JPS6275502A - Optical multiplexer/demultiplexer - Google Patents

Abstract

PURPOSE:To reduce a deviation of an optical axis from a collimeter and to reduce a coupling loss by inserting an intermediate material having an intermediate coefficient of thermal expansion between that of a base plate and a glass body into a space between the base plate and the glass body and integrally fixing these members. CONSTITUTION:The glass body 6 is fixed to the base plate 5 through the intermediate material 9 with the inclination of a fixed angle from collimeters 1a-1c and has three smooth surfaces consisting of the 1st and 2nd surfaces 6a, 6b and the 3rd surface 6c rectangular to the 1st and 2nd surfaces 6a, 6b. Plural interference filters 7a, 7b having different wavelength passing areas respectively are arranged on the 1st surface 6a in parallel and oppositely so that the collimeters 1b, 1c coincide with respective optical axes. The intermediate material 9 is a substance having the intermediate coefficient of thermal expansion between that of the base plate 5 and the glass body 6 and made of an iron plate e.g. and it is preferable to use a substance having the coefficient of thermal expansion closer to that of the glass body 6 than that of the base plate 5.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、コリメータを用いた光合分波器に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to an optical multiplexer/demultiplexer using a collimator.

〔従来の技術〕[Conventional technology]

従来の光合分波器を第３図および第４図に従って説明す
る。A conventional optical multiplexer/demultiplexer will be explained with reference to FIGS. 3 and 4.

第３図は平面図、第４図は側面図であり、図にオイテ１
　ａ　、　　１　ｂ　、　　１　ｃはコリメータであり
、光ファイバ２ａ、２ｂ、２ｃと集束性ロッドレンズ３
ａ、３ｂ、３ｃを一体にして形成してあり、それぞれス
ペーサ４ａ、４ｂ、４ｃを介して平行に基板５に固定さ
れていて平行ビームを作成するようになっている。Figure 3 is a plan view and Figure 4 is a side view.
a, 1b, 1c are collimators, and optical fibers 2a, 2b, 2c and a focusing rod lens 3
a, 3b, and 3c are integrally formed, and are fixed to the substrate 5 in parallel via spacers 4a, 4b, and 4c, respectively, to create a parallel beam.

６は上記コリメータＩａ、１ｂ、１ｃに対して一定角度
に傾けて基板５に固定したガラス体であり、コリメータ
１ａ、１ｂ、１ｃに対向する平行な第１面５ａ、第２面
６ｂと、この第１．第２の両面６ａ、６ｂに直交する第
３面６ｃの３つの平滑面より成り、上記第１面６ａには
異なった波長通過域を持つ複数の干渉膜フィルタ７ａ、
７ｂが並列に配列されてそれぞれの干渉膜フィルタ７ａ
。A glass body 6 is fixed to the substrate 5 at a fixed angle with respect to the collimators Ia, 1b, and 1c, and has a parallel first surface 5a and a second surface 6b facing the collimators 1a, 1b, and 1c. 1st. It consists of three smooth surfaces, a third surface 6c orthogonal to the second surfaces 6a and 6b, and the first surface 6a has a plurality of interference film filters 7a having different wavelength passbands,
7b are arranged in parallel to form respective interference film filters 7a.
.

７ｂは上記コリメータ１ｂ、１ｃと光軸が一致するよう
に対向位置に配置されている。この第１面６ａに平行な
第２面６ｂには反射ミラー８が取付けである。7b is disposed at a position facing the collimators 1b and 1c so that their optical axes coincide with each other. A reflecting mirror 8 is attached to a second surface 6b parallel to the first surface 6a.

以上の構成によると、共通ポートであるコリメータ１ａ
を経た光はガラス体６に第１而６ａから入光し、この光
は第３面６ｃで全反射し、さらに第２面６ｂでは反射ミ
ラー８によって全反射して干渉膜フィルタ７ａに照射さ
れる。According to the above configuration, the collimator 1a which is the common port
The light enters the glass body 6 from the first surface 6a, is totally reflected on the third surface 6c, is further totally reflected on the second surface 6b by the reflection mirror 8, and is irradiated onto the interference film filter 7a. Ru.

この干渉膜フィルタ７ａでは、この干渉膜フィルタ７ａ
を通過できる波長の光のみが通過してコツメータ１ｂに
入光結合される。In this interference film filter 7a, this interference film filter 7a
Only light having a wavelength that can pass through the sensor 1b passes through and is coupled into the cot meter 1b.

従ってその他の波長の光はこの干渉膜フィルタ７ａを反
射し、さらに反射ミラー８で再び反射して次の干渉膜フ
ィルタ７ｂに照射まれでコリメータ１ｃに結合される。Therefore, light of other wavelengths is reflected by this interference film filter 7a, further reflected again by the reflection mirror 8, and irradiated onto the next interference film filter 7b, whereupon it is coupled to the collimator 1c.

以上のようにして光の分波作用が行なわれるが、光の送
路が逆の場合には光の合波作用が行なわれることになる
。　　　− 〔発明が解決しようとする問題点〕 以上のような従来の光合分波器によると、コリメータ１
ａ、１ｂ、ｉｃおよびガラス体６の相対的な位置ずれが
光の結合損失となって大きく現われてくる。The light demultiplexing action is performed as described above, but when the light transmission path is reversed, the light multiplexing action is performed. - [Problems to be solved by the invention] According to the conventional optical multiplexer/demultiplexer as described above, the collimator 1
The relative positional deviation of a, 1b, ic, and the glass body 6 becomes a large coupling loss of light.

特に基板５とガラス体６との熱膨張係数の差異により、
温度変化があると反りや位置ずれまたははがれが生じる
と云う問題がある。In particular, due to the difference in thermal expansion coefficient between the substrate 5 and the glass body 6,
There is a problem in that temperature changes can cause warping, misalignment, or peeling.

上記の如くガラス体６内を光が複数回反射すると、ガラ
ス体６の微小な動きでも光軸のずれが反射する毎に拡大
されて最終的には非常に大きな損失となって現われる問
題がある。When light is reflected multiple times within the glass body 6 as described above, there is a problem in that even the slightest movement of the glass body 6 causes the deviation of the optical axis to be magnified each time it is reflected, resulting in a very large loss in the end. .

〔問題点を解決するための手段〕[Means for solving problems]

本発明は、基板に取付けた平行ビームを作成するコリメ
ータと、このコリメータに光軸が一致するように上記基
板に取付けた合波・分波機能を有するガラス魁よ構成る
光合分波器において、ガラス体と基板との間にガラス体
の熱膨張係数と基板の熱膨張係数との中間の熱膨張係数
を有する中間材を介在させて全一体に固定したことを特
徴とする。The present invention provides an optical multiplexer/demultiplexer comprising a collimator attached to a substrate to create a parallel beam, and a glass pipe having a multiplexing/demultiplexing function attached to the substrate so that the optical axis coincides with the collimator. It is characterized in that an intermediate material having a coefficient of thermal expansion intermediate between the coefficient of thermal expansion of the glass body and the coefficient of thermal expansion of the substrate is interposed between the glass body and the substrate so that the glass body and the substrate are fixed integrally.

〔作用〕[Effect]

以上の構成によると、温度変化にょシガラス体と基板と
に生ずる膨張変化はそれぞれ中間材との接合面で応力が
作用することにより基板の熱膨張変化が直接ガラス体に
伝わらず反りゃ立置ずれが緩和されてコリメータに対す
る光軸のずれが少なぐなって結合損失が小さくなる。According to the above configuration, the thermal expansion changes that occur in the glass body and the substrate due to temperature changes are caused by stress acting on the joint surface with the intermediate material, so that the thermal expansion change of the substrate is not directly transmitted to the glass body, and if it warps, it may cause vertical misalignment. is relaxed, the deviation of the optical axis with respect to the collimator is reduced, and the coupling loss is reduced.

〔実施例〕〔Example〕

以下に本発明の実施例を図面に従って説明する。 Embodiments of the present invention will be described below with reference to the drawings.

第１図は平面図、第２図は側面図である。なお、以下の
説明において上記従来技術と同一部位については同一符
号で説明する。FIG. 1 is a plan view, and FIG. 2 is a side view. In the following description, parts that are the same as those in the prior art described above will be described using the same reference numerals.

図において１ａ、　　１ｂ、１ｃはコリメータであり、
光ファイバ２ａ、２ｂ、２ｃと集束性ロッドレンズ３ａ
、３ｂ、３ｃを一体にして形成してあり、それぞれスペ
ーサ４ａ、４ｂ、４ｃを介して平行に基板５に固定され
て平行ビームを作成するようになっている。In the figure, 1a, 1b, and 1c are collimators,
Optical fibers 2a, 2b, 2c and focusing rod lens 3a
, 3b, and 3c are integrally formed, and are fixed to the substrate 5 in parallel via spacers 4a, 4b, and 4c, respectively, to create a parallel beam.

上記基板５は一般に黄銅やアルミニウムによって製造さ
れている。The substrate 5 is generally made of brass or aluminum.

６は上記コリメータＩａ、Ｉｂ、１ｃに対して一定角度
に傾けて中間材９を介して基板５に固定したガラス体で
ちり、コリメータ１ａ、１ｂ、１ｃに対向する平行な第
１面５ａＸ第２面６ｂと、この第】、第２両面［５ａ、
５ｂに直交する第３面６ｃの３つの平滑面より成り、上
記第１面６ａには異なつだ波長通過域を持つ複数の干渉
膜フィルタ７ａ。Reference numeral 6 denotes a glass body which is tilted at a certain angle with respect to the collimators Ia, Ib, and 1c and fixed to the substrate 5 via an intermediate material 9, and has a first surface 5a and a second parallel surface facing the collimators 1a, 1b, and 1c. surface 6b, this second surface [5a,
The first surface 6a includes a plurality of interference film filters 7a having different wavelength passbands.

