JPS59152417A - Optical star coupler - Google Patents
Optical star couplerInfo
- Publication number
- JPS59152417A JPS59152417A JP2628083A JP2628083A JPS59152417A JP S59152417 A JPS59152417 A JP S59152417A JP 2628083 A JP2628083 A JP 2628083A JP 2628083 A JP2628083 A JP 2628083A JP S59152417 A JPS59152417 A JP S59152417A
- Authority
- JP
- Japan
- Prior art keywords
- optical
- optical fiber
- mixing element
- output side
- star coupler
- 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
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
- G02B6/2808—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using a mixing element which evenly distributes an input signal over a number of outputs
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】
この発明は、光信号を複数のポートに低挿入損失でかつ
ポート間での損失ばらつきが小さくなるように分岐させ
る光スターカプラに関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical star coupler that branches optical signals to a plurality of ports with low insertion loss and with small loss variations among ports.
従来の光スターカプラは第1図に示す構成を用いていた
。第1図において(11は入力側光ファイバ。A conventional optical star coupler used the configuration shown in FIG. In FIG. 1 (11 is an input optical fiber).
(2)はミキシングエレメント、(3)は出力側光ファ
イバである。なお第1図は一例として入力側1oポート
、出力側10ポートからなる光スターカプラの構成を示
している。(2) is a mixing element, and (3) is an output side optical fiber. Note that FIG. 1 shows, as an example, the configuration of an optical star coupler consisting of 10 ports on the input side and 10 ports on the output side.
10本の上記入力側光ファイバfilは水平面上に一列
に配列され、矩形状のミキシングエレメント(2)の入
力側端面に接合されていた、そして、1本以上の入力側
光ファイバ(11より伝送されてきた光信号は、ミキシ
ングエレメント(2)に入力側端面より入射し、出力側
端面全面にわたってほぼ一様な強度分布となるように内
部で混ぜ合わされていた。The ten input side optical fibers fil were arranged in a line on a horizontal plane and were joined to the input side end face of the rectangular mixing element (2), and one or more input side optical fibers (11) The optical signals entered into the mixing element (2) from the input side end face are mixed internally so as to have a substantially uniform intensity distribution over the entire output side end face.
そして上記出力側端面に、水平面上に一列に配列された
10本の出力側光ファイバ(3)全接合させることKよ
り上記出力側端面がらの光信号を分岐し。Then, the optical signal from the output side end face is branched by connecting all ten output side optical fibers (3) arranged in a row on a horizontal plane to the output side end face.
出力側の各ポートにおいてほぼ等しい光信号強度を得て
いた。Approximately equal optical signal strength was obtained at each port on the output side.
ところで、ミキシングエレメント(2)は、第2図に示
すよう、に、高い屈折率をもつガラス厚膜(4)ヲこれ
より低い屈折率をもつガラス被覆(5)でfa 5構成
となっていた。By the way, as shown in Fig. 2, the mixing element (2) had an FA 5 configuration consisting of a glass thick film (4) with a high refractive index and a glass coating (5) with a lower refractive index. .
そして、上記ガラス厚膜(4)とガラス被覆(5)は作
業者が接着剤ではり合わせており1手間と時間がかかる
ため大量生産ができず、ミキシングエレメント(2)は
非常に高価なものとなり、このため装置価格も非常に高
くなる欠点があった。さらに、ガラス厚膜(4)とガラ
ス被1(5)’にはり合わせている接着剤の層から光信
号が漏れるため挿入損失が犬ぎ(なる欠点があったっ
この発明はこれらの欠点を除去するため、ミキシングエ
レメントとして矩形コアをもつ光ファイバを用いて装置
の低価格化および低損失化を図ったもので、以下図面に
ついて詳細に説明する。The thick glass film (4) and the glass coating (5) are glued together by an operator, which takes time and effort, making mass production impossible, and the mixing element (2) is very expensive. Therefore, there is a drawback that the cost of the device becomes very high. In addition, the optical signal leaks from the adhesive layer bonded to the thick glass film (4) and the glass cover 1 (5)', resulting in a high insertion loss.This invention eliminates these drawbacks. Therefore, an optical fiber having a rectangular core is used as a mixing element to reduce the cost and loss of the apparatus.The drawings will be described in detail below.
第3図は、この発明の実施例の構成図である。FIG. 3 is a block diagram of an embodiment of the present invention.
第3図において(1)は入力側光ファイバ、(2)はミ
キシングエレメント、T3+は出力側光ファイバであり
。In FIG. 3, (1) is an input side optical fiber, (2) is a mixing element, and T3+ is an output side optical fiber.
