JPS6247607A - Optical fiber type polarizer - Google Patents
Optical fiber type polarizerInfo
- Publication number
- JPS6247607A JPS6247607A JP60187746A JP18774685A JPS6247607A JP S6247607 A JPS6247607 A JP S6247607A JP 60187746 A JP60187746 A JP 60187746A JP 18774685 A JP18774685 A JP 18774685A JP S6247607 A JPS6247607 A JP S6247607A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- polarized wave
- refractive index
- small
- core
- 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
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/105—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type having optical polarisation effects
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
Description
【発明の詳細な説明】 ［発明の対象］ 本発明は光ファイバ型偏光子に関するものでおる。[Detailed description of the invention] [Subject of invention] The present invention relates to an optical fiber type polarizer.
［従来技術］
従来の偏光子としては、フィルム状の偏光子やプリズム
型偏光子が用いられているが、フィルム状のものは一般
に消光比約−４０ｄＢ程度と特性があまり良くない。[Prior Art] Film-shaped polarizers and prism-type polarizers are used as conventional polarizers, but film-shaped ones generally have an extinction ratio of about -40 dB, which is not very good.
プリズム型偏光子は、価格が高いうえ、光学接着剤で貼
合せているため湿気等の環境条件に注意を要する等の問
題がある。Prism-type polarizers are expensive and have problems such as the need to be careful about environmental conditions such as humidity because they are bonded together using an optical adhesive.
また、光ファイバ相互の間に偏光子を挿入配置する場合
、一旦光ファイバからの出射光をレンズ等を用いて平行
光とする必要がおり、装置全体として複雑でおり、軸合
ぜが難しい等の問題もある。In addition, when inserting a polarizer between optical fibers, it is necessary to convert the light emitted from the optical fibers into parallel light using a lens, etc., which makes the entire device complicated and difficult to align the axes. There is also the problem of
［発明の目的コ
本発明は斯かる状況に鑑み、低価格で、特性特に消化比
が良好で、取扱いやすい偏光子を提供することを目的と
する。[Purpose of the Invention] In view of the above circumstances, the object of the present invention is to provide a polarizer that is low in price, has good characteristics, especially the digestion ratio, and is easy to handle.
［発明の概要］
本発明は、固有偏光軸入射波のカットオフ波長に大きな
差異を有する偏波面保存光ファイバを用いて、この光フ
ァイバに曲げを印加した光ファイバ型偏光子で必って、
これによって前記目的を達成するものでおる。[Summary of the Invention] The present invention uses a polarization-maintaining optical fiber having a large difference in the cutoff wavelength of the incident wave on the eigenpolarization axis, and is an optical fiber type polarizer in which bending is applied to this optical fiber.
This achieves the above objective.
［実施例コ
本発明の構成を、実施例に添って図面を参照して具体的
に説明する。[Embodiments] The structure of the present invention will be specifically explained in accordance with embodiments with reference to the drawings.
偏波面保存光ファイバには２つの固有偏光軸がおり、各
固有（偏光軸入射波すなわちＸ偏波、ｙｔ喝波のカット
オフ波長に差異がある。A polarization-maintaining optical fiber has two unique polarization axes, and each unique (polarization axis incident wave, that is, the cutoff wavelength of the X polarization wave and the YT pulse wave) is different.
この−例を第１図に示すが、この例ではＸ偏波のカット
オフ波長か約１．２２μｍ、Ｘ偏波のカットオフ波長が
約１．０５μｍである。An example of this is shown in FIG. 1, where the cutoff wavelength of the X-polarized wave is approximately 1.22 μm, and the cutoff wavelength of the X-polarized wave is approximately 1.05 μm.
このような値波面保存光ファイバに曲げを与えると、カ
ットオフ波長が短波よりにあるものほど長波長帯での電
磁界の閉じ込めか弱いため、曲げ損失が大きくなる。When such a wavefront preserving optical fiber is bent, the bending loss increases as the cutoff wavelength is closer to the short wavelength because the confinement of the electromagnetic field in the longer wavelength band is weaker.
先の光ファイバを用いて、曲げ半径３０Ｍｒ１、巻回数
４０ターンとした時の損失波長特性を第２図に示す。FIG. 2 shows the loss wavelength characteristics using the above optical fiber with a bending radius of 30 Mr1 and a winding number of 40 turns.
