JPH04246615A - Optical isolator - Google Patents
Optical isolatorInfo
- Publication number
- JPH04246615A JPH04246615A JP3154791A JP3154791A JPH04246615A JP H04246615 A JPH04246615 A JP H04246615A JP 3154791 A JP3154791 A JP 3154791A JP 3154791 A JP3154791 A JP 3154791A JP H04246615 A JPH04246615 A JP H04246615A
- Authority
- JP
- Japan
- Prior art keywords
- fiber
- optical isolator
- polarizer
- lens
- permanent magnet
- 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
- 230000003287 optical effect Effects 0.000 title claims abstract description 49
- 239000000835 fiber Substances 0.000 claims abstract description 53
- 239000013078 crystal Substances 0.000 claims abstract description 15
- 230000010287 polarization Effects 0.000 claims abstract description 10
- 230000008878 coupling Effects 0.000 abstract description 6
- 238000010168 coupling process Methods 0.000 abstract description 6
- 238000005859 coupling reaction Methods 0.000 abstract description 6
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000002955 isolation Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 230000001902 propagating effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2746—Optical coupling means with polarisation selective and adjusting means comprising non-reciprocal devices, e.g. isolators, FRM, circulators, quasi-isolators
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は光通信などで使用する光
アイソレータに関するものである。更に詳しく述べると
、偏光子として楔形の一軸性単結晶を使用する偏光依存
性の無いファイバ入出力型光アイソレータに関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical isolator used in optical communications. More specifically, the present invention relates to a fiber input/output type optical isolator that uses a wedge-shaped uniaxial single crystal as a polarizer and has no polarization dependence.
【０００２】0002
【従来の技術】光通信において、レーザ光源への反射戻
り光を除去するために光アイソレータを使用している。
光アイソレータの形式は種々あるが、その一つに偏光子
として楔形のルチル単結晶等の一軸性単結晶（複屈折偏
光板）を使用し、偏光依存性を無くした入出力ファイバ
型光アイソレータがある。2. Description of the Related Art In optical communications, optical isolators are used to eliminate reflected light returning to a laser light source. There are various types of optical isolators, one of which is an input/output fiber type optical isolator that uses a uniaxial single crystal (birefringent polarizing plate) such as a wedge-shaped rutile single crystal as a polarizer and eliminates polarization dependence. be.
【０００３】その構成例を図２に示す。いずれも円筒状
の永久磁石１０内に４５度ファラデー回転子１２を装着
し、その両側にそれぞれ楔形の一軸性単結晶からなる偏
光子１４を、それらの光学軸が４５度食い違うように配
置する。更にその両側にレンズ１６とファイバ１８を配
置してファイバ入出力の偏光無依存形光アイソレータと
する。An example of its configuration is shown in FIG. In each case, a 45 degree Faraday rotator 12 is mounted inside a cylindrical permanent magnet 10, and polarizers 14 made of wedge-shaped uniaxial single crystals are arranged on both sides of the rotator 12 so that their optical axes are offset by 45 degrees. Furthermore, a lens 16 and a fiber 18 are arranged on both sides to form a polarization-independent optical isolator with fiber input and output.
【０００４】このような光アイソレータは、従来、次の
ような順序で組み立てている。
■永久磁石１０、ファラデー回転子１２、ともに楔形ル
チル単結晶からなる２個の偏光子１４により非相反素子
１５を組み立てる。２個のルチル単結晶は、図３に示す
ように、その光学軸（符号Ａで示す）が互いに４５度異
なる方向に配置して光アイソレータのアイソレーション
を最大にする。
■入出力ファイバ１８を光アイソレータ筐体（図示せず
）に固定する。
■レンズ１６の位置調整によって、順方向で光の通過量
が最大となるようにファイバ間の結合をとる。
■レンズ１６を光アイソレータ筐体に固定する。Conventionally, such an optical isolator is assembled in the following order. (2) A non-reciprocal element 15 is assembled with a permanent magnet 10, a Faraday rotator 12, and two polarizers 14, both of which are made of wedge-shaped rutile single crystal. As shown in FIG. 3, the two rutile single crystals are arranged so that their optical axes (indicated by symbol A) are 45 degrees different from each other to maximize the isolation of the optical isolator. (2) Fixing the input/output fiber 18 to an optical isolator housing (not shown). (2) Coupling between fibers is achieved by adjusting the position of the lens 16 so that the amount of light passing in the forward direction is maximized. ■Fix the lens 16 to the optical isolator housing.
