JPH03269522A - Amplifier device for wavelength multiplex optical transmission line - Google Patents
Amplifier device for wavelength multiplex optical transmission lineInfo
- Publication number
- JPH03269522A JPH03269522A JP2070289A JP7028990A JPH03269522A JP H03269522 A JPH03269522 A JP H03269522A JP 2070289 A JP2070289 A JP 2070289A JP 7028990 A JP7028990 A JP 7028990A JP H03269522 A JPH03269522 A JP H03269522A
- Authority
- JP
- Japan
- Prior art keywords
- optical
- multiplexing
- light
- transmission line
- transmitted
- 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
- 230000003287 optical effect Effects 0.000 title claims abstract description 91
- 230000005540 biological transmission Effects 0.000 title claims abstract description 35
- 230000003321 amplification Effects 0.000 claims abstract description 17
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 17
- 239000013307 optical fiber Substances 0.000 claims description 17
- 230000006854 communication Effects 0.000 abstract description 14
- 238000004891 communication Methods 0.000 abstract description 14
- 239000000835 fiber Substances 0.000 description 13
- 239000004065 semiconductor Substances 0.000 description 13
- 230000002457 bidirectional effect Effects 0.000 description 6
- 229910052691 Erbium Inorganic materials 0.000 description 4
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 4
- 230000007175 bidirectional communication Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 241000270295 Serpentes Species 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Landscapes
- Lasers (AREA)
- Optical Communication System (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、例えば双方向波長多重光通信などに使用さ
れる波長多重光伝送路増幅装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a wavelength division multiplexing optical transmission line amplification device used, for example, in bidirectional wavelength division multiplexing optical communications.
双方向波長多重光通信は、例えば第４図に示すように１
本の光ファイバ（光伝送路）１に波長の異なる光（λ１
．λ、）をそれぞれ対向する方向から入射して双方向に
通信を行うものである。この例では、一方の端局には、
波長λ１の光を送信する光送信器ＴＸ（λ、）２と、波
長λ、の光を受信する光受信器ＲＸ（λ、）３と、波長
λ１の光と波長λ、の光を分波、合波する分波合波素子
４とが設けられており、他方の端局には波長λ。Bidirectional wavelength division multiplexing optical communication is, for example, as shown in Figure 4.
Light of different wavelengths (λ1
．． λ, ) are incident from opposite directions to perform bidirectional communication. In this example, one end station has
An optical transmitter TX(λ,)2 transmits light with wavelength λ1, an optical receiver RX(λ,)3 receives light with wavelength λ, and separates light with wavelength λ1 and light with wavelength λ. , a demultiplexing/multiplexing element 4 for multiplexing are provided, and the other terminal station is provided with a wavelength λ.
の光を送信する光送信器ＴＸ（λ、）５と、波長λ、の
光を受信する光受信器ＲＸ（λ、）６と、同様の分波合
波素子７とが設けられている。一方の端局の光送信器Ｔ
Ｘ（λｌ）ｔからの光（λ、）は分波合波素子４を経て
光ファイバｌを他方の端局に向けて伝送され、他方の端
局の分波合波素子７を経て光受信器ＲＸ（λ、）で受信
される。また逆に他方の端局の光送信器ＴＸ（λ、）５
からの光（λ、）は分波合波素子７を経て先ファイバを
一方の端局に向けて伝送され、一方の端局の分波合波素
子４を経て光受信器ＲＸ（λ、）３で受信され、１本の
光フアイバ１内に２つの波長λλ、の光が逆方向に伝送
されるようになっている。An optical transmitter TX (λ, ) 5 that transmits light of wavelength λ, an optical receiver RX (λ, ) 6 that receives light of wavelength λ, and a similar demultiplexing/multiplexing element 7 are provided. Optical transmitter T of one terminal station
The light (λ,) from X(λl)t passes through the demultiplexing/multiplexing element 4, is transmitted along the optical fiber l toward the other terminal station, and is optically received via the demultiplexing/multiplexing element 7 of the other terminal station. The signal is received by the receiver RX(λ,). Conversely, the optical transmitter TX(λ,)5 of the other terminal station
The light (λ, ) is transmitted through the demultiplexing/multiplexing element 7 to the destination fiber toward one terminal station, and then passes through the demultiplexing/multiplexing element 4 of one terminal station to the optical receiver RX (λ, ). 3, and the lights of two wavelengths λλ are transmitted in opposite directions within one optical fiber 1.