また、上記ミキシングエレメント(2)は第4図に示す
ような矩形コア(6)およびクラッド(7)からなる矩
形コア型光ファイバである、さらに第4図においてAお
よびBは矩形コア(6)の横および縦方向の長さである
。なお1第3図は一例として入力側10ボート、出力側
10ボートからなる光スターカプラを示している。Further, the mixing element (2) is a rectangular core type optical fiber consisting of a rectangular core (6) and a cladding (7) as shown in FIG. The horizontal and vertical lengths of Note that FIG. 3 shows, as an example, an optical star coupler consisting of 10 ports on the input side and 10 ports on the output side.
10本の上記入力側光ファイバ(1)および出力側光フ
ァイバ(3)は、それらの端面が第5図に示す配置とな
るように束ねられており、それぞれミキシングエレメン
ト(2)の入力側端面および出力側端面に接合されてい
るうただし、第5図において(7)および(8)は光フ
ァイバのクラッドおよびコアであり。The ten input-side optical fibers (1) and output-side optical fibers (3) are bundled so that their end faces are arranged as shown in FIG. 5, and the input-side end face of the mixing element (2) respectively In FIG. 5, (7) and (8) are the cladding and core of the optical fiber.
WおよびLは光ファイバ束の全てのコア部分を包含する
破線で示した矩形の横および縦方向の長さである。1本
以上の上記入力側光ファイバ(11より伝送されてきた
光信号は、上記ミキシングエレメント(2)の矩形コア
(6)に入射し、出力端面で一様な強度分布となるよう
に内部で混ぜ合わされた後。W and L are the horizontal and vertical lengths of the dashed rectangle that encompasses all the core portions of the optical fiber bundle. The optical signal transmitted from one or more of the input optical fibers (11) enters the rectangular core (6) of the mixing element (2), and is internally processed so as to have a uniform intensity distribution at the output end face. After being mixed.
出力端面に接合された出力側光ファイバ(3)に均等な
強度で分岐される。The output side optical fiber (3) is branched with uniform strength to the output side optical fiber (3) joined to the output end face.
ところで、上記矩形コア(6)の横および縦方向の長さ
AおよびBと、第5図に示した光7アイノくの全てのコ
ア部分を包含する矩形の横および縦方向の長gwおよび
Lとは第(11式および第(2)式の関係がある。By the way, the lengths A and B in the horizontal and vertical directions of the rectangular core (6), and the lengths gw and L in the horizontal and vertical directions of the rectangle that includes all the core parts of the optical 7-eye shown in FIG. There is a relationship between Equation (11) and Equation (2).
A≧W
B≧L
上記第(1)式および第(2)式を満たし、入カ側光フ
ァイバ束、出力側光ファイバ束およびミキシングエレメ
ント(2)′ft中心軸を合わせて接合し、さらに。A≧W B≧L Satisfying the above formulas (1) and (2), the input side optical fiber bundle, the output side optical fiber bundle, and the mixing element (2)′ft are joined so that their central axes are aligned, and .
ミキシングエレメント(2)のNA(開口数)を入力側
光フアイバ(++のNAK対して最適な1直に設定して
おけば、ミキシングエレメント(2)の入力側端面から
入力した元信号を、パワーの損失なく混ぜ合わせながら
出力側路面に伝送することができる。If the NA (numerical aperture) of the mixing element (2) is set to 1, which is optimal for the NAK of the input side optical fiber (++), the original signal input from the input side end face of the mixing element (2) can be It is possible to mix and transmit the signals to the output road surface without any loss.
その結果、各々の出力側光フアイバ(3)に従来装置に
比べて大きなパワーで、しかも均等に光信号全分岐させ
ることができる。As a result, all optical signals can be evenly branched to each output optical fiber (3) with greater power than in the conventional device.
以上述べたように、 ミキシングエレメントとして矩
形コア型光ファイバを用いているため、大量生産できる
とともに、従来装置に存在した接着剤層による光信号の
漏れ全除去でき、装置の低価格化と低損失化全実現でき
る利点がある。As mentioned above, since a rectangular core optical fiber is used as the mixing element, mass production is possible, and optical signal leakage due to the adhesive layer that existed in conventional equipment can be completely eliminated, resulting in lower equipment costs and lower loss. It has the advantage of being fully realized.
なお9以上は入力側1oボート、出力側1oボートの場
合について説明したが、この発明はこれに限らず任意の
ボート数のものに使用してもよい。Incidentally, although the case of 1o boats on the input side and 1o boats on the output side has been described above, the present invention is not limited to this and may be used for any number of boats.
また1以上は、光フアイバ10本を下から3本。For 1 or more, 10 optical fibers are used, 3 from the bottom.
4本、3本と3段に積み上げて束にした入力側光フアイ
バ束および出力側光フアイバ束を用いた場合について説
明したが、この発明シまこれに限らずコア部分が全てミ
キシングエレメントの矩形コア内に入るように光ファイ
バを任意の形状で束にした入力側光ファイバ束および出
方側光ファイバ東金用いてもよい。Although the case where the input side optical fiber bundle and the output side optical fiber bundle which are stacked in three stages (4 fibers, 3 fibers, etc.) are used has been described, this invention is not limited to this, and the core part is entirely rectangular as a mixing element. An input-side optical fiber bundle and an output-side optical fiber Togane may be used, in which optical fibers are bundled in an arbitrary shape so as to enter the core.
