JPH0721564B2 - Waveguide type branch circuit - Google Patents
Waveguide type branch circuitInfo
- Publication number
- JPH0721564B2 JPH0721564B2 JP61205783A JP20578386A JPH0721564B2 JP H0721564 B2 JPH0721564 B2 JP H0721564B2 JP 61205783 A JP61205783 A JP 61205783A JP 20578386 A JP20578386 A JP 20578386A JP H0721564 B2 JPH0721564 B2 JP H0721564B2
- Authority
- JP
- Japan
- Prior art keywords
- branch circuit
- branch
- refractive index
- region
- waveguide
- 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.)
- Expired - Lifetime
Links
Landscapes
- Optical Integrated Circuits (AREA)
Description
【発明の詳細な説明】 〔概 要〕 導波路型分岐回路であって、Ｙ型分岐部に部分的に屈折
率が異る領域を形成し、この領域の位置、形状、屈折率
差を調整することにより、任意の分岐比に分岐導波させ
ることを可能とする。DETAILED DESCRIPTION [Outline] In a waveguide-type branch circuit, a region having a partially different refractive index is formed in a Y-shaped branch portion, and the position, shape, and refractive index difference of this region are adjusted. By doing so, it is possible to branch and guide to an arbitrary branching ratio.
本発明は光通信に用いられる導波路型分岐回路に関する
ものである。The present invention relates to a waveguide type branch circuit used for optical communication.
導波路型分岐回路はLAN（ローカルエリアネットワー
ク）等の光分岐に用いられているが、その低損失化が要
求されている。The waveguide type branch circuit is used for optical branching of LAN (local area network), etc., but its loss reduction is required.
導波路型分岐回路は第３図ａに示すように電気光学結晶
であるLiNbO3等の基板１に導波路2,2′,2″となる部分
にTiを拡散させるか、あるいはイオン交換を行なってそ
の部分の屈折率を基板より大きくし導波路を形成したも
ので、導波路2,2′,2″はＹ字形をなしており導波路２
からのシングルモードの光を導波路２′と２″に分岐で
きるようになっている。As shown in FIG. 3a, the waveguide type branch circuit diffuses Ti on the substrate 1, such as LiNbO 3 which is an electro-optic crystal, in the portions to be the waveguides 2, 2 ′, 2 ″, or performs ion exchange. The waveguide is formed by making the refractive index of that portion larger than that of the substrate, and the waveguides 2, 2 ', 2 "are Y-shaped.
The light of the single mode from is split into the waveguides 2'and 2 ".
上記従来の導波路型分岐回路では、Ｙ分岐部の損失を小
さくするためには分岐角を小さく（例えば0.2度）しな
ければならないが、分岐角を小さくすると従来の製造プ
ロセスでは第３図ｂに示すように分岐部のくさび状をな
す部分３がぼけてしまい、理想的な形状とならず、ここ
で損失が生ずることになる。またこのため分岐比を自由
に設定することもできないといった問題があった。In the above-mentioned conventional waveguide type branch circuit, the branch angle must be made small (for example, 0.2 degrees) in order to reduce the loss of the Y branch portion. However, if the branch angle is made small, in the conventional manufacturing process, FIG. As shown in (3), the wedge-shaped portion 3 of the branch portion is blurred and does not have an ideal shape, resulting in loss. Therefore, there is a problem that the branching ratio cannot be freely set.
本発明はこのような点に鑑みて創作されたもので、分岐
損失を低減し、且つ分岐比を任意に設定できる導波路型
分岐回路を提供することを目的としている。The present invention was created in view of the above circumstances, and an object of the present invention is to provide a waveguide type branch circuit in which branch loss can be reduced and a branch ratio can be arbitrarily set.
このため本発明においては、基板10上に設けられた、１
本のシングルモード光導波路11を２本のシングルモード
光導波路11′,11″に分岐するＹ型分岐路において、前
記Ｙ型分岐路の分岐部の分岐する２本の光導波路11′,1
1″が合流する部分に、前記光導波路11よりも屈折率が
小さく、かつ、基板10よりも屈折率が大きな台形状の領
域12が形成され、該台形状の領域12は、該領域12の基部
が前記分岐部の端部に固定され、該領域12の先端部が前
記１本のシングルモード光導波路11の中心線から垂直な
方向に移動した位置に設置された形状で設けられている
ことを特徴としている。Therefore, in the present invention, the
In a Y-shaped branch path that branches the single-mode optical waveguide 11 into two single-mode optical waveguides 11 ′ and 11 ″, two optical waveguides 11 ′ and 1 that branch at the branch portion of the Y-type branched path.
A trapezoidal region 12 having a refractive index smaller than that of the optical waveguide 11 and a refractive index larger than that of the substrate 10 is formed in a portion where 1 ″ joins. The base portion is fixed to the end portion of the branch portion, and the tip end portion of the region 12 is provided in a shape installed at a position moved in a direction perpendicular to the center line of the single single-mode optical waveguide 11. Is characterized by.
分岐部に台形状の屈折率が異なる領域を設けることによ
り、従来のくさび状部分のぼけによる損失を防止するこ
とができ、かつ、台形状の屈折率が異なる領域の先端部
を、入射光が伝播してくるシングルモード光導波路の中
心線から垂直な方向に移動した位置に設けることによ
り、任意の分岐比とすることが可能となる。By providing a trapezoidal region with a different refractive index in the branch portion, it is possible to prevent loss due to blurring of the conventional wedge-shaped portion, and the incident light is reflected at the tip of the trapezoidal region with a different refractive index. An arbitrary branching ratio can be obtained by providing the single mode optical waveguide at a position moved in a direction perpendicular to the centerline of the propagating single mode optical waveguide.
第１図は本発明の実施例を示す図である。 FIG. 1 is a diagram showing an embodiment of the present invention.
本実施例は図に示すように、基板10に拡散法又はイオン
交換法でＹ字形の光導波路11,11′,11″を形成したこと
は従来と同様であり、本実施例の要点は、分岐部（光導
波路11′と11″が合流する部分にできる三角形部分の先
端）に台形の屈折率が異なる領域12を形成したことであ
る。この場合基板の屈折率をn1、導波路の屈折率をn2、
台形部の屈折率をn3としたとき、n1＜n3＜n2とするので
ある。In this embodiment, as shown in the drawing, the Y-shaped optical waveguides 11, 11 ′ and 11 ″ are formed on the substrate 10 by the diffusion method or the ion exchange method, which is the same as the conventional one. A trapezoidal region 12 having a different refractive index is formed at the branch portion (the tip of the triangular portion formed at the portion where the optical waveguides 11 'and 11 "join). In this case, the refractive index of the substrate is n 1 , the refractive index of the waveguide is n 2 ,
If the refractive index of the trapezoidal portion is n 3 , then n 1 <n 3 <n 2 .
このように構成された本実施例は、屈折率が異なる領域
12が台形であるため従来の如く製造プロセスによるぼけ
がなく、また、入射光が進行する方向に関して垂直な面
内において、相対的な屈折率がａからｂに向かって徐々
に変化していくため、分岐部での光の損失を抑えながら
２つの光導波路11′,11″に光が分岐する。In this embodiment, which is configured as described above,
Since 12 is trapezoidal, there is no blurring due to the manufacturing process as in the past, and the relative refractive index gradually changes from a to b in the plane perpendicular to the direction in which the incident light travels. , The light is branched into the two optical waveguides 11 'and 11 "while suppressing the loss of light at the branch portion.
また、台形状の領域12の基部を前記分岐部の端部に固定
し、先端部を入射光が伝播してくるシングルモード光導
波路11の中心線から垂直な矢印ｙの方向に僅かに移動し
た位置に設けることにより、その移動量に応じて出射光
の分岐比を任意に設定することができる。第２図は、台
形状領域先端部のシングルモード光導波路の中心からの
位置と分岐比の関係を示す図である。Further, the base of the trapezoidal region 12 was fixed to the end of the branch, and the tip was slightly moved from the center line of the single mode optical waveguide 11 through which incident light propagates in the direction of the vertical arrow y. By providing it at the position, the branching ratio of the emitted light can be arbitrarily set according to the movement amount. FIG. 2 is a diagram showing the relationship between the position of the tip of the trapezoidal region from the center of the single mode optical waveguide and the branching ratio.
また本実施例は、従来の２つの導波路を接近させて形成
した方向性結合器に似た分岐回路又は２つの導波路を交
差させた分岐回路等では波長依存性が強くあらわれるの
に対し、光の分岐が幾何学的であるので波長依存性が小
さいという利点もある。Further, in the present embodiment, the wavelength dependence is strongly exhibited in a branch circuit similar to a conventional directional coupler formed by bringing two waveguides close to each other or a branch circuit having two waveguides crossed, whereas There is also an advantage that the wavelength dependence is small because the branching of light is geometric.
以上述べてきたように本発明によれば、極めて簡単な構
成により低損失で、且つ任意に分岐比を設定することが
でき、実用的には極めて有用である。As described above, according to the present invention, it is possible to set the branching ratio with a low loss and with an extremely simple structure, which is extremely useful in practice.
第１図は本発明の実施例を示す図、 第２図は本発明の実施例の台形の屈折率の異なる領域の
移動量と分岐比の関係を示す図、 第３図は従来の導波路型分岐回路を示す図である。 第１図において、 10は基板、 11,11′,11″は光導波路、 12は台形の屈折率が異なる領域である。FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing a relationship between a movement amount and a branching ratio of regions of the trapezoid of the present invention having different refractive indexes, and FIG. 3 is a conventional waveguide. It is a figure which shows a type | mold branch circuit. In FIG. 1, 10 is a substrate, 11, 11 'and 11 "are optical waveguides, and 12 is a trapezoidal region having a different refractive index.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 白崎 正孝 神奈川県川崎市中原区上小田中1015番地 富士通株式会社内 (72)発明者 女鹿田 直之 神奈川県川崎市中原区上小田中1015番地 富士通株式会社内 (72)発明者 佐脇 一平 神奈川県川崎市中原区上小田中1015番地 富士通株式会社内 (56)参考文献 特開 昭53−120452（ＪＰ，Ａ) 特開 昭54−73062（ＪＰ，Ａ) 特開 昭56−126809（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masataka Shirasaki 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited (72) Inventor, Naoyuki Mekada 1015, Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited (72) Inventor Ippei Sawaki 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa, Fujitsu Limited (56) References JP-A-53-120452 (JP, A) JP-A-54-73062 (JP, A) JP 56-126809 (JP, A)
Claims (2)
ルモード光導波路（11）を２本のシングルモード光導波
路（11′,11″）に分岐するＹ型分岐路において、 前記Ｙ型分岐路の分岐部の分岐する２本の光導波路（1
1′,11″）が合流する部分に、前記光導波路（11）より
も屈折率が小さく、かつ、基板（10）よりも屈折率が大
きな台形状の領域（12）が形成され、該台形状の領域
（12）は、該領域（12）の基部が前記分岐部の端部に固
定され、該領域（12）の先端部が前記１本のシングルモ
ード光導波路（11）の中心線から垂直な方向に移動した
位置に設置された状態で設けられていることを特徴とし
た導波路型分岐回路。1. A Y-shaped branch path provided on a substrate (10) for branching one single-mode optical waveguide (11) into two single-mode optical waveguides (11 ′, 11 ″), Two optical waveguides (1
A trapezoidal region (12) having a smaller refractive index than the optical waveguide (11) and a larger refractive index than the substrate (10) is formed in a portion where the 1 ', 11'') merge. The shaped region (12) has a base portion of the region (12) fixed to an end portion of the branch portion, and a tip portion of the region (12) from the center line of the single mode optical waveguide (11). A waveguide type branch circuit, which is provided in a state of being installed at a position moved in a vertical direction.
で作成されたものであることを特徴とした特許請求の範
囲第１項記載の導波路型分岐回路。2. A waveguide type branch circuit according to claim 1, wherein the branch circuit is formed by means of ion exchange, diffusion or the like.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61205783A JPH0721564B2 (en) | 1986-09-03 | 1986-09-03 | Waveguide type branch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61205783A JPH0721564B2 (en) | 1986-09-03 | 1986-09-03 | Waveguide type branch circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6363007A JPS6363007A (en) | 1988-03-19 |
| JPH0721564B2 true JPH0721564B2 (en) | 1995-03-08 |
Family
ID=16512599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61205783A Expired - Lifetime JPH0721564B2 (en) | 1986-09-03 | 1986-09-03 | Waveguide type branch circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0721564B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5623568A (en) * | 1995-09-15 | 1997-04-22 | Lucent Technologies Inc. | Compact and fabrication tolerant high speed digital optical Y-switches |
| KR19990038490A (en) | 1997-11-05 | 1999-06-05 | 윤종용 | Optical power divider and its manufacturing method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53120452A (en) * | 1977-03-29 | 1978-10-20 | Nec Corp | Integraded optical branching device |
| JPS5473062A (en) * | 1977-11-22 | 1979-06-12 | Mitsubishi Electric Corp | Thin-film mirror type optical branch line |
-
1986
- 1986-09-03 JP JP61205783A patent/JPH0721564B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6363007A (en) | 1988-03-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |