JPS6158811B2 - - Google Patents
Info
- Publication number
- JPS6158811B2 JPS6158811B2 JP58240372A JP24037283A JPS6158811B2 JP S6158811 B2 JPS6158811 B2 JP S6158811B2 JP 58240372 A JP58240372 A JP 58240372A JP 24037283 A JP24037283 A JP 24037283A JP S6158811 B2 JPS6158811 B2 JP S6158811B2
- Authority
- JP
- Japan
- Prior art keywords
- birefringent
- optical isolator
- birefringent tapered
- faraday rotator
- tapered plate
- 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
Links
- 230000003287 optical effect Effects 0.000 claims description 28
- 239000013307 optical fiber Substances 0.000 description 17
- 238000010586 diagram Methods 0.000 description 8
- 239000004065 semiconductor Substances 0.000 description 4
- 238000002955 isolation Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
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)
- Optical Communication System (AREA)
Description
【発明の詳細な説明】 (a) 発明の技術分野 本発明は光アイソレータの構成に関する。[Detailed description of the invention] (a) Technical field of the invention The present invention relates to the configuration of an optical isolator.
(b) 技術の背景
光通信回路網の光源として用いられる半導体レ
ーザに、光フアイバによつて逆方向に伝送されて
きた回路網の途中における反射光等が照射すると
光信号にノイズが発生する。そこで逆方向に伝送
されてきた光が半導体レーザに照射するのを防
ぎ、半導体レーザの動作を安定化するために半導
体レーザの前に光アイソレータを挿入し、順方向
の光線は回路網を構成する光フアイバに入射する
が逆方向の光線は光フアイバの外に逸らすという
操作を行つている。(b) Background of the Technology When a semiconductor laser used as a light source in an optical communication network is irradiated with reflected light in the middle of the network that has been transmitted in the opposite direction via an optical fiber, noise is generated in the optical signal. Therefore, an optical isolator is inserted in front of the semiconductor laser to prevent the light transmitted in the opposite direction from irradiating the semiconductor laser and to stabilize the operation of the semiconductor laser, and the light beam in the forward direction forms a circuit network. An operation is performed in which light rays that enter the optical fiber but in the opposite direction are deflected out of the optical fiber.
(c) 従来技術と問題点
第１図は従来の複屈折テーパ板と45度フアラデ
ー回転子よりなる光アイソレータの構成例、第２
図は光アイソレータの動作を表した図で、第２図
ａは順方向の光線に対する動作、第２図ｂは逆方
向の光線に対する動作を表した図である。図にお
いて１Ａ，１Ｂは光フアイバ、２Ａ，２Ｂはレン
ズ、３Ａ，３Ｂは複屈折テーパ板、４は45度フア
ラデー回転子を示す。(c) Prior art and problems Figure 1 shows an example of the configuration of a conventional optical isolator consisting of a birefringent tapered plate and a 45 degree Faraday rotator.
The figures show the operation of the optical isolator; FIG. 2a is a diagram showing the operation with respect to light rays in the forward direction, and FIG. 2b is a diagram showing the operation with respect to light rays in the reverse direction. In the figure, 1A and 1B are optical fibers, 2A and 2B are lenses, 3A and 3B are birefringent tapered plates, and 4 is a 45-degree Faraday rotator.
第１図の光アイソレータの動作は第２図ａに示
した如く、光フアイバ１Ａからレンズ２Ａを経由
して複屈折テーパ板３Ａに入射した順方向の光線
は、複屈折テーパ板３Ａ、45度フアラデー回転子
４および複屈折テーパ板３Ｂを透過する間に二光
線に分離されるが、分離された二光線は平行であ
りレンズ２Ｂによつて集光され光フアイバ１Ｂに
入射する。また第２図ｂに示した如く、光フアイ
バ１Ｂからレンズ２Ｂを経由して複屈折テーパ板
３Ｂに入射した逆方向の光線は、複屈折テーパ板
３Ｂ、45度フアラデー回転子４および複屈折テー
パ板３Ａを透過する間に二方向の光線に分離さ
れ、レンズ２Ａを通しても集光されることなく光
フアイバ１Ａには入射しない。 The operation of the optical isolator shown in FIG. 1 is as shown in FIG. The light beam is separated into two beams while passing through the Faraday rotator 4 and the birefringent tapered plate 3B, but the two separated beams are parallel and are focused by the lens 2B and enter the optical fiber 1B. Furthermore, as shown in FIG. 2b, the light beam in the opposite direction entering the birefringent taper plate 3B from the optical fiber 1B via the lens 2B is transmitted through the birefringent taper plate 3B, the 45-degree Faraday rotator 4, and the birefringent taper plate 3B. While passing through the plate 3A, the light beam is separated into two directions, and even when it passes through the lens 2A, it is not focused and does not enter the optical fiber 1A.
しかし光フアイバ１Ａは分離された二光線の中
間にあるために実際にはフアラデー回転子で完全
に施光されなかつた成分が光フアイバ１Ａに向か
つて直進し、光フアイバ１Ａに入射する光を零に
することができず、かかる光アイソレータでは光
信号に発生するノイズを十分に取り除くことはで
きなかつた。 However, since the optical fiber 1A is located in the middle of the two separated beams, the component that was not completely exposed by the Faraday rotator actually travels straight toward the optical fiber 1A, reducing the light incident on the optical fiber 1A to zero. Therefore, such an optical isolator could not sufficiently remove the noise generated in the optical signal.
(d) 発明の目的
本発明の目的は光フアイバに入射する逆方向の
光線を十分に取り除き、アイソレーシヨンの高い
光アイソレータを提供することにある。(d) Object of the Invention An object of the invention is to provide an optical isolator with high isolation by sufficiently removing rays of light in the opposite direction that are incident on an optical fiber.
(e) 発明の構成
そしてこの目的は第１の複屈折テーパ板と第２
の複屈折テーパ板の間に第１の45度フアラデー回
転子を配設してなるユニツトと、第３の複屈折テ
ーパ板と第４の複屈折テーパ板の間に第２の45度
フアラデー回転子を配設してなるユニツトを直列
に並べ、且つ第１および第２の複屈折テーパ板の
傾斜方向と第３および第４の複屈折テーパ板の傾
斜方向を90度ずらしたことで達成している。(e) Structure of the invention And this purpose is to
A unit in which a first 45-degree Faraday rotator is arranged between the birefringent tapered plates, and a second 45-degree Faraday rotator is arranged between the third birefringent tapered plate and the fourth birefringent tapered plate. This is achieved by arranging the units in series, and by shifting the inclination directions of the first and second birefringent tapered plates from the inclination directions of the third and fourth birefringent tapered plates by 90 degrees.
(f) 発明の実施例
以下添付図により本発明の実施例を説明する。
第３図は本発明の一実施例を示す斜視図であり、
第４図は本発明になる光アイソレータの動作を表
した図で、第４図ａは順方向の光線に対する動
作、第４図ｂは逆方向の光線に対する動作を表し
た図である。なお第１図と同じ対象物は同一符号
で表している。図において１Ａ，１Ｂは光フアイ
バ、２Ａ，２Ｂはレンズ、３Ａは第１の複屈折テ
ーパ板、３Ｂは第２の複屈折テーパ板、３Ｃは第
３の複屈折テーパ板、３Ｄは第４の複屈折テーパ
板、４Ａは第１の45度フアラデー回転子、４Ｂは
第２の45度フアラデー回転子を示す。(f) Embodiments of the invention Examples of the invention will be described below with reference to the accompanying drawings.
FIG. 3 is a perspective view showing an embodiment of the present invention,
FIG. 4 is a diagram showing the operation of the optical isolator according to the present invention. FIG. 4a is a diagram showing the operation with respect to a light beam in the forward direction, and FIG. 4b is a diagram showing the operation with respect to a light beam in the reverse direction. Note that the same objects as in FIG. 1 are represented by the same symbols. In the figure, 1A and 1B are optical fibers, 2A and 2B are lenses, 3A is a first birefringent tapered plate, 3B is a second birefringent tapered plate, 3C is a third birefringent tapered plate, and 3D is a fourth birefringent tapered plate. In the birefringent tapered plate, 4A is a first 45-degree Faraday rotator, and 4B is a second 45-degree Faraday rotator.
本発明になる光アイソレータは第３図に示した
如く従来の光アイソレータの複屈折テーパ板の傾
斜方向を90度ずらして２段接続したもので、第１
の複屈折テーパ板３Ａと第２の複屈折テーパ板３
Ｂの間に第１の45度フアラデー回転子４Ａを配設
して１段目の光アイソレータを構成し、第３の複
屈折テーパ板３Ｃと第４の複屈折テーパ板３Ｄの
間に第２の45度フアラデー回転子４Ｂを配設して
２段目の光アイソレータを構成し、これを直列に
並べて２段接続の光アイソレータを構成してい
る。そして第１および第２の複屈折テーパ板の傾
斜方向と第３および第４の複屈折テーパ板の傾斜
方向を相互に90度ずらしている。 As shown in FIG. 3, the optical isolator of the present invention is a conventional optical isolator in which the birefringent tapered plates are connected in two stages with the inclination direction shifted by 90 degrees.
birefringent tapered plate 3A and second birefringent tapered plate 3
A first 45-degree Faraday rotator 4A is disposed between B to form a first-stage optical isolator, and a second 45-degree Faraday rotator is disposed between the third birefringent tapered plate 3C and the fourth birefringent tapered plate 3D. A 45-degree Faraday rotator 4B is disposed to constitute a second stage optical isolator, and these are arranged in series to constitute a two-stage connected optical isolator. The inclination directions of the first and second birefringent tapered plates and the inclination directions of the third and fourth birefringence taper plates are shifted by 90 degrees from each other.
かかる構成の光アイソレータに光フアイバ１Ａ
からレンズ２Ａを経由して入射した順方向の光線
は第４図ａに示した如く、１段目の光アイソレー
タを透過する間に二光線に分離され、更に２段目
の光アイソレータを透過する間にそれぞれが二光
線に分離されるが、分離された四光線は平行であ
りレンズ２Ｂによつて集光され光フアイバ１Ｂに
入射する。また光フアイバ１Ｂからレンズ２Ｂを
経由して複屈折テーパ板３Ｂに入射した逆方向の
光線は第４図ｂに示した如く、２段目の光アイソ
レータを逆に透過する間に二光線に分離され、更
に１段目の光アイソレータを逆に透過する間にそ
れぞれが二光線に分離される。この構成によれば
光アイソレータを二回通しているので、フアラデ
ー回転子の不完全等によるアイソレーシヨンの劣
化は極めて小さくなる。 An optical fiber 1A is connected to the optical isolator having such a configuration.
As shown in Figure 4a, the forward light ray that enters from the lens 2A through the lens 2A is separated into two light beams while passing through the first stage optical isolator, and further passes through the second stage optical isolator. During this time, each light beam is separated into two light beams, but the four separated light beams are parallel and are focused by the lens 2B and enter the optical fiber 1B. In addition, the light beam in the opposite direction that enters the birefringent tapered plate 3B from the optical fiber 1B via the lens 2B is separated into two light beams while passing through the second stage optical isolator in reverse, as shown in Figure 4b. The light is then transmitted through the first stage optical isolator, and each beam is separated into two beams. According to this configuration, since the light passes through the optical isolator twice, deterioration in isolation due to imperfections in the Faraday rotator is extremely small.
(g) 発明の効果
以上述べたように本発明によれば、光フアイバ
に入射する逆方向の光線を十分に取り除き、アイ
ソレーシヨンの高い光アイソレータを提供するこ
とができる。(g) Effects of the Invention As described above, according to the present invention, it is possible to sufficiently remove the light rays incident on the optical fiber in the opposite direction, and to provide an optical isolator with high isolation.
第１図は従来の複屈折テーパ板と45度フアラデ
ー回転子よりなる光アイソレータの構成例、第２
図は光アイソレータの動作を表した図で、第２図
ａは順方向の光線に対する動作、第２図ｂは逆方
向の光線に対する動作を表した図、第３図は本発
明の一実施例を表す斜視図であり、第４図は本発
明になる光アイソレータの動作を表した図で、第
４図ａは順方向の光線に対する動作、第４図ｂは
逆方向の光線に対する動作を表した図である。
図において１Ａ，１Ｂは光フアイバ、２Ａ，２
Ｂはレンズ、３Ａは第１の複屈折テーパ板、３Ｂ
は第２の複屈折テーパ板、３Ｃは第３の複屈折テ
ーパ板、３Ｄは第４の複屈折テーパ板、４Ａは第
１の45度フアラデー回転子、４Ｂは第２の45度フ
アラデー回転子を示す。
Figure 1 shows an example of the configuration of a conventional optical isolator consisting of a birefringent tapered plate and a 45-degree Faraday rotator.
The figures are diagrams showing the operation of the optical isolator, in which Fig. 2a shows the operation with respect to forward direction light rays, Fig. 2b shows the operation with respect to reverse direction light rays, and Fig. 3 shows one embodiment of the present invention. FIG. 4 is a diagram showing the operation of the optical isolator according to the present invention, in which FIG. 4a shows the operation with respect to light rays in the forward direction, and FIG. This is a diagram. In the figure, 1A, 1B are optical fibers, 2A, 2
B is the lens, 3A is the first birefringent tapered plate, 3B
is the second birefringent tapered plate, 3C is the third birefringent tapered plate, 3D is the fourth birefringent tapered plate, 4A is the first 45-degree Faraday rotator, and 4B is the second 45-degree Faraday rotator. shows.
Claims (1)
なる光アイソレータにおいて、第１の複屈折テー
パ板と第２の複屈折テーパ板の間に第１の45度フ
アラデー回転子を配設してなるユニツトと、第３
の複屈折テーパ板と第４の複屈折テーパ板の間に
第２の45度フアラデー回転子を配設してなるユニ
ツトを直列に並べ、且つ第１および第２の複屈折
テーパ板の傾斜方向と第３および第４の複屈折テ
ーパ板の傾斜方向を90度ずらしたことを特徴とす
る光アイソレータ。1. An optical isolator consisting of a birefringent tapered plate and a 45-degree Faraday rotator, in which a first 45-degree Faraday rotator is disposed between the first birefringent tapered plate and the second birefringent tapered plate; Third
A unit in which a second 45 degree Faraday rotator is arranged between a birefringent tapered plate and a fourth birefringent tapered plate is arranged in series, and the inclination direction of the first and second birefringent tapered plates is An optical isolator characterized in that the inclination directions of the third and fourth birefringent tapered plates are shifted by 90 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58240372A JPS60130934A (en) | 1983-12-20 | 1983-12-20 | Optical isolator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58240372A JPS60130934A (en) | 1983-12-20 | 1983-12-20 | Optical isolator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60130934A JPS60130934A (en) | 1985-07-12 |
| JPS6158811B2 true JPS6158811B2 (en) | 1986-12-13 |
Family
ID=17058509
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58240372A Granted JPS60130934A (en) | 1983-12-20 | 1983-12-20 | Optical isolator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60130934A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63160005U (en) * | 1987-04-06 | 1988-10-19 |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6317426A (en) * | 1986-07-09 | 1988-01-25 | Nec Corp | Optical isolator |
| US4893890A (en) * | 1988-05-04 | 1990-01-16 | Lutes George F | Low-loss, high-isolation, fiber-optic isolator |
| US4974944A (en) * | 1988-07-21 | 1990-12-04 | Hewlett-Packard Company | Optical nonreciprocal device |
| JPH02126219A (en) * | 1988-11-04 | 1990-05-15 | Fuji Elelctrochem Co Ltd | Optical isolator |
| US4988170A (en) * | 1989-03-31 | 1991-01-29 | Gte Laboratories Incorporated | Quasi-achromatic optical isolators and circulators |
| US4991938A (en) * | 1989-04-07 | 1991-02-12 | Gte Laboratories Incorporated | Quasi-achromatic optical isolators and circulators using prisms with total internal fresnel reflection |
| US5237445A (en) * | 1990-11-30 | 1993-08-17 | Shimadzu Corporation | Optical isolator |
| US5267078A (en) * | 1990-12-20 | 1993-11-30 | Kazuo Shiraishi | Optical isolator |
| CA2080904A1 (en) * | 1991-02-20 | 1992-08-21 | Shigeru Hirai | Optical isolator |
| JP3160319B2 (en) * | 1991-07-25 | 2001-04-25 | 株式会社信光社 | Optical isolator |
| JPH0547911U (en) * | 1991-11-30 | 1993-06-25 | 富士電気化学株式会社 | Polarization independent optical isolator |
| JPH05196890A (en) * | 1992-01-22 | 1993-08-06 | Nec Corp | Optical isolator |
| US6278547B1 (en) * | 1998-05-06 | 2001-08-21 | Hughes Electronics Corporation | Polarization insensitive faraday attenuator |
| US6075642A (en) * | 1998-06-18 | 2000-06-13 | Hewlett-Packard Company | Multi-port optical isolator |
| US6792192B1 (en) | 2000-10-04 | 2004-09-14 | Mitsubishi Denki Kabushiki Kaisha | Optical variable attenuator |
| US6628461B2 (en) * | 2001-01-10 | 2003-09-30 | Finisar Corporation | Method and apparatus for a polarization beam splitter/combiner with an integrated optical isolator |
-
1983
- 1983-12-20 JP JP58240372A patent/JPS60130934A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63160005U (en) * | 1987-04-06 | 1988-10-19 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60130934A (en) | 1985-07-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS6158811B2 (en) | ||
| JPS6158809B2 (en) | ||
| RU2204155C2 (en) | Optical insulator | |
| US5267078A (en) | Optical isolator | |
| JP2943436B2 (en) | Semiconductor laser module | |
| JPH03261191A (en) | Laser amplifying system | |
| JPH0668585B2 (en) | Optical isolator | |
| JPH0668584B2 (en) | Optical isolator | |
| JP2930431B2 (en) | Polarization-independent optical isolator | |
| JP3317999B2 (en) | Optical isolator | |
| JP2747775B2 (en) | Optical isolator | |
| JP3716981B2 (en) | Optical isolator | |
| JPH0743640A (en) | Polarization independence type optical isolator | |
| JP2777262B2 (en) | Optical isolator device | |
| EP0492437B1 (en) | Polarization independent optical isolator | |
| JPH0474689B2 (en) | ||
| JPS63219186A (en) | Semiconductor laser module with built-in optical isolator | |
| DE3929794A1 (en) | Fibre=optic light source module in four-way multiplexer on common axes - uses four laser-diodes focussed through 3 dB beam splitters to add signals at output signals | |
| JPS59184584A (en) | Semiconductor laser module | |
| JPS60233606A (en) | Optical device for incidence on plural optical fibers | |
| JPS5750335A (en) | Optical information reproducer | |
| JPS58203412A (en) | Branching device of polarization plane preserving optical fiber type | |
| JPH0358086B2 (en) | ||
| JPH0833523B2 (en) | Polarization maintaining optical isolator | |
| JPS6059318A (en) | Optical demultiplexer multiplexer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |