JPS6186714A - Optical coupling parts - Google Patents

Abstract

PURPOSE:To make three-system two-wavelength multiplexed two-way optical communication with a simple circuit, by putting a slightly inclined interference film filter between a rod lens with an interference film filter boned to its front end face and another rod lens put in front of the first mentioned lens so as to face them each other. CONSTITUTION:An interface film filter 27 is put between a rod lens 23, to which a partially transparent interference film filter 24 is bonded, and another rod lens 26 is put in front of the lens 23 so as to face them each other. Double lights of wavelengths lambda1 and lambda2 inputted from an optical fiber 20 become parallel lights after passing through the lens 23 and the light of the wavelength lambda1 is reflected by the filter 24 and outputted to an optical fiber 22. The light having the wavelength lambda2 of the lights passing through the half transparent section of the filter 24 is reflected by the filter 27 and outputted to an optical fiber 21 and the light having the wavelength lambda1 is outputted to an optical fiber 25. Therefore, three-system two-wavelength multiplexed two-way optical transmission becomes possible with a simple circuit which is less in optical energy loss and the transmission quality can be improved while the cost is reduced.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は光通信機器に使用される光結合部品に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an optical coupling component used in optical communication equipment.

（従来例の構成とその問題点） 光通信の実用化が進むに伴って、波長多重光伝送や双方
向光伝送も実施に移され、これらに光分波・合波器、光
分岐・結合器等の光結合部品が多数用いられるようにな
った。(Conventional configurations and their problems) As the practical use of optical communication progresses, wavelength multiplexing optical transmission and bidirectional optical transmission are also being implemented, and optical demultiplexing/combining devices, optical branching/coupling, etc. A large number of optical coupling parts such as containers have come into use.

このような波長多重・双方向光伝送を例として従来の光
結合部品について、第１図により説明する。同図は、波
長λ１およびλ３の光を用い、波長λ１の光では双方で
送信・受信を行う双方向光伝送を、波長λ３の光では片
方が送信または受信のみを行う一方向光伝送をそれぞれ
担当する三系統二波長多重・双方向伝送システムの構成
図である。A conventional optical coupling component will be explained with reference to FIG. 1, taking such wavelength multiplexing/bidirectional optical transmission as an example. The figure uses light with wavelengths λ1 and λ3, and shows two-way optical transmission in which both sides transmit and receive light with wavelength λ1, and one-way optical transmission in which one side only transmits or receives light with wavelength λ3. It is a configuration diagram of the three-system dual-wavelength multiplexing/bidirectional transmission system in charge.

このシステムでは、波長λ１．λ２の光分波・合波器１
および２が伝送用光ファイバ３の両端に接続され、波長
λ、の光の発信側では、光分波・合波器１に波長λ２の
光発信器４が光ファイバ５で、波長λ、の光発信器６と
光受信器７とがそれぞれ光ファイバ８と９とで接続され
た光分岐・結合器１０が光ファイバ１１で、また、波長
λ８の光の受信側では、光分波・合波器２に波長λ３の
光受信器１２が光ファイバ１３で、波長λ１の光発信器
１４と光受信器１５とがそれぞれ光ファイバ１６と１７
とで接続さ　。In this system, the wavelength λ1. λ2 optical demultiplexer/combiner 1
and 2 are connected to both ends of the transmission optical fiber 3, and on the transmission side of the light with the wavelength λ, an optical transmitter 4 with the wavelength λ2 is connected to the optical demultiplexer/combiner 1 via the optical fiber 5, and the optical transmitter 4 with the wavelength λ2 is connected to the optical fiber 5. An optical branching/combining device 10 in which an optical transmitter 6 and an optical receiver 7 are connected by optical fibers 8 and 9, respectively, is an optical fiber 11, and on the receiving side of the light with a wavelength λ8, an optical branching/combining device is connected. In the wave transmitter 2, an optical receiver 12 with a wavelength λ3 is an optical fiber 13, and an optical transmitter 14 and an optical receiver 15 with a wavelength λ1 are connected with optical fibers 16 and 17, respectively.
Connected with .

れた光分岐・結合器１８が光ファイバ１９で、それぞれ
接続されている。The optical branching/coupling devices 18 are connected by optical fibers 19, respectively.

このような構成の三系統二波長多重・双方向伝送システ
ムの動作について説明する。The operation of the three-system dual-wavelength multiplexing/bidirectional transmission system having such a configuration will be explained.

波長λ２の光による一方向光伝送は、光発信器４から出
力された波長λ、の光が、光ファイバ５、光分波・合波
器１．光ファイバ３、光分波・合波器２および光ファイ
バ１３を通って光受信器１２に入力することにより行わ
れる。In unidirectional optical transmission using light with wavelength λ2, light with wavelength λ outputted from optical transmitter 4 is transmitted to optical fiber 5, optical demultiplexer/combiner 1. This is done by inputting the signal to the optical receiver 12 through the optical fiber 3, the optical demultiplexer/combiner 2, and the optical fiber 13.

波長λ、の光による双方向光伝送は、光発信器６から出
力された波長λ１の光が、光ファイバ８、光分岐・結合
器１０．光ファイバ１１．光分波・合波器１、光ファイ
バ３、光分波・合波器２、光ファイバ１９、光分岐・結
合器１８および光ファイバ１７を通って光受信器１５に
、また、光発信器１４から出力された波長λ□の光が、
光ファイバ１６、光分岐・結合器１８、光ファイバ１９
．光分波・合波器２、光ファイバ３．光分波・合波器１
、光ファイバ１１、光分岐・結合器１０および光ファイ
バ９を通って光受信器７に、それぞれ入力して行われる
。In bidirectional optical transmission using light with a wavelength λ, the light with a wavelength λ1 output from the optical transmitter 6 is transmitted through the optical fiber 8, the optical branch/coupler 10, and so on. Optical fiber 11. Optical demultiplexer/combiner 1, optical fiber 3, optical demultiplexer/combiner 2, optical fiber 19, optical branch/combiner 18, and optical fiber 17 to optical receiver 15, and optical transmitter The light of wavelength λ□ output from 14 is
Optical fiber 16, optical branch/coupler 18, optical fiber 19
．． Optical demultiplexer/combiner 2, optical fiber 3. Optical demultiplexer/multiplexer 1
, the optical fiber 11, the optical branch/coupler 10, and the optical fiber 9, and are input to the optical receiver 7, respectively.

このようにして三系統二波長多重・双方向光伝送は行わ
れるが、しかしながら上述のような構成では、光結合部
品の点数が多く、光エネルギーの損失が大きいという問
題点があった。In this way, three-system two-wavelength multiplexing/bidirectional optical transmission is performed, but the above configuration, however, has the problem of a large number of optical coupling parts and a large loss of optical energy.

（発明の目的） 本発明は上記の欠点を解消するもので、１個で光分波・
合波器と光分岐・結合器の機能を設け、簡単な回路で三
系統二波長多重・双方向光伝送システムが構成できる光
結合部品を提供しようとするものである。(Objective of the invention) The present invention solves the above-mentioned drawbacks, and aims to perform optical demultiplexing and demultiplexing with a single unit.
The objective is to provide an optical coupling component that has the functions of a multiplexer and an optical branch/coupler, and can configure a three-system two-wavelength multiplexing/bidirectional optical transmission system with a simple circuit.

（発明の構成） 上記の目的を達成するために１本発明では、後端面に平
行に並べた３本の光ファイバ束が装着され、前端面に一
部が透明の干渉膜フィルタが接着されたロッドレンズと
、後端面に光ファイバが装着されたロッドレンズとを、
これらのロッドレンズ前端面が相対向するように配設し
、さらに、上記前端面間の隙間に僅かな傾斜角を有する
干渉膜フィルタを配置した構成とし、一部が透明の干渉
膜フィルタの干渉膜部は、伝送する２波長の光の内、双
方向伝送用の光を反射するように、また傾斜を有するよ
うに配置された干渉膜フィルタは、片方向伝送用の光を
反射し、双方向伝送用の光を透過するようにして、光分
波・合波器と光分岐・結合器の２つの機能を持たせよう
とするものである。(Structure of the Invention) In order to achieve the above object, in the present invention, three optical fiber bundles arranged in parallel are attached to the rear end surface, and a partially transparent interference film filter is adhered to the front end surface. A rod lens and a rod lens with an optical fiber attached to the rear end surface,
The front end surfaces of these rod lenses are arranged so as to face each other, and an interference film filter having a slight inclination angle is arranged in the gap between the front end surfaces to prevent interference of the partially transparent interference film filter. The film part reflects the light for bidirectional transmission out of the two wavelengths of light transmitted, and the interference film filter arranged with an inclination reflects the light for unidirectional transmission and reflects the light for bidirectional transmission. It is intended to transmit light for direct transmission, and to have two functions: an optical demultiplexer/combiner and an optical branch/combiner.

（実施例の説明） 本発明の実施例について、第２図および第３図により説
明する。(Description of Examples) Examples of the present invention will be described with reference to FIGS. 2 and 3.

第２図は１本発明による光結合部品の構成図で、光分波
および光分岐の機能を利用する場合を例として説明する
と、光結合器は、波長λ、およびλ。FIG. 2 is a block diagram of an optical coupling component according to the present invention.To explain the case where the functions of optical demultiplexing and optical branching are used as an example, the optical coupler has wavelengths λ and λ.

の２重光が入力する光ファイバ２０と、波長λ２の光お
よび波長λ□の光がそれぞれ出力する光ファイバ２１お
よび光ファイバ２２との３本が平行に並べられた光ファ
イバ束がロッドレンズ２３の後端面に装着されており、
その前端面には、半分の面積が透明、半分の面積が波長
λ１の光を反射し波長λ２の光を透過する干渉膜フィル
タ２４が接着されている（図には接着剤は示してない）
、さらに、後端面に光ファイバ２５が装着されたロッド
レンズ２６の前端面が上記ロッドレンズ２３の前端面に
相対向するように配設され、これら両端面間の隙間に波
長λ２の光を反射し波長λ□の光を透過する干渉膜フィ
ルタ２７が配置されたものである。A bundle of three optical fibers arranged in parallel includes an optical fiber 20 into which the double light of λ2 is input, and an optical fiber 21 and an optical fiber 22 through which the light with a wavelength λ2 and the light with a wavelength λ It is attached to the rear end surface,
An interference film filter 24 whose half area is transparent and whose half area reflects light with wavelength λ1 and transmits light with wavelength λ2 is glued to the front end surface (the adhesive is not shown in the figure).
Further, the front end surface of a rod lens 26 having an optical fiber 25 attached to its rear end surface is arranged to face the front end surface of the rod lens 23, and light of wavelength λ2 is reflected in the gap between these end surfaces. An interference film filter 27 that transmits light having a wavelength of λ□ is arranged.

このように構成された光結合部品の動作について説明す
る。光ファイバ２０から入力した波長λ１およびλ２の
２重光は、ロッドレンズ２３によって平行光線となり、
その前端面に接着された干渉膜フィルタ２４の干渉膜部
で波長λ□の光が反射されて、再びロッドレンズ２３で
集束され光ファイバ２２に出力し、干渉膜フィルタ２４
の透明部を透過した上記２重光は、傾斜して配置された
干渉膜フィルタ２７で波長λ２の光が反射され、ロッド
レンズ２３で集束されて光ファイバ２１に出力する。干
渉膜フィルタ２７の傾斜角は、光ファイバ２１と光軸が
一致するように調整されている。The operation of the optical coupling component configured in this way will be explained. Dual light of wavelengths λ1 and λ2 inputted from the optical fiber 20 becomes parallel light beams by the rod lens 23,
The light of wavelength λ□ is reflected by the interference film portion of the interference film filter 24 bonded to the front end face, is focused again by the rod lens 23 and output to the optical fiber 22, and is then reflected by the interference film filter 24.
The double light transmitted through the transparent part is reflected by the interference film filter 27 disposed at an angle, and the light having the wavelength λ2 is focused by the rod lens 23 and output to the optical fiber 21. The inclination angle of the interference film filter 27 is adjusted so that the optical axis coincides with that of the optical fiber 21.

干渉膜フィルタ２７を透過した波長λ、の光は、ロッド
レンズ２６で集束されて光ファイバ２５に出力する。The light having the wavelength λ that has passed through the interference film filter 27 is focused by the rod lens 26 and output to the optical fiber 25 .

第２図中に矢印で示した光の径路は、径路２８が波長λ
□およびλ２の２重光、径路２９および３０が波長λ□
の光、径路３１が波長λ２の光のそれぞれの投射方向を
表わしている。The light path indicated by the arrow in FIG. 2 has a wavelength of λ.
Dual light of □ and λ2, paths 29 and 30 have wavelength λ□
The paths 31 represent the respective projection directions of the light having the wavelength λ2.

このように構成した光結合部品を、光合波器および光結
合器として用いる場合は、上述の径路を逆方向に利用す
ればよい。When the optical coupling component configured in this manner is used as an optical multiplexer and an optical coupler, the above-mentioned path may be used in the opposite direction.

第３図は、波長λ１およびλ２の２波長の光を用い、波
長λ１の光では双方で送信・受信器を行う双方向光伝送
を、波長λ２の光では片方が送信または受信のみを行う
一方向光伝送をそれぞれ担当する三系統二波長多重・双
方向光伝送システムの構成図である。Figure 3 shows two-way optical transmission using two wavelengths of light, λ1 and λ2, with the light of wavelength λ1 acting as a transmitter and receiver on both sides, and the light of wavelength λ2 with one side transmitting or receiving only. FIG. 1 is a configuration diagram of a three-system dual-wavelength multiplexing bidirectional optical transmission system, each responsible for directional optical transmission.