このような双方向波長多重光通信にあっては、通常の光
通信と同様にその伝送距離が増加すると、光ファイバの
伝送損失によって信号レベルが減衰低下する。このため
、長距離伝送には光中継器を設ける必要がある。In such bidirectional wavelength multiplexing optical communication, as in normal optical communication, as the transmission distance increases, the signal level attenuates and decreases due to the transmission loss of the optical fiber. Therefore, it is necessary to provide an optical repeater for long-distance transmission.
一般の光中継器は光信号を一旦電気信号に変換して増幅
し、この電気信号を再び光信号に変換するものである。A general optical repeater first converts an optical signal into an electrical signal, amplifies it, and then converts this electrical signal back into an optical signal.
したがって、このタイプの光中継器を上述の双方向波長
多重光通信に適用した場合、波長の数に対応する数の光
中継器が必要となって装置が高価となるとともに信頼性
においても不安がある。Therefore, when this type of optical repeater is applied to the above-mentioned two-way wavelength division multiplexing optical communication, the number of optical repeaters corresponding to the number of wavelengths is required, making the equipment expensive and causing concerns about reliability. be.
一方、光を直接増幅する光増幅においては、かかる不都
合は解決される。現在光増幅には光半導体を用いた半導
体光増幅器と、エルビウムなとの希土類元素添加ファイ
バを用いたファイバ光増幅器か知られている。On the other hand, in optical amplification in which light is directly amplified, this problem is solved. Currently, two types of optical amplification methods are known: semiconductor optical amplifiers using optical semiconductors and fiber optical amplifiers using fibers doped with rare earth elements such as erbium.
しかし、半導体増幅器もファイバ増幅器もその増幅可能
な波長帯域が狭く、１本の光ファイバに複数の波長の光
が伝送される波長多重通信には、使用することかできな
かった。However, both semiconductor amplifiers and fiber amplifiers have narrow wavelength bands that can be amplified, and cannot be used for wavelength division multiplexing communications in which light of multiple wavelengths is transmitted through a single optical fiber.
よって、この発明の課題は、波長多重光通信のための光
伝送線路において、光増幅による増幅を行えるようにす
ることにある。Therefore, an object of the present invention is to enable amplification by optical amplification in an optical transmission line for wavelength multiplexed optical communication.
Ｃ課題を解決するための手段〕
かかる課題は、複数の波長の光が伝送される主光伝送路
に、２個の合波分波素子を直列に配して、これら合波分
波素子間に波長の数に相当する複数の副伝送路を設け、
これらの副伝送路のそれぞれに上記複数の波長の光をそ
れぞれ１つづつ伝送するようにし、かつこれら副伝送路
にその伝送光を光増幅する光増幅器を設けることで解決
される。Means for Solving Problem C] This problem can be solved by arranging two multiplexing/demultiplexing elements in series on the main optical transmission path through which light of a plurality of wavelengths is transmitted, and connecting the multiplexing/demultiplexing elements between these multiplexing/demultiplexing elements. A plurality of sub-transmission lines corresponding to the number of wavelengths are provided in
This problem can be solved by transmitting one light beam of each of the plurality of wavelengths through each of these sub-transmission lines, and by providing each of these sub-transmission lines with an optical amplifier for optically amplifying the transmitted light.
以下、この発明の詳細な説明する。The present invention will be described in detail below.
第１図は、この発明の波長多重光伝送路増幅装置（以下
、増幅装置と略記する。）の基本的な例を示すものであ
る。FIG. 1 shows a basic example of a wavelength multiplexed optical transmission line amplifier (hereinafter abbreviated as amplifier) of the present invention.
光ファイバからなる主光伝送路１１には波長の異なるｎ
個の光（波長λ１．λ、・ ・・λｎ）が伝送されてい
る。この光伝送路１】には、第１の合波分波素子１２と
第２の合波分波素子１３とか直列に挿入されている。こ
れらの合波分波素子１２゜１３はともに１個の１次ポー
トＰＰと、ｎ個の２次ポートＳＰ、、ＳＰｌ・・・・・
ＳＰｎを有するもので、各素子１２．１３の１次ポー）
ＰＰはそれぞれ主光伝送路１１をなす光ファイバに接続
されている。The main optical transmission line 11 consisting of an optical fiber has n of different wavelengths.
pieces of light (wavelengths λ1.λ, . . . λn) are transmitted. In this optical transmission line 1, a first multiplexing/demultiplexing element 12 and a second multiplexing/demultiplexing element 13 are inserted in series. Both of these multiplexing/demultiplexing elements 12 and 13 have one primary port PP and n secondary ports SP, SPl...
SPn, and the primary port of each element 12.13)
Each of the PPs is connected to an optical fiber forming the main optical transmission line 11.
また、各素子１２．１３の２次ボートｓｐ、、ｓＰ、・
・・・・ＳＰｎはそれぞれ他方の素子１２．１３の同一
番号の２次ボートＳＰ、、ＳＰｌ・・・・ＳＰｎにｎ個
の副伝送路１４．１４・・・・・・をなす０本の光ファ
イバによって接続されている。これにより、各副伝送路
１４．１４・・・・・・には、それぞれ波長の異なる光
が伝送されるようになっており、第１の副伝送路Ｉ４に
は波長λ１の光が、第２の副伝送路１４には波長λ、の
光が、第ｎの副伝送路１４には波長λｎの光が伝送され
るように構成されている。In addition, the secondary ports sp,,sP,・ of each element 12.13
...SPn is the secondary port SP with the same number of the other element 12.13, SPl...SPn with n sub-transmission lines 14.14... connected by optical fiber. As a result, each of the sub-transmission lines 14, 14...... transmits light of a different wavelength, and the first sub-transmission line I4 receives light of wavelength λ1, and the first sub-transmission line I4 receives light of wavelength λ1. The second sub-transmission path 14 is configured to transmit light with a wavelength λ, and the n-th sub-transmission path 14 is configured to transmit light with a wavelength λn.
また、これらの各副伝送路１４．１４・・ には、光増
幅器１５．１５ ・か設けられ、各副伝送路１４．１
４・・・・に伝送される光を増幅するようになっている
。この光増幅器１５は、それか設けられた副伝送路１４
に伝送される光の波長に合致した増幅波長域を有するも
のか遭択され、具体的には増幅波長域が１．３μｍＬｙ
）ＩｎＧａＡｓＰ系半導体光増幅器や、エルビウムなと
の希土類元素添加石英ガラスからなるコアを有する／ン
グルモード光ファイバを使用した増幅波長域が１．５５
μｍのファイバ光増幅器などが用いられる。Further, each of these sub-transmission lines 14.14... is provided with an optical amplifier 15.15.
It is designed to amplify the light transmitted to...4. This optical amplifier 15 is connected to the sub-transmission line 14 provided therein.
The amplification wavelength range that matches the wavelength of the light transmitted to the
) The amplification wavelength range is 1.55 using an InGaAsP semiconductor optical amplifier or a single-mode optical fiber with a core made of quartz glass doped with rare earth elements such as erbium.
A μm fiber optical amplifier or the like is used.
このような増幅装置においては、主光伝送路１１に伝送
されるｎ個の波長の光が一方向に伝送される一方向波長
多重通信であれば、第１の合波分波素子１２が分波器も
しくは合波器として機能し、第２の合波分波素子１３が
合波器もしくは分岐器として機能する。また、ｎ個の波
長の光のうち２以上のいずれかか双方向に伝送される双
方向波長多重通信であれば、第１および第２の合波分波
素子１２．１３はいずれも合波分波器として機能する。In such an amplification device, if it is unidirectional wavelength multiplexing communication in which light of n wavelengths transmitted to the main optical transmission line 11 is transmitted in one direction, the first multiplexing/demultiplexing element 12 performs demultiplexing. It functions as a multiplexer or a multiplexer, and the second multiplexing/demultiplexing element 13 functions as a multiplexer or a splitter. In addition, in the case of bidirectional wavelength multiplexing communication in which two or more of the n wavelengths of light are transmitted bidirectionally, both the first and second multiplexing/demultiplexing elements 12.13 Functions as a splitter.