第２図から明らかなように、ある特定の波長では一方の
固有偏光軸入射波は低損失であるものの、他方の固有偏
光軸入射波は高損失である。As is clear from FIG. 2, at a certain wavelength, the incident wave on one eigenpolarization axis has a low loss, but the incident wave on the other eigenpolarization axis has a high loss.
すなわち、Ｘ偏波が光ファイバの長手方向のゆらぎ等に
よって、そのパワーの一部がｙ軸方向に移向したとして
も、Ｘ偏波は極めて高損失なため移向したパワーは出射
端まで伝搬することなく消失する。In other words, even if part of the power of the X-polarized wave is shifted in the y-axis direction due to fluctuations in the longitudinal direction of the optical fiber, the shifted power will not propagate to the output end because the X-polarized wave has extremely high loss. Disappears without doing anything.
従って、この波長では、Ｘ偏波のみの絶対単一偏波とな
っており、高い消光比が期待できる。Therefore, at this wavelength, there is an absolutely single polarization of only the X polarization, and a high extinction ratio can be expected.
この例で、波長１．５２μｍで消光比を測定した結果−
６０ｄＢを確認することができた。In this example, the extinction ratio was measured at a wavelength of 1.52 μm -
I was able to confirm 60dB.
このような特性を実現する偏波保存光ファイバの例とし
て第３図に示す構造のものが使用できる。As an example of a polarization-maintaining optical fiber that achieves such characteristics, one having the structure shown in FIG. 3 can be used.
第３図において、１はコア、２はクラッド、３は楕円ジ
ャケットであり、４はサポートである。In FIG. 3, 1 is a core, 2 is a cladding, 3 is an oval jacket, and 4 is a support.
このような断面構造を有する楕円ジャケット型偏波面保
存光ファイバの屈折率分布は、Ｘ軸方向の分布とｙ軸方
向の分布とで相違がある。The refractive index distribution of an elliptical jacket type polarization maintaining optical fiber having such a cross-sectional structure is different between the distribution in the X-axis direction and the distribution in the y-axis direction.
すなわち、Ｘ軸方向に見たとき、第４図に示すように、
コア１の屈折率が大きく、楕円ジャケット３の屈折率は
小さく、クラッド２とサポート４の屈折率がこれらの中
間の値を示している。That is, when viewed in the X-axis direction, as shown in Figure 4,
The refractive index of the core 1 is large, the refractive index of the elliptical jacket 3 is small, and the refractive indices of the cladding 2 and the support 4 are intermediate values between these.
また、ｙ軸方向に見たとき、第５図に示すようにコア１
の屈折率のみが大きく、クラッド２、楕円ジャケット３
、サポート４の屈折率がみな一様に小さくなっている。Also, when viewed in the y-axis direction, core 1
Only the refractive index of is large, cladding 2, elliptical jacket 3
, the refractive index of the support 4 is uniformly small.
このような偏波面保存光ファイバをコイル状に形成する
ことにより、有効な光ファイバ型偏光子を得ることがで
きる。By forming such a polarization-maintaining optical fiber into a coil shape, an effective optical fiber type polarizer can be obtained.
なあ、楕円ジャケット型偏波面保存光ファイバの楕円率
ε（％）及び波長λ＝０．６３３μｍでの結合長（Ｌｍ
＞に対して、εＬ≧５０を満足する構成のものが望まし
い。By the way, the ellipticity ε (%) and the coupling length at wavelength λ = 0.633 μm (Lm
＞, it is desirable to have a configuration that satisfies εL≧50.
ざらに、２つの固有偏光軸入射波のカットオフ波長に大
きな差異を発生させるように、偏波面保存光ファイバに
含有させるＢの濃度を８モル％以上とするとよい。Roughly speaking, the concentration of B contained in the polarization maintaining optical fiber is preferably 8 mol % or more so as to generate a large difference in the cutoff wavelengths of the two eigenpolarization axis incident waves.
［発明の効果］
以上説明したような本発明の光ファイバ型幅光子でおれ
ば、次のような顕著な効果を奏する。[Effects of the Invention] The optical fiber type width photon of the present invention as described above provides the following remarkable effects.
（１）偏波面保存光ファイバのみで構成されている光フ
ァイバ型偏光子であるため、プリズム型偏光子に比較し
て低価格であり、かつ環境条件等の制約も少なく取扱い
やすい。(1) Since it is an optical fiber type polarizer composed only of polarization-maintaining optical fibers, it is less expensive than a prism type polarizer, and has fewer restrictions such as environmental conditions and is easier to handle.
（２）極めて高い消光比を（ｑるごとができ、偏光子と
しての特性が優れている。(2) It has an extremely high extinction ratio and has excellent properties as a polarizer.
（３）光ファイバと直接融着接続することもでき、シス
テムに組込むことが容易である。(3) It can also be directly fusion-spliced with optical fibers, making it easy to incorporate into a system.
第１図は偏波面保存光ファイバの各固有偏光軸入射波の
カットオフ波長の例を示す線図、第２図は偏波面保存光
ファイバをコイル状に形成したときの各固有偏光軸入射
波の損失波長特性を示す線図、第３図は楕円ジャケット
型偏波面保存光ファイバの一例を示す断面図であり、第
４図及び第５図は第３図の偏波面保存光ファイバの屈折
率分布を示す線図である。
１：コア、
２：クラッド、
３：楕円ジャケット、
４：サポート。
代理人 弁理士 佐 藤 不二雄
項夫 （、：ｔｆ３）
頂 矢 （ｍｌFigure 1 is a diagram showing an example of the cutoff wavelength of each eigenpolarization axis incident wave of a polarization maintaining optical fiber, and Figure 2 is a diagram showing an example of the cutoff wavelength of each eigenpolarization axis incident wave when the polarization maintaining optical fiber is formed into a coil shape. Figure 3 is a cross-sectional diagram showing an example of an elliptical jacket type polarization-maintaining optical fiber, and Figures 4 and 5 show the refractive index of the polarization-maintaining optical fiber in Figure 3. It is a line diagram showing distribution. 1: core, 2: cladding, 3: oval jacket, 4: support. Agent: Patent Attorney Nobuo Sato Fujio (,:tf3) Ya Toya (ml
Claims (1)
偏光軸入射波は低損失であり、他方の固有偏光軸入射波
は高損失である偏波面保存光ファイバを用い、該偏波保
存光ファイバをコイル状に形成したことを特徴とする光
ファイバ型偏光子。(1) Using a polarization-maintaining optical fiber in which the incident wave on one eigenpolarization axis has low loss and the incident wave on the other eigenpolarization axis has high loss, at least in a limited wavelength range, An optical fiber type polarizer characterized by being formed into a coil shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60187746A JPH0762725B2 (en) | 1985-08-27 | 1985-08-27 | Optical fiber type polarizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60187746A JPH0762725B2 (en) | 1985-08-27 | 1985-08-27 | Optical fiber type polarizer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6247607A true JPS6247607A (en) | 1987-03-02 |
| JPH0762725B2 JPH0762725B2 (en) | 1995-07-05 |
Family
ID=16211471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60187746A Expired - Lifetime JPH0762725B2 (en) | 1985-08-27 | 1985-08-27 | Optical fiber type polarizer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0762725B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6338903A (en) * | 1986-08-04 | 1988-02-19 | Sumitomo Electric Ind Ltd | Fiber laser |
| JPH01250908A (en) * | 1987-12-09 | 1989-10-05 | Hitachi Cable Ltd | Optical transmission line for circularly polarized light |
| JPH0389305A (en) * | 1989-09-01 | 1991-04-15 | Japan Aviation Electron Ind Ltd | Optical fiber type phase element |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6017083A (en) * | 1983-07-11 | 1985-01-28 | Kawasaki Steel Corp | Enameled steel sheet |
-
1985
- 1985-08-27 JP JP60187746A patent/JPH0762725B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6017083A (en) * | 1983-07-11 | 1985-01-28 | Kawasaki Steel Corp | Enameled steel sheet |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6338903A (en) * | 1986-08-04 | 1988-02-19 | Sumitomo Electric Ind Ltd | Fiber laser |
| JPH01250908A (en) * | 1987-12-09 | 1989-10-05 | Hitachi Cable Ltd | Optical transmission line for circularly polarized light |
| JPH0389305A (en) * | 1989-09-01 | 1991-04-15 | Japan Aviation Electron Ind Ltd | Optical fiber type phase element |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0762725B2 (en) | 1995-07-05 |
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