JP2003262894A - Optical filter - Google Patents

Optical filter

Info

Publication number
JP2003262894A
JP2003262894A JP2002063360A JP2002063360A JP2003262894A JP 2003262894 A JP2003262894 A JP 2003262894A JP 2002063360 A JP2002063360 A JP 2002063360A JP 2002063360 A JP2002063360 A JP 2002063360A JP 2003262894 A JP2003262894 A JP 2003262894A
Authority
JP
Japan
Prior art keywords
optical transmission
refractive index
temperature
wavelength
light
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.)
Granted
Application number
JP2002063360A
Other languages
Japanese (ja)
Other versions
JP3860052B2 (en
JP2003262894A5 (en
Inventor
Toshiaki Hattori
俊明 服部
Norifumi Hirota
憲史 廣田
Yoshihiro Uozu
吉弘 魚津
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Rayon Co Ltd
Original Assignee
Mitsubishi Rayon Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Rayon Co Ltd filed Critical Mitsubishi Rayon Co Ltd
Priority to JP2002063360A priority Critical patent/JP3860052B2/en
Priority to PCT/JP2002/011156 priority patent/WO2003038499A1/en
Priority to EP02775405A priority patent/EP1447692A4/en
Priority to CNB028214439A priority patent/CN1307447C/en
Publication of JP2003262894A publication Critical patent/JP2003262894A/en
Priority to US10/835,333 priority patent/US7043113B2/en
Priority to US10/995,350 priority patent/US20050094935A1/en
Publication of JP2003262894A5 publication Critical patent/JP2003262894A5/ja
Application granted granted Critical
Publication of JP3860052B2 publication Critical patent/JP3860052B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical filter which is easy to produce and by which the wavelength of monochromatic light which can be taken out can be changed. <P>SOLUTION: The optical filter 1 is provided with: a refractive index distribution type optical transmission part 4 where a refractive index is continuously reduced from a center toward an outer peripheral part and the distribution constant of the refractive ratio is varied corresponding to a temperature; a connection part 6 for wavelength multiple light provided on one end side of the axial direction of the optical transmission part; a connection part for monochromatic light 10 provided on the other end side of the axial direction of the optical transmission part; and a temperature changing means 12 which changes the temperature of the optical transmission part, changes the emitting positions of the monochromatic light included in the wavelength multiple light incident on the optical transmission part from the connection part for wavelength multiple light from the optical transmission part and selectively makes one of monochromatic lights incident on the connection part for the monochromatic light. <P>COPYRIGHT: (C)2003,JPO

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、特定の波長の光を
選択的に取り出すことができる波長可変光フィルタ(光
スイッチ)に関連する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wavelength tunable optical filter (optical switch) capable of selectively extracting light having a specific wavelength.

【0002】[0002]

【従来の技術】情報伝送容量の増大に伴い、波長が異な
る光にそれぞれ異なった情報を付予し、これら波長の異
なる光を多重して伝送する波長多重伝送方式の伝送シス
テムが採用されている。この伝送システムでは、複数の
波長を含む波長多重光から特定の波長の光を選択的に取
り出すために、光フィルタ、光スイッチ等が使用され
る。
2. Description of the Related Art With the increase of information transmission capacity, a wavelength division multiplex transmission system has been adopted in which different information is added to light having different wavelengths, and the light having different wavelengths is multiplexed and transmitted. . In this transmission system, an optical filter, an optical switch and the like are used to selectively extract light of a specific wavelength from wavelength multiplexed light including a plurality of wavelengths.

【0003】このような光フィルタ、光スイッチとし
て、マッハツェンダー干渉計型光導波路中にグレーティ
ングを配置した光フィルタや、このような光フィルタ
に、クロム、銅などの金属蒸着膜を設けこれに電流を流
して熱を発生させ、光導波路を加熱する薄膜ヒータを取
付けた熱光学光スイッチ等が開発されている。
As such an optical filter and an optical switch, an optical filter in which a grating is arranged in a Mach-Zehnder interferometer type optical waveguide, or such an optical filter is provided with a metal vapor deposition film of chromium, copper or the like and an electric current is applied thereto. A thermo-optical switch equipped with a thin-film heater for heating an optical waveguide by flowing heat is developed.

