JPS6273227A - Optical isolator - Google Patents
Optical isolatorInfo
- Publication number
- JPS6273227A JPS6273227A JP21256985A JP21256985A JPS6273227A JP S6273227 A JPS6273227 A JP S6273227A JP 21256985 A JP21256985 A JP 21256985A JP 21256985 A JP21256985 A JP 21256985A JP S6273227 A JPS6273227 A JP S6273227A
- Authority
- JP
- Japan
- Prior art keywords
- polarizing prism
- holder
- faraday
- faraday rotator
- optical isolator
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/09—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect
- G02F1/093—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on magneto-optical elements, e.g. exhibiting Faraday effect used as non-reciprocal devices, e.g. optical isolators, circulators
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
Abstract
Description
【発明の詳細な説明】
〔概 要〕
入射偏光プリズムと、ファラデー回転子と、出射偏光プ
リズムとを保持体で保持してなる光アイソレータであっ
て、入射偏光プリズム及び出射偏光プリズムのいずれか
一方を他方に対し印加磁場方向に垂直な面内で回転可能
とすることにより、両偏光プリズムの光学軸の偏角をフ
ァラデー回転角に一致させ、ファラデー回転角のバラツ
キを補償して常に安定した高いアイソレーション特性が
得られるようにしたものである。[Detailed Description of the Invention] [Summary] An optical isolator comprising an input polarizing prism, a Faraday rotator, and an output polarizing prism held by a holder, the optical isolator comprising either the input polarizing prism or the output polarizing prism. can be rotated relative to the other in a plane perpendicular to the direction of the applied magnetic field, so that the polarization angles of the optical axes of both polarizing prisms match the Faraday rotation angle, and variations in the Faraday rotation angle are compensated for, resulting in a consistently high and stable polarizing prism. This allows isolation characteristics to be obtained.
本発明は光フアイバ伝送の発信部における光源への光の
反射帰還を阻止する光アイソレータに関し、特に入射偏
光プリズムと、ファラデー回転子と、出射偏光プリズム
とを保持体で保持してなる光アイソレータにおけるファ
ラデー回転子の回転角のバラツキによる特性のバラツキ
を補正するための改良構造に関する。The present invention relates to an optical isolator that prevents light from being reflected back to a light source in a transmission section of optical fiber transmission, and more particularly to an optical isolator in which an input polarizing prism, a Faraday rotator, and an output polarizing prism are held by a holder. The present invention relates to an improved structure for correcting variations in characteristics due to variations in the rotation angle of a Faraday rotator.
第２図に上記の如き光アイソレータの従来例を示しであ
る０図中、Ｐｌ及びＰ２はそれぞれ例えばルチルからな
る入射偏光プリズム及び出射偏光プリズム、ＦＲは例え
ばＹＩＧ （Ｙ３ＦｅｓＯ＋ｚ）からなるファラデー回
転子、Ｓは例えばセラミックからなるスペーサを示し、
これらの素子は箱形の保持体Ｈ内に納められて保持され
ている。そしてその周囲に例えば５ｓ−Ｃｏからなるマ
グネット（永久磁石）Ｍが配置されている。FIG. 2 shows a conventional example of the above-mentioned optical isolator. In FIG. 2, Pl and P2 are respectively an input polarizing prism and an output polarizing prism made of rutile, for example, and FR is a Faraday rotator made of YIG (Y3FesO+z), for example. S indicates a spacer made of ceramic, for example,
These elements are housed and held within a box-shaped holder H. A magnet (permanent magnet) M made of, for example, 5s-Co is arranged around it.
ファラデー回転子ＦＲは一般に４５°のファラデー回転
角を与える厚みに形成され、そして入射偏光プリズムＰ
１と出射偏光プリズムＰ２とはそれらの光学軸が相互に
４５°の偏角をなずように配置されている。The Faraday rotator FR is typically formed to a thickness that provides a Faraday rotation angle of 45°, and the input polarizing prism P
1 and the output polarizing prism P2 are arranged so that their optical axes are at an angle of deviation of 45° from each other.