そして、各副伝送路１４．１４・・に設置される各光増
幅器１５．１５・・・はそれぞれの伝送光の伝送方向に
一致した増幅方向性を有するように構成される。Each of the optical amplifiers 15, 15, . . . installed in each of the sub-transmission lines 14, 14, .
このような増幅装置にあっては、各副伝送路１４．１４
・・に伝送される光の波長に合った増幅波長域の光増幅
器１５．１５・・で各波長の光が増幅されるので、各伝
送光に十分な増幅利得が与えられ、波長多重通信におい
て長距離伝送が可能となる。In such an amplifier, each sub-transmission line 14.14
Since the light of each wavelength is amplified by an optical amplifier with an amplification wavelength range that matches the wavelength of the light transmitted in 15. 15. Long distance transmission becomes possible.
第２図は、この発明の増幅装置の他の例を示すもので、
この例では二つの波長の光としてえよ−１，３μｍ、λ
ｔ”１．５５μｍを使用し、双方向通信するものである
。また、この例での合波分波素子には、シングルモード
型光ファイバを用いた第１および第２の波長多重型光カ
ブラ１６．１７が用いられている。この波長多重型光カ
ブラ１６１７は、第３図に示すような出射特性を有して
おり、ボート■からボート■への光結合はλ１＝１．３
μｍで１００％となり、ボート■からボート■への光結
合はえ、＝１°５５μｍで１００％となっている。よっ
て、λ、＝１．３μｍの光はボート■とボート■との間
で双方向に伝送され、λ、＝１．５５μｍの光はボート
■とボート■との間で双方向に伝送される。FIG. 2 shows another example of the amplifying device of the present invention.
In this example, the two wavelengths of light are −1.3μm and λ
t" 1.55 μm for bidirectional communication. The multiplexing/demultiplexing element in this example includes first and second wavelength multiplexing optical couplers using single mode optical fibers. 16.17 is used. This wavelength multiplexing type optical coupler 1617 has the output characteristics as shown in Fig. 3, and the optical coupling from boat ■ to boat ■ is λ1 = 1.3.
It becomes 100% at μm, and the optical coupling from boat (■) to boat (2) becomes 100% at =1°55 μm. Therefore, light with λ, = 1.3 μm is transmitted bidirectionally between boat ■ and boat ■, and light with λ, = 1.55 μm is transmitted bidirectionally between boat ■ and boat ■. .
また、この例では、１．３μｍ用の副伝送路１４に設け
られた光増幅器１５には、１．３μｍの光を増幅するＩ
ｎＧａＡｓＰ系半導体光増幅器１８が用いられており、
この半導体光増幅器１８の入力側および出力側にはそれ
ぞれ集光用レンズ１９．１９とアイソレータ２０，２０
が設けられている。一方、１．５５μｍ用の副伝送路１
４に設けられた光増幅器には１．５５μｍの光を増幅す
ルエルビウム添加シングルモードファイバを用イた光フ
アイバ型増幅器２１が用いられている。この光フアイバ
型増幅器２１は、コアにエルビウムが添加されたシング
ルモードファイバ２２と、この／ングルモードファイバ
２２の一端に接続された１ ４８μｍ−１，５５μｍｌ
長多重型０ポンプ光入力用カブラ２３と、ポンプ光とな
る波長１４８μｍのレーザ光を発振するレーザ光源２４
とからなるもので、レーザ光源２４からの波長１４８μ
ｍのポンプ光は、ポンプ光入力用カブラ２３のボート■
からボート■に伝送され、ボート■からシングルモード
ファイバ２２にポンプ光として入力される。また、副伝
送路１４を伝送される１、５５μｍの光は、ポンプ光入
力用カブラ２３のボート■からボート■に伝送され、ボ
ート■からシングルモードファイバ２２に信号光として
人力され、ここで光増幅される。Further, in this example, the optical amplifier 15 provided in the sub-transmission line 14 for 1.3 μm has an I/O amplifier for amplifying 1.3 μm light.