【0004】[0004]

【発明が解決しようとする課題】しかしながら、上述し
た光導波路を備えた光フィルタおよび光スイッチは、製
作工程が煩雑であるため量産性に欠ける。また、グレー
ティングを製作する際には、コアまたはクラッドに数ミ
クロンあるいはそれ以上の精度で周期的に切欠きを作る
ことが要求されるため、コストが上昇する。
However, the above-described optical filter and optical switch provided with the optical waveguide lacks mass productivity because the manufacturing process is complicated. Further, when manufacturing a grating, it is required to periodically make notches in the core or the cladding with an accuracy of several microns or more, which increases the cost.

【0005】本発明はこのような点に鑑みてなされたも
のであり、製作が容易であり且つ取り出すことができる
単色光の波長を変更することができる光フィルタを提供
することを目的とする。
The present invention has been made in view of the above points, and an object thereof is to provide an optical filter which can be easily manufactured and can change the wavelength of monochromatic light that can be extracted.

【0006】[0006]

【課題を解決するための手段】本発明によれば、中心か
ら外周部に向かって屈折率が連続的に減少し、且つ、該
屈折率の分布定数が温度により変化する屈折率分布型の
光伝送部と、前記光伝送部の軸線方向一端側に設けられ
た波長多重光用接続部と、前記光伝送部の軸線方向他端
側に設けられた単色光用接続部と、前記光伝送部の温度
を変化させ、前記波長多重光用接続部から前記光伝送部
に入射した波長多重光に含まれる単色光の前記光伝送部
からの出射位置を変化させ、該単色光のいずれかを選択
的に前記単色光用接続部に入射させる温度変更手段と、
を備えている、ことを特徴とする光フィルタが提供され
る。
According to the present invention, a refractive index distribution type light in which the refractive index continuously decreases from the center toward the outer peripheral portion and the distribution constant of the refractive index changes with temperature. A transmission part, a wavelength division multiplexed light connection part provided on one axial side of the optical transmission part, a monochromatic light connection part provided on the other axial side of the optical transmission part, and the optical transmission part Of the monochromatic light included in the wavelength-division-multiplexed light incident on the light-transmission unit from the wavelength-division-multiplexed light connection unit is changed, and one of the monochromatic lights is selected. Temperature changing means to be incident on the connection portion for monochromatic light,
An optical filter comprising: is provided.

【0007】このような構成を有する光フィルタによれ
ば、光伝送部の温度を変化させることにより、単色光用
接続部に導かれる単色光の波長が変更されるので、簡単
な構成で、選択的に取り出すことができる光の波長を変
更できる。
According to the optical filter having such a configuration, the wavelength of the monochromatic light guided to the monochromatic light connecting portion is changed by changing the temperature of the optical transmission portion. The wavelength of the light that can be extracted is changed.

【0008】本発明の好ましい態様によれば、前記光伝
送部がプラスチックでできている。又、本発明の他の好
ましい態様によれば、前記光伝送部が略円筒体であり、
前記波長多重光用接続部が、前記光伝送部の軸線と平行
に、前記光伝送部に接続されている。
According to a preferred aspect of the present invention, the optical transmission section is made of plastic. Further, according to another preferable aspect of the present invention, the optical transmission unit is a substantially cylindrical body,
The wavelength-multiplexed light connection unit is connected to the optical transmission unit in parallel with the axis of the optical transmission unit.

【0009】本発明の他の態様によれば、中心から外周
部に向かって屈折率が連続的に減少し、且つ、該屈折率
が温度により変化する屈折率分布型の光伝送部と、前記
光伝送部の温度を変化させる温度変更手段と、を備えて
いることを特徴とする光フィルタが提供される。
According to another aspect of the present invention, a refractive index distribution type optical transmission section in which the refractive index continuously decreases from the center toward the outer peripheral portion and the refractive index changes with temperature, An optical filter comprising: a temperature changing unit that changes the temperature of the optical transmission unit.

【0010】[0010]

【発明の実施の形態】以下、図面を参照して本発明の好
ましい実施形態を詳細に説明する。図1は、本発明の好
ましい実施形態の光フィルタ(光スイッチ)1の構成を
概略的に示す斜視図である。
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view schematically showing the configuration of an optical filter (optical switch) 1 according to a preferred embodiment of the present invention.

