JPS6219817A - Optical branching and coupling device - Google Patents
Optical branching and coupling deviceInfo
- Publication number
- JPS6219817A JPS6219817A JP15842085A JP15842085A JPS6219817A JP S6219817 A JPS6219817 A JP S6219817A JP 15842085 A JP15842085 A JP 15842085A JP 15842085 A JP15842085 A JP 15842085A JP S6219817 A JPS6219817 A JP S6219817A
- Authority
- JP
- Japan
- Prior art keywords
- light
- optical
- prism
- cylindrical lens
- optical fiber
- 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
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4246—Bidirectionally operating package structures
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、光フアイバ通信等に利用される光分岐結合装
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 branching/coupling device used in optical fiber communications and the like.
（従来の技術）
従来の光分岐結合装置について、第３図により説明する
。同図において、従来の光分岐結合装置は、４本の光フ
ァイバ１ないし４にそれぞれ１本ずつ結合した４個の１
／４ピッチ円柱レンズ５ないし８を、相互に結合した２
個の偏光プリズム９およびｌＯに結合したもので、上記
の４本の光ファイバエないし４のうち分岐結合用の２本
の光ファイバ３および４は、それぞれ光コネクタ（図示
せず）等で結合した光ファイバ１１および１２の端末で
、１／２ピッチ円柱レンズ１３および１４によってそれ
ぞれ受光素子１５および例えば半導体レーザなどの発光
素子１６に結合している。(Prior Art) A conventional optical branching and coupling device will be explained with reference to FIG. In the figure, the conventional optical branching/coupling device has four optical fibers 1 to 4 coupled one to each.
/4 pitch cylindrical lenses 5 to 8 are mutually coupled.
The two optical fibers 3 and 4 for branching and coupling among the four optical fibers 3 and 4 mentioned above are each coupled with an optical connector (not shown) or the like. The ends of the optical fibers 11 and 12 are coupled to a light receiving element 15 and a light emitting element 16, such as a semiconductor laser, through 1/2 pitch cylindrical lenses 13 and 14, respectively.
このような構成の光分岐結合装置の動作について説明す
る。光ファイバ１から光分岐結合装置に入力した光は、
１／４ピッチ円柱レンズ５によって平行光となり、偏光
プリズム９で反射光と透過光に分かれ、反射光はレンズ
７によって集束されて光ファイバ３に出力し、光コネク
タ（図示せず）等を経て光ファイバ１１に伝達され、１
／２ピッチ円柱レンズ１３により集束されて受光素子１
５に結合し、透過光は偏光プリズム１０を通過した後、
１／４ピッチ円柱レンズ６に結合する。The operation of the optical branching/coupling device having such a configuration will be explained. The light input from the optical fiber 1 to the optical branching and coupling device is
It becomes parallel light by the 1/4 pitch cylindrical lens 5, is divided into reflected light and transmitted light by the polarizing prism 9, and the reflected light is focused by the lens 7 and output to the optical fiber 3, and then passes through an optical connector (not shown), etc. transmitted to the optical fiber 11,
/2 pitch cylindrical lens 13 focuses the light to the light receiving element 1.
5, and the transmitted light passes through the polarizing prism 10, and then
It is coupled to a 1/4 pitch cylindrical lens 6.
発光素子１６の出射光は、１／２ピッチ円柱レンズ１４
で集束されて光ファイバ１２に入り、光コネクタ（図示
せず）等を経て光ファイバ４に伝達されて光分岐結合装
置に入力する。１／４ピッチ円柱レンズ８によって平行
光となった光は、偏光プリズム１０で反射し、１／４ピ
ッチ円柱レンズ８で集合されて光ファイバ２に出力する
。The light emitted from the light emitting element 16 is transmitted through the 1/2 pitch cylindrical lens 14.
The light is focused into the optical fiber 12, transmitted to the optical fiber 4 via an optical connector (not shown), etc., and input to the optical branching/coupling device. The light, which is made parallel by the 1/4 pitch cylindrical lens 8, is reflected by the polarizing prism 10, collected by the 1/4 pitch cylindrical lens 8, and output to the optical fiber 2.
（発明が解決しようとする問題点）
しかしながら、上記のような構成では、偏光フィルタに
対する入射角がほぼ４５°のため、発光素子として半導
体レーザを用いた場合は特に偏光の影響が大きく、光の
分岐率にゆらぎ、が生じ、出力パワーの変動が大きいと
いう問題があった。また、発光素子および受光素子と光
ファイバとを結合する組立てと、光分岐結合装置の組立
てとが別々に行われる構成となっているため、組立時間
が長くなり安価な装置が提供できないという問題もあっ
た。(Problem to be Solved by the Invention) However, in the above configuration, since the angle of incidence on the polarizing filter is approximately 45°, the influence of polarization is particularly large when a semiconductor laser is used as a light emitting element, and the light There was a problem in that the branching rate fluctuated and the output power fluctuated greatly. In addition, because the assembly of the light emitting element, the light receiving element, and the optical fiber and the assembly of the optical branching and coupling device are performed separately, there is a problem that the assembly time becomes long and it is not possible to provide an inexpensive device. there were.
本発明は上記の問題点を解決するもので１組立て時間が
短かく、光出力の安定した優れた特性を有する光分岐結
合装置を提供しようとするものである。The present invention solves the above-mentioned problems and provides an optical branching/coupling device which requires a short assembly time and has excellent characteristics such as stable optical output.
（問題点を解決するための手段）
本発明は上記の問題点を解決するために、フィルタに対
する光の入射角の余角が直角に近い構造とし、かつ、受
光素子および発光素子をそれぞれ光分岐部および光結合
部に直接結合できるものである。(Means for Solving the Problems) In order to solve the above problems, the present invention has a structure in which the complementary angle of the incident angle of light to the filter is close to a right angle, and the light-receiving element and the light-emitting element are each optically branched. It can be directly coupled to the optical coupling section and the optical coupling section.
（作 用）
上記のように構成することにより、フィルタに対する光
の入射角の余角が直角に近いため、偏光の影響による出
力のゆらぎが少なく、安定した出力パワーを得ることが
でき、また、受光素子および発光素子を光ファイバを介
さずに直接光分岐部および光結合部にそれぞれ結合でき
るため、組立て時の調整工程が省略され組立て時間が大
幅に短縮する。(Function) With the above configuration, since the complementary angle of the incident angle of light to the filter is close to a right angle, there is little output fluctuation due to the influence of polarization, and stable output power can be obtained. Since the light-receiving element and the light-emitting element can be directly coupled to the optical branching section and the optical coupling section, respectively, without using an optical fiber, adjustment steps during assembly are omitted, and assembly time is significantly shortened.
（実施例）
本発明による光分岐結合装置の２つの実施例をそれぞれ
第１図および第２図により説明する。(Embodiments) Two embodiments of the optical branching/coupling device according to the present invention will be described with reference to FIG. 1 and FIG. 2, respectively.
第１図は第１の実施例の構成図で、２本の光ファイバＩ
７および１８がそれぞれ結合した２個の１／４ピッチ円
柱レンズ１９および２０が、それぞれ三角プリズム２１
および２２を挟み四角プリズム２３の相対向する光学的
平面に結合している。四角プリズム２３の光学的平面に
結合された光ファイバ１７および１８の光軸上のそれぞ
れの対向面に、偏光フィルタ２４および２５が蒸着によ
り形成され、その上にそれぞれ三角プリズム２６および
２７を挟み１／４ピッチ円柱レンズ２８および２９が結
合している。上記の三角プリズム２１，２２．２６およ
び２７は、光の偏光フィルタへの入射角の余角θが直角
に近くなるように挿入するものである。なお、記号２８
および２９で示した１／４ピッチ円柱レンズの光軸上に
それぞれ受光素子３０および発光素子３１が配設されて
いる。FIG. 1 is a block diagram of the first embodiment, in which two optical fibers I
Two 1/4 pitch cylindrical lenses 19 and 20 in which lenses 7 and 18 are combined, respectively, form a triangular prism 21.
and 22 are coupled to opposing optical planes of a square prism 23. Polarizing filters 24 and 25 are formed by vapor deposition on the respective opposing surfaces on the optical axis of optical fibers 17 and 18 coupled to the optical plane of square prism 23, and triangular prisms 26 and 27 are sandwiched thereon, respectively. /4 pitch cylindrical lenses 28 and 29 are coupled. The triangular prisms 21, 22, 26, and 27 are inserted so that the complementary angle θ of the angle of incidence of light onto the polarizing filter is close to a right angle. In addition, symbol 28
A light-receiving element 30 and a light-emitting element 31 are arranged on the optical axes of quarter-pitch cylindrical lenses indicated by 29 and 29, respectively.
このように構成された光分岐結合装置の動作について説
明する。光ファイバ１７から光分岐結合装置に入力した
光は、１／４ピッチ円柱レンズ１９で平行光となり三角
プリズム２１を通過して四角プリズム２３に入射し偏光
フィルタ２４により透過光と反射光に分かれる。透過光
は、三角プリズム２６を通過し１／４ピッチ円柱レンズ
２８で集束されて出力し。The operation of the optical branching/coupling device configured in this way will be explained. Light input from the optical fiber 17 to the optical splitting/coupling device becomes parallel light by the 1/4 pitch cylindrical lens 19, passes through the triangular prism 21, enters the square prism 23, and is split into transmitted light and reflected light by the polarizing filter 24. The transmitted light passes through a triangular prism 26, is focused by a 1/4 pitch cylindrical lens 28, and is output.
その先軸上に配設された受光素子３０に結合する。It is coupled to a light receiving element 30 disposed on its front axis.
反射光は１反射の法則に従って四角プリズム２３の中を
逆行しその一部が偏光フィルタ２５で再び反射され、三
角プリズム２２を通過し１／４ピッチ円柱レンズ２０に
よって集束し光ファイバ１８に結合する。The reflected light travels backward through the square prism 23 according to the law of one reflection, a portion of which is reflected again by the polarizing filter 25, passes through the triangular prism 22, is focused by the 1/4 pitch cylindrical lens 20, and is coupled to the optical fiber 18. .
受光素子３１の出射光は、１／４ピッチ円柱レンズ２９
によって平行光となり三角プリズム２７を通過し、さら
に偏光フィルタ２５を透過して四角プリズム２３に入射
する。さらに、四角プリズム２３および三角プリズム２
２を通過し、１／４ピッチ円柱レンズ２０で集束し光フ
ァイバ１８に結合する。The light emitted from the light receiving element 31 is transmitted through a 1/4 pitch cylindrical lens 29.
The light becomes parallel light, passes through the triangular prism 27 , further passes through the polarizing filter 25 , and enters the square prism 23 . Furthermore, a square prism 23 and a triangular prism 2
2 and is focused by a 1/4 pitch cylindrical lens 20 and coupled to an optical fiber 18.
このように、分岐結合の機能を果す偏光フィルタに対す
る光の入射角の余角θが直角に近いため、偏光の影響に
よる分岐率のゆらぎが小さく、安定した出力パワーが得
られる。In this way, since the complementary angle θ of the incident angle of light to the polarizing filter that performs the function of branching and coupling is close to a right angle, fluctuations in the branching rate due to the influence of polarization are small, and stable output power can be obtained.
第２図は本発明による光分岐結合装置の第２の実施例の
構成図で、２本の光ファイバ１７および１８がそれぞれ
結合した２個の１７４ピッチ円柱レンズ１９および２０
が、それぞれ光学的平面４面を有する六角プリズム３２
の主側の相対向面に直接結合されている。六角プリズム
３２の下側の相対向面にはそれぞれ偏光フィルタ２４お
よび２５が蒸着によって形成され、その上に三角プリズ
ム２６および２７を挟んで１／４ピッチ円柱レンズ２８
および２９が結合している。さらに、上記の１７４ピッ
チ円柱レンズ２８および２９の光軸上に受光素子３０お
よび発光素子３１が配設されている。FIG. 2 is a block diagram of a second embodiment of the optical branching and coupling device according to the present invention, in which two 174-pitch cylindrical lenses 19 and 20 are coupled with two optical fibers 17 and 18, respectively.
is a hexagonal prism 32 each having four optical planes.
is directly connected to the opposite facing surface of the main side. Polarizing filters 24 and 25 are formed by vapor deposition on the opposing surfaces on the lower side of the hexagonal prism 32, and a 1/4 pitch cylindrical lens 28 is placed on top of the polarizing filters 24 and 25 with triangular prisms 26 and 27 in between.
and 29 are combined. Further, a light receiving element 30 and a light emitting element 31 are arranged on the optical axes of the 174 pitch cylindrical lenses 28 and 29.
以上のように構成された第２の実施例の動作について説
明する。光ファイバ１７から光分岐結合装置に入力した
光は、１／４ピッチ円柱レンズ１９で平行光となり六角
プリズム３２を通過して偏光フィルタ２４に到達し、透
過光と反射光に分かれる。透過光は、三角プリズム２６
を通過し１／４ピッチ円柱レンズ２８で集束し、受光素
子３ｏに結合する。反射光は、六角プリズム３２の中を
逆行し、再び偏光フィルタ２５で反射し六角プリズム３
２の中を再び通過し１／４ピッチ円柱レンズ２０で集束
されて出方し、光ファイバ１８に結合する。The operation of the second embodiment configured as above will be explained. Light input from the optical fiber 17 to the optical branching/coupling device is converted into parallel light by the 1/4 pitch cylindrical lens 19, passes through the hexagonal prism 32, reaches the polarizing filter 24, and is split into transmitted light and reflected light. The transmitted light is transmitted through a triangular prism 26
, is focused by the 1/4 pitch cylindrical lens 28, and coupled to the light receiving element 3o. The reflected light travels backward through the hexagonal prism 32, is reflected again by the polarizing filter 25, and returns to the hexagonal prism 3.
2, is focused by a 1/4 pitch cylindrical lens 20, exits, and is coupled to an optical fiber 18.
発光素子３１の出射光は、１／４ピッチ円柱レンズ２９
で平行光となり、三角プリズム２７を通過し、偏光フィ
ルタ２５を透過し、さらに六角プリズム３２を通過して
１／４ピッチ円柱レンズ２ｏで集束されて光ファイバ１
８に結合する。The light emitted from the light emitting element 31 is transmitted through a 1/4 pitch cylindrical lens 29.
It becomes parallel light, passes through the triangular prism 27, passes through the polarizing filter 25, and further passes through the hexagonal prism 32, and is focused by the 1/4 pitch cylindrical lens 2o to the optical fiber 1.
Combines with 8.
このような構成の第２の実施例では、受光素子３０およ
び発光素子３１が光分岐結合装置の下側に結合されるた
め、駆動回路との接続が容易になる利点が加わる。In the second embodiment having such a configuration, since the light receiving element 30 and the light emitting element 31 are coupled to the lower side of the optical branching and coupling device, there is an added advantage that connection with the drive circuit is facilitated.
（発明の効果）
以上説明したように１本発明によれば、光を分岐するフ
ィルタに対する光の入射角の余角を直角に近くすること
によって、分岐率のゆらぎを小さくしたもので、安定し
た出方の光分岐結合装置が得られる。また、受光素子お
よび発光素子をそれぞれ直接光分岐部および光結合部に
結合できるため、組立て時の調整工程が省けるため、組
立て時間を大幅に短縮することができるばがりでなく、
小型化が可能となるという著しい効果が得られる。(Effects of the Invention) As explained above, according to the present invention, fluctuations in the branching rate are reduced by making the complementary angle of the incident angle of the light to the filter that splits the light close to a right angle, resulting in stable An optical branching/coupling device is obtained. Furthermore, since the light-receiving element and the light-emitting element can be directly coupled to the optical branching part and the optical coupling part, respectively, the adjustment process during assembly can be omitted, which not only greatly reduces the assembly time, but also
A remarkable effect is obtained in that miniaturization becomes possible.
