A JP2777610B2 (en) 1989-12-26 1989-12-26 Optical amplifier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP33699089A JP2777610B2 (en) 1989-12-26 1989-12-26 Optical amplifier

Publications (2)

Publication Number Publication Date
JPH03196125A true JPH03196125A (en) 1991-08-27
JP2777610B2 JP2777610B2 (en) 1998-07-23

Family

ID=18304453

Family Applications (1)

Application Number Title Priority Date Filing Date
JP33699089A Expired - Lifetime JP2777610B2 (en) 1989-12-26 1989-12-26 Optical amplifier

Country Status (1)

Country Link
JP (1) JP2777610B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0728105A (en) * 1993-07-14 1995-01-31 Nec Corp Optical fiber amplifier
US5880874A (en) * 1996-04-23 1999-03-09 Nec Corporation Optical equalizer and optical amplifier and wavelength multiple optical transmission apparatus using optical equalizer
EP1170889A2 (en) * 2000-07-06 2002-01-09 KDD Submarine Cable Systems Inc. Optical gain equalizer
US6552845B2 (en) 1998-06-15 2003-04-22 Nec Corporation Optical gain equalizer and optical fiber transmission line

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0728105A (en) * 1993-07-14 1995-01-31 Nec Corp Optical fiber amplifier
JP2751789B2 (en) * 1993-07-14 1998-05-18 日本電気株式会社 Optical fiber amplifier
US5880874A (en) * 1996-04-23 1999-03-09 Nec Corporation Optical equalizer and optical amplifier and wavelength multiple optical transmission apparatus using optical equalizer
US6552845B2 (en) 1998-06-15 2003-04-22 Nec Corporation Optical gain equalizer and optical fiber transmission line
EP1170889A2 (en) * 2000-07-06 2002-01-09 KDD Submarine Cable Systems Inc. Optical gain equalizer
EP1170889A3 (en) * 2000-07-06 2003-04-23 KDD Submarine Cable Systems Inc. Optical gain equalizer

Also Published As

Publication number Publication date
JP2777610B2 (en) 1998-07-23

Similar Documents

Publication Publication Date Title
JP3749392B2 (en) Articles including improved cascaded fiber optic Raman devices
JP2734209B2 (en) Optical fiber amplifier
US5768012A (en) Apparatus and method for the high-power pumping of fiber optic amplifiers
JP2918794B2 (en) Optical amplifier
TW498633B (en) Improved L band amplication using distributed filtering
JPH0685372A (en) Optical device, light-wave transmission and optical amplification method
JP2002049013A (en) Optical filter
JPH06502750A (en) optical network
JPH0864895A (en) Multistage fiber amplifier
JP3092688B2 (en) Optical amplifier and optical amplification method
JPH03196125A (en) Optical amplifying device
JPH0344206A (en) Optical amplifier
JPH0371115A (en) Optical circuit for light amplification
CN106961066A (en) A kind of multi-wavelength random fiber laser of partly beginning to speak based on overlapping fiber grating
KR20030076763A (en) Gain flattening filter and gain flattened optical fiber amplifier using it
JPH07147442A (en) Optical waveguide body amplifier
JP2002506281A (en) Ultra-wideband low noise gain flattened rare earth doped fiber amplifier
CN111600185B (en) Dual-polarization optical fiber amplifier
JP4655553B2 (en) Optical amplifying waveguide, optical amplifying module, and optical communication system
KR100328778B1 (en) The gain flattening filter for Er-doped fiber amplifier
JP2856501B2 (en) Optical fiber amplifier
US6525869B1 (en) Raman amplifier
JPH09138432A (en) Optical amplifier
JP2897076B2 (en) Optical fiber amplifier
JP2870870B2 (en) Optical fiber amplification method and optical fiber amplifier

Legal Events

Date Code Title Description
FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090508

Year of fee payment: 11

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090508

Year of fee payment: 11

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100508

Year of fee payment: 12

EXPY Cancellation because of completion of term
FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100508

Year of fee payment: 12