【0011】図1に示されているように、光フィルタ1
は、基板2上に取付けられた光伝送部4を備えている。
光フィルタ1は、更に、光伝送部4の一端(入射)側に
配置され波長多重光を入射させる入射側光ファイバ6
と、光伝送部4の他端(出射)側に配置されたプリズム
8と、プリズム8に接続された出射側光ファイバ10
と、光伝送部4の温度を調節する温度調整器12を備え
ている。入射側光ファイバ6は、光伝送部4の中心軸と
平行に光伝送部4に接続されている。
As shown in FIG. 1, the optical filter 1
Includes an optical transmission unit 4 mounted on the substrate 2.
The optical filter 1 is further arranged at one end (incident) side of the optical transmission section 4 and is an incident side optical fiber 6 for making wavelength-multiplexed light incident.
And a prism 8 arranged on the other end (emission) side of the light transmission section 4, and an emission side optical fiber 10 connected to the prism 8.
And a temperature adjuster 12 for adjusting the temperature of the optical transmission unit 4. The incident side optical fiber 6 is connected to the optical transmission unit 4 in parallel with the central axis of the optical transmission unit 4.

【0012】本実施形態では、温度調節器12として、
ペルチェ素子を使用している。ペルチェ素子は、加熱お
よび冷却を効果的に行うことができるの好ましい。しか
しながら、ヒータ等の他の加熱手段又は冷却手段を用い
ても良い。
In this embodiment, as the temperature controller 12,
Peltier element is used. The Peltier element is preferable because it can effectively perform heating and cooling. However, other heating means such as a heater or cooling means may be used.

【0013】光伝送部4を均一に加熱または冷却するた
め、光フィルタ1、特に光伝送部4を、他の樹脂で封止
するか、温度調節器12を筒状に形成し、その中に光伝
送部4を配置するのが好ましい。
In order to uniformly heat or cool the optical transmission part 4, the optical filter 1, particularly the optical transmission part 4 is sealed with another resin, or the temperature controller 12 is formed in a cylindrical shape, and the temperature is adjusted. It is preferable to arrange the optical transmission unit 4.

【0014】光伝送部4は、略円筒状であり中心軸線c
から周辺部に向かって屈折率が連続的に減少する屈折率
分布型の光伝送部である。本実施形態では、光伝送部4
の屈折率nは、下記の式(1)で近似される分布状態に
ある。 N(r)=n0×(1−g2×r2/2)……式(1) n0:中心軸c上の屈折率、 g:屈折率分布定数 r:中心軸cからの半径方向の距離
The optical transmission section 4 is substantially cylindrical and has a central axis c.
Is a refractive index distribution type optical transmission part in which the refractive index continuously decreases from the periphery to the periphery. In this embodiment, the optical transmission unit 4
The refractive index n of is in a distribution state approximated by the following formula (1). N (r) = n 0 × (1-g 2 × r 2/2) ...... formula (1) n 0: refractive index on the central axis c, g: refractive index distribution constant r: radius from the central axis c Directional distance

【0015】光伝送部4は、イオン交換法等を用いて無
機ガラスから製造された光伝送部、または、プラスチッ
クで製造され、その外周がクラッド層(図示せず)で覆
われた光学部品である。光伝送部4は、入射側光ファイ
バ6を経て軸線方向一端側(図1の右側)から入射した
光を、図1に矢印Aで示すように、光伝送部4内を蛇行
させながら伝播して軸線方向他端側(図1の左側)から
出射させる。
The optical transmission part 4 is an optical transmission part made of inorganic glass by an ion exchange method or the like, or an optical part made of plastic and the outer periphery of which is covered with a clad layer (not shown). is there. The optical transmission unit 4 propagates the light incident from one end side (the right side in FIG. 1) in the axial direction through the incident side optical fiber 6 while meandering in the optical transmission unit 4 as indicated by an arrow A in FIG. Light from the other end in the axial direction (left side in FIG. 1).