上記のような光アイソレータではファラデー回転子ＦＲ
のファラデー回転角がアイソレーション特性に直接的に
影響する。しかるにファラデー回転子ＦＲのファラデー
回転角は結晶の品質のバラツキや製作時の厚さのバラツ
キのために素子ごとにバラツキがあり、設計値の４５°
から大きくはずれた場合にはアイソレーション特性の低
下が生ずる。しかし従来構造ではこのようなファラデー
回転角のバラツキによるアイソレーション特性のバラツ
キ及び低下を補償することが不可能である。In the above optical isolator, Faraday rotator FR
The Faraday rotation angle of directly affects the isolation characteristics. However, the Faraday rotation angle of the Faraday rotator FR varies from element to element due to variations in the quality of the crystal and variations in the thickness during manufacturing, and the Faraday rotation angle is 45° from the designed value.
If there is a large deviation from the range, the isolation characteristics will deteriorate. However, with the conventional structure, it is impossible to compensate for variations and deterioration in isolation characteristics due to such variations in the Faraday rotation angle.
本発明はこのような従来技術の問題点を解決することを
目的とするものである。The present invention aims to solve these problems of the prior art.
〔問題点を解決するための手段〕
本発明は上記問題点を解決するため、前記のような光ア
イソレータにおいて入射偏光プリズム及び出射偏光プリ
ズムのいずれか一方を他方に対し印加磁場方向に垂直な
面内で回転し得るように構成したものである。[Means for Solving the Problems] In order to solve the above problems, the present invention provides an optical isolator in which one of the input polarizing prism and the output polarizing prism is arranged in a plane perpendicular to the direction of the applied magnetic field with respect to the other. It is constructed so that it can be rotated within.
上記の構造によれば、入射偏光プリズムまたは出射偏光
プリズムを回転させることにより、両偏光プリズムの光
学軸の偏角をファラデー回転子のファラデー回転角に応
じて調整することができる。According to the above structure, by rotating the input polarizing prism or the output polarizing prism, the polarization angles of the optical axes of both polarizing prisms can be adjusted according to the Faraday rotation angle of the Faraday rotator.
つまりファラデー回転角にバラツキがあっても両偏光プ
リズムの光学軸の偏角をそれに一致させることができ、
常に安定した高いアイソレーション特性が得られること
になる。In other words, even if the Faraday rotation angle varies, the polarization angles of the optical axes of both polarizing prisms can be made to match it.
This means that stable and high isolation characteristics can be obtained at all times.
第１図は本考案の光アイソレータの一実施例を示す。図
中、符号ＰＬ 、 Ｐ２ 、 ＦＲ、Ｍはそれぞれ入射
偏光プリズム、出射偏光プリズム、ファラデー回転子、
マグネットを示し、これらは基本的に前述した第２図の
従来例のものと同一あるいは類似のものである。FIG. 1 shows an embodiment of the optical isolator of the present invention. In the figure, symbols PL, P2, FR, and M are respectively an input polarizing prism, an output polarizing prism, a Faraday rotator,
The magnets shown are basically the same or similar to those of the prior art example of FIG. 2 described above.
以上の要素ＰＩ 、 Ｐ２ 、 ＰＲ、Ｍは３つの保持
体旧。The above elements PI, P2, PR, and M are the three holding bodies.
Ｈ２、８３によって保持されている。第１及び第２の保
持体旧、Ｈ２は共に円盤状であり、それぞれ光入射口Ｈ
１ｂ、光出射口Ｈ２ｂを有すると共に、内側に外形が円
柱状のボスＨ１ａ、Ｈ２ａを有し、第１保持体Ｈ１のボ
スＨ１ａ内には入射偏光プリズムＰ】が、そして第２保
持体Ｈ２のポスＨ２ａ内にはファラデー回転子ＦＲ及び
出射偏光プリズムＰ２がそれぞれ収容保持されている。It is held by H2,83. The first and second holders H2 and H2 are both disc-shaped, and each has a light entrance H2.
1b, has a light exit opening H2b, and internally has bosses H1a and H2a with a cylindrical outer shape, an incident polarizing prism P] is located inside the boss H1a of the first holder H1, and an incident polarizing prism P] is located inside the boss H1a of the first holder H1. A Faraday rotator FR and an output polarizing prism P2 are housed and held in the post H2a, respectively.
マグネットＭは環状であり、第１及び第２の保持体旧、
Ｈ２のボスＨ１ａ。The magnet M is annular and has a first and second holding body,
H2's boss H1a.
Ｈ２ａに嵌着され、その外側に第３の環状保持体Ｈ３が
嵌着されている。H2a is fitted, and a third annular holding body H3 is fitted on the outside thereof.
第１保持体Ｈ１はそれのボスＨ１ａの中心軸線を中心と
して第２保持体Ｈ２に対して回転可能としである。第１
保持体Ｈ１を回転することにより入射偏光プリズムＰ１
はマグネッ）Ｍの印加磁界力向と垂直な面（つまり保持
体Ｈ１の回転中心軸線と垂直な面）内でファラデー回転
子ＦＲ及び出射偏光プリズムＰ２に対して回転させるこ
とができ、これにより入射偏光プリズムＰ１と出射偏光
プリズムＰ２の光学軸の偏角を調整してこれをファラデ
ー回転子ＦＲのファラデー回転角に一致させることが可
能である。従ってファラデー回転子ＦＲのファラデー回
転角にバラツキがあっても、出射偏光プリズムＰ１の回
転によってそれを補償して常に安定した高いアイソレー
ション特性を得ることが可能である。The first holder H1 is rotatable relative to the second holder H2 about the central axis of its boss H1a. 1st
By rotating the holder H1, the input polarizing prism P1
can be rotated with respect to the Faraday rotator FR and the output polarizing prism P2 in a plane perpendicular to the applied magnetic field force direction of the magnet (magnet) M (that is, a plane perpendicular to the rotation center axis of the holder H1). It is possible to adjust the polarization angles of the optical axes of the polarizing prism P1 and the output polarizing prism P2 to match the Faraday rotation angle of the Faraday rotator FR. Therefore, even if there is variation in the Faraday rotation angle of the Faraday rotator FR, it is possible to compensate for it by rotating the output polarizing prism P1 and always obtain stable and high isolation characteristics.
尚、図示実施例では出射偏光プリズムＰ２を固定して入
射偏光プリズムＰ１を回転可能とした構造であるが、そ
の逆とすることも可能であり、その場合も全く同様の効
果が得られる。Although the illustrated embodiment has a structure in which the output polarizing prism P2 is fixed and the input polarizing prism P1 is rotatable, it is also possible to do the opposite, and in that case, exactly the same effect can be obtained.
また、図示実施例ではメタル固定を考慮して第３保持体
Ｈ３を設けであるが、接着剤等による樹脂固定でもよく
、その場合には第３保持体Ｈ３が不要で、その分だけ全
体の小型化が可能である。Further, in the illustrated embodiment, the third holder H3 is provided in consideration of metal fixation, but resin fixation using adhesive or the like may also be used. In that case, the third holder H3 is not necessary, and the overall Miniaturization is possible.
以」二の如く本発明の光アイソレータは入射偏光プリズ
ム及び出射偏光プリズムの一方を他方に対して回転可能
としたことによりファラデー回転子のファラデー回転角
のバラツキを補償して常に安定した高いアイソレーショ
ン特性を得ることが可能である。As described above, the optical isolator of the present invention makes one of the input polarizing prism and the output polarizing prism rotatable with respect to the other, thereby compensating for variations in the Faraday rotation angle of the Faraday rotator, and achieving always stable high isolation. It is possible to obtain the characteristics.
第１図は本発明の光アイソレータの一実施例を示す図、 第２図は従来の光アイソレータの一例を示す図である。 第１図において、 Ｐｌ・・・入射偏光プリズム、 Ｐ２・・・出射偏光プリズム、 ＦＲ・・・ファラデー回転子、 Ｍ・・・マグネット、 旧、 Ｈ２、Ｈ３・・・保持体である。 ｉ鵠圧 Ｐｌ・・・入射偏光プリズム η・・・出射偏光プリズム Ｒ・・・ファラデー回転子 −１１，ｎ− Ｍ・・・マグネット Ｈ・・・保持体 FIG. 1 is a diagram showing an embodiment of the optical isolator of the present invention, FIG. 2 is a diagram showing an example of a conventional optical isolator. In Figure 1, Pl...Incidence polarizing prism, P2... Output polarizing prism, FR...Faraday rotator, M...Magnet, Old, H2, H3... Holder. i pressure Pl...Incidence polarizing prism η...Output polarizing prism R...Faraday rotator -11,n- M...Magnet H...Holding body
Claims (1)
光プリズムとを保持体で保持してなる光アイソレータに
おいて、前記入射偏光プリズム及び出射偏光プリズムの
いずれか一方を他方に対し印加磁場方向に垂直な面内で
回転し得るように構成されたことを特徴とする光アイソ
レータ。1. In an optical isolator in which an input polarizing prism, a Faraday rotator, and an output polarizing prism are held by a holder, one of the input polarizing prism and the output polarizing prism is arranged perpendicular to the direction of the applied magnetic field with respect to the other. An optical isolator characterized in that it is configured to be able to rotate within a plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21256985A JPS6273227A (en) | 1985-09-27 | 1985-09-27 | Optical isolator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21256985A JPS6273227A (en) | 1985-09-27 | 1985-09-27 | Optical isolator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6273227A true JPS6273227A (en) | 1987-04-03 |
Family
ID=16624866
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21256985A Pending JPS6273227A (en) | 1985-09-27 | 1985-09-27 | Optical isolator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6273227A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63267912A (en) * | 1987-04-27 | 1988-11-04 | Fujitsu Ltd | Temperature self-compensation type optical isolator |
| JPS6449917U (en) * | 1987-09-24 | 1989-03-28 | ||
| JPH0222619A (en) * | 1988-07-11 | 1990-01-25 | Nec Corp | Optical isolator and its production |
| EP0352844A2 (en) * | 1988-07-23 | 1990-01-31 | Philips Patentverwaltung GmbH | Optical isolator, circulator, switch or similar device with a Faraday rotator |
| EP0369384A2 (en) * | 1988-11-18 | 1990-05-23 | Fujitsu Limited | Laser module with a built-in optical isolator, and method of adjusting the angular position of the optical isolator |
| JPH02235014A (en) * | 1989-03-09 | 1990-09-18 | Hitachi Metals Ltd | Single-step optical isolator |
| JPH036619U (en) * | 1989-06-08 | 1991-01-23 | ||
| JPH0335518U (en) * | 1989-08-12 | 1991-04-08 | ||
| JPH04153619A (en) * | 1990-10-18 | 1992-05-27 | Fuji Elelctrochem Co Ltd | Optical isolator |
| US5402260A (en) * | 1990-08-06 | 1995-03-28 | Kyocera Corporation | Element for optical isolator and optical isolator employing the same, together with semiconductor laser module employing the optical isolator element |
| US5519467A (en) * | 1993-03-10 | 1996-05-21 | Tokin Corporation | Optical isolator device capable of preventing optical axis from inclining by deformation of adhesive |
-
1985
- 1985-09-27 JP JP21256985A patent/JPS6273227A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63267912A (en) * | 1987-04-27 | 1988-11-04 | Fujitsu Ltd | Temperature self-compensation type optical isolator |
| JPS6449917U (en) * | 1987-09-24 | 1989-03-28 | ||
| JPH0222619A (en) * | 1988-07-11 | 1990-01-25 | Nec Corp | Optical isolator and its production |
| US5612813A (en) * | 1988-07-23 | 1997-03-18 | U.S. Philips Corporation | Optical isolator, circulator, switch or the like, including a faraday rotator |
| EP0352844A2 (en) * | 1988-07-23 | 1990-01-31 | Philips Patentverwaltung GmbH | Optical isolator, circulator, switch or similar device with a Faraday rotator |
| EP0369384A2 (en) * | 1988-11-18 | 1990-05-23 | Fujitsu Limited | Laser module with a built-in optical isolator, and method of adjusting the angular position of the optical isolator |
| JPH02235014A (en) * | 1989-03-09 | 1990-09-18 | Hitachi Metals Ltd | Single-step optical isolator |
| JPH036619U (en) * | 1989-06-08 | 1991-01-23 | ||
| JPH0335518U (en) * | 1989-08-12 | 1991-04-08 | ||
| US5402260A (en) * | 1990-08-06 | 1995-03-28 | Kyocera Corporation | Element for optical isolator and optical isolator employing the same, together with semiconductor laser module employing the optical isolator element |
| US5452122A (en) * | 1990-08-06 | 1995-09-19 | Kyocera Corporation | Element for optical isolator and optical isolator employing the same, together with semiconductor laser module employing the optical isolator element |
| JPH04153619A (en) * | 1990-10-18 | 1992-05-27 | Fuji Elelctrochem Co Ltd | Optical isolator |
| US5519467A (en) * | 1993-03-10 | 1996-05-21 | Tokin Corporation | Optical isolator device capable of preventing optical axis from inclining by deformation of adhesive |
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