このシステムでは、本発明による光結合部品３２および
３３が伝送用光ファイバ３４の両端に接続され。In this system, optical coupling components 32 and 33 according to the invention are connected to both ends of a transmission optical fiber 34.

さらに、波長λ、の光の発信側では、上記の光結合部品
３２の伝送用光ファイバ３４と並ぶ光ファイバ３５およ
び３６にそれぞれ波長λ２の光発信器３７．および波長
λ１の光発信器３８が、反対側の光ファイバ３９に波長
λ、の光発信器４０が、また、波長λ２の光の受信側で
は、上記の光結合部品３３の伝送用光ファイバ３４と並
ぶ光ファイバ４１および４２に、それぞれ波長λ２の光
受信器４３および波長λ１の光送信器４４が、反対側の
光ファイバ４５に波長λ、の光受信器４６が、それぞれ
接続されている。Furthermore, on the transmitting side of the light with wavelength λ, optical fibers 35 and 36 lined up with the transmission optical fiber 34 of the optical coupling component 32 are connected to optical transmitters 37 with wavelength λ2, respectively. An optical transmitter 38 with a wavelength λ1 is connected to an optical fiber 39 on the opposite side, and an optical transmitter 40 with a wavelength λ2 is connected to an optical fiber 39 on the opposite side. An optical receiver 43 with a wavelength λ2 and an optical transmitter 44 with a wavelength λ1 are connected to the optical fibers 41 and 42 arranged side by side, respectively, and an optical receiver 46 with a wavelength λ is connected to the optical fiber 45 on the opposite side.

このような構成の三系統二波長多重・双方向光伝送シス
テムの動作について説明する。波長λ２による一方向光
伝送は、光発信器３７から出力された波長λ２の光が、
光ファイバ３５、光結合部品３２、光ファイバ３４、光
結合部品３３および光ファイバ４１を通って光受信器４
３に入力する。The operation of the three-system dual-wavelength multiplexing/bidirectional optical transmission system having such a configuration will be explained. In the unidirectional optical transmission using the wavelength λ2, the light with the wavelength λ2 output from the optical transmitter 37 is
The optical receiver 4 passes through the optical fiber 35, the optical coupling component 32, the optical fiber 34, the optical coupling component 33, and the optical fiber 41.
Enter 3.

波長λ□の光による双方向光伝送では、一方向光発信器
４０から出力される波長λ１の光が、光ファイバ３９、
光結合部品３２、光ファイバ３４．光結合部品３３およ
び光ファイバ４５を通って受信器４６に、逆方向は光発
信器４４から波長λ１の光が、光ファイバ４２、光結合
部品３３、光ファイバ３４、光結合部品３２および光フ
ァイバ３６を通って光受信器３８に、それぞれ入力する
。In bidirectional optical transmission using light with wavelength λ□, light with wavelength λ1 output from unidirectional optical transmitter 40 is transmitted through optical fiber 39,
Optical coupling component 32, optical fiber 34. Light with wavelength λ1 passes through the optical coupling component 33 and the optical fiber 45 to the receiver 46, and in the opposite direction from the optical transmitter 44, the light with the wavelength λ1 passes through the optical fiber 42, the optical coupling component 33, the optical fiber 34, the optical coupling component 32, and the optical fiber. 36 and are input to an optical receiver 38, respectively.

このようにして三系統二波長多重・双方向光伝送が行わ
れ、しかも伝送用光ファイバ３４の両端にそれぞれ１個
の光結合部品３２および３３を接続するのみであるから
、伝送システムも簡単となり、かつ、光エネルギーの損
失も少ない三系統二波長多重・双方向光伝送システムが
得られる。In this way, three-system two-wavelength multiplexing/bidirectional optical transmission is performed, and since only one optical coupling component 32 and 33 is connected to each end of the transmission optical fiber 34, the transmission system is also simplified. In addition, a three-system dual-wavelength multiplexing bidirectional optical transmission system with low loss of optical energy can be obtained.

なお、本実施例では、第２図における干渉膜フィルタ２
４は半分の面積に波長λ□の光を反射し波長λ２の光を
透過する干渉膜を形成し、残り半分の面積を透明とした
が、干渉膜を形成する面積を減らしてもよい、このよう
に干渉膜部と透明部の面積比を変えることによって、光
ファイバ２２と２５に入力する波長λ、のエネルギーの
比率を変えることができる。In this example, the interference film filter 2 in FIG.
In No. 4, an interference film that reflects light with wavelength λ□ and transmits light with wavelength λ2 is formed on half the area, and the remaining half area is made transparent, but the area on which the interference film is formed may be reduced. By changing the area ratio of the interference film part and the transparent part, the ratio of energy of the wavelength λ input to the optical fibers 22 and 25 can be changed.

また、干渉膜フィルタ２４の干渉膜部および干渉膜フィ
ルタ２７の透過率を１００％として説明して来たが、透
過率が１００％に達しない場合には、光ファイバ２０．
２１および２２からなる光ファイバ束とロフトレンズ２
３の間に、順に透明部、波長λ２の光を透過し波長λ、
の光を反射する干渉膜部および波長λ１の光を透過し波
長λ２の光を反射する干渉膜部を形成した干渉膜フィル
タを挿入して装着する必要がある。Further, although the explanation has been given assuming that the transmittance of the interference film portion of the interference film filter 24 and the interference film filter 27 is 100%, if the transmittance does not reach 100%, the optical fiber 20.
Optical fiber bundle consisting of 21 and 22 and loft lens 2
During 3, the transparent part transmits the light of wavelength λ2 in order, and the wavelength λ,
It is necessary to insert and install an interference film filter having an interference film part that reflects light of wavelength λ1 and an interference film part that transmits light of wavelength λ1 and reflects light of wavelength λ2.

（発明の効果） 以上説明したように、光分波・合波器と光分岐・結合器
の２つの機能を合わせ持つ、本発明による光結合部品を
使用すれば、簡単でかつ光エネルギーの損失が少ない三
系統二波長多重・双方向光伝送システムが構成でき、シ
ステム構築コストの減少および伝送品質の向上に著しい
効果が得られる。(Effects of the Invention) As explained above, by using the optical coupling component according to the present invention, which has the two functions of an optical demultiplexer/combiner and an optical branch/combiner, it is possible to easily reduce optical energy loss. It is possible to construct a three-system dual-wavelength multiplexing bidirectional optical transmission system with a small amount of noise, which has significant effects in reducing system construction costs and improving transmission quality.

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

第１図は従来の三系統二波長多重・双方向光伝・送シス
テムの構成図、第２図は本発明による光結合部品の構成
図、第３図は第２図の光結合部品を利用した三系統二波
長多重・双方向光伝送システムの構成図である。 １．２・・・光分波・合波器、　３，５，８．９゜１１
．１３，１６，１７，１９，２０，２１，２２，２５，
３４，３５，３６，３９，４１゜４２．４５・・・光フ
ァイバ、　４　、６　、１４，３７，４０．４４・・・
光発信器、　？　、　１２，１５，３８，４３，４６・
・・光受信器、　　１０．１８・・・光分岐・結合器、
２３，２６・・・ロッドレンズ、２４，２７・・・干渉
膜フィルタ、２８．２９，３０．３１・・・光の径路。Figure 1 is a configuration diagram of a conventional three-system two-wavelength multiplexing/bidirectional optical transmission/transmission system, Figure 2 is a configuration diagram of an optical coupling component according to the present invention, and Figure 3 is a diagram using the optical coupling component shown in Figure 2. FIG. 2 is a configuration diagram of a three-system dual-wavelength multiplexing bidirectional optical transmission system. 1.2... Optical demultiplexer/combiner, 3,5,8.9°11
．． 13, 16, 17, 19, 20, 21, 22, 25,
34, 35, 36, 39, 41° 42.45... Optical fiber, 4, 6, 14, 37, 40.44...
Optical transmitter? , 12, 15, 38, 43, 46・
...Optical receiver, 10.18... Optical branch/combiner,
23, 26... Rod lens, 24, 27... Interference film filter, 28.29, 30.31... Light path.

Claims (1)

【特許請求の範囲】[Claims] 後端面に平行に並べた３本の光ファイバ束が装着され、
前端面に一部が透明の干渉膜フィルタが接着されたロッ
ドレンズと、後端面に光ファイバが装着されたロッドレ
ンズとを、これらのロッドレンズの前端面が相対向する
ように配設し、さらに、上記前端面間の隙間に、僅かな
傾斜角を有する干渉膜フィルタが配置されたことを特徴
とする光結合部品。Three optical fiber bundles arranged parallel to the rear end surface are attached,
A rod lens having a partially transparent interference film filter adhered to its front end face and a rod lens having an optical fiber attached to its rear end face are arranged so that the front end faces of these rod lenses face each other, Furthermore, an optical coupling component characterized in that an interference film filter having a slight inclination angle is disposed in the gap between the front end surfaces.