JPH0754364B2 - Optical fixed attenuator - Google Patents
Optical fixed attenuatorInfo
- Publication number
- JPH0754364B2 JPH0754364B2 JP60169185A JP16918585A JPH0754364B2 JP H0754364 B2 JPH0754364 B2 JP H0754364B2 JP 60169185 A JP60169185 A JP 60169185A JP 16918585 A JP16918585 A JP 16918585A JP H0754364 B2 JPH0754364 B2 JP H0754364B2
- Authority
- JP
- Japan
- Prior art keywords
- optical
- film
- attenuator
- multilayer film
- fixed
- 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 - Fee Related
Links
Landscapes
- Light Guides In General And Applications Therefor (AREA)
- Optical Elements Other Than Lenses (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Description
【発明の詳細な説明】 〔槻要〕 光ファイバの端面に光減衰膜を蒸着して形成した光固定
減衰器の光路上に誘電体多層膜を設けたので、誘電体多
層膜の減衰波長特性によって光減衰膜の減衰の波長依存
性を任意に補償した光固定減衰器が実現される。DETAILED DESCRIPTION [Summary] Since the dielectric multilayer film is provided on the optical path of the optical fixed attenuator formed by vapor-depositing the optical attenuation film on the end surface of the optical fiber, the attenuation wavelength characteristic of the dielectric multilayer film is provided. This realizes an optical fixed attenuator in which the wavelength dependence of the attenuation of the optical attenuating film is arbitrarily compensated.
本発明は固定減衰器に係り、特に減衰の波長特性を任意
に補償した光固定減衰器に関するものある。The present invention relates to a fixed attenuator, and more particularly to an optical fixed attenuator in which attenuation wavelength characteristics are arbitrarily compensated.
光固定減衰器は光ファイバにおける伝搬光に対して一定
の減衰を与えることによって、人力光または出力光のレ
ベルを調整する目的に用いられるものであり、広い波長
範囲の光に対してなるべく一定の減衰を与えることがで
きるものであることが要望される。The optical fixed attenuator is used for adjusting the level of human-power light or output light by giving a constant attenuation to the propagating light in the optical fiber. It is desired to be able to provide damping.
従来、光固定減衰器としては第５図に示されるようなも
のが使用されている。第５図において１は光固定減衰器
であって、光ファイバ２の一方の端面３の蒸着等の手段
によって例えばチタン（Ti）等からなる光減衰膜４を設
け、ハウジング５に封入したものである。このような光
固定減衰器を両端の光ファイバ6,7の間に挿入すること
によって、光ファイバ6,7の間で相互に伝送される光
に、光減衰膜４によって定まる一定の減衰を与えること
ができる。なお第５図に明らかなように光ファイバの各
端面は、光減衰膜４が設けられる箇所を含めて光ファイ
バ軸に対して斜めに形成されていて、端面間における多
重反射を防止するようになっている。Conventionally, a fixed optical attenuator as shown in FIG. 5 has been used. In FIG. 5, reference numeral 1 denotes a fixed optical attenuator, which is provided with a light attenuating film 4 made of, for example, titanium (Ti) by means of vapor deposition on one end face 3 of the optical fiber 2 and enclosed in a housing 5. is there. By inserting such an optical fixed attenuator between the optical fibers 6 and 7 at both ends, the light transmitted between the optical fibers 6 and 7 is given a certain attenuation determined by the optical attenuation film 4. be able to. As is apparent from FIG. 5, each end face of the optical fiber is formed obliquely with respect to the optical fiber axis, including the location where the light attenuation film 4 is provided, so as to prevent multiple reflection between the end faces. Has become.
しかしながら、一般に光減衰膜の減衰量は、第６図にそ
の一例を示すように波長によって変化し、長波長になる
につれて減衰量が低下する。例えば第６図は10dBの光固
定減衰器の例を示し、波長0.8μｍにおいて相対損失0dB
としたとき、波長1.3μｍにおいては約−0.5dBとなり、
その差は0.5dBとなって無視できない値となるが、従来
これに対する対策は行われていなった。However, generally, the attenuation amount of the optical attenuating film changes depending on the wavelength as shown in FIG. 6, and the attenuation amount decreases as the wavelength becomes longer. For example, Fig. 6 shows an example of a fixed optical attenuator of 10 dB, with a relative loss of 0 dB at a wavelength of 0.8 μm.
Then, at a wavelength of 1.3 μm, it becomes about −0.5 dB,
The difference is 0.5 dB, which is a non-negligible value, but conventionally no countermeasures have been taken.