An nGaAsP semiconductor optical amplifier 18 is used,
Condensing lenses 19 and 19 and isolators 20 and 20 are provided on the input and output sides of the semiconductor optical amplifier 18, respectively.
is provided. On the other hand, sub-transmission line 1 for 1.55 μm
An optical fiber type amplifier 21 using a luerbium-doped single mode fiber for amplifying 1.55 μm light is used as the optical amplifier provided at 4. This optical fiber type amplifier 21 includes a single mode fiber 22 whose core is doped with erbium, and a 148 μm-1,55 μml single mode fiber 22 connected to one end of the single mode fiber 22.
A long-multiplexed 0 pump light input coupler 23 and a laser light source 24 that oscillates a laser light with a wavelength of 148 μm as pump light.
The wavelength of 148μ from the laser light source 24 is
The pump light of m is the boat of Cobra 23 for pump light input.
The light is transmitted from the boat (2) to the boat (2), and is input as pump light into the single mode fiber 22 from the boat (2). In addition, the 1.55 μm light transmitted through the sub-transmission line 14 is transmitted from the boat ■ of the pump light input coupler 23 to the boat ■, and from the boat ■ it is manually inputted as signal light to the single mode fiber 22, where it is optically transmitted. amplified.
波長１．３μｍの光は、第２図中左側から主光伝送路１
１を伝送され、第１の波長多重型光カブラ１６を経て一
方の副伝送路１４に送られ、半導体光増幅器１８で増幅
されたのち、第２の波長多重型光カブラ１７を経て主光
伝送路１１に戻され右方向に伝送される。また、波長１
．５５μｍの光は第２図中右側から主光伝送路１１を伝
送され、第２の波長多重型光カブラ１７を経て他方の副
伝送路１４に送られ、ポンプ光入力用カブラ２３を経て
エルビウム添加シングルモードファイバ２２に送られ、
ここで光増幅されたのち、第１の波長多重型光カブラ１
６を経て主光伝送路１１に戻され、左方向に伝送される
。Light with a wavelength of 1.3 μm is transmitted through the main optical transmission line 1 from the left side in Figure 2.
1 is transmitted through the first wavelength multiplexing type optical coupler 16, sent to one of the sub transmission lines 14, amplified by the semiconductor optical amplifier 18, and then passing through the second wavelength multiplexing type optical coupler 17 for main optical transmission. The signal is returned to path 11 and transmitted to the right. Also, wavelength 1
．． The 55 μm light is transmitted through the main optical transmission line 11 from the right side in FIG. sent to single mode fiber 22,
After the light is amplified here, the first wavelength multiplexing optical coupler 1
6, the light is returned to the main optical transmission line 11, and transmitted to the left.
この増幅装置では、半導体光増幅器１８および光フアイ
バ型増幅器２１かいずれもその増幅に関しての方向性か
ないため、どの方向から信号光が入力しても反対側に増
幅された信号光が出力される。この特性は、いわゆる０
ＴＤＲ（オプチカルタイム ドメイン リフラクトメト
リー、光パルス試験）を用いて光伝送路の損失状況を測
定する場合にも利用できる。例えば、試験光パルスが第
２図中左方から入射すると試験光は増幅されて右方に出
射する。伝送路中で散乱した光が後方散乱光として右方
から戻ってくると、この後方散乱光は同様に増幅され、
左方へ出力される。この際、試験光パルスの波長が１．
３μｍの場合は、１゜３μｍ用の半導体光増幅器１８を
通過して増幅され、１．５５μｍの場合は１．５５μｍ
用の光フアイバ型光増幅Ｍ２１を通過して増幅される。In this amplifying device, since neither the semiconductor optical amplifier 18 nor the optical fiber type amplifier 21 has any directionality regarding their amplification, no matter which direction the signal light is input from, the amplified signal light is output from the opposite side. This characteristic is called 0
It can also be used to measure the loss status of an optical transmission line using TDR (optical time domain refractometry, optical pulse test). For example, when a test light pulse enters from the left in FIG. 2, the test light is amplified and emitted to the right. When the light scattered in the transmission path returns from the right side as backscattered light, this backscattered light is similarly amplified.
Output to the left. At this time, the wavelength of the test light pulse is 1.
In the case of 3 μm, it is amplified by passing through the semiconductor optical amplifier 18 for 1°3 μm, and in the case of 1.55 μm, it is amplified by the semiconductor optical amplifier 18 for 1°3 μm.
The signal passes through an optical fiber type optical amplifier M21 for amplification.
第２図に示した増幅装置を作成した。主伝送路１１には
径１２５μｍのシングルモード光ファイバを使用し、副
伝送路１４および各先部分間の接続にも同様のシングル
モード光ファイバを使用した。ＩｎＧａＡｓＰ系半導体
光増幅器１８の利得は１２ｄＢで、該光増幅器１８の入
出力端部には反射に伴う増幅度の動作不安定を避けるた
めの無反射コーティングが施しである。エルビウム添加
シングルモードファイバ２２としては、エルビウム添加
量が５００ｐｐｍものを使用し、またポンプ光用のレー
ザ光源２４には１．４８μｍで出力約５０ｍＷの半導体
レーザを使用した。The amplification device shown in FIG. 2 was created. A single-mode optical fiber with a diameter of 125 μm was used for the main transmission line 11, and a similar single-mode optical fiber was used for the sub-transmission line 14 and the connections between the respective end portions. The gain of the InGaAsP semiconductor optical amplifier 18 is 12 dB, and the input and output ends of the optical amplifier 18 are coated with anti-reflection coating to avoid operational instability of the amplification caused by reflection. As the erbium-doped single mode fiber 22, one having an erbium doping amount of 500 ppm was used, and as the laser light source 24 for pump light, a semiconductor laser with a diameter of 1.48 μm and an output of about 50 mW was used.
この増幅装置によって、約３０ｋｍの中継距離で双方向
波長多重通信を行うことができた。This amplifier enabled bidirectional wavelength division multiplexing communication over a relay distance of approximately 30 km.
以上説明したように、この発明の増幅装置は複数の波長
の光が伝送される主光伝送路に、２個の合波分波素子を
直列に配して、これら合波分波素子間に波長の数に相当
する複数の副伝送路を設け、これらの副伝送路のそれぞ
れに上記複数の波長の光をそれぞれ】つつつ伝送するよ
うにし、かつこれら副伝送路にその伝送光を光増幅する
光増幅器を設けたものであるので、波長多重光通信にお
いて設備装置か簡単て、信頼性の高い光増幅を適用する
ことが可能となる。As explained above, the amplifier device of the present invention has two multiplexing/demultiplexing elements arranged in series on the main optical transmission path through which light of a plurality of wavelengths is transmitted, and between these multiplexing/demultiplexing elements. A plurality of sub-transmission lines corresponding to the number of wavelengths are provided, each of these sub-transmission lines transmits light of the plurality of wavelengths, and the transmitted light is optically amplified in these sub-transmission lines. Since the optical amplifier is equipped with an optical amplifier, it is possible to apply highly reliable optical amplification to wavelength division multiplexed optical communications with simple equipment.
第１図および第２図はいずれもこの発明の増幅装置の例
を示す該略構成図、第３図はこの発明の増幅装置に用い
られる合波分波素子としての波長多重型光カブラの出射
特性を示すグラフ、第４図は従来の双方向波長多重光通
信の具体例を示す説明図である。
１１・・・・主光伝送路、１２ ・・・・第１の合波分
波素子、１３・・・第２の合波分波素子、１４・・・・
副伝送器、１５・・・光増幅器、１６・・・・・第１の
波長多重型光カブラ、１７・・・第２の波長多重型光カ
ブラ、１８・・・・・半導体光増幅器、２１イバ型増幅
器。
光ファFigures 1 and 2 are both schematic configuration diagrams showing examples of the amplifier of the present invention, and Figure 3 is the output of a wavelength multiplexing type optical coupler as a multiplexing/demultiplexing element used in the amplifier of the present invention. A graph showing the characteristics, FIG. 4, is an explanatory diagram showing a specific example of conventional bidirectional wavelength multiplexing optical communication. 11... Main optical transmission line, 12... First multiplexing/demultiplexing element, 13... Second multiplexing/demultiplexing element, 14...
Sub-transmitter, 15... Optical amplifier, 16... First wavelength multiplexed optical coupler, 17... Second wavelength multiplexed optical coupler, 18... Semiconductor optical amplifier, 21 Iba type amplifier. optical fiber
Claims (3)
の合波分波素子を直列に配して、これら合波分波素子間
に波長の数に相当する複数の副伝送路を設け、これらの
副伝送路のそれぞれに上記複数の波長の光をそれぞれ１
つづつ伝送するようにし、かつこれら副伝送路にその伝
送光を光増幅する光増幅器を設けたことを特徴とする波
長多重光伝送路増幅装置。(1) Two multiplexing/demultiplexing elements are arranged in series on the main optical transmission line through which light of multiple wavelengths is transmitted, and multiple sub-multiplexing/demultiplexing elements corresponding to the number of wavelengths are arranged between these multiplexing/demultiplexing elements. A transmission line is provided, and one beam of each of the plurality of wavelengths is transmitted to each of these sub-transmission lines.
What is claimed is: 1. A wavelength multiplexing optical transmission line amplifying device, characterized in that the sub-transmission lines are provided with optical amplifiers for optically amplifying the transmitted light.
る請求項（１）記載の波長多重光伝送路増幅装置。(2) The wavelength multiplexing optical transmission line amplifier according to claim 1, wherein the multiplexing/demultiplexing element is a wavelength multiplexing type optical fiber coupler.
１）または（２）記載の波長多重光伝送路増幅装置。(3) Claim (
The wavelength multiplexed optical transmission line amplification device according to 1) or (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2070289A JPH03269522A (en) | 1990-03-20 | 1990-03-20 | Amplifier device for wavelength multiplex optical transmission line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2070289A JPH03269522A (en) | 1990-03-20 | 1990-03-20 | Amplifier device for wavelength multiplex optical transmission line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03269522A true JPH03269522A (en) | 1991-12-02 |
Family
ID=13427175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2070289A Pending JPH03269522A (en) | 1990-03-20 | 1990-03-20 | Amplifier device for wavelength multiplex optical transmission line |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03269522A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06265746A (en) * | 1993-01-14 | 1994-09-22 | Nippon Telegr & Teleph Corp <Ntt> | Bi-directional multi-wavelength transmission equipment |
| EP0617527A1 (en) * | 1993-03-23 | 1994-09-28 | Nortel Networks Corporation | Transmission systems incorporating optical amplifiers |
| EP0621699A1 (en) * | 1993-04-19 | 1994-10-26 | Ascom Tech Ag | Optical transmission system with optical fibre amplifiers |
| JPH07202299A (en) * | 1993-12-28 | 1995-08-04 | Nec Corp | Optical fiber amplifier for wavelength multiplex transmission |
| EP0706270A1 (en) * | 1994-10-05 | 1996-04-10 | Nortel Networks Corporation | Optical amplifiers for wavelength division multiplexed systems |
| US6097534A (en) * | 1996-12-05 | 2000-08-01 | Nec Corporation | Optical amplifier system generating high optical output level |
| US6104848A (en) * | 1997-03-04 | 2000-08-15 | Nec Corporation | WDM optical transmitter |
| US6400498B1 (en) | 1997-05-29 | 2002-06-04 | Nec Corporation | Optical signal repeating and amplifying device and optical level adjusting device |
| US6404525B1 (en) | 1997-07-31 | 2002-06-11 | Nec Corporation | Optical add-drop multiplexer |
| US6587241B1 (en) | 1999-08-20 | 2003-07-01 | Corvis Corporation | Optical protection methods, systems, and apparatuses |
-
1990
- 1990-03-20 JP JP2070289A patent/JPH03269522A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06265746A (en) * | 1993-01-14 | 1994-09-22 | Nippon Telegr & Teleph Corp <Ntt> | Bi-directional multi-wavelength transmission equipment |
| EP0617527A1 (en) * | 1993-03-23 | 1994-09-28 | Nortel Networks Corporation | Transmission systems incorporating optical amplifiers |
| EP0621699A1 (en) * | 1993-04-19 | 1994-10-26 | Ascom Tech Ag | Optical transmission system with optical fibre amplifiers |
| JPH07202299A (en) * | 1993-12-28 | 1995-08-04 | Nec Corp | Optical fiber amplifier for wavelength multiplex transmission |
| US5608571A (en) * | 1994-10-04 | 1997-03-04 | Northern Telecom Limited | Optical amplifiers |
| EP0706270A1 (en) * | 1994-10-05 | 1996-04-10 | Nortel Networks Corporation | Optical amplifiers for wavelength division multiplexed systems |
| US6097534A (en) * | 1996-12-05 | 2000-08-01 | Nec Corporation | Optical amplifier system generating high optical output level |
| US6104848A (en) * | 1997-03-04 | 2000-08-15 | Nec Corporation | WDM optical transmitter |
| US6400498B1 (en) | 1997-05-29 | 2002-06-04 | Nec Corporation | Optical signal repeating and amplifying device and optical level adjusting device |
| US6404525B1 (en) | 1997-07-31 | 2002-06-11 | Nec Corporation | Optical add-drop multiplexer |
| US6895183B2 (en) | 1997-07-31 | 2005-05-17 | Nec Corporation | Optical add-drop multiplexer |
| US6587241B1 (en) | 1999-08-20 | 2003-07-01 | Corvis Corporation | Optical protection methods, systems, and apparatuses |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5995259A (en) | Bidirectional optical telecommunication system comprising a bidirectional optical amplifier | |
| US5280549A (en) | Frequency dependent optical isolator | |
| US5943151A (en) | Mehtod of selectively compensating for the chromatic dispersion of optical signals | |
| US5452124A (en) | Unidirectional amplification for bi-directional transmission using wavelength-division multiplexing | |
| US7035545B2 (en) | Bidirectional multichannel optical telecommunication system | |
| AU699315B2 (en) | Amplified telecommunication system for wavelength-division multiplexing transmissions capable of limiting variations in the output power | |
| US6173094B1 (en) | Optical-transmission system having a split-gain amplifier and a signal-modifying device | |
| US6188509B1 (en) | Simple bidirectional add/drop amplifier module based on a single multiplexer | |
| US20050254819A1 (en) | Optical in-line amplifier and wavelength-division multiplexer | |
| EP1246377B1 (en) | Optical amplifying and relaying system | |
| JPH03269522A (en) | Amplifier device for wavelength multiplex optical transmission line | |
| US6832017B2 (en) | Bidirectional add/drop multiplexer and bidirectional add/drop amplifier module for band-split bidirectional networks | |
| WO1995015625A1 (en) | Bidirectional optical amplifier | |
| JP3591269B2 (en) | Ultra-wideband chromatic dispersion compensation device | |
| JPH07128541A (en) | Optical communication transmitter-receiver and optical amplifier | |
| US6175444B1 (en) | Bi-directional optical amplifier | |
| EP1304775B1 (en) | Dispersion-compensated optical fiber amplifier | |
| JP3468097B2 (en) | Ultra-wideband chromatic dispersion compensation / amplification device | |
| JPS63124633A (en) | Wide band optical communication system especially for subscriber domain | |
| JP4405250B2 (en) | Signal light reflection blocking circuit and optical transmission system | |
| JPH11266205A (en) | Light amplification repeater and monitoring method therefor | |
| JP2002009707A (en) | Optical transmission system and optical transmission method | |
| JPH0311322A (en) | Two-way optical amplifying transmission circuit | |
| RU2172562C2 (en) | Bi-directional optical amplifier and manner of bi-directional communication | |
| JP2001223643A (en) | Optical amplification repeater and its monitoring method |