JPH02219330A - Wavelength multiplexing optical transmission system - Google Patents
Wavelength multiplexing optical transmission systemInfo
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- JPH02219330A JPH02219330A JP1040497A JP4049789A JPH02219330A JP H02219330 A JPH02219330 A JP H02219330A JP 1040497 A JP1040497 A JP 1040497A JP 4049789 A JP4049789 A JP 4049789A JP H02219330 A JPH02219330 A JP H02219330A
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- optical
- wavelength
- transmission system
- light
- demultiplexers
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Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、波長多重光通信に用いる波長多重光伝送シス
テムに関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a wavelength division multiplexing optical transmission system used for wavelength division multiplexing optical communications.
従来の技術
近年、波長多重光伝送システムは高速・大容量な通信が
可能で既存の光フアイバ通信システムを用いての拡張が
容易であるためこの分野での研究開発が進められている
。さらに大容量の通信を行うためには多数の波長を多重
させる技術が必要となってくる。BACKGROUND OF THE INVENTION In recent years, wavelength division multiplexing optical transmission systems are capable of high-speed, large-capacity communication and are easy to expand using existing optical fiber communication systems, so research and development in this field has been progressing. In order to carry out even larger-capacity communications, technology for multiplexing a large number of wavelengths is required.
以下図面を参照しながら上述した波長多重光伝送システ
ムの一例について説明する。An example of the above-mentioned wavelength division multiplexing optical transmission system will be described below with reference to the drawings.
第５図は従来の波長多重光伝送システムの構成を示した
ものである。５１ （１）、 ５１ （２）、・・・
・・・５１ （ｎ）は変調信号源、５２ （１）、
５２ （２）、・・・・・・５２（ｎ）は光源、５３は
光合波器、５４は光分波器、５５ （１）、 ５５
（２）、・・・・・・、５５（ｎ）は光−電気変換器、
５６は光ファイバ、５７は光送信部、５８は光受信部で
ある。FIG. 5 shows the configuration of a conventional wavelength division multiplexing optical transmission system. 51 (1), 51 (2),...
...51 (n) is a modulation signal source, 52 (1),
52 (2), 52 (n) is a light source, 53 is an optical multiplexer, 54 is an optical demultiplexer, 55 (1), 55
(2), ..., 55 (n) is a photo-electrical converter,
56 is an optical fiber, 57 is an optical transmitter, and 58 is an optical receiver.
第６図は第５図での波長多重の概念図である。FIG. 6 is a conceptual diagram of wavelength multiplexing in FIG. 5.
横軸は波長を表し、縦軸はスペクトル強度分布の場合は
強度を、波長選択特性の場合は通過率を表す。６１ （
１）、 ６１ （２）、・・・・・・、６１（ｎ）は
光分波器の波長選択特性、６２ （ＩＬ ６２ （２）
、・・・・・・、６２（ｎ）は多重伝送されている光の
スペクトル強度分布である。The horizontal axis represents the wavelength, the vertical axis represents the intensity in the case of spectral intensity distribution, and the passage rate in the case of wavelength selection characteristics. 61 (
1), 61 (2), ..., 61 (n) are the wavelength selection characteristics of the optical demultiplexer, 62 (IL 62 (2)
, . . . , 62(n) is the spectral intensity distribution of the multiplexed light.
以上のように構成された波長多重光伝送システムについ
て、以下第５図および第６図を用いてその動作を説明す
る。The operation of the wavelength division multiplexing optical transmission system configured as described above will be described below with reference to FIGS. 5 and 6.