【0016】入射する光が波長多重光14であるときに
は、中心軸上の屈折率n0と屈折率分布定数gの波長分
散に起因する色収差により、各単色光には、波長によっ
て少しづつ異なる屈折率分布が与えられる。この結果、
光伝送部4に入射した波長多重光14に含まれる各波長
(λ1、λ2、λ3)の単色光16、18、20は、光
伝送部4内で異なる蛇行周期(経路)を有する。このた
め、光伝送部4の一端側の入射した波長多重光14は、
これに含まれる各波長(λ1、λ2、λ3)の単色光
は、波長毎に、単色光16、18、20に分波され、各
単色光は、光伝送部4の他端側の異なった位置から異な
った角度で出射する。
When the incident light is the wavelength division multiplexed light 14, each monochromatic light is refracted slightly differently depending on the wavelength due to the chromatic aberration caused by the wavelength dispersion of the refractive index n 0 on the central axis and the refractive index distribution constant g. The rate distribution is given. As a result,
The monochromatic lights 16, 18, and 20 of the respective wavelengths (λ1, λ2, λ3) included in the wavelength division multiplexed light 14 incident on the optical transmission unit 4 have different meandering periods (paths) within the optical transmission unit 4. Therefore, the wavelength-multiplexed light 14 incident on one end side of the optical transmission unit 4 is
The monochromatic light of each wavelength (λ1, λ2, λ3) contained therein is demultiplexed into monochromatic lights 16, 18, and 20 for each wavelength, and each monochromatic light is different on the other end side of the optical transmission unit 4. Emitted from the position at different angles.

【0017】屈折率は、温度により変化する。円筒体で
ある光伝送部4においては、半径方向に沿って屈折率の
温度依存性(温度変化に対する変化量)が変化している
ため、屈折率分布定数gも温度に依存して変化すること
になる。従って、光伝送部4の温度を変化させることに
より、光伝送部4から光の出射位置を変化させることが
できる。
The refractive index changes with temperature. In the optical transmission part 4 which is a cylindrical body, since the temperature dependence of the refractive index (change amount with respect to temperature change) changes in the radial direction, the refractive index distribution constant g also changes depending on temperature. become. Therefore, by changing the temperature of the optical transmission unit 4, the light emission position from the optical transmission unit 4 can be changed.

【0018】屈折率の変化の程度は、材料の熱膨張係数
に依存する傾向があり、小さい温度変化で大きく屈折率
を変化させようとするする場合には、プラスチック製の
光伝送部を用いることが好ましい。また、屈折率分布定
数を大きく変化させようとする場合は、中心部と外周部
とで構成材料の熱膨張係数の差を大きくとることが好ま
しい。光伝送部4としては後述する屈折率分布の温度依
存性の定数が、5×10-5以上であるものを用いること
が好ましい。
The degree of change in the refractive index tends to depend on the coefficient of thermal expansion of the material, and if it is intended to greatly change the refractive index with a small temperature change, a plastic optical transmission section should be used. Is preferred. In addition, when the refractive index distribution constant is to be largely changed, it is preferable that the difference in the coefficient of thermal expansion of the constituent materials between the central portion and the outer peripheral portion be large. As the light transmission section 4, it is preferable to use one having a temperature dependence constant of a refractive index distribution, which will be described later, of 5 × 10 −5 or more.

【0019】本実施形態の光フィルタ1は、温度調節器
12によって光伝送部4の温度を第1の温度としたとき
に、光伝送部4に入射した波長多重光14に含まれる第
1の波長(λ1)の単色光16が、出射側光ファイバ1
0に入射するように構成されている。また、温度調節器
12によって光伝送部4の温度を第2の温度としたとき
に、図1に示されているように、光伝送部4に入射した
波長多重光14に含まれる第2の波長(λ2)の単色光
18が、出射側光ファイバ10に入射するように構成さ
れている。さらに、温度調節器12によって光伝送部4
の温度を第3の温度としたときに、光伝送部4に入射し
た波長多重光14に含まれる第3の波長(λ3)の単色
光20が、出射側光ファイバ10に入射するように構成
されている。従って、本実施形態では、光伝送部4の温
度を温度調節器12で、第1、第2又は第3の温度にす
ることによって、出射側光ファイバ10に入射させる光
の波長を選択的に変更することができる。
In the optical filter 1 of this embodiment, when the temperature of the optical transmission section 4 is set to the first temperature by the temperature controller 12, the first wavelength-multiplexed light 14 incident on the optical transmission section 4 has the first wavelength. The monochromatic light 16 of the wavelength (λ1) is emitted from the output side optical fiber 1
It is configured to be incident on 0. Further, when the temperature of the optical transmission unit 4 is set to the second temperature by the temperature controller 12, as shown in FIG. 1, the second wavelength contained in the wavelength multiplexed light 14 incident on the optical transmission unit 4 is changed. The monochromatic light 18 having the wavelength (λ2) is configured to enter the emission side optical fiber 10. Further, the temperature controller 12 controls the optical transmission unit 4
When the temperature of is set to the third temperature, the monochromatic light 20 of the third wavelength (λ3) included in the wavelength division multiplexed light 14 incident on the optical transmission unit 4 is incident on the emission side optical fiber 10. Has been done. Therefore, in the present embodiment, the temperature of the optical transmission unit 4 is set to the first, second, or third temperature by the temperature controller 12, so that the wavelength of the light incident on the emission side optical fiber 10 is selectively selected. Can be changed.