７ｂが並列に配列されてそれぞれの干渉膜フィルタγａ
、γｂは上記コリメータ１ｂ、１ｃと光軸が一致するよ
うに対向位置に配置されている。この第１面６ａに平行
な第２面６ｂには反射ミラー８が取付けである。7b are arranged in parallel and each interference film filter γa
, γb are arranged at opposing positions so that their optical axes coincide with the collimators 1b and 1c. A reflecting mirror 8 is attached to a second surface 6b parallel to the first surface 6a.

上記中間材９は、基板５の熱膨張係数とガラス体６の熱
膨張係数との間にある熱膨張係数を有する物質であり例
えば鉄板などにより作られるもので、その物質を決める
場合、基板５の熱膨張係数よりガラス体６の熱膨張係数
に近い熱膨張係数値を有する物質を用いる方がよい。The intermediate material 9 is a material having a thermal expansion coefficient between that of the substrate 5 and that of the glass body 6, and is made of, for example, an iron plate. It is better to use a material having a coefficient of thermal expansion closer to that of the glass body 6 than that of the glass body 6 .

以上の構成によると、温度変化によシ基板５とガラス体
６とに生ずる膨張変化はそれぞれ中間材９との接合面で
応力が作用することにな９、基板５の熱膨張変化が直接
ガラス体６に伝わることが無くなり、ガラス体６の反り
や位置ずれが緩和されてコリメータ１ｂ、１ｃに対する
光軸のずれが少々くなる。According to the above configuration, the expansion changes that occur in the substrate 5 and the glass body 6 due to temperature changes are caused by stress acting on the joint surfaces with the intermediate material 9, respectively, and the thermal expansion changes of the substrate 5 are directly caused by the glass body The light is no longer transmitted to the glass body 6, the warpage and positional deviation of the glass body 6 are alleviated, and the deviation of the optical axis with respect to the collimators 1b and 1c is slightly reduced.

〔発明の効果〕〔Effect of the invention〕

以上詳細に説明した本発明によると、基板とガラス体と
の間に、基板とガラス体の中間の熱膨張係数を有する中
間材を入れて一体に固定したことによシ、温度変化に対
してガラス体と基板との間で熱応力が直接動らかず、中
間材との接合面でそれぞれの熱応力が作用することにな
シ、その結果ガラス体の反りや位置ずれが少なくなって
コリメータに対する光軸のずれは緩和されて結合損失が
小さくなる効果を有する。According to the present invention described in detail above, an intermediate material having a coefficient of thermal expansion between that of the substrate and the glass body is inserted between the substrate and the glass body and fixed together, thereby making it possible to resist temperature changes. Thermal stress does not move directly between the glass body and the substrate, and each thermal stress acts on the joint surface with the intermediate material, resulting in less warpage and misalignment of the glass body, and This has the effect of reducing the optical axis misalignment and reducing coupling loss.

また、熱応力の作用が少ないためにガラス体がはがれる
ようなこともなくなり信頼性の高い光合分波器となる効
果を有する。Furthermore, since the effect of thermal stress is small, the glass body does not peel off, resulting in a highly reliable optical multiplexer/demultiplexer.

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

第１図は本発明の一実施例を示す平面図、第２図は側面
図、第３図は従来例の平面図、第４図は側面図である。 Ｉａ、１ｂ、１ｃ・・・コリメータ　５・・・基板６・
・ガラス体　７ａ、　　γｂ・・・干渉膜フィルタ　８
・・・反射ミラー　９・・・中間材 本発明の一実施例の平面図 本発明の一実施例の側面図 輔　２　亘FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a side view, FIG. 3 is a plan view of a conventional example, and FIG. 4 is a side view. Ia, 1b, 1c... Collimator 5... Substrate 6.
・Glass body 7a, γb...Interference film filter 8
... Reflection mirror 9 ... Intermediate material Plan view of one embodiment of the present invention Side view of one embodiment of the present invention 2.

Claims (1)

【特許請求の範囲】 １、基板に取付けた平行ビームを作成するコリメータと
、このコリメータに光軸が一致するように上記基板に取
付けた合波・分波機能を有するガラス体とより成る光合
分波器において、 ガラス体と基板との間にガラス体の熱膨張係数と基板の
熱膨張係数との中間の熱膨張係数を有する中間材を介在
させて一体に固定したことを特徴とする光合分波器。[Claims] 1. Optical combining/splitting device consisting of a collimator attached to a substrate to create a parallel beam, and a glass body having a multiplexing/demultiplexing function attached to the substrate so that the optical axis coincides with the collimator. An optical combining device characterized in that a glass body and a substrate are fixed together by interposing an intermediate material having a thermal expansion coefficient intermediate between that of the glass body and that of the substrate. Wave equipment.