光送信部５７においてｎ個の光源５２（１）、５２（２
）、・・・・・・、５２（ｎ）からの互いに異なる波長
λ１λ２．・・・・・・、λｎの光はそれぞれ、変調信
号源５１ （１）、 ５１ （２）、 −、５１（ｎ
）により直接変調される。変調された波長λ１．λ２・
・・・・・、λ７の光は光合波器５３により１本の光フ
ァイバ５６に波長多重されて送信される。送信された光
は光受信部５８において光分波器５４で波長選択特性ｅ
１（ＩＣ６１（２Ｌ ・・・・・・、６１（ｎ）によ
り波長λ１λ２．・・・・・・、λｎにそれぞれ分離さ
れ、各々の光は光−電気変換器５５ （１）、 ５５
（２）、・・・・・・、５５（ｎ）により電気信号に変
えられる。（例えば「光通信素子光学Ｊ ４７５〜４７
６ページ 工学図書）発明が解決しようとする課題
しかしながら上記のような構成では１台の光分波器での
波長分離範囲はλ１〜λｎでこの波長範囲よりも広い領
域で多数の波長を分離することはできず、また１台の光
分波器での波長分離できる数には限界があり、多重数を
増やすことが困難になるという問題点を有していた。In the optical transmitter 57, n light sources 52(1), 52(2)
), ..., 52(n) with mutually different wavelengths λ1λ2 . ......, λn lights are modulated signal sources 51 (1), 51 (2), -, 51 (n
) is directly modulated by Modulated wavelength λ1. λ2・
..., the light of λ7 is wavelength-multiplexed into one optical fiber 56 by the optical multiplexer 53 and transmitted. The transmitted light is subjected to a wavelength selection characteristic e by an optical demultiplexer 54 in an optical receiver 58.
1 (IC 61 (2L..., 61(n)) separates the light into wavelengths λ1, λ2, .
(2), . . . , 55(n) converts it into an electrical signal. (For example, “Optical Communication Element Optics J 475-47
Page 6 Engineering Book) Problems to be Solved by the Invention However, in the above configuration, the wavelength separation range of one optical demultiplexer is λ1 to λn, and many wavelengths are separated in an area wider than this wavelength range. In addition, there is a limit to the number of wavelengths that can be separated by one optical demultiplexer, making it difficult to increase the number of wavelengths to be multiplexed.
本発明は上記問題点に鑑み、広い波長範囲で多重数の多
い波長多重光伝送システムを提供するものである。In view of the above problems, the present invention provides a wavelength division multiplexing optical transmission system that has a wide wavelength range and a large number of multiplexed wavelengths.
課題を解決するだめの手段
上記課題を解決するために本発明の波長多重光伝送シス
テムは複数の波長の異なる光源と波長多重させるための
光結合器とを具備する光送信部と、光分岐器といくつか
の光分波器と複数の光−電気変換器を具備する光受信部
からなり、前記いくつかの光分波器は互いに重ならない
波長選択特性を有し、かつ、それぞれの光分波器は波長
分離領域を共有しないような構成をとるものである。Means for Solving the Problems In order to solve the above problems, the wavelength division multiplexing optical transmission system of the present invention includes an optical transmitter including a plurality of light sources with different wavelengths and an optical coupler for wavelength multiplexing, and an optical branching unit. , several optical demultiplexers, and a plurality of optical-to-electrical converters, each of which has wavelength selection characteristics that do not overlap with each other, and has wavelength selection characteristics that do not overlap with each other. The wave transmitter is configured so that the wavelength separation region is not shared.
また、光送信部において、いくつかの光合波器で合波し
た後、光結合器により光結合するような構成をとること
もできる。Further, in the optical transmission section, a configuration may be adopted in which multiplexing is performed using several optical multiplexers, and then optical coupling is performed using an optical coupler.
光合波器、あるいは光分波器には回折格子を波長分離素
子として用いることが望ましい。It is desirable to use a diffraction grating as a wavelength separation element in an optical multiplexer or an optical demultiplexer.
また、光結合器並びに光分岐器を光カプラにすることも
でき、さらに光カブラで光結合器および光分岐器を一体
化することもできる。Further, the optical coupler and the optical branching device can be an optical coupler, and furthermore, the optical coupler and the optical branching device can be integrated with an optical coupler.
作用
本発明は上記した構成によって、波長多重伝送する波長
領域を拡大し、多重数を増大させることができる。Effect of the Invention With the above-described configuration, the present invention can expand the wavelength range for wavelength multiplexed transmission and increase the number of wavelengths to be multiplexed.
また、光合波器を回折格子を波長分散素子として用いる
ことにより低りし１ス１−−りなシステムを構築するこ
とができる。Further, by using an optical multiplexer and a diffraction grating as a wavelength dispersion element, a low-resolution system can be constructed.
実施例
以下本発明の第１の一実施例の波長多重光伝送システム
について、図面を参照しながら説明する。Embodiment Hereinafter, a wavelength division multiplexing optical transmission system according to a first embodiment of the present invention will be described with reference to the drawings.
第１図は本発明筒１の実施例の波長多重光伝送システム
の構成図を示すものである。第１図において、１０（１
）〜１０（ｎ）、１０（ｎ＋１）〜１０（ｎ十ｍ）、１
０（ｎ＋ｍ＋１）〜１０（ｎ＋ｍ＋ｐ）は（ｎ＋ｍ＋ｐ
）個の変調信号源、１１（１）〜１１（ｎ）、１１ （
ｎ＋１）〜１１ （ｎ＋ｍ） 、 １１（ｎ＋ｍ＋１
）〜１１ （ｎ十ｍ＋ｐ）は（ｎ＋ｍ＋ｐ）個の光源、
１２は光結合器、１３は光分岐器、１４ａ、１４ｂ、１
４ｃは光分波器、１５（１）〜１５（ｎ）、 １５
（ｎ＋１）〜１５ （ｎ＋ｍ） 、 １５（ｎ＋ｍ＋
１）〜１５（ｎ＋ｍ＋Ｐ）は（ｎ＋ｍ＋ｐ）個の光−電
気変換器、１６は光ファイバ、１７は光送信部、１８は
光受信部である。FIG. 1 shows a configuration diagram of a wavelength division multiplexing optical transmission system according to an embodiment of the present invention tube 1. As shown in FIG. In Figure 1, 10(1
)~10(n), 10(n+1)~10(n0m), 1
0(n+m+1) to 10(n+m+p) is (n+m+p
) modulation signal sources, 11(1) to 11(n), 11(
n+1) ~ 11 (n+m), 11(n+m+1
)~11 (n0m+p) is (n+m+p) light sources,
12 is an optical coupler, 13 is an optical splitter, 14a, 14b, 1
4c is an optical demultiplexer, 15(1) to 15(n), 15
(n+1) ~ 15 (n+m), 15(n+m+
1) to 15(n+m+P) are (n+m+p) optical-to-electrical converters, 16 is an optical fiber, 17 is an optical transmitter, and 18 is an optical receiver.
第２図は第１図における波長多重の概念図である。第２
図において横軸は波長、縦軸はスペクトル強度分布に対
しては強度を表し、波長分離特性に対しては通過率を表
している。２１（１）〜２１（ｎ）はｎ個の光分波器１
４ａの波長分離特性、２１（ｎ ＋ １） 〜２１ （
ｎ ＋ｍ）は光分波器１４ｂの波長分離特性、２１ （
ｎ 十ｍ＋１）〜２１（ｎ十ｍ＋ｐ）光分波器１４ｃの
波長分離特性、２２（１）〜２１（ｎ＋ｎ＋ｐ）は（ｎ
十ｍ＋ｐ）波多重した光のスペクトル強度分布である。FIG. 2 is a conceptual diagram of wavelength multiplexing in FIG. 1. Second
In the figure, the horizontal axis represents wavelength, the vertical axis represents intensity for spectral intensity distribution, and passage rate for wavelength separation characteristics. 21(1) to 21(n) are n optical demultiplexers 1
Wavelength separation characteristics of 4a, 21(n + 1) ~ 21 (
n + m) is the wavelength separation characteristic of the optical demultiplexer 14b, 21 (
The wavelength separation characteristics of the optical demultiplexer 14c, 22(1) to 21(n+n+p) are (n
10m+p) is the spectral intensity distribution of wave-multiplexed light.
以上のように構成された波長多重光通信システムについ
て、以下第１図、第２図を用いてその動作を説明する。The operation of the wavelength division multiplexing optical communication system configured as described above will be explained below with reference to FIGS. 1 and 2.
光送信部１７において変調信号源１０（１）〜１０（ｎ
＋ｍ＋ｐ）、で直接変調された光源１１（１）〜１１（
ｎｆｍ十ｐ）からの互いに異なる波長λ１〜λ。。In the optical transmitter 17, modulated signal sources 10(1) to 10(n
+m+p), the light sources 11(1) to 11(
mutually different wavelengths λ1 to λ from nfm1p). .