以上のように、この発明に係る光スターカプラでVよ、
ミキシングエレメントとして矩形コア型光ファイバを用
いているため、大量生産できるとともに、従来装置に存
在したミキシングエレメント中の接着剤層からの光信号
の漏れ全除去でき、装置の低価格化と低損失化を実現で
きる利点がある。As mentioned above, with the optical star coupler according to this invention, V.
Since a rectangular core optical fiber is used as the mixing element, mass production is possible, and optical signal leakage from the adhesive layer in the mixing element that existed in conventional equipment can be completely eliminated, resulting in lower cost and lower loss equipment. It has the advantage of being able to achieve
第1図は従来の光スターカプラの構成図、第2図は従来
の光スターカプラに使用されていたミキシンクエレメン
トノ構成図、第3図はこの発明による光スターカプラの
一実施例の構成図、菓4図はこの発明による光スターカ
プラに用いた゛ミキシングエレメントの構成図、第5図
はこの発明にょる光スターカプラに用いた光ファイバ束
の端面を示した図である。
図中(1)ハ入力側元ファイバ1(2)はミキシングエ
レメント、(3)は出力側光ファイバ、(4)はガラス
厚膜、(5)はガラス被覆、(6)は矩形コア、(7)
はクラッド、(8)はコアである。
なお9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。
特許出願人 工業技術院長 石板域−第1図
第2図
γ
第5図FIG. 1 is a configuration diagram of a conventional optical star coupler, FIG. 2 is a configuration diagram of a mixing element used in a conventional optical star coupler, and FIG. 3 is a configuration diagram of an embodiment of an optical star coupler according to the present invention. Fig. 4 is a configuration diagram of a mixing element used in the optical star coupler according to the present invention, and Fig. 5 is a diagram showing an end face of an optical fiber bundle used in the optical star coupler according to the present invention. In the figure, (1) C input side original fiber 1 (2) is a mixing element, (3) is an output side optical fiber, (4) is a thick glass film, (5) is a glass coating, (6) is a rectangular core, ( 7)
is the cladding, and (8) is the core. In FIG. 9, the same or corresponding parts are designated by the same reference numerals. Patent applicant Director of the Agency of Industrial Science and Technology Slate area - Figure 1 Figure 2 γ Figure 5
Claims (1)
して接合し、光信号を複数の光ファイバに分岐したり、
あるいは複数の光ファイバからの光信号を合流させる光
スターカプラにおいて、上記ミキシングエレメントとし
て矩形のコアをもつ光ファイバを用いたことを特徴とす
る光スターカプラ。By inserting all the mixing elements between two optical fiber bundles and splicing them, you can branch the optical signal into multiple optical fibers,
Alternatively, an optical star coupler that combines optical signals from a plurality of optical fibers is characterized in that an optical fiber having a rectangular core is used as the mixing element.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2628083A JPS59152417A (en) | 1983-02-21 | 1983-02-21 | Optical star coupler |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2628083A JPS59152417A (en) | 1983-02-21 | 1983-02-21 | Optical star coupler |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS59152417A true JPS59152417A (en) | 1984-08-31 |
Family
ID=12188870
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2628083A Pending JPS59152417A (en) | 1983-02-21 | 1983-02-21 | Optical star coupler |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS59152417A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02116808A (en) * | 1988-09-30 | 1990-05-01 | American Teleph & Telegr Co <Att> | Passive light waveguide device |
US5475776A (en) * | 1990-12-20 | 1995-12-12 | The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland | Optical mixing device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4198118A (en) * | 1976-09-27 | 1980-04-15 | The Boeing Company | Power equalizing multiport optical coupler |
JPS5692505A (en) * | 1979-12-27 | 1981-07-27 | Dainichi Nippon Cables Ltd | Production of optical fiber |
-
1983
- 1983-02-21 JP JP2628083A patent/JPS59152417A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4198118A (en) * | 1976-09-27 | 1980-04-15 | The Boeing Company | Power equalizing multiport optical coupler |
JPS5692505A (en) * | 1979-12-27 | 1981-07-27 | Dainichi Nippon Cables Ltd | Production of optical fiber |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02116808A (en) * | 1988-09-30 | 1990-05-01 | American Teleph & Telegr Co <Att> | Passive light waveguide device |
JPH0445805B2 (en) * | 1988-09-30 | 1992-07-28 | Amerikan Terefuon Ando Teregurafu Co | |
US5475776A (en) * | 1990-12-20 | 1995-12-12 | The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland | Optical mixing device |
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