JP2002062445A - Y branching optical waveguide - Google Patents
Y branching optical waveguideInfo
- Publication number
- JP2002062445A JP2002062445A JP2000250466A JP2000250466A JP2002062445A JP 2002062445 A JP2002062445 A JP 2002062445A JP 2000250466 A JP2000250466 A JP 2000250466A JP 2000250466 A JP2000250466 A JP 2000250466A JP 2002062445 A JP2002062445 A JP 2002062445A
- Authority
- JP
- Japan
- Prior art keywords
- optical waveguide
- branch
- waveguide
- width
- branching
- 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.)
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- Optical Integrated Circuits (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、導波路型光部品特
に１入力２出力の機能を有するＹ分岐光導波路に関する
ものである。The present invention relates to a waveguide type optical component, and more particularly to a Y-branch optical waveguide having a function of one input and two outputs.
【０００２】[0002]
【従来の技術】図３は従来のＹ分岐光導波路を示す。こ
のＹ分岐光導波路は入力導波路１０１と、この入力導波
路１０１に接続され出力側の幅が広がったテーパ導波路
１０２と、このテーパ導波路１０２に互いに接すること
なく一定の間隔で接続して入力された光を２方向に分岐
する分岐導波路１０３，１０４とで構成されている（例
えば、特開平０７−１９８９７号公報）。分岐導波路１
０３，１０４の中心線は正弦曲線である。テーパ導波路
１０２と分岐導波路１０３の接続部１０５、すなわち分
岐導波路１０３の分岐部１０５における光導波路の幅
と、分岐導波路１０３の出射端１０７における光導波路
の幅は異なっている。同様に、テーパ導波路１０２と分
岐導波路１０４の接続部１０６、すなわち分岐導波路１
０４の分岐部１０６における光導波路の幅と、分岐導波
路１０４の出射端１０８における光導波路の幅も異なっ
ている。2. Description of the Related Art FIG. 3 shows a conventional Y-branch optical waveguide. This Y-branch optical waveguide is formed by connecting an input waveguide 101, a tapered waveguide 102 connected to the input waveguide 101, and having a wider output side, at regular intervals without being in contact with the tapered waveguide 102. It is composed of branch waveguides 103 and 104 for branching input light in two directions (for example, Japanese Patent Application Laid-Open No. 07-19897). Branch waveguide 1
The center line of 03,104 is a sine curve. The width of the optical waveguide at the connecting portion 105 between the tapered waveguide 102 and the branch waveguide 103, that is, at the branch portion 105 of the branch waveguide 103, and the width of the optical waveguide at the emission end 107 of the branch waveguide 103 are different. Similarly, the connecting portion 106 between the tapered waveguide 102 and the branch waveguide 104, that is, the branch waveguide 1
The width of the optical waveguide at the branch portion 106 of the optical waveguide 04 differs from the width of the optical waveguide at the emission end 108 of the branch waveguide 104.
【０００３】しかし、分岐部１０５における光導波路の
幅から出射端１０７における光導波路の幅への変化率
と、分岐部１０６における光導波路の幅から出射端１０
８における光導波路の幅への変化率は等しい。However, the rate of change from the width of the optical waveguide at the branch portion 105 to the width of the optical waveguide at the emission end 107 and the width of the optical waveguide at the branch portion 106 determine the emission end 10.
8, the rate of change to the width of the optical waveguide is equal.
【０００４】これら両者の変化率が等しい時、入力導波
路１０１から入射された光のパワーは等しく分配され
る。When the rates of change of these two are equal, the power of light incident from the input waveguide 101 is equally distributed.
【０００５】[0005]
【発明が解決しようとする課題】図４は従来のＹ分岐光
導波路において分岐導波路１０３，１０４の中心線とし
て採用した正弦曲線２０１を示す。FIG. 4 shows a sinusoidal curve 201 used as the center line of the branch waveguides 103 and 104 in the conventional Y-branch optical waveguide.
【０００６】この正弦曲線２０１はｘ−ｙ平面におい
て、１周期分の長さの正弦曲線である。このｘ−ｙ座標
系を、正弦曲線２０１の原点近傍における接線をｙ軸と
する新しい座標系のＸ−Ｙ座標系に回転する。その回転
角はθである。Ｘ−Ｙ座標系で考えた場合、正弦曲線２
０１の入射端２０２及び出射端２０３は各々Ｙ軸と平行
方向を向いている。したがって、入射端２０２や出射端
２０３に直線状の導波路を接続する際は都合が良い。The sine curve 201 is a sine curve having a length of one cycle on the xy plane. The xy coordinate system is rotated to a new XY coordinate system having a tangent line near the origin of the sine curve 201 as a y-axis. The rotation angle is θ. When considered in the XY coordinate system, a sine curve 2
The entrance end 202 and the exit end 203 of 01 are each oriented in a direction parallel to the Y axis. Therefore, it is convenient to connect a linear waveguide to the input end 202 or the output end 203.
【０００７】しかし、出射端２０３に特定の角度を持っ
た光導波路を接続する場合、長い曲がり導波路を用いて
接続する必要があるため、これを適用した光導波路素子
の長さが長くなるという問題があった。However, when an optical waveguide having a specific angle is connected to the emission end 203, it is necessary to connect using a long bent waveguide, so that the length of the optical waveguide element to which this is applied becomes longer. There was a problem.
【０００８】そこで、本発明の目的は、上述した従来技
術が有する課題を解消し、後段に特定の角度を持った光
導波路を接続する場合、短い曲がり導波路を使用して接
続することができ、これを適用した光導波路素子の長さ
を短く抑えることができるＹ分岐光導波路を提供するこ
とにある。Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, and to connect an optical waveguide having a specific angle at a later stage by using a short bent waveguide. It is another object of the present invention to provide a Y-branch optical waveguide that can reduce the length of an optical waveguide device to which the present invention is applied.
【０００９】[0009]
【課題を解決するための手投】請求項１記載の発明は、
１本の光導波路を伝搬してきた光を２本の分岐導波路に
よリ２方向に分岐し、当該分岐導波路の分岐部から出射
端までの光導波路中心線が各々正弦曲線であるＹ分岐光
導波路において、上記正弦曲線の長さが略１／２周期で
終端することを特徴とするものである。In order to solve the problem, the invention according to claim 1 is:
The light propagating through one optical waveguide is branched in two directions by two branch waveguides, and the Y-branch in which the optical waveguide center line from the branch portion of the branch waveguide to the emission end is a sinusoidal curve. The optical waveguide is characterized in that the length of the sinusoidal curve terminates at about 1/2 cycle.
【００１０】請求項２記載の発明は、請求項１記載のも
のにおいて、各々の分岐導波路で分岐部と出射端間での
幅の変化率が異なることを特徴とするものである。A second aspect of the present invention is characterized in that, in the first aspect, the rate of change of the width between the branch portion and the emission end is different in each branch waveguide.
【００１１】一般に、正弦曲線の入射端及び出射端がＹ
軸と平行であるＸ−Ｙ座標系において、正弦曲線の１／
２周期分での出射端は、Ｙ軸と特定の角度をなすことに
なる。この特定の角度をなしている出射端に、特定の角
度を持った光導波路を接続する場合、短い曲がり導波路
で接続が可能になる。In general, the sinusoidal entrance and exit ends are Y
In an XY coordinate system parallel to the axis, 1 /
The emission end in two cycles forms a specific angle with the Y axis. In the case where an optical waveguide having a specific angle is connected to the emission end having the specific angle, the connection can be made with a short bend waveguide.
【００１２】本発明では、正弦曲線の長さが略１／２周
期で終端するため、分岐導波路の出射端がＹ軸と特定の
角度をなすことになる。この特定の角度をなしている出
射端に、特定の角度を持った光導波路を接続する場合、
従来のものに比べて、短い曲がり導波路で接続が可能に
なる。In the present invention, since the length of the sinusoidal curve terminates at approximately a half cycle, the exit end of the branch waveguide makes a specific angle with the Y axis. When an optical waveguide having a specific angle is connected to the output end having the specific angle,
The connection can be made with a short bent waveguide as compared with the conventional one.
【００１３】[0013]
【発明の実施の形態】以下、本発明によるＹ分岐光導波
路の一実施形態を添付した図面を参照して詳細に説明す
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a Y-branch optical waveguide according to the present invention will be described in detail with reference to the accompanying drawings.
【００１４】図１において、このＹ分岐光導波路は、基
板（図示せず）上のクラッド内に形成され光を入力する
直線上の入力導波路１と、この入力導波路１に接続され
出力側の幅が広がったテーパ導波路２と、このテーパ導
波路２に互いに接することなく一定の間隔で接続して、
入力された光を２方向に分岐する分岐導波路３，４とで
構成されている。尚、基板にはＳｉＯ2、Ｓｉ、ＩｎＰ
等の半導体又はＬｉＮｂＯ3等の強誘電体のいずれを用
いてもよい。分岐導波路３，４の中心線は、図２に示す
ように、正弦曲線２１であり、この正弦曲線２１の長さ
は図中に実線で示すように略１／２周期の長さで終端す
る。In FIG. 1, the Y-branch optical waveguide includes a linear input waveguide 1 formed in a clad on a substrate (not shown) for inputting light, and an output side connected to the input waveguide 1. Is connected to the tapered waveguide 2 at a constant interval without contacting each other,
It is composed of branch waveguides 3 and 4 for branching input light in two directions. The substrate is made of SiO 2 , Si, InP.
Or a ferroelectric such as LiNbO 3 may be used. The center line of each of the branch waveguides 3 and 4 is a sinusoidal curve 21 as shown in FIG. 2, and the length of the sinusoidal curve 21 is terminated by a length of approximately 1/2 period as shown by a solid line in the figure. I do.
【００１５】テーパ導波路２と分岐導波路３の接続部
５、すなわち分岐導波路３の分岐部５における光導波路
の幅と、分岐導波路３の出射端７における光導波路の幅
は異なって形成されている。同様に、テーパ導波路２と
分岐導波路４の接続部６、すなわち分岐導波路４の分岐
部６における光導波路の幅と、分岐導波路４の出射端８
における光導波路の幅も異なっている。The width of the optical waveguide at the connecting portion 5 between the tapered waveguide 2 and the branch waveguide 3, ie, the branch portion 5 of the branch waveguide 3, and the width of the optical waveguide at the emission end 7 of the branch waveguide 3 are formed differently. Have been. Similarly, the connection portion 6 between the tapered waveguide 2 and the branch waveguide 4, that is, the width of the optical waveguide at the branch portion 6 of the branch waveguide 4, and the emission end 8 of the branch waveguide 4
Are also different in the width of the optical waveguide.
【００１６】しかし、分岐部５における光導波路の幅か
ら出射端７における光導波路の幅への変化率と、分岐部
６における光導波路の幅から出射端８における光導波路
の幅への変化率は等しい。However, the rate of change from the width of the optical waveguide at the branch 5 to the width of the optical waveguide at the emission end 7 and the rate of change from the width of the optical waveguide at the branch 6 to the width of the optical waveguide at the emission end 8 are: equal.
【００１７】これら両者の変化率が等しい時、入力導波
路１から入射された光のパワーは等しく分配される。When the two change rates are equal, the power of the light incident from the input waveguide 1 is equally distributed.
【００１８】本実施形態では、図２に実線で示すよう
に、正弦曲線２１はｘ−ｙ平面において、１／２周期分
の長さで終端する正弦曲線である。このｘ−ｙ座標系
を、正弦曲線２１の原点近傍における接線をｙ軸とする
新しい座標系のＸ−Ｙ座標系に角度θで持って回転す
る。Ｘ−Ｙ座標系で考えた場合、正弦曲線２１の入射端
２２はＹ軸と平行方向を向いている。In the present embodiment, as shown by the solid line in FIG. 2, the sine curve 21 is a sine curve that terminates on the xy plane with a length corresponding to a half period. The xy coordinate system is rotated at an angle θ with respect to an XY coordinate system of a new coordinate system having a tangent line near the origin of the sine curve 21 as the y axis. When considered in the XY coordinate system, the incident end 22 of the sine curve 21 is oriented in a direction parallel to the Y axis.
【００１９】しかし、出射端２３はＹ軸と特定の角度を
なしている。したがって、このＹ分岐光導波路の後段に
特定の角度を持った光導波路を接続する場合、従来より
も短い曲がり導波路で良いことになる。However, the emission end 23 forms a specific angle with the Y axis. Therefore, in the case where an optical waveguide having a specific angle is connected to the subsequent stage of the Y-branch optical waveguide, a bent waveguide shorter than a conventional one is sufficient.
【００２０】本実施形態では、図１に示すように、出射
端７，８は特定の角度を持っているため、後段に特定の
角度を持った光導波路を接続する場合、従来よりも短い
曲がり導波路で接続することができる。In the present embodiment, as shown in FIG. 1, since the emission ends 7 and 8 have a specific angle, when an optical waveguide having a specific angle is connected at a subsequent stage, the bending is shorter than in the conventional case. They can be connected by a waveguide.
【００２１】したがって、これを適用した光導波路素子
の長さを短くして、従来の半分程度の長さに抑えること
ができる。Therefore, the length of the optical waveguide element to which this is applied can be reduced to about half the length of the conventional one.
【００２２】別の実施形態として、分岐部５における光
導波路の幅から出射端７における光導波路の幅への変化
率と、分岐部６における光導波路の幅から出射端８にお
ける光導波路の幅への変化率を異ならせてもよい。As another embodiment, the rate of change from the width of the optical waveguide at the branching section 5 to the width of the optical waveguide at the emission end 7 and the width of the optical waveguide at the branching section 6 to the width of the optical waveguide at the emission end 8 are described. May be different.
【００２３】この実施形態では、入力導波路１から入射
された光のパワーを非対称に分配して出力することがで
きる。In this embodiment, the power of light incident from the input waveguide 1 can be asymmetrically distributed and output.
【００２４】[0024]
【発明の効果】本発明では、正弦曲線の長さが略１／２
周期で終端するため、分岐導波路の長さを従来の半分に
することができ、かつ後段に長く接続せず、短距離で特
定の角度を持った光導波路を接続することができ、当該
Ｙ分岐光導波路を用いた光部品の小型化を図ることがで
きる。According to the present invention, the length of the sine curve is approximately 1/2.
Since the branch waveguides are terminated at a period, the length of the branch waveguide can be reduced to half of that of the conventional one, and an optical waveguide having a specific angle can be connected to a short distance without being connected to a long stage. An optical component using the branch optical waveguide can be reduced in size.
【図１】本発明によるＹ分岐光導波路の一実施形態を示
す図である。FIG. 1 is a diagram showing one embodiment of a Y-branch optical waveguide according to the present invention.
【図２】分岐導波路の中心線として採用した正弦曲線を
示す図である。FIG. 2 is a diagram showing a sine curve adopted as a center line of a branch waveguide.
【図３】従来のＹ分岐光導波路を示す図である。FIG. 3 is a diagram showing a conventional Y-branch optical waveguide.
【図４】従来の分岐導波路の中心線として採用した正弦
曲線を示す図である。FIG. 4 is a diagram showing a sinusoidal curve adopted as a center line of a conventional branch waveguide.
１ 入力導波路 ２ テーパ導波路 ３，４ 分岐導波路 ５，６ 分岐部 ７，８ 出射端 ２１ 正弦曲線 ２２ 入射端 ２３ 出射端 DESCRIPTION OF SYMBOLS 1 Input waveguide 2 Tapered waveguide 3, 4 Branch waveguide 5, 6 Branch 7, 8 Outgoing end 21 Sinusoidal curve 22 Incident end 23 Outgoing end
Claims (2)
の分岐導波路によリ２方向に分岐し、当該分岐導波路の
分岐部から出射端までの光導波路中心線が各々正弦曲線
であるＹ分岐光導波路において、上記正弦曲線の長さが
略１／２周期で終端することを特徴とするＹ分岐光導波
路。1. A light propagating through one optical waveguide is branched in two directions by two branch waveguides, and the optical waveguide center lines from the branch portion of the branch waveguide to the emission end are sinusoidal. A Y-branch optical waveguide having a curved Y-branch optical waveguide, wherein the length of the sinusoidal curve terminates at approximately 1/2 cycle.
間での幅の変化率が異なることを特徴とする請求項１記
載のＹ分岐光導波路。2. The Y-branch optical waveguide according to claim 1, wherein the rate of change in width between the branch portion and the output end is different in each of the branch waveguides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000250466A JP2002062445A (en) | 2000-08-22 | 2000-08-22 | Y branching optical waveguide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000250466A JP2002062445A (en) | 2000-08-22 | 2000-08-22 | Y branching optical waveguide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002062445A true JP2002062445A (en) | 2002-02-28 |
Family
ID=18740030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000250466A Pending JP2002062445A (en) | 2000-08-22 | 2000-08-22 | Y branching optical waveguide |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002062445A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003057470A (en) * | 2001-07-30 | 2003-02-26 | Agilent Technol Inc | Compact optical splitter and combiner and its manufacturing method |
| JP2004046032A (en) * | 2002-07-16 | 2004-02-12 | Hitachi Cable Ltd | Y-branch optical waveguide circuit |
-
2000
- 2000-08-22 JP JP2000250466A patent/JP2002062445A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003057470A (en) * | 2001-07-30 | 2003-02-26 | Agilent Technol Inc | Compact optical splitter and combiner and its manufacturing method |
| JP2004046032A (en) * | 2002-07-16 | 2004-02-12 | Hitachi Cable Ltd | Y-branch optical waveguide circuit |
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