λ７゜１〜λ。ヤ、、λ７−１〜λ７−１２の光はそれ
ぞれスペクトル強度分布２２（１）〜２２ （ｎ＋ｍ＋
ｐ）を有しており、この光は光結合器１２により（ｎ、
＋ ｍ ＋ｐ ）波多重され、１本の光ファイバ１６
により伝送される。伝送された光は光受信部１日におい
て光分岐器１３により３分割される。λ7゜1~λ. The lights of λ7-1 to λ7-12 have spectral intensity distributions of 22(1) to 22 (n+m+
p), and this light is transmitted by the optical coupler 12 to (n,
+m +p) waves are multiplexed into one optical fiber 16
Transmitted by The transmitted light is divided into three parts by an optical splitter 13 in one day at the optical receiver.
分割された光はそれぞれ光分波器１４ａ、１４ｂ。The split lights are sent to optical demultiplexers 14a and 14b, respectively.
１４ｃに入力される。波長多重されている光の波長は、
光分波器１４ａでは波長分離特性２１（１）〜２１（ｎ
）により波長λ１〜λ１．の光にそれぞれ分離される。14c. The wavelength of the wavelength-multiplexed light is
The optical demultiplexer 14a has wavelength separation characteristics 21(1) to 21(n
), the wavelengths λ1 to λ1. The light is separated into two parts.
光分波器１４ｂでは波長分離特性２１（ｎ＋１）〜２１
（ｎ十ｍ）により波長λｎ＋１〜λ７１．の光にそれぞ
れ分離される。光分波器１４Ｃでは波長分離特性２１（
ｎ＋ｍ＋１）〜２１（ｎ十ｍ＋ｐ）により波長λ７４□
。、〜λ７゜ｍａｐの光にそれぞれ分離される。分離さ
れた光は光−電気変換器１５（１）〜１５ （ｎ十ｍ＋
ｐ）により電気信号に変換され取り出される。The optical demultiplexer 14b has wavelength separation characteristics 21(n+1) to 21
(n0m), the wavelength λn+1 to λ71. The light is separated into two parts. In the optical demultiplexer 14C, the wavelength separation characteristic 21 (
Wavelength λ74□ by n+m+1)~21(n0m+p)
. , ~λ7°map. The separated light is transmitted through optical-to-electrical converters 15(1) to 15 (n0m+
p) is converted into an electrical signal and extracted.
以上のように本実施例によれば、分離する波長領域が異
なり、それぞれの分離特性は互いに重ならないような複
数の光分波器を光結合器で結合させることにより、簡単
な構成で波長多重させる波長領域を広くすることができ
る。As described above, according to this embodiment, by combining a plurality of optical demultiplexers with different wavelength regions and whose separation characteristics do not overlap with each other using an optical coupler, wavelength multiplexing can be performed with a simple configuration. It is possible to widen the wavelength range.
第３図は本発明筒２の実施例の波長多重光伝送システム
の構成図を示すものである。第３図において、３０（１
）〜３０（ｎ）、３０ （ｎ＋１）〜３０（ｎ十ｍ）
３０（ｎ４−ｍ＋１）〜３０（ｎ十ｍ十ｐ）は（ｎ＋
ｍ＋ｐ）個の変調信号源、３１（１）〜３１（ｎ）
３１（ｎ＋１）〜１１ （ｎ＋ｍ）、３１（ｎ＋ｍ＋１
）〜３１（ｎ＋ｍ＋ｐ）は（ｎ＋ｍ＋ｐ）個の光源、３
９ａ、３９ｂ、３９ｃは光合波器、３２は光結合器、３
３は光分岐器ね４４ａ、４４ｂ４４Ｃは光分波器、４５
（１）〜４５ （ｎ）、 ４５（ｎ＋１）〜４５ （
ｎ十ｍ）、４５（ｎ→−ｍ＋１）〜４５ （ｎ＋ｍ＋ｐ
）は（ｎ十ｍ十Ｐ）個の光電気変換器、４６は光ファイ
バ、４７は光送信部、４８は光受信部である。FIG. 3 shows a configuration diagram of a wavelength division multiplexing optical transmission system according to an embodiment of the tube 2 of the present invention. In Figure 3, 30(1
) ~ 30 (n), 30 (n + 1) ~ 30 (n 10 m)
30(n4-m+1) to 30(n0m0p) is (n+
m+p) modulation signal sources, 31(1) to 31(n)
31(n+1) to 11(n+m), 31(n+m+1
)~31(n+m+p) is (n+m+p) light sources, 3
9a, 39b, 39c are optical multiplexers, 32 is an optical coupler, 3
3 is an optical branching device 44a, 44b, 44C is an optical branching device, 45
(1) ~ 45 (n), 45 (n+1) ~ 45 (
n0m), 45 (n→-m+1) to 45 (n+m+p
) are (n0m0P) photoelectric converters, 46 is an optical fiber, 47 is an optical transmitter, and 48 is an optical receiver.