【０００５】[0005]
【発明が解決しようとする課題】上記のような方法では
、非相反素子の組み立て及びファイバ間の結合を別々の
工程で行うため組立・調整工数が多くなる欠点がある。
具体的には、非相反素子１５の調整は図３の矢印Ｒで示
すように、一方の偏光子を他方の偏光子に対して相対的
に回転させて行い、ファイバ間の結合調整は両レンズに
ついて図２の座標Ｘ，Ｙ，Ｚで示すように３軸について
行う。このため組立・調整コストの上昇は避けられない
。The method described above has the disadvantage that the assembly and adjustment steps are increased because the assembly of the non-reciprocal element and the coupling between the fibers are performed in separate steps. Specifically, the adjustment of the non-reciprocal element 15 is performed by rotating one polarizer relative to the other polarizer, as shown by the arrow R in FIG. 3, and the coupling adjustment between the fibers is performed by rotating both lenses. The calculation is performed on three axes as shown by the coordinates X, Y, and Z in FIG. For this reason, an increase in assembly and adjustment costs is unavoidable.
【０００６】本発明の目的は、上記のような従来技術の
欠点を解消し、非相反素子の組み立て及びファイバ間の
結合を同時に行うことができ、組立・調整工数を低減し
て、より安価に容易に製作できる構造の光アイソレータ
を提供することである。An object of the present invention is to eliminate the drawbacks of the prior art as described above, to be able to assemble non-reciprocal elements and to couple between fibers at the same time, to reduce assembly and adjustment man-hours, and to achieve lower cost. An object of the present invention is to provide an optical isolator having a structure that can be easily manufactured.
【０００７】[0007]
【課題を解決するための手段】本発明は、円筒状の永久
磁石内にファラデー回転子を装着し、その両側にそれぞ
れ楔形の一軸性単結晶からなる偏光子を配置したファイ
バ入出力の偏光無依存形光アイソレータである。上記の
目的を達成するため本発明では、円筒状ホルダを用い、
その中にレンズを収容し、該円筒状ホルダの一端に偏光
子を装着すると共に他端からファイバ付きフェルールを
挿入して偏光子付きファイバコリメータとする。ファイ
バの端面はレンズの焦点距離に合わせる。そしてファラ
デー回転子を組み込んだ円筒状永久磁石と２組の前記偏
光子付きファイバコリメータを光アイソレータ筐体の円
形貫通孔に挿入し固定する。[Means for Solving the Problems] The present invention provides a fiber input/output without polarization, in which a Faraday rotator is mounted inside a cylindrical permanent magnet, and polarizers made of a wedge-shaped uniaxial single crystal are arranged on both sides of the rotator. It is a dependent type optical isolator. In order to achieve the above object, the present invention uses a cylindrical holder,
A lens is accommodated therein, a polarizer is attached to one end of the cylindrical holder, and a ferrule with a fiber is inserted from the other end to form a fiber collimator with a polarizer. The end face of the fiber is aligned with the focal length of the lens. Then, a cylindrical permanent magnet incorporating a Faraday rotator and the two sets of the fiber collimators with polarizers are inserted into the circular through hole of the optical isolator housing and fixed.
【０００８】ここで円筒状ホルダは内周面と外周面が十
分な同心度をもつようにし、その内径をフェルールの外
径に合致させる。また光アイソレータ筐体の円形貫通孔
は、その口径が前記円筒状ホルダ外径に合致するように
設計する。フェルール先端に位置するファイバ端面は斜
め研磨しておくことが望ましい。[0008] Here, the cylindrical holder is made so that its inner peripheral surface and outer peripheral surface have sufficient concentricity, and its inner diameter matches the outer diameter of the ferrule. Further, the circular through hole of the optical isolator housing is designed so that its diameter matches the outer diameter of the cylindrical holder. It is desirable that the fiber end face located at the tip of the ferrule be obliquely polished.
【０００９】[0009]
【作用】偏光子となる２個の一軸性単結晶の角度ずれは
順方向挿入損失には大きな影響を及ぼさないが、アイソ
レーションには大きく影響する。偏光子付きファイバコ
リメータを光アイソレータ筐体の円形貫通孔に挿入し、
円筒状ホルダに対してフェルールを相対的に回転・出入
させ順方向で光の通過量が最大となるように調整するこ
とでファイバ間の結合をとる。また光アイソレータ筐体
に対して円筒状ホルダを相対的に回転させアイソレーシ
ョンが最大となるように調整することで非相反素子部を
組み立てる。[Operation] Although the angular misalignment of the two uniaxial single crystals forming the polarizer does not have a large effect on the forward insertion loss, it does have a large effect on the isolation. Insert the fiber collimator with polarizer into the circular through hole of the optical isolator housing,
Coupling between fibers is achieved by rotating the ferrule relative to the cylindrical holder, moving it in and out, and adjusting it so that the amount of light passing through it is maximized in the forward direction. Further, the non-reciprocal element section is assembled by rotating the cylindrical holder relative to the optical isolator housing and adjusting it so that isolation is maximized.