本発明の目的は誘電体多層膜の減衰波長特性によって、
光減衰膜の特性に基づく光固定減衰器の減衰の延長依存
性を任意に補償することができる光固定減衰器を提供す
ることにある。The object of the present invention is to obtain the attenuation wavelength characteristics of the dielectric multilayer film,
An object of the present invention is to provide an optical fixed attenuator capable of arbitrarily compensating the extension dependence of the attenuation of the optical fixed attenuator based on the characteristics of the optical attenuating film.
本発明の構成は以下に示す通りである。即ち、光ファイ
バ（11）の端面に光減衰膜（12）を蒸着してなる光固定
減衰器において、前記光減衰膜（12）の波長特性を補償
する波長特性を有する誘電体多層膜（13）を該光固定減
衰器の光路上に設けたことを特徴とする光固定減衰器と
しての構成を有する。The structure of the present invention is as follows. That is, in a fixed optical attenuator formed by vapor-depositing a light attenuating film (12) on an end face of an optical fiber (11), a dielectric multilayer film (13) having a wavelength characteristic for compensating for the wavelength characteristic of the light attenuating film (12). ) Is provided on the optical path of the fixed optical attenuator, as a fixed optical attenuator.
或いはまた、前記誘電体多層膜（13）は、前記光ファイ
バ（11）の端面と対向する他の端面上に設けられたこと
を特徴とする光固定減衰器としての構成を有する。Alternatively, the dielectric multilayer film (13) is provided as an optical fixed attenuator, which is provided on the other end face of the optical fiber (11) that faces the end face.
或いはまた、前記誘電体多層膜（13）は、前記光減衰膜
（12）と積層して設けられたことを特徴とする光固定減
衰器としての構成を有する。Alternatively, the dielectric multilayer film (13) has a structure as an optical fixed attenuator characterized in that the dielectric multilayer film (13) is laminated on the optical attenuation film (12).
或いはまた、前記誘電体多層膜（13）は、前記光ファイ
バ（11）と光学的に結合する他の光ファイバ（15）の端
面上に設けられたことを特徴とする光固定減衰器として
の構成を有する。Alternatively, the dielectric multilayer film (13) is provided as an optical fixed attenuator, characterized in that it is provided on an end face of another optical fiber (15) optically coupled with the optical fiber (11). Have a configuration.
誘電体多層膜の減衰の波長特性を選択することによっ
て、光減衰膜の減衰波長特性に基づく光固定減衰器にお
ける減衰の波長依存性が任意に補償される。By selecting the attenuation wavelength characteristic of the dielectric multilayer film, the wavelength dependency of the attenuation in the optical fixed attenuator based on the attenuation wavelength characteristic of the optical attenuation film is arbitrarily compensated.
第１図は本発明の一実施例として光固定減衰器の構成を
示したものである。第１図において11は光ファイバであ
って、その一方の端面に光減衰膜12が設けられ、他方の
端面に光減衰膜12の特性補償用として誘電体多層膜から
なる光学多層膜13が設けられている。FIG. 1 shows the structure of an optical fixed attenuator as an embodiment of the present invention. In FIG. 1, reference numeral 11 denotes an optical fiber, one end face of which is provided with a light attenuating film 12, and the other end face thereof is provided with an optical multilayer film 13 composed of a dielectric multilayer film for compensating the characteristics of the light attenuating film 12. Has been.
第２図は光学多層膜13の特性の一例を示したものであっ
て、第６図に例示された特性を有する光固定減衰器に適
合した補償特性を有するものである。すなわち第２図か
ら明らかなように、その減衰特性は波長0.8μｍにおい
て損失0.013dB,波長1.3μｍにおいて0.5dBであって、そ
の差は0.5dBであり、従って第６図に示された特性の光
固定減衰器と組み合わせてこのような光学多層膜13を設
けて第１図に示した光固定減衰器の構成を実現したと
き、光減衰膜12の減衰の波長依存性を補償して平坦化さ
れた減衰特性を実現することができる。FIG. 2 shows an example of the characteristics of the optical multilayer film 13, which has a compensation characteristic suitable for the optical fixed attenuator having the characteristics illustrated in FIG. That is, as is clear from FIG. 2, the attenuation characteristic has a loss of 0.013 dB at a wavelength of 0.8 μm and a loss of 0.5 dB at a wavelength of 1.3 μm, and the difference is 0.5 dB. When the structure of the optical fixed attenuator shown in FIG. 1 is realized by providing such an optical multilayer film 13 in combination with the optical fixed attenuator, the wavelength dependence of the attenuation of the optical attenuating film 12 is compensated and flattened. It is possible to realize the attenuated characteristic.
第２図に示された特性例における光学多層膜13は４層の
構造をなすものであって、光ファイバ端面に近い側から
順次二酸化チタン（TiO2）膜，二酸化シリコン（SiO2）
膜，二酸化チタンおよび二酸化シリコン膜からなり、膜
厚はそれぞれ0.216,0.331,1.848,0.864である。ただし
膜厚はλ/4（λは中心波長であってλ＝0.8μｍ）を1.0
として表している。The optical multilayer film 13 in the characteristic example shown in FIG. 2 has a four-layer structure, and the titanium dioxide (TiO 2 ) film and the silicon dioxide (SiO 2 ) film are sequentially arranged from the side near the end face of the optical fiber.
It consists of a film, titanium dioxide and a silicon dioxide film, and the film thickness is 0.216, 0.331, 1.848, 0.864. However, the film thickness is λ / 4 (λ is the central wavelength and λ = 0.8 μm) is 1.0
It is expressed as.
光減衰膜の波長特性が異なる場合は、これに応じて特性
補償用光学多層膜13の層数やそれぞれの膜厚を選択する
ことによって、所望の減衰特性を有する光学多層膜13を
作成して組み合せることによって、任意に補償を行うこ
とができる。When the wavelength characteristics of the optical attenuating film are different, the optical multilayer film 13 having desired attenuating characteristics is created by selecting the number of layers and the respective film thicknesses of the characteristic compensating optical multilayer film 13 according to the wavelength characteristics. By combining them, compensation can be performed arbitrarily.
また補償の方法として、上述のように光減衰膜12の波長
特性と相殺して平坦な特性を実現する場合に限らず、補
償結果として任意の特性を得るようにすることもでき
る。The compensation method is not limited to the case of canceling the wavelength characteristic of the light attenuating film 12 to realize a flat characteristic as described above, and an arbitrary characteristic can be obtained as a compensation result.
第３図は本発明の第２の実施例としての光固定減衰器の
模式的構成図を示したものである。第１図に示された実
施例と異なり、特性補償用光学多層膜13と光減衰膜12と
は光ファイバ11の同一の端面上に重ね合せて設けられて
いるが、その作用、効果は第１図に示された実施例と同
様である。FIG. 3 shows a schematic configuration diagram of an optical fixed attenuator as a second embodiment of the present invention. Unlike the embodiment shown in FIG. 1, the characteristic compensating optical multilayer film 13 and the optical attenuating film 12 are provided so as to overlap each other on the same end face of the optical fiber 11. This is similar to the embodiment shown in FIG.
第４図は本発明の第３の実施例としての光固定減衰器の
模式的構成図を示したものである。この場合は特性補償
用光学多層膜13と光減衰膜12とはそれぞれ異なる光フィ
イバ14,15の端面に設けられており、両光ファイバ14,15
を突き合せて光学的に結合した状態で使用することによ
って、第１図に示された実施例と同様に作用，効果を生
じることができる。なお、第４図の実施例では、対向す
る光学多層膜13と光減衰膜12との間に光ファイバと同じ
屈折率を有するマッチングオイル16を介在させることに
よって、結合部における反射損失の発生を防止してい
る。FIG. 4 shows a schematic configuration diagram of an optical fixed attenuator as a third embodiment of the present invention. In this case, the characteristic compensating optical multilayer film 13 and the optical attenuating film 12 are provided on the end faces of different optical fibers 14 and 15, respectively.
When they are used in a state where they are butted against each other and are optically coupled, the same action and effect as those of the embodiment shown in FIG. 1 can be obtained. In the embodiment shown in FIG. 4, the matching oil 16 having the same refractive index as that of the optical fiber is interposed between the optical multilayer film 13 and the optical attenuating film 12 which are opposed to each other, so that the reflection loss at the coupling portion is prevented. To prevent.