第４図は第３図における波長多重の概念図である。第４
図において横軸は波長、縦軸はスペクトル強度分布に対
しては強度を表し、波長分離特性に対しては通過率を表
している。４１（Ｉ）〜４１（ｎ）はｎ個の光合波器３
９ａ、光分波器３４ａの波長分離特性、４１（ｎ＋１）
〜４１（ｎ十ｍ）はｍ個の光合波器３９ｂ、光分波器３
４ｂの波長分離特性、４１ （ｎ ＋ｍ＋１）〜４１（
ｎ＋ｍ＋ｐ）はｐ個の光合波器３９Ｃ２光分波器３４ｃ
の波長分離特性、４２（１）〜４１ （ｎ＋ｎ＋ｐ）は
（ｎ＋ｍ＋ｐ）波ｆ４した光のスペクトル強度分布であ
る。FIG. 4 is a conceptual diagram of wavelength multiplexing in FIG. 3. Fourth
In the figure, the horizontal axis represents wavelength, the vertical axis represents intensity for spectral intensity distribution, and passage rate for wavelength separation characteristics. 41(I) to 41(n) are n optical multiplexers 3
9a, wavelength separation characteristics of optical demultiplexer 34a, 41(n+1)
~41 (n0m) are m optical multiplexers 39b and optical demultiplexers 3
Wavelength separation characteristics of 4b, 41 (n + m+1) to 41 (
n+m+p) is p optical multiplexers 39C2 optical demultiplexers 34c
The wavelength separation characteristics, 42(1) to 41 (n+n+p) are the spectral intensity distributions of the (n+m+p) waves of light f4.
以上のように構成された波長多重光通信システムについ
て、以下第３図、第４図を用いてその動作を説明する。The operation of the wavelength division multiplexing optical communication system configured as described above will be explained below with reference to FIGS. 3 and 4.
光送信部３７において変調信号源３０（１）〜３０（ｎ
＋ｍ＋ｐ）で直接変調された光源３１（１）〜３１（１
４ｍ−１−ｐ）からの互いに異なる波長λ１〜λ。In the optical transmitter 37, modulated signal sources 30(1) to 30(n
+m+p) directly modulated light sources 31(1) to 31(1
4m-1-p) at mutually different wavelengths λ1 to λ.
λ、、＋ｌ〜λ７□、λ、、。、。１〜λ７゜、９の光
はそれぞれ光合波器３９ａ、３９ｂ、３９ｃにより、合
波時１生４１（１１〜４１（ｎ）、 ４１ （ｎ＋１）
〜４１（１４ｍ） ４１（ｎ＋ｍ＋１）〜４１（ｎ＋
ｍ＋ｐ）により波長フィルターをかけながら合波させ、
まずスペクトル強度分布４２（１）〜４２（ｎ）、４２
（ｎ＋１）〜４２ （１４ｍ）、４２（ｎ＋ｍ＋１）〜
４２（ｎ＋ｍ＋ｐ）の３つの波長領域に合波される。こ
の光は光結合器３２により（ｎ十ｍ＋ｐ）波多重され、
１本の光ファイバ３６により伝送される。伝送された光
は光受信部３８において光分岐器３３により３分割され
る。分割された光はそれぞれ光分波器３４ａ、３４ｂ、
３４ｃに入力される。波長多重されている光の波長は、
光分波器３４ａでは波長分離特性４１（１１〜４１（ｎ
）により波長７１〜λ、の光にそれぞれ分離される。光
分波器４４ｔ＋では波長分離特性４１ （ｎ＋１）〜４
１（１４ｍ）により波長λ、、４．〜λ７４．の光にそ
れぞれ分離される。光分波器４４ｃでは波長分離特性４
１（ｎ＋ｍ＋１）〜４１ （１４ｍ−１−ｐ）により波
長λｌｌ＋ｆｆｌ＋ｌ〜λｎ、ｎ。２の光にそれぞれ分
離される。分離された光は光−電気変換器４５（１）〜
４５ （ｎ＋ｍ＋ｐ）により電気信号に変換され取り出
される。λ,,+l~λ7□,λ,,. ,. When the lights of 1 to λ7° and 9 are multiplexed by optical multiplexers 39a, 39b, and 39c, respectively, they are combined into one wave 41 (11 to 41 (n), 41 (n+1)).
〜41(14m) 41(n+m+1)〜41(n+
m+p) while applying a wavelength filter,
First, spectral intensity distributions 42(1) to 42(n), 42
(n+1)~42 (14m), 42(n+m+1)~
42 (n+m+p) wavelength ranges. This light is multiplexed by (n0m+p) waves by the optical coupler 32,
It is transmitted through one optical fiber 36. The transmitted light is divided into three parts by the optical splitter 33 in the optical receiver 38 . The split lights are each passed through optical demultiplexers 34a, 34b,
34c. The wavelength of the wavelength-multiplexed light is
The optical demultiplexer 34a has wavelength separation characteristics 41 (11 to 41(n
), the light is separated into light with wavelengths 71 to λ. The optical demultiplexer 44t+ has wavelength separation characteristics 41 (n+1) to 4
1 (14 m), the wavelength λ, , 4. ~λ74. The light is separated into two parts. The optical demultiplexer 44c has wavelength separation characteristics 4
1(n+m+1) to 41 (14m-1-p), the wavelength λll+ffl+l to λn,n. It is separated into two light beams. The separated light is transmitted through optical-to-electrical converters 45(1) to
45 (n+m+p) and is converted into an electrical signal and taken out.
以上のように本発明によれば、合波する波長領域が異な
り合波特性が互いに重ならないような複数の光合波器を
光結合器で結合させることにより、光送信部側でそれぞ
れの光源に波長フィルターをかけてクロストークを小さ
（して波長多重伝送させ、光受信部で分離する波長領域
が異なり波長分離特性が互いに重ならないような複数の
光分波器を光分岐器に接続したもので波長分離すること
により、クロストークのさらに低いシステムを構築でき
、例えば光源が半導体レーザの場合、レーザの持つサイ
ドモードを光送信部である程度抑圧できるようにするこ
とができ、光源の波長揺らぎに対しても強いシステムと
なる。As described above, according to the present invention, by combining a plurality of optical multiplexers with different wavelength ranges to be multiplexed and whose multiplexing characteristics do not overlap with each other using an optical coupler, each light source is connected to the optical transmitter side. A wavelength filter is applied to reduce crosstalk (to reduce crosstalk) and wavelength multiplex transmission is performed, and multiple optical demultiplexers are connected to an optical splitter so that the wavelength ranges to be separated at the optical receiver are different and the wavelength separation characteristics do not overlap with each other. By separating the wavelengths using a device, it is possible to construct a system with even lower crosstalk. For example, if the light source is a semiconductor laser, the side mode of the laser can be suppressed to some extent in the optical transmitter, and the wavelength fluctuation of the light source can be suppressed to some extent. It is also a strong system.
また、この実施例において光合波器および光分波器に急
峻な波長選択性のある回折格子を使用すれば、クロスト
ークの低いシステムとすることが容易にできるうえに、
波長選択特性の中心波長を可変することが原理上容易で
あるため、本発明のシステムを構築しやすいという利点
を有している。Furthermore, in this embodiment, if a diffraction grating with steep wavelength selectivity is used in the optical multiplexer and optical demultiplexer, it is possible to easily create a system with low crosstalk.
Since it is easy in principle to vary the center wavelength of the wavelength selection characteristic, the system of the present invention has the advantage of being easy to construct.
発明の効果
以上のように本発明は複数の波長の異なる光源と波長多
重させるための光結合器とを具備する光送信部と、光分
岐器とい（つかの光分波器と複数の光−電気変換器を具
備する光受信部からなり、光分波器は互いに重ならない
波長選択特性を有し、かつ、それぞれの光分波器は波長
分離領域を共有しないことにより、簡単な構成で広い波
長範囲にわたり多重数が多い波長多重光伝送ができる。Effects of the Invention As described above, the present invention provides an optical transmitter including a plurality of light sources with different wavelengths and an optical coupler for wavelength multiplexing, an optical splitter (some optical demultiplexers, and a plurality of optical couplers). It consists of an optical receiver equipped with an electrical converter, and the optical demultiplexers have wavelength selection characteristics that do not overlap with each other, and each optical demultiplexer does not share a wavelength separation area, so it has a simple configuration and a wide range. Wavelength multiplexing optical transmission with a large number of multiplexes over a wavelength range is possible.
第１図は本発明の第１の実施例における波長多重光伝送
システムの構成図、第２図は第１図の実施例におけるシ
ステム概念図、第３図は本発明の第２の実施例におＬＪ
る波長多重光伝送システムの構成図、第４図は第３図の
実施例におけるシステムの概念図、第５図は従来の波長
多重光伝送システムの構成図、第６図は従来の波長多重
光伝送の概念図である。
１０（１３〜１０ （ｎ＋ｍ＋ｐ）−−変調信号源、１
１ （１）〜１１ （ｎ ＋ｍ＋ ｐ ）−・＝光源、
１２−−−−−−光結合器、１３・・・・・・光分岐器
、１４ａ、１４ｂ１４ ｃ−・・・−・光分波器、１５
ｍ〜１５（ｎ＋ｍ＋ｐ）・・・・・・光−電気変革器、
１６・・・・・・光ファイバ、１７・・・・・・光発信
部、１８・・・・・・光受信部、２１０）〜２１（ｎ）
・・・・・・光分波器１４ａの波長分離特性、２１（ｎ
＋１）〜２１（１４ｍ）・・・・・・光分波器１４ｂの
波長分離特性、２１（ｎ十ｍ＋１）２１（ｎ＋ｍ＋ｐ）
・・・・・・光分波器１４ｃの波長分離特性、２２（１
）〜２２ （ｎ＋ｍ＋ｐ）・・・・・・波長多重された
光のスペクトル。FIG. 1 is a configuration diagram of a wavelength division multiplexing optical transmission system in the first embodiment of the present invention, FIG. 2 is a conceptual diagram of the system in the embodiment of FIG. 1, and FIG. 3 is a diagram of the system in the second embodiment of the present invention. LJ
Figure 4 is a conceptual diagram of the system in the embodiment shown in Figure 3, Figure 5 is a diagram of a conventional wavelength division multiplexed optical transmission system, and Figure 6 is a diagram of a conventional wavelength division multiplexed optical transmission system. It is a conceptual diagram of transmission. 10 (13 to 10 (n+m+p)--modulation signal source, 1
1 (1) to 11 (n + m + p ) - = light source,
12-----Optical coupler, 13... Optical splitter, 14a, 14b14 c-- Optical demultiplexer, 15
m~15 (n+m+p)...optical-electrical transformer,
16... Optical fiber, 17... Optical transmitter, 18... Optical receiver, 210) to 21(n)
...Wavelength separation characteristics of the optical demultiplexer 14a, 21(n
+1) ~ 21 (14 m)... Wavelength separation characteristics of the optical demultiplexer 14b, 21 (n + m + 1) 21 (n + m + p)
...Wavelength separation characteristics of the optical demultiplexer 14c, 22(1
)~22 (n+m+p)... Spectrum of wavelength-multiplexed light.
Claims (8)
いくつかの光結合器を具備する光送信部と、光分岐器と
いくつかの光分波器と複数の光−電気変換器を具備する
光受信部からなり、前記いくつかの光分波器は互いに重
ならない波長選択特性を有し、かつ、それぞれの前記光
分波器は波長分離領域を共有しないことを特徴とする波
長多重光伝送システム。(1) An optical transmitter equipped with several optical couplers for wavelength multiplexing with a plurality of light sources with different wavelengths, an optical splitter, several optical demultiplexers, and a plurality of optical-to-electrical converters. wavelength multiplexed light, characterized in that the several optical demultiplexers have wavelength selection characteristics that do not overlap with each other, and each of the optical demultiplexers does not share a wavelength separation region. transmission system.
を用いることを特徴とする請求項（１）記載の波長多重
光伝送システム。(2) The wavelength division multiplexing optical transmission system according to claim (1), characterized in that an optical coupler is used by integrating an optical coupler and an optical splitter.
ことを特徴とする請求項（１）記載の波長多重光伝送シ
ステム。(3) The wavelength multiplexing optical transmission system according to claim (1), wherein a diffraction grating is used as a wavelength dispersion element in the optical demultiplexer.
求項（１）記載の波長多重光伝送システム。(4) The wavelength multiplexed optical transmission system according to claim (1), characterized in that a semiconductor laser is used as a light source.
合波された光を光結合させる光結合器を具備する光送信
部と、光分岐器と分岐された光を波長分離するいくつか
の光分波器と複数の光−電気変換器を具備する光受信部
からなり、前記いくつかの光合波器は互いに重ならない
光合波特性を有し、かつ、それぞれの前記光合波器は光
合波領域を共有せず、また、前記いくつかの光分波器は
互いに重ならない光分波特性を有し、かつ、それぞれの
前記光分波器は光分波領域を共有しないことを特徴とす
る波長多重光伝送システム。(5) An optical transmitter that includes a plurality of light sources with different wavelengths, several optical multiplexers, and an optical coupler that optically couples the multiplexed lights, and an optical splitter that separates the wavelengths of the branched lights. It consists of an optical receiving section including an optical demultiplexer and a plurality of optical-to-electrical converters, and the several optical multiplexers have optical multiplexing characteristics that do not overlap with each other, and each of the optical multiplexers has optical multiplexing characteristics that do not overlap with each other. do not share an optical multiplexing region, and the several optical demultiplexers have optical demultiplexing characteristics that do not overlap with each other, and each of the optical demultiplexers does not share an optical demultiplexing region. A wavelength multiplexed optical transmission system featuring:
を用いることを特徴とする請求項（５）記載の波長多重
光伝送システム。(6) The wavelength division multiplexing optical transmission system according to claim (5), characterized in that an optical coupler is used by integrating an optical coupler and an optical branching device.
ことを特徴とする請求項（５）記載の波長多重光伝送シ
ステム。(7) The wavelength multiplexing optical transmission system according to claim (5), characterized in that the optical demultiplexer uses a diffraction grating as a wavelength dispersion element.
求項（５）記載の波長多重光伝送システム。(8) The wavelength multiplexed optical transmission system according to claim (5), characterized in that a semiconductor laser is used as a light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1040497A JPH02219330A (en) | 1989-02-20 | 1989-02-20 | Wavelength multiplexing optical transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1040497A JPH02219330A (en) | 1989-02-20 | 1989-02-20 | Wavelength multiplexing optical transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02219330A true JPH02219330A (en) | 1990-08-31 |
Family
ID=12582204
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1040497A Pending JPH02219330A (en) | 1989-02-20 | 1989-02-20 | Wavelength multiplexing optical transmission system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02219330A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6137613A (en) * | 1997-02-14 | 2000-10-24 | Nec Corporation | Optical transmission apparatus in which light signal with selected wavelength is modulated with selected data signal |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6281136A (en) * | 1985-10-03 | 1987-04-14 | Nec Corp | Wavelength multiplex optical receiver |
| JPS62153838A (en) * | 1985-12-27 | 1987-07-08 | Hitachi Ltd | signal selection device |
-
1989
- 1989-02-20 JP JP1040497A patent/JPH02219330A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6281136A (en) * | 1985-10-03 | 1987-04-14 | Nec Corp | Wavelength multiplex optical receiver |
| JPS62153838A (en) * | 1985-12-27 | 1987-07-08 | Hitachi Ltd | signal selection device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6137613A (en) * | 1997-02-14 | 2000-10-24 | Nec Corporation | Optical transmission apparatus in which light signal with selected wavelength is modulated with selected data signal |
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