【0020】光伝送部4に接続される光ファイバ6、1
0としては、石英ガラス製のガラス光ファイバ、また
は、ポリメタクリル酸メチル、ポリスチレン、ポリカー
ボネートなどのプラスチックからなるプラスチック光フ
ァイバ等が使用される。
Optical fibers 6, 1 connected to the optical transmission section 4
As 0, a glass optical fiber made of quartz glass, a plastic optical fiber made of plastic such as polymethylmethacrylate, polystyrene, or polycarbonate is used.

【0021】接続される光ファイバ6、10の屈折率分
布は、特に限定されるものではなく、ステップインデッ
クス(SI)型ファイバ、グレーディッドインデックス
(GI)型ファイバ等の公知の光ファイバが光ファイバ
8、12として使用可能である。
The refractive index distribution of the optical fibers 6 and 10 to be connected is not particularly limited, and known optical fibers such as step index (SI) type fiber and graded index (GI) type fiber are used. It can be used as 8 and 12.

【0022】このような構成を有する本実施形態の分波
器によれば、複雑な構成および光部品を用いることな
く、簡単な構成で、波長多重光からの特定の波長の光を
分離することができ、且つ、分離することができる波長
を容易に変更できる。
According to the demultiplexer of this embodiment having such a configuration, it is possible to separate light of a specific wavelength from wavelength-multiplexed light with a simple configuration without using a complicated configuration and optical components. And the wavelengths that can be separated can be easily changed.

【0023】本発明は、上記実施形態に限定されず特許
請求の範囲に記載した範囲内で種々の変更、変形が可能
である。
The present invention is not limited to the above-described embodiment, and various changes and modifications can be made within the scope of the claims.

【0024】[0024]

【実施例】次に、図2ないし図4に沿って、本発明の一
実施例を説明する。図2は、本発明の一実施例の光フィ
ルタ101の概略的な構成を示す平面図である。光スイ
ッチ101は、出射側にプリズムが設けられていない点
を除いて、基本的な構成は上記実施形態の光フィルタ1
と同一である。したがって、光フィルタ1の構成要素と
対応する構成要素には、光フィルタ1と同一の100番
台の参照番号を付す。
DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a plan view showing a schematic configuration of the optical filter 101 according to the embodiment of the present invention. The optical switch 101 has the same basic configuration as the optical filter 1 of the above embodiment except that no prism is provided on the exit side.
Is the same as Therefore, the components corresponding to the components of the optical filter 1 are designated by the same reference numbers in the 100s as those of the optical filter 1.

【0025】光フィルタ101では、直径1mm、長さ
8.73mmの屈折率分布型のプラスチック製の光伝送
部104の中心軸cから距離r(0.45mm)の位置
に、入射側光ファイバ106である石英ガラス製のシン
グルモード光ファイバが、中心軸cと平行になるように
端面接続されている。又、温度調節器112としては、
ペルチェ素子が使用されている。入射側光ファイバ10
6から入射させる波長多重光114は、λ1=128
5.4nm、λ2=1523.6nmの単色光が多重さ
れたものである。光伝送部104の温度を20℃とした
ときの、波長λ1に対する光伝送部104の屈折率分布
定数g1は、0.543であり、波長λ2に対する光伝
送部104の屈折率分布定数g2は、0.540であ
る。さらに、波長λ1に対する中心軸c上の屈折率n1
は1.497、波長λ2に対する中心軸c上の屈折率n
2は1.493である。
In the optical filter 101, the incident-side optical fiber 106 is located at a distance r (0.45 mm) from the central axis c of the optical transmission section 104 made of plastic of the gradient index type having a diameter of 1 mm and a length of 8.73 mm. The single mode optical fiber made of quartz glass is connected to the end face so as to be parallel to the central axis c. Further, as the temperature controller 112,
Peltier elements are used. Incident side optical fiber 10
The wavelength-multiplexed light 114 incident from 6 is λ1 = 128
The monochromatic light of 5.4 nm and λ2 = 1523.6 nm is multiplexed. When the temperature of the optical transmission unit 104 is 20 ° C., the refractive index distribution constant g1 of the optical transmission unit 104 with respect to the wavelength λ1 is 0.543, and the refractive index distribution constant g2 of the optical transmission unit 104 with respect to the wavelength λ2 is It is 0.540. Further, the refractive index n1 on the central axis c with respect to the wavelength λ1
Is 1.497, the refractive index n on the central axis c with respect to the wavelength λ2
2 is 1.493.

【0026】上記の式(1)で略近似される屈折率分布
状態を有する光伝送部104での光線マトリクスは、次
式(2)で与えられる。
A ray matrix in the optical transmission section 104 having a refractive index distribution state that is approximately approximated by the above equation (1) is given by the following equation (2).

【数1】 [Equation 1]

【0027】ここで、nは中心軸c上の屈折率、gは屈
折率分布定数を示し、Zは光伝送部104の長さ、r1
は光伝送部104の軸線方向一端面への光線Pの入射位
置と中心軸cとの距離、θ1は光伝送部104の軸線方
向一端面への光線Pの入射角度(rad)、r2は光伝
送部104の軸線方向他端面からの光線Pの出射位置と
中心軸cとの距離、θ2は光伝送部104の軸線方向他
端面からの光線Pの出射角度(rad)を表す(図3参
照)。
Here, n is the refractive index on the central axis c, g is the refractive index distribution constant, Z is the length of the optical transmission section 104, and r1
Is the distance between the central axis c and the incident position of the light beam P on the one end face in the axial direction of the light transmission unit 104, θ1 is the incident angle (rad) of the light beam P on the one end face in the axial direction of the light transmission unit 104, and r2 is the light The distance between the center axis c and the emission position of the light beam P from the other axial end face of the transmission unit 104, θ2 represents the emission angle (rad) of the light beam P from the other axial end face of the optical transmission unit 104 (see FIG. 3). ).

【0028】上記(2)式から、出射端面(他端面)で
の光線の出射位置は、屈折率分布定数gと屈折率nに応
じて変化することがわかる。この結果、図2に示されて
いるように、光伝送部104の一端面の同一入射位置
(半径方向位置)rから複数の異なった波長λ1、λ2
を含む波長多重光114が入射したときには、各波長に
対する屈折率分布定数gと屈折率nとが異なるため、光
伝送部104の他端面での各光線116、118の出射
位置と中心軸cとの距離r21、r22が異なる。
From the above equation (2), it can be seen that the exit position of the light beam on the exit end face (the other end face) changes depending on the refractive index distribution constant g and the refractive index n. As a result, as shown in FIG. 2, a plurality of different wavelengths λ1 and λ2 from the same incident position (radial position) r on the one end surface of the optical transmission unit 104.
When the wavelength-multiplexed light 114 including the light enters, since the refractive index distribution constant g and the refractive index n for each wavelength are different, the emission positions of the light beams 116 and 118 on the other end surface of the optical transmission unit 104 and the central axis c. The distances r21 and r22 are different.

【0029】本実施例では、上記温度条件では、λ1=
1285.4nmの単色光はr21=0.01mm、λ
2=152.6nmの単色光はr22=0.00mmの
位置から出射し、λ2の単色光118が出射側光ファイ
バ110に入射する。
In this embodiment, under the above temperature conditions, λ1 =
1285.4 nm monochromatic light is r21 = 0.01 mm, λ
The monochromatic light of 2 = 152.6 nm is emitted from the position of r22 = 0.00 mm, and the monochromatic light 118 of λ2 is incident on the emission side optical fiber 110.

【0030】図4は、屈折率分布側の光伝送部104の
屈折率分布の温度依存性を示すグラフである。図4に示
されているように、本実施例の光伝送部104の屈折率
分布定数の温度依存性の係数は、6.0×10-5/℃で
ある。従って、光伝送部104の温度を70℃に設定す
ると、波長λ1、λ2の光線に対する屈折率分布定数
は、それぞれ、g1=0.540、g2=0.537と
なり、波長λ1、λ2の光線の出射位置と中心軸cとの
距離は、r21=0.00mm、r22=−0.01m
mに変化する。この結果、出射側光ファイバ110に入
射する光は、光伝送部104の温度が20℃の場合の波
長λ2の単色光から、λ1の単色光に切り替わることに
なる。このように、温度調節器112によって、光伝送
部104の温度を変化させることで、取り出すことがで
きる光の波長を変更することができる。
FIG. 4 is a graph showing the temperature dependence of the refractive index distribution of the optical transmission section 104 on the refractive index distribution side. As shown in FIG. 4, the coefficient of the temperature dependence of the refractive index distribution constant of the optical transmission unit 104 of this example is 6.0 × 10 −5 / ° C. Therefore, when the temperature of the optical transmission unit 104 is set to 70 ° C., the refractive index distribution constants for the light beams of wavelengths λ1 and λ2 are g1 = 0.540 and g2 = 0.537, respectively, and the light beams of wavelengths λ1 and λ2 are The distance between the emission position and the central axis c is r21 = 0.00 mm, r22 = -0.01 m.
change to m. As a result, the light incident on the emission side optical fiber 110 is switched from the monochromatic light having the wavelength λ2 when the temperature of the optical transmission unit 104 is 20 ° C. to the monochromatic light having the wavelength λ1. In this way, the wavelength of the light that can be extracted can be changed by changing the temperature of the optical transmission unit 104 by the temperature controller 112.

【0031】[0031]

【発明の効果】以上のように、本発明によれば、製作が
容易であり且つ取り出すことができる単色光の波長を変
更することができる光フィルタが提供される。
As described above, according to the present invention, there is provided an optical filter which is easy to manufacture and can change the wavelength of monochromatic light that can be extracted.

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

【図1】本発明の実施形態の光フィルタの構成を示す概
略的な斜視図である。
FIG. 1 is a schematic perspective view showing a configuration of an optical filter according to an embodiment of the present invention.

【図2】本発明の実施例の光フィルタの構成、作用を示
す概略的な側面図である。
FIG. 2 is a schematic side view showing the configuration and action of the optical filter of the embodiment of the present invention.

【図3】本発明の実施例の光フィルタの原理を説明する
ための図面である。
FIG. 3 is a drawing for explaining the principle of the optical filter according to the embodiment of the present invention.

【図4】本発明の実施例の伝送部の屈折率分布の温度依
存性を示すグラフである。
FIG. 4 is a graph showing the temperature dependence of the refractive index distribution of the transmission section of the example of the present invention.

【符号の説明】[Explanation of symbols]

1:光フィルタ 2:基板 4:光伝送部 6:入射側光ファイバ 10:出射側光ファイバ 12:温度調整器 14:波長多重光 16、18、20:単色光 1: Optical filter 2: substrate 4: Optical transmission unit 6: Optical fiber on incident side 10: Output side optical fiber 12: Temperature controller 14: WDM light 16, 18, 20: Monochromatic light

フロントページの続き (72)発明者 魚津 吉弘 広島県大竹市御幸町20番1号 三菱レイヨ ン株式会社中央技術研究所内 Fターム(参考) 2H079 AA06 AA12 BA04 CA05 CA07 DA07 EA03 EA09 EA32 EB27 HA07 2K002 AB04 AB07 AB40 BA13 CA06 DA06 DA10 HA11 Continued front page    (72) Inventor Yoshihiro Uozu             20-1 Miyuki-cho, Otake-shi, Hiroshima Mitsubishi Rayo             Central Technology Research Institute F-term (reference) 2H079 AA06 AA12 BA04 CA05 CA07                       DA07 EA03 EA09 EA32 EB27                       HA07                 2K002 AB04 AB07 AB40 BA13 CA06                       DA06 DA10 HA11

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 中心から外周部に向かって屈折率が連続
的に減少し、且つ、該屈折率の分布定数が温度により変
化する屈折率分布型の光伝送部と、 前記光伝送部の軸線方向一端側に設けられた波長多重光
用接続部と、 前記光伝送部の軸線方向他端側に設けられた単色光用接
続部と、 前記光伝送部の温度を変化させ、前記波長多重光用接続
部から前記光伝送部に入射した波長多重光に含まれる単
色光の前記光伝送部からの出射位置を変化させ、該単色
光の何れかを選択的に前記単色光用接続部に入射させる
温度変更手段と、を備えている、 ことを特徴とする光フィルタ。
1. A refractive index distribution type optical transmission part in which the refractive index continuously decreases from the center toward the outer peripheral part, and the distribution constant of the refractive index changes with temperature, and an axis line of the optical transmission part. The wavelength-multiplexed light connection part provided on one end side in the direction, the monochromatic light connection part provided on the other end side in the axial direction of the light transmission part, and the wavelength-multiplexed light change temperature of the light transmission part. For changing the output position of the monochromatic light included in the wavelength-multiplexed light incident on the optical transmission unit from the optical transmission unit, and selectively inputting any one of the monochromatic light to the monochromatic light connection unit. An optical filter comprising: a temperature changing means for controlling the temperature.
【請求項2】 前記光伝送部がプラスチックでできてい
る、 請求項1に記載の光フィルタ。
2. The optical filter according to claim 1, wherein the optical transmission section is made of plastic.
【請求項3】 前記光伝送部が略円筒体であり、 前記波長多重光用接続部が、前記光伝送部の軸線と平行
に、前記光伝送部に接続されている、 請求項1または2に記載の光フィルタ。
3. The optical transmission section is a substantially cylindrical body, and the wavelength division multiplexed light connection section is connected to the optical transmission section parallel to an axis of the optical transmission section. The optical filter described in.
【請求項4】 中心から外周部に向かって屈折率が連続
的に減少し、且つ、該屈折率が温度により変化する屈折
率分布型の光伝送部と、 前記光伝送部の温度を変化させる温度変更手段と、を備
えている、 ことを特徴とする光フィルタ。
4. A refractive index distribution type optical transmission section in which the refractive index continuously decreases from the center toward the outer peripheral section and the refractive index changes with temperature, and the temperature of the optical transmission section is changed. An optical filter comprising: a temperature changing unit.
JP2002063360A 2001-11-01 2002-03-08 Optical filter Expired - Fee Related JP3860052B2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP2002063360A JP3860052B2 (en) 2002-03-08 2002-03-08 Optical filter
PCT/JP2002/011156 WO2003038499A1 (en) 2001-11-01 2002-10-28 Optical multiplexer/demultiplexer, optical multiplexing/demultiplexing method, and optical filter
EP02775405A EP1447692A4 (en) 2001-11-01 2002-10-28 Optical multiplexer/demultiplexer, optical multiplexing/demultiplexing method, and optical filter
CNB028214439A CN1307447C (en) 2001-11-01 2002-10-28 Optical multi/demultiplexer, optical multi/demultiplexing method, and optical filter
US10/835,333 US7043113B2 (en) 2001-11-01 2004-04-30 Optical multi/demultiplexer, optical multi/demultiplexing method, and optical filter
US10/995,350 US20050094935A1 (en) 2001-11-01 2004-11-24 Optical multi/demultiplexer, optical multi/demultiplexing method, and optical filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002063360A JP3860052B2 (en) 2002-03-08 2002-03-08 Optical filter

Publications (3)

Publication Number Publication Date
JP2003262894A true JP2003262894A (en) 2003-09-19
JP2003262894A5 JP2003262894A5 (en) 2005-09-02
JP3860052B2 JP3860052B2 (en) 2006-12-20

Family

ID=29196665

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Country Status (1)

Country Link
JP (1) JP3860052B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005182008A (en) * 2003-12-01 2005-07-07 Fujitsu Ltd Tunable microlens array

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005182008A (en) * 2003-12-01 2005-07-07 Fujitsu Ltd Tunable microlens array

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