以上説明したように本発明の光固定減衰器によれば、光
ファイバの端面に光減衰膜を蒸着して形成した光固定減
衰器におけるこの光ファイバの端面またはこの光ファイ
バと光学的に結合する他の光ファイバの端面に誘電体多
層膜を設けたので、誘電体多層膜の減衰波長特性によっ
て、光減衰膜の特性に基づく光固定減衰器の減衰の波長
依存性を任意に補償することができる。As described above, according to the optical fixed attenuator of the present invention, the optical fixed attenuator formed by depositing the optical attenuation film on the end surface of the optical fiber is optically coupled to the end surface of the optical fiber or the optical fiber. Since the dielectric multilayer film is provided on the end face of another optical fiber, the wavelength dependence of the attenuation of the optical fixed attenuator based on the characteristics of the optical attenuation film can be arbitrarily compensated by the attenuation wavelength characteristic of the dielectric multilayer film. it can.
第１図は本発明の第１の実施例としての光固定減衰器の
模式的構成を示す図、 第２図は特性補償用光学多層膜の特性の一例を示す図、 第３図及び第４図はそれぞれ本発明の第２及び第３の実
施例として光固定減衰器の模式的構成を示す図、 第５図は従来の光固定減衰器の模式的構成を示す図、 第６図は従来の10dB光固定減衰器の特性の一例を示す図
である。 １……光固定減衰器 2,6,7,11,14,15……光ファイバ、 ３……端面 4,12……光減衰膜、 ５……ハウジング 13……（特性補償用）光学多層膜（誘電体多層膜） 16……マッチングオイルFIG. 1 is a diagram showing a schematic configuration of an optical fixed attenuator as a first embodiment of the present invention, FIG. 2 is a diagram showing an example of characteristics of an optical multilayer film for characteristic compensation, FIGS. 3 and 4 FIG. 5 is a diagram showing a schematic configuration of a fixed optical attenuator as the second and third embodiments of the present invention, FIG. 5 is a diagram showing a schematic configuration of a conventional fixed optical attenuator, and FIG. FIG. 7 is a diagram showing an example of characteristics of the 10 dB fixed optical attenuator. 1 …… Optical fixed attenuator 2,6,7,11,14,15 …… Optical fiber, 3 …… End face 4,12 …… Optical attenuation film, 5 …… Housing 13 …… (for characteristic compensation) Optical multilayer Film (dielectric multilayer film) 16 ... Matching oil
Claims (4)
る光固定減衰器において、前記光減衰膜の波長特性を補
償する波長特性を有する誘電体多層膜を該光固定減衰器
の光路上に設けたことを特徴とする光固定減衰器。1. A fixed optical attenuator formed by vapor-depositing a light attenuating film on an end face of an optical fiber, wherein a dielectric multilayer film having a wavelength characteristic for compensating for the wavelength characteristic of the optical attenuating film is provided in the fixed optical attenuator. An optical fixed attenuator provided on the road.
面と対向する他の端面上に設けられたことを特徴とする
請求項１記載の光固定減衰器。2. The optical fixed attenuator according to claim 1, wherein the dielectric multilayer film is provided on another end surface of the optical fiber which faces the end surface of the optical fiber.
して設けられたことを特徴とする請求項１記載の光固定
減衰器。3. The optical fixed attenuator according to claim 1, wherein the dielectric multilayer film is provided so as to be laminated with the optical attenuation film.
学的に結合する他の光ファイバの端面上に設けられたこ
とを特徴とする請求項１記載の光固定減衰器。4. The optical fixed attenuator according to claim 1, wherein the dielectric multilayer film is provided on an end face of another optical fiber optically coupled to the optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60169185A JPH0754364B2 (en) | 1985-07-31 | 1985-07-31 | Optical fixed attenuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60169185A JPH0754364B2 (en) | 1985-07-31 | 1985-07-31 | Optical fixed attenuator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6230203A JPS6230203A (en) | 1987-02-09 |
| JPH0754364B2 true JPH0754364B2 (en) | 1995-06-07 |
Family
ID=15881809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60169185A Expired - Fee Related JPH0754364B2 (en) | 1985-07-31 | 1985-07-31 | Optical fixed attenuator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0754364B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2560058Y2 (en) * | 1988-03-31 | 1998-01-21 | 京セラ株式会社 | Optical fixed attenuator |
| JP3098487B2 (en) | 1998-01-29 | 2000-10-16 | 日本電気株式会社 | Optical cable introduction structure and optical cable introduction connection method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5744110A (en) * | 1980-08-29 | 1982-03-12 | Fujitsu Ltd | Polarizer |
| JPS5855903A (en) * | 1981-09-29 | 1983-04-02 | Fujitsu Ltd | Production of optical attenuator |
-
1985
- 1985-07-31 JP JP60169185A patent/JPH0754364B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6230203A (en) | 1987-02-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |