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JPS5811916A - Light branching and dividing circuit - Google Patents

Light branching and dividing circuit

Info

Publication number
JPS5811916A
JPS5811916AJP56110364AJP11036481AJPS5811916AJP S5811916 AJPS5811916 AJP S5811916AJP 56110364 AJP56110364 AJP 56110364AJP 11036481 AJP11036481 AJP 11036481AJP S5811916 AJPS5811916 AJP S5811916A
Authority
JP
Japan
Prior art keywords
light
lens
optical
mixing means
light emitting
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
Application number
JP56110364A
Other languages
Japanese (ja)
Inventor
Akihiro Adachi
明宏 足立
Masamitsu Saito
正光 斎藤
Toshio Takei
竹居 敏夫
Yoshio Miyake
三宅 良雄
Rumiko Suganuma
菅沼 ルミ子
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric CorpfiledCriticalMitsubishi Electric Corp
Priority to JP56110364ApriorityCriticalpatent/JPS5811916A/en
Publication of JPS5811916ApublicationCriticalpatent/JPS5811916A/en
Pendinglegal-statusCriticalCurrent

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Abstract

Translated fromJapanese

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。
(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Translated fromJapanese

【発明の詳細な説明】この発明け、光ファイバを用t、−、71中央局、多端
末間双方向伝送系を実現する光回路に関するものである
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical circuit that realizes a two-way transmission system between multiple terminals and a central office using optical fibers.

光ファイバは、耐電磁誘導性、高帯域性、軽量細径等の
利点から従来の電気導体に変わる信号伝送路として注目
されており、これを用ηた光通信方式が検討されている
。光ファイバを用いた光通信方式を実現するためKは様
々なデバイスが必要となるが、現在までに電気信号を光
信号に変換する装置、光信号を電気信号に変換する装置
、ファイバ同志を接続する装置、光を2方向に分割する
装置、光の波長を分割する装置等が開発されてお漫これ
らを用すて信号伝送の最少単位である2局間の単方向伝
送、双方向伝送等が実現されている。現在、光通信方式
の更に複雑な伝送系への適用が求められており。
Optical fibers are attracting attention as signal transmission paths that can replace conventional electrical conductors because of their advantages such as resistance to electromagnetic induction, high bandwidth, and light weight and small diameter, and optical communication systems using optical fibers are being considered. A variety of devices are required to realize an optical communication system using optical fibers, and to date, we have developed equipment that converts electrical signals into optical signals, equipment that converts optical signals into electrical signals, and equipment that connects fibers together. Devices that split light into two directions, devices that split light into two directions, and devices that split wavelengths of light have been developed, and these devices can be used to perform unidirectional transmission, bidirectional transmission, etc. between two stations, which is the minimum unit of signal transmission. has been realized. Currently, there is a need to apply optical communication systems to more complex transmission systems.

これを実現する光デバイスの開発がせまられている。There is an urgent need to develop optical devices that can achieve this.

この発明け、簡単な構成で光ファイバを用いた中央局、
多端未聞双方向伝送系を実現する為に光のミキシング手
段、フィルタ及びレンズを組み合わせた光分岐分波回路
を提案するもので以下図面について詳細に説明する。
With this invention, a central office using optical fiber with a simple configuration,
In order to realize a multi-end bidirectional transmission system, we propose an optical branching/demultiplexing circuit that combines an optical mixing means, a filter, and a lens, and will be described in detail below with reference to the drawings.

第1図はこの発明の一実施例であって9発光素子(1)
の発光部に光のミキシング手段(21が置かれ、光のミ
キシング手段よりミキシングされて出力した光を平行光
束に変換する第1のレンズ(3)、平行光束を複数本の
ファイバからなるファイバ束f41 K fi光する第
2のレンズ(5i、7アイパ束(4)が順に配置されて
いる。又、波長λ1の光を透過し、波長λ2の光を反射
する誘電体、あるいは金属膜で形成されたフィルタ(6
)が第1のレンズ(3)と第2のレンズ(5)の間に平
行光束に対して斜めに挿入されており2反射光を受光素
子(71に集光するための第3のレンズ(8)と受光素
子(71が配置されている。
FIG. 1 shows one embodiment of the present invention, with nine light emitting elements (1).
A light mixing means (21) is placed in the light emitting part, a first lens (3) converts the light mixed and output from the light mixing means into a parallel light beam, and a fiber bundle consisting of a plurality of fibers converts the parallel light beam into a parallel light beam. f41 K fi The second lens (5i, 7 Aiper bundles (4) are arranged in order. It is also made of a dielectric material or metal film that transmits light with wavelength λ1 and reflects light with wavelength λ2. filter (6
) is inserted between the first lens (3) and the second lens (5) obliquely with respect to the parallel light flux, and a third lens ( 8) and a light receiving element (71) are arranged.

波長λ1の光を発光する発光素子(11より出射した光
は壕ず光のミキシング手段(2)により充分にミキシン
グされた後出射する。ミキシングされた光は第1のレン
ズ(3)によシ平行光束に変換されてフィルタ(6)に
入射するがフィルタ(6)は波長λ1の光を透過するの
でそのまま透過し第2のレンズ(5)によシ集光されて
ファイバ束(4)に入射する。ここで光のミキシング手
段(21によって十分光はミキシングされているので発
光素子(1)より出射した光は、はぼ均一に複数本のフ
ァイバに分割される。一方複数本の光ファイバ(4)を
伝播してきた波長λ2の光はファイバ束(4:よし出射
し、第2のレンズ(5)Kよシ平行光束に変換されてフ
ィルタ(6)に入射する。ここでフィルタ(6)は波長
λ2の光を反射するのでフィルタ(6)に入射した波長
λ2の光は全て反射されてレンズ(8)によシ集光され
て受光素子(7)K入射する。
The light emitted from the light emitting element (11) that emits light with a wavelength λ1 is sufficiently mixed by the trench light mixing means (2) and then emitted.The mixed light is mixed by the first lens (3). It is converted into a parallel light beam and enters the filter (6), but since the filter (6) transmits the light of wavelength λ1, it passes through as it is and is condensed by the second lens (5) to form the fiber bundle (4). Here, the light is sufficiently mixed by the light mixing means (21), so the light emitted from the light emitting element (1) is split almost uniformly into a plurality of fibers. The light with a wavelength λ2 that has propagated through the fiber bundle (4) exits the fiber bundle (4), is converted into a parallel light flux through the second lens (5), and enters the filter (6). ) reflects the light of wavelength λ2, so all the light of wavelength λ2 that is incident on the filter (6) is reflected, condensed by the lens (8), and incident on the light receiving element (7)K.

上述した構成の光分岐分波回路におして、光のミキシン
グ手段は周囲を低屈折率の媒質でおおりたガラスロッド
を用することにより容易に得られる。ガラスロッドの一
方の端に入射した光は、ガラスロッドの界面において全
反射を繰シ返すことによシ均一にミキシングされてもう
一方の端よシ出射する。ミキシングされて出射した光は
上述したように第1のレンズ(3)によシ平行光束に変
換されフィルタ(6)に入射し透過した光は第2のレン
ズ(5)によシファイバ束(4)に集光される。ここで
、ミキシングされた光はファイバ束に効率よく入射し、
ファイバ束を構成する一本一本のファイバに均一に分配
される必要がある。このためにはミキシングした光をフ
ァイバ束の入射端面の面積に一致するように集光しなけ
ればならない。又そのさい集光する光束はファイバの開
口数をこえないようにしなければならない。ここでガラ
スロッドの開口径をr1+開口数をNA1.ファイバ束
の開口径をr2+開口数をN A 2 +第1のレンズ
の焦点距離をfl、第2のレンズの焦点距離をf2で表
わすと、 これらの間に次式の関係を成立させれば、上
述した条件は満足され、ミキシングした光は効率よく均
一に一本一本のファイバに分配されるという効果がある
In the optical branching/demultiplexing circuit configured as described above, the light mixing means can be easily obtained by using a glass rod surrounded by a medium with a low refractive index. Light incident on one end of the glass rod is uniformly mixed by repeated total reflection at the interface of the glass rod, and then emitted from the other end. The mixed and emitted light is converted into a parallel light beam by the first lens (3) as described above, and the light that enters and passes through the filter (6) is passed through the second lens (5) and is converted into a parallel light beam by the second lens (5). ). Here, the mixed light efficiently enters the fiber bundle,
It needs to be evenly distributed to each fiber that makes up the fiber bundle. For this purpose, the mixed light must be focused to match the area of the input end face of the fiber bundle. In addition, the condensed light beam must not exceed the numerical aperture of the fiber. Here, the opening diameter of the glass rod is r1 + the numerical aperture is NA1. If the aperture diameter of the fiber bundle is r2 + the numerical aperture is N A 2 + the focal length of the first lens is fl, and the focal length of the second lens is f2, then if we establish the following relationship between them: , the above-mentioned conditions are satisfied, and the mixed light is efficiently and uniformly distributed to each fiber.

上述した光分岐分波回路を用いることにより光ファイバ
を用すた中央局、多端未聞双方向伝送系は容易に実現で
きるもので、第2図にその一例を示す。中央局(91に
は上記の光分岐分波回路(IIが設置されてお)、各端
末に送信する信号は光分岐分波回路の発光素子(1)が
送信器+Il+からの信号で変調され光信号に変換され
る。ここで発光素子+11から出射した波長λ1の光信
号は。
By using the optical branching/demultiplexing circuit described above, a central office, multi-end, unheard, bidirectional transmission system using optical fibers can be easily realized, and an example thereof is shown in FIG. The central station (91 is equipped with the above-mentioned optical branching and demultiplexing circuit (II)), and the signal sent to each terminal is modulated by the light emitting element (1) of the optical branching and demultiplexing circuit with the signal from the transmitter +Il+. The optical signal of wavelength λ1 emitted from the light emitting element +11 is converted into an optical signal.

前述したようにミキシングされて7アイノく束(41に
均一に入射する。ファイバ束の他端はそれぞり、の端末
に接続されており、波長′λ1の光信号は各端末t12
i 、 +13 、 (+41に伝送される。各端末に
けλ1とλ2の光を分割する光分波器o51が光の入出
力部に設置されており、伝送さhてきた波長λ1の光は
光分波器を通って光受信器061に入射する。
As described above, the fiber bundle is mixed and uniformly enters the 7-input fiber bundle (41).The other ends of the fiber bundles are connected to the respective terminals of
i. The light passes through the optical demultiplexer and enters the optical receiver 061.

一方各端末には波長λ2の光を信号として発振する光送
信器面が内蔵されており、中央局に送信する信号は光送
信器■で送信される。光送信器面からの波長λ2の光信
号は、光分波器によりファイバ束(4)K導びかね、中
央局(9)の光分岐分波回路01 VC伝送される。フ
ァイバ束(4)力≧ら出射した波長λ2の端末より送信
された光信号は干渉フィルタ(6)で反射さり、て受光
素子(7)に入射し、電気信号に変換さ引た信号は受信
器08で受信される。以上のようにこの光分岐分波回路
を用いることによシ容易に光ファイバを用すた中央局、
多端床間双方向伝送系を実現する事が可能である。
On the other hand, each terminal has a built-in optical transmitter surface that oscillates light with a wavelength λ2 as a signal, and the signal to be transmitted to the central station is transmitted by the optical transmitter (2). The optical signal of wavelength λ2 from the optical transmitter plane is guided to a fiber bundle (4)K by an optical demultiplexer, and is transmitted to the optical branch/demultiplexer circuit 01 VC of the central office (9). The optical signal transmitted from the end of the fiber bundle (4) with wavelength λ2 emitted from the power ≧ is reflected by the interference filter (6), then enters the light receiving element (7), where it is converted into an electrical signal and the subtracted signal is received. It is received by device 08. As described above, by using this optical branching and demultiplexing circuit, it is easy to connect central stations using optical fibers.
It is possible to realize a multi-end inter-floor bidirectional transmission system.

以上のようにこの発明に係る光分岐分波回路では9発光
部、光のミキシング部、コリメートレンズ、フィルタ、
集光レンズ、および光ファイバ束と順に配置することに
より、光の多分岐及び光の波長多重を同時に行なえるこ
とができ。
As described above, the optical branching/demultiplexing circuit according to the present invention has nine light emitting sections, a light mixing section, a collimating lens, a filter,
By arranging the condenser lens and the optical fiber bundle in this order, multiple branching of light and wavelength multiplexing of light can be performed simultaneously.

これにより光ファイバを用すた中央局、多端末間の双方
向伝送系を容易に実現できるとbう利点がある。
This has the advantage that it is possible to easily realize a bidirectional transmission system between a central office and multiple terminals using optical fibers.

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

第1図はこの発明による光分岐分波回路の一実施例の構
成図、第2図はこの発明を用いた中央局、多端床間双方
向伝送系のブロック図である。図中、(1)け発光素子、mtd光のミキシング手段、
(3)は第1のレンズ、(41け光ファイバ束、(5)
は第2のレンズ、(6)はフィルタ、(7)は受光素子
。(81け第3のレンズ、(9)は中央局、 Qlけ光分
岐分波回路、0】)は送信器、O2,止、圓は端末、 
(151は光分波器、061は光受信器、 [+?)は
光送信器、 (11は受信器である。なお図中、同一あ
るいは相当部分には同一符号を付して示しである。第 15fi第2図
FIG. 1 is a block diagram of an embodiment of an optical branching/demultiplexing circuit according to the present invention, and FIG. 2 is a block diagram of a central office, multi-terminal inter-floor bidirectional transmission system using the present invention. In the figure, (1) a light emitting element, mtd light mixing means,
(3) is the first lens, (41 optical fiber bundle, (5)
is a second lens, (6) is a filter, and (7) is a light receiving element. (81 third lens, (9) is the central station, Ql optical branching and demultiplexing circuit, 0]) is the transmitter, O2, stop, circle is the terminal,
(151 is an optical demultiplexer, 061 is an optical receiver, [+?) is an optical transmitter, (11 is a receiver. In the figure, the same or corresponding parts are indicated by the same symbols. .15fi Figure 2