第１図および第２図は本発明による光分岐結合装置の第
１および第２の実施例の構成図、第３図は従来の光分岐
結合装置の構成図である。
１、２．３．４．１１，１２．１７．１８・・・光ファ
イバ、５ 、６ 、７ 、８ 、１９，２０，２８．２
９−１／４ピッチ円柱レンズ、 ９．１０・・・偏光プ
リズム、１３゜１４・・・１／２ピッチ円柱レンズ、１
５．３０・・・受光素子、１６ｉ、３１・・・発光素子
、 ２１，２２，２６，２７・・・三角プリズム、２
３・・・四角プリズム、２４゜２５・・・偏光フィルタ
、３２川六角プリズム。
第１図1 and 2 are block diagrams of first and second embodiments of the optical branching/coupling device according to the present invention, and FIG. 3 is a block diagram of a conventional optical branching/coupling device. 1, 2.3.4.11, 12.17.18... Optical fiber, 5, 6, 7, 8, 19, 20, 28.2
9-1/4 pitch cylindrical lens, 9.10...polarizing prism, 13°14...1/2 pitch cylindrical lens, 1
5.30... Light receiving element, 16i, 31... Light emitting element, 21, 22, 26, 27... Triangular prism, 2
3...Square prism, 24°25...Polarizing filter, 32 River hexagonal prism. Figure 1
Claims (1)
平行光に変換する円柱レンズと、出力用光ファイバおよ
び受光素子への出力光をそれぞれ集束する円柱レンズと
、上記の入力用光ファイバから入力した平行光を透過光
および反射光に分岐する第１のフィルタならびに上記反
射光を再び反射し、かつ発光素子から入力した平行光を
透過する第２のフィルタをそれぞれの光学的平面に形成
したプリズムとを具備し、入力用光ファイバの入力光が
第１のフィルタで透過光と反射光に分岐して透過光は受
光素子に出力し、反射光は再び第２のフィルタで反射し
て出力用光ファイバに出力し、さらに発光素子の入力光
は第２のフィルタを透過して出力用光ファイバに出力し
て、入力用光ファイバの出力光と結合するように光軸が
設定された光分岐結合装置において、上記プリズム内で
のフィルタへの入射角の余角を直角に近く設定したこと
を特徴とする光分岐結合装置。A cylindrical lens that converts the input light of the input optical fiber and the light emitting element into parallel light, a cylindrical lens that focuses the output light to the output optical fiber and the light receiving element, respectively, and A prism having a first filter that splits the parallel light into transmitted light and reflected light, and a second filter that reflects the reflected light again and transmits the parallel light input from the light emitting element on each optical plane. The input light of the input optical fiber is split into transmitted light and reflected light by the first filter, the transmitted light is output to the light receiving element, and the reflected light is reflected again by the second filter to become output light. Optical branching and coupling in which the optical axis is set so that the input light of the light emitting element passes through a second filter, is output to the output optical fiber, and is combined with the output light of the input optical fiber. An optical branching/coupling device characterized in that the complementary angle of the angle of incidence on the filter in the prism is set close to a right angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15842085A JPS6219817A (en) | 1985-07-19 | 1985-07-19 | Optical branching and coupling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15842085A JPS6219817A (en) | 1985-07-19 | 1985-07-19 | Optical branching and coupling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6219817A true JPS6219817A (en) | 1987-01-28 |
Family
ID=15671364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15842085A Pending JPS6219817A (en) | 1985-07-19 | 1985-07-19 | Optical branching and coupling device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6219817A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5661737A (en) * | 1996-02-09 | 1997-08-26 | Coherent, Inc. | Multi-wavelength laser beam detector with refractive element |
| JP2002131591A (en) * | 2000-10-27 | 2002-05-09 | Fuji Xerox Co Ltd | Optical signal transmitting device and light incident method into translucent medium |
-
1985
- 1985-07-19 JP JP15842085A patent/JPS6219817A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5661737A (en) * | 1996-02-09 | 1997-08-26 | Coherent, Inc. | Multi-wavelength laser beam detector with refractive element |
| JP2002131591A (en) * | 2000-10-27 | 2002-05-09 | Fuji Xerox Co Ltd | Optical signal transmitting device and light incident method into translucent medium |
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