【００１０】フェルール先端に位置するファイバ端面を
斜め研磨しておくと、非相反素子部内で空間伝播する光
路の中心軸からのずれを修正でき、且つ光アイソレータ
自体内での反射を低減できる。By obliquely polishing the fiber end face located at the tip of the ferrule, it is possible to correct the deviation from the central axis of the optical path spatially propagating within the non-reciprocal element portion, and to reduce reflection within the optical isolator itself.
【００１１】[0011]
【実施例】図１は本発明に係るファイバ入出力の偏光無
依存形光アイソレータの一実施例を示す断面図である。
基本的には、従来同様、円筒状の永久磁石１０内に磁気
光学結晶などからなる４５度ファラデー回転子１２を装
着し、その両側にそれぞれ楔形のルチル単結晶のような
一軸性単結晶（複屈折偏光板）からなる偏光子１４を、
それらの光学軸が互いに４５度食い違うように配置し、
両端にファイバ１８を設ける構成である。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional view showing an embodiment of a fiber input/output polarization-independent optical isolator according to the present invention. Basically, as in the past, a 45-degree Faraday rotator 12 made of a magneto-optic crystal is mounted inside a cylindrical permanent magnet 10, and a uniaxial single crystal (multiple crystal) such as a wedge-shaped rutile single crystal is attached to each side of the rotator 12. A polarizer 14 consisting of a refractive polarizing plate),
Arranged so that their optical axes are 45 degrees apart from each other,
The configuration is such that fibers 18 are provided at both ends.
【００１２】本実施例では内周面と外周面とが十分な同
心度をもつ円筒状ホルダ２０を用いる。この円筒状ホル
ダ２０の一端には、楔形の偏光子１４の平面側が中心軸
に対して直角になるように、接合面側が楔の角度に等し
い傾斜面をもつ偏光子装着用の凹部２２を設けておく。
円筒状ホルダ２０内にレンズ１６を圧入し、その一端の
前記凹部２２に偏光子１４を接着する。またファイバ付
きフェルール２４を前記円筒状ホルダ２０に他端側から
挿入する。ファイバ付きフェルール２４はファイバ１８
をフェルール２４内に挿入し接着したものであり、その
フェルール２４の外径は前記円筒状ホルダ２０の内径に
等しく、先端はファイバを含めて斜め研磨してある。そ
してレンズ１６の焦点距離にファイバ端面を合わせて偏
光子付きファイバコリメータ２６とする。このように偏
光子１４、レンズ１６、ファイバ１８を一体形構造とし
て組み立てる点に本発明の特徴がある。In this embodiment, a cylindrical holder 20 is used whose inner peripheral surface and outer peripheral surface have sufficient concentricity. At one end of this cylindrical holder 20, a recess 22 for attaching a polarizer is provided, the joint surface side of which has an inclined surface equal to the angle of the wedge so that the plane side of the wedge-shaped polarizer 14 is perpendicular to the central axis. I'll keep it. The lens 16 is press-fitted into the cylindrical holder 20, and the polarizer 14 is adhered to the recess 22 at one end thereof. Further, the fiber-equipped ferrule 24 is inserted into the cylindrical holder 20 from the other end side. The fiber-equipped ferrule 24 has the fiber 18
The outer diameter of the ferrule 24 is equal to the inner diameter of the cylindrical holder 20, and the tip including the fiber is obliquely polished. Then, the fiber end face is adjusted to the focal length of the lens 16 to form a fiber collimator 26 with a polarizer. A feature of the present invention is that the polarizer 14, lens 16, and fiber 18 are assembled into an integrated structure in this manner.
【００１３】更に本実施例では前記ファイバコリメータ
２６の外径を円筒状永久磁石１０の外径に等しくする。
そしてそれらの外径に等しい口径の円形貫通孔２８をも
つ光アイソレータ筐体３０を用い、ファラデー回転子１
２を組み込んだ円筒状永久磁石１０と２組の前記偏光子
付きファイバコリメータ２６を、光アイソレータ筐体３
０の円形貫通孔２８に挿入固定して光アイソレータとす
る。Furthermore, in this embodiment, the outer diameter of the fiber collimator 26 is made equal to the outer diameter of the cylindrical permanent magnet 10. Then, using an optical isolator housing 30 having a circular through hole 28 with a diameter equal to the outer diameter of the Faraday rotator 1
The cylindrical permanent magnet 10 incorporating the cylindrical permanent magnet 2 and the two sets of the polarizer-attached fiber collimators 26 are placed in the optical isolator housing 3.