Claims (1)

Translated fromJapanese
【特許請求の範囲】(111本又は複数本の第1の光伝送路の出力端。あるIAは1個又は複数個の発光素子の光発光部に接続
された光のミキシング手段と、この光のミキシング手段
よシミキシングされて出力した光をほぼ平行光束に変換
する第1のレンズと、上記の平行光束を複数本の第2の
光伝送路に集光する第2のレンズと、第1のレンズと第
2のレンズの間に平行光束に対して斜めに配着されるフ
ィルタとから構成される事を特徴とする光分岐分波回路
。(21光のミキシング手段として周囲を低屈折率の媒質
でおおったガラスロッドを用いたことを特徴とする特許
請求の範囲第【11項記載の光分岐分波回路。(3)  光のミキシング手段として周囲を低屈折率の
媒質でおおったガラスロッドを用い、ガラスロッドの開
口径r1+ 開口数NAI+と複数本の第2の光伝送路
の開ロ径r2.開口数NA2゜第1のレンズの焦点距離
t1,11!、2のレンズがほぼ成立することを特徴と
する特許M求の範囲第(1)項記載の光分岐分波回路。
[Claims] (Output end of 111 or more first optical transmission lines. An IA includes a light mixing means connected to a light emitting part of one or more light emitting elements, and a light mixing means connected to a light emitting part of one or more light emitting elements. a first lens that converts the light output by the mixing means into a substantially parallel light beam; a second lens that focuses the parallel light beam onto a plurality of second optical transmission paths; An optical branching/demultiplexing circuit characterized by comprising a filter disposed obliquely with respect to the parallel light beam between the lens and the second lens. The optical branching and demultiplexing circuit according to claim 11, characterized in that a glass rod covered with a medium of 11 is used. (3) A glass rod whose periphery is covered with a medium of low refractive index as a light mixing means. Using a rod, the aperture diameter r1+ of the glass rod, the numerical aperture NAI+, the aperture diameter r2 of the plurality of second optical transmission paths, the numerical aperture NA2°, the focal length of the first lens t1, 11!, the lens of 2 is approximately An optical branching/demultiplexing circuit according to item (1) of the scope of Patent M, characterized in that
JP56110364A1981-07-151981-07-15Light branching and dividing circuitPendingJPS5811916A (en)

Priority Applications (1)

Application NumberPriority DateFiling DateTitle
JP56110364AJPS5811916A (en)1981-07-151981-07-15Light branching and dividing circuit

Applications Claiming Priority (1)

Application NumberPriority DateFiling DateTitle
JP56110364AJPS5811916A (en)1981-07-151981-07-15Light branching and dividing circuit

Publications (1)

Publication NumberPublication Date
JPS5811916Atrue JPS5811916A (en)1983-01-22

Family

ID=14533911

Family Applications (1)

Application NumberTitlePriority DateFiling Date
JP56110364APendingJPS5811916A (en)1981-07-151981-07-15Light branching and dividing circuit

Country Status (1)

CountryLink
JP (1)JPS5811916A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication numberPriority datePublication dateAssigneeTitle
JPS59147117U (en)*1983-03-221984-10-01三菱電線工業株式会社 Wavelength multiplexing optical transceiver module
JPH0233109A (en)*1988-06-151990-02-02American Teleph & Telegr Co <Att>Double wavelength optical communication former
US5318453A (en)*1992-10-301994-06-07Hwang Chung HoElectric wall receptacle

Citations (2)

* Cited by examiner, † Cited by third party
Publication numberPriority datePublication dateAssigneeTitle
JPS5387243A (en)*1977-01-101978-08-01Matsushita Electric Ind Co LtdLight signal propagator
JPS5397446A (en)*1977-02-071978-08-25Hitachi LtdOptical fiber branching inserter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication numberPriority datePublication dateAssigneeTitle
JPS5387243A (en)*1977-01-101978-08-01Matsushita Electric Ind Co LtdLight signal propagator
JPS5397446A (en)*1977-02-071978-08-25Hitachi LtdOptical fiber branching inserter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication numberPriority datePublication dateAssigneeTitle
JPS59147117U (en)*1983-03-221984-10-01三菱電線工業株式会社 Wavelength multiplexing optical transceiver module
JPH0233109A (en)*1988-06-151990-02-02American Teleph & Telegr Co <Att>Double wavelength optical communication former
US5318453A (en)*1992-10-301994-06-07Hwang Chung HoElectric wall receptacle

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