It is inserted and fixed into the circular through hole 28 of 0 to form an optical isolator.
【００１４】本発明の光アイソレータの基本的動作は、
前記従来構造の光アイソレータと全く同様である。２個
の偏光子１４は、一方が狭義の偏光子として機能すれば
、他方は検光子として機能する。順方向の場合、第１の
（一方の）ファイバから入力した光は第２の（他方の）
ファイバからそのまま出力するが、逆方向の場合、第２
のファイバから入力した光は第１のファイバからは出力
しない。つまり非相反動作を行う。これによってレーザ
光源から出力した光は光伝送路へ出力するが、反射光が
レーザ光源へ戻るのは阻止できる。The basic operation of the optical isolator of the present invention is as follows:
This is exactly the same as the optical isolator of the conventional structure. If one of the two polarizers 14 functions as a polarizer in a narrow sense, the other functions as an analyzer. In the forward direction, light entering from the first (one) fiber is transmitted to the second (other) fiber.
Outputs directly from the fiber, but in the opposite direction, the second
The light input from the first fiber is not output from the first fiber. In other words, non-reciprocal operation is performed. This allows the light output from the laser light source to be output to the optical transmission path, but it is possible to prevent reflected light from returning to the laser light source.
【００１５】偏光子となる一軸性単結晶同士の間の光学
軸の角度ずれは順方向挿入損失には大きな影響は及ぼさ
ない。しかし、その角度ずれはアイソレーションには大
きな影響を与える。偏光子付きファイバコリメータ２６
を光アイソレータ筐体３０の円形貫通孔２８に挿入し、
円筒状ホルダ２０に対してフェルール２４を相対的に回
転・出入させて順方向で光の通過量が最大となるように
調整する。これによってファイバ間の結合をとる。また
光アイソレータ筐体３０に対して円筒状ホルダ２０を相
対的に回転させてアイソレーションが最大となるように
調整する。このようにして非相反素子部を組み立てる。
フェルール２４と円筒状ホルダ２０との固定、及び円筒
状ホルダ２０と光アイソレータ筐体３０との固定は、材
質に応じて接着あるいは溶接、もしくは圧入などで行う
。つまり本発明では、非相反素子部の組み立て及びファ
イバ間の結合を同時に行える構造となる。The angular misalignment of the optical axes between the uniaxial single crystals that serve as polarizers does not have a large effect on the forward insertion loss. However, the angular deviation has a large effect on isolation. Fiber collimator with polarizer 26
into the circular through hole 28 of the optical isolator housing 30,
The ferrule 24 is rotated and moved in and out relative to the cylindrical holder 20 to adjust the amount of light passing in the forward direction to be maximum. This creates a connection between the fibers. Further, the cylindrical holder 20 is rotated relative to the optical isolator housing 30 to adjust the isolation to be maximum. In this way, the non-reciprocal element section is assembled. The ferrule 24 and the cylindrical holder 20 are fixed, and the cylindrical holder 20 and the optical isolator housing 30 are fixed by adhesion, welding, press-fitting, etc. depending on the material. In other words, the present invention has a structure in which the assembly of the non-reciprocal element portion and the coupling between fibers can be performed simultaneously.
【００１６】更に本実施例ではフェルール先端のファイ
バ端面を斜め研磨しておく。その傾斜角度は、非相反素
子部で空間伝播する光路の中心軸からのずれ量を丁度相
殺できるような角度とする。またこの斜め研磨によって
光アイソレータ自体内での反射も低減できる。Furthermore, in this embodiment, the fiber end face at the tip of the ferrule is polished obliquely. The angle of inclination is such that the amount of deviation from the central axis of the optical path spatially propagating in the non-reciprocal element portion can be exactly offset. This oblique polishing also reduces reflection within the optical isolator itself.
【００１７】[0017]
【発明の効果】本発明は上記のように、偏光子、レンズ
、ファイバを円筒状ホルダに組み込んだ一体形構造とし
て光アイソレータ筐体に挿入する構成としたため、非相
反素子部の組み立て及びファイバ間の結合を同時に行う
ことができ、組立・調整工数が低減され、製作し易くな
る。その結果、組立精度が高く、アイソレーション特性
が良好で且つ精度の安定した光アイソレータを安価に製
作できることになる。[Effects of the Invention] As described above, the present invention has a structure in which the polarizer, lens, and fiber are assembled into a cylindrical holder and inserted into the optical isolator housing. can be combined at the same time, reducing assembly and adjustment man-hours and making manufacturing easier. As a result, an optical isolator with high assembly precision, good isolation characteristics, and stable precision can be manufactured at low cost.
【図１】本発明に係るファイバ入出力の偏光無依存型光
アイソレータの一実施例を示す断面図。FIG. 1 is a sectional view showing an embodiment of a fiber input/output polarization-independent optical isolator according to the present invention.
【図２】従来のファイバ入出力の偏光無依存型光アイソ
レータの説明図。FIG. 2 is an explanatory diagram of a conventional polarization-independent optical isolator with fiber input and output.
【図３】従来の非相反素子の説明図。FIG. 3 is an explanatory diagram of a conventional non-reciprocal element.
１０ 永久磁石
１２ ファラデー回転子
１４ 偏光子
１５ 非相反素子
１６ レンズ
１８ ファイバ
２０ 円筒状ホルダ
２４ フェルール
２６ 偏光子付きファイバコリメータ２８ 円形貫
通孔
３０ 光アイソレータ筐体10 Permanent magnet 12 Faraday rotator 14 Polarizer 15 Non-reciprocal element 16 Lens 18 Fiber 20 Cylindrical holder 24 Ferrule 26 Fiber collimator with polarizer 28 Circular through hole 30 Optical isolator housing
Claims (1)
子を装着し、その両側にそれぞれ楔形の一軸性単結晶か
らなる偏光子を配置したファイバ入出力の偏光無依存形
光アイソレータにおいて、円筒状ホルダ内にレンズを収
容し、該円筒状ホルダの一端に偏光子を装着すると共に
他端からファイバ付きフェルールを挿入して偏光子付き
ファイバコリメータとし、前記レンズの焦点距離にファ
イバ端面を合わせ、ファラデー回転子を組み込んだ円筒
状永久磁石と２組の前記偏光子付きファイバコリメータ
を光アイソレータ筐体の円形貫通孔に挿入固定したこと
を特徴とする光アイソレータ。Claim 1: A polarization-independent optical isolator with fiber input and output, in which a Faraday rotator is installed in a cylindrical permanent magnet, and polarizers made of wedge-shaped uniaxial single crystals are arranged on both sides of the rotator. A lens is housed in a holder, a polarizer is attached to one end of the cylindrical holder, and a ferrule with a fiber is inserted from the other end to form a fiber collimator with a polarizer, the end face of the fiber is adjusted to the focal length of the lens, and a Faraday An optical isolator characterized in that a cylindrical permanent magnet incorporating a rotor and two sets of the fiber collimators with polarizers are inserted and fixed into a circular through hole of an optical isolator housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3031547A JP2857502B2 (en) | 1991-01-31 | 1991-01-31 | Optical isolator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3031547A JP2857502B2 (en) | 1991-01-31 | 1991-01-31 | Optical isolator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04246615A true JPH04246615A (en) | 1992-09-02 |
| JP2857502B2 JP2857502B2 (en) | 1999-02-17 |
Family
ID=12334221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3031547A Expired - Fee Related JP2857502B2 (en) | 1991-01-31 | 1991-01-31 | Optical isolator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2857502B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0720033A1 (en) * | 1994-12-28 | 1996-07-03 | Kyocera Corporation | Optical connector |
| US6048103A (en) * | 1995-12-21 | 2000-04-11 | Kyocera Corporation | Polarization independent optical isolator with integrally assembled birefringent crystal element and Faraday rotator |
| US6297901B1 (en) | 1999-01-14 | 2001-10-02 | Samsung Electronics Co., Ltd. | Optical attenuating isolator |
| US6600601B1 (en) * | 1999-04-12 | 2003-07-29 | Shin-Etsu Chemical Co., Ltd. | Polarization-independent optical isolator and production method thereof |
-
1991
- 1991-01-31 JP JP3031547A patent/JP2857502B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0720033A1 (en) * | 1994-12-28 | 1996-07-03 | Kyocera Corporation | Optical connector |
| US6048103A (en) * | 1995-12-21 | 2000-04-11 | Kyocera Corporation | Polarization independent optical isolator with integrally assembled birefringent crystal element and Faraday rotator |
| US6297901B1 (en) | 1999-01-14 | 2001-10-02 | Samsung Electronics Co., Ltd. | Optical attenuating isolator |
| US6600601B1 (en) * | 1999-04-12 | 2003-07-29 | Shin-Etsu Chemical Co., Ltd. | Polarization-independent optical isolator and production method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2857502B2 (en) | 1999-02-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |