JPH0558529B2 - - Google Patents
Info
- Publication number
- JPH0558529B2 JPH0558529B2 JP61089149A JP8914986A JPH0558529B2 JP H0558529 B2 JPH0558529 B2 JP H0558529B2 JP 61089149 A JP61089149 A JP 61089149A JP 8914986 A JP8914986 A JP 8914986A JP H0558529 B2 JPH0558529 B2 JP H0558529B2
- Authority
- JP
- Japan
- Prior art keywords
- comb
- electrodes
- light
- polarization control
- control device
- 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 - Lifetime
Links
- 230000010287 polarization Effects 0.000 claims description 30
- 239000000758 substrate Substances 0.000 claims description 13
- 230000003287 optical effect Effects 0.000 description 10
- 230000001902 propagating effect Effects 0.000 description 8
- 239000000835 fiber Substances 0.000 description 7
- 238000004891 communication Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 238000000206 photolithography Methods 0.000 description 2
- 229910013641 LiNbO 3 Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明により偏光制御デバイスは、光通信シス
テムや光フアイバセンサ等に利用される。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) A polarization control device according to the present invention is used in optical communication systems, optical fiber sensors, and the like.
（従来の技術）
光ヘテロダイン通信システムや光フアイバジヤ
イロなどの光センサ等において、任意の偏光状態
の光をある一定の偏光状態の光に変換する偏光制
御は重要である。特に単一モードフアイバを用い
た光ヘテロダイン通信システムにおいて、光ヘテ
ロダイン検波を行う際信号光の偏光状態と局部発
振光の偏光状態が一致していることが必要とされ
る。ところが、温度変化などの外乱により単一モ
ードフアイバ伝搬後の信号光の偏光状態が変化す
るため、ビート信号光強度が変動し、システムの
信頼性の低下を招き、場合により信号検出が不能
となることもある。そこで信頼性確保のために、
信号光と局部発振光の偏光状態を一致させる偏光
制御装置が必要不可欠となる。特にそれらに用い
られるデバイスは、小型化、信頼性向上等のため
に電気光学効果を用いたものが望まれる。(Prior Art) Polarization control, which converts light in an arbitrary polarization state into light in a certain polarization state, is important in optical heterodyne communication systems, optical sensors such as fiber optic coils, and the like. In particular, in an optical heterodyne communication system using a single mode fiber, when performing optical heterodyne detection, it is necessary that the polarization state of the signal light and the polarization state of the local oscillation light match. However, because the polarization state of the signal light after propagating through a single-mode fiber changes due to disturbances such as temperature changes, the beat signal light intensity fluctuates, leading to a decrease in system reliability and, in some cases, making signal detection impossible. Sometimes. Therefore, to ensure reliability,
A polarization control device that matches the polarization states of the signal light and the local oscillation light is essential. In particular, devices using electro-optic effects are desired for miniaturization, improved reliability, and the like.
従来、電気光学効果を用いた偏光制御デバイス
として、貴堂らにより電子通信学会論文誌、J68
−Ｃ巻、1985年、79ページから86ページにおいて
発表されたものがある。これは、LiNCbO3基板
の両表面上に対向する一対の電極を設けた２個の
バルク型位相変調器において、電圧により最大屈
折率変化の生じる方向を互いに45度傾けた状態
で、それらを直列に接続したものである。このよ
うな構成により、入射光の偏光状態を任意の状態
からある一定の直線偏光に変換することができ
る。 Conventionally, a polarization control device using the electro-optic effect has been proposed by Kido et al., Transactions of the Institute of Electronics and Communication Engineers, J68.
- Volume C, 1985, pages 79 to 86. This is achieved by connecting two bulk phase modulators with a pair of opposing electrodes on both surfaces of a LiNCbO 3 substrate in series, with the directions in which the maximum refractive index changes due to voltage are tilted 45 degrees to each other. It is connected to. With such a configuration, the polarization state of incident light can be converted from an arbitrary state to a certain fixed linear polarization state.
（発明が解決しようとする問題点）
上述の偏光制御デバイスを作製するには、２個
の位相変調器を作製し、それらを互いに45度傾け
て配置し、さらに入射光が２個の位相変調器を通
過するように光学調整しなければならない。(Problem to be Solved by the Invention) In order to manufacture the above-mentioned polarization control device, two phase modulators are manufactured, they are arranged at a 45-degree angle to each other, and the incident light has two phase modulators. The optical adjustment must be made so that the light passes through the vessel.
以上の光学調整には大くの工数を要し、デバイ
スの生産性が著しく低下する。また、２個の位相
変調器間には接合部分が存在するが、この接合部
分は経時変化する可能性があり、信頼性にも問題
がある。 The above optical adjustment requires a large number of man-hours, and the productivity of the device is significantly reduced. Further, although there is a joint between the two phase modulators, this joint may change over time, and there is also a problem in reliability.
本発明が解決しようとする問題点は、上述の従
来の偏光制御デバイスにおける生産性の低さ及び
信頼性の低さである。 The problem to be solved by the present invention is the low productivity and low reliability of the above-mentioned conventional polarization control devices.
（問題点を解決するための手段）
前述の問題点を解決するために本願の第１の発
明が提供する偏光制御デバイスは、PLZT基板と
該PLZT基板の第１の表面上に設けられた第１の
くし型電極と、前記第１の表面に対向する第２の
表面上に、前記第１のくし型電極と方法が互いに
およそ45度傾いた状態で設けられた第２のくし型
電極とを含むことを特徴とする。(Means for Solving the Problems) In order to solve the above-mentioned problems, the polarization control device provided by the first invention of the present application includes a PLZT substrate and a polarization control device provided on the first surface of the PLZT substrate. a second comb-shaped electrode provided on a second surface opposite to the first surface with the first comb-shaped electrode and the second comb-shaped electrode tilted approximately 45 degrees to each other; It is characterized by including.
前述の問題点を解決するために本願の第２の発
明が提供する偏光制御デバイスは、PLZT基板
と、該PLZT基板の第１の表面上に互いにある一
定の間隔をおいて設けられた第１の電極対と、前
記第１の表面に対向する第２の表面上に、前記第
１の電極対と方向が互いにおよそ45度傾いた状態
で互いにある一定の間隔をおいて設けられた第２
の電極対とを含むことを特徴とする。 In order to solve the above-mentioned problems, a polarization control device provided by the second invention of the present application includes a PLZT substrate, and a first polarization control device provided on a first surface of the PLZT substrate at a certain distance from each other. a pair of electrodes, and a second electrode provided on a second surface opposite to the first surface at a certain distance from each other with directions inclined at approximately 45 degrees to the first electrode pair.
and a pair of electrodes.
（作用）
本願の第１及び第２の発明に用いるPLZTはセ
ラミツクであるからLiNbO3などの光学結晶と異
なり、電気光学効果はすべての方向に一様であ
り、電界方向にのみ屈折率が変化する。したがつ
て、１枚のPLZT基板の互いに対向する２つの表
面上に、それぞれくし型電極をそれらの方向が互
いに45度傾いた状態で設けるだけで、電圧により
最大屈折率変化の生じる方向が互いに45度傾いた
状態で配置された２個の位相変調器すなわち偏光
制御デバイスが構成できる。ここで、２つの電極
の方向を互いにある角度に設定するのは、従来の
フオトリソグラフイ技術により容易に行うことが
できる。したがつて、２個の位相変調器を位置調
整する必要がなく、入射光もくし型電極にほぼ垂
直に入射させるだれでよい。このように本デバイ
スは簡単な構造であるから生産性が高い。(Function) Since PLZT used in the first and second inventions of the present application is a ceramic, unlike optical crystals such as LiNbO 3 , the electro-optic effect is uniform in all directions, and the refractive index changes only in the direction of the electric field. do. Therefore, by simply providing comb-shaped electrodes on two opposing surfaces of a single PLZT substrate with their directions tilted 45 degrees to each other, the directions in which the maximum refractive index change occurs due to voltage can be aligned with each other. Two phase modulators or polarization control devices placed at a 45 degree angle can be constructed. Here, the orientation of the two electrodes can be easily set at a certain angle with respect to each other using conventional photolithography techniques. Therefore, there is no need to adjust the positions of the two phase modulators, and the incident light may be incident almost perpendicularly to the comb-shaped electrodes. Since this device has a simple structure as described above, productivity is high.
また、２個の位相変調器は同一基板上に作製さ
れているので、それらの間に接合部が存在せず、
このデバイスの信頼性も高い。 In addition, since the two phase modulators are fabricated on the same substrate, there is no joint between them.
This device is also highly reliable.
（実施例）
以下に本願発明について、図面を参照して詳細
に説明する。(Example) The present invention will be described in detail below with reference to the drawings.
第１図ａおよびｂはそれぞれ本願の第１の発明
の一実施例である偏光制御デバイスを示す斜視図
および側面図である。 FIGS. 1a and 1b are a perspective view and a side view, respectively, showing a polarization control device that is an embodiment of the first invention of the present application.
PLZT基板１００の第１および第２の表面１０
１，１０１′上に、それぞれ第１および第２のく
し型電極１０２，１０２′が設けてある。ここで、
第１および第２のくし型電極１０２，１０２′は
電極の方向が互いに45度傾いた状態で設けられて
いる。第１および第２のくし型電極１０２，１０
２′には、それぞれ第１および第２のリード端子
対１０３，１０３′が接続されている。また、第
１および第２のくし型電極１０２，１０２′の表
面には、それぞれ第１および第２のレンズ１０
４，１０４′が設けられている第１および第２の
レンズ１０４，１０４′において、それぞれ第１
および第２のくし型電極１０２，１０２′が接し
ていない側の端面には、第１および第２の単一モ
ードフアイバー１０５，１０５′が接続されてい
る。ここで第１および第２のくし型電極１０２，
１０２′はITO透明電極である。 First and second surfaces 10 of PLZT substrate 100
First and second comb-shaped electrodes 102, 102' are provided on the electrodes 1, 101', respectively. here,
The first and second comb-shaped electrodes 102, 102' are provided with their electrode directions inclined at 45 degrees with respect to each other. First and second comb-shaped electrodes 102, 10
2' are connected to first and second lead terminal pairs 103 and 103', respectively. Furthermore, first and second lenses 10 are formed on the surfaces of the first and second comb-shaped electrodes 102 and 102', respectively.
In the first and second lenses 104, 104' provided with lenses 4, 104', the first
First and second single mode fibers 105, 105' are connected to the end face on the side not in contact with the second comb-shaped electrodes 102, 102'. Here, the first and second comb-shaped electrodes 102,
102' is an ITO transparent electrode.
第１の単一モードフアイバー１０５を伝搬して
きた任意の偏光状態の光は、第１のレンズ１０４
に入射して平行光化された後PLZT基板１００に
入射する。第１および第２のリード端子対１０
３，１０３′に適当な電圧を印加することによつ
て生じた電気光学効果により、まず第１のくし型
電極１０２部分で伝搬光におけるＰ偏光とＳ偏光
の位相差はπ／２に変換される。続いて第２のく
し型電極１０２′部分で伝搬光はある一定の直線
偏光に変換される。このようにして得られた伝搬
光は第２のレンズ１０４′により集光されて、第
２の単一モードフアイバー１０５′に結合される。 Light of any polarization state propagating through the first single mode fiber 105 is transmitted through the first lens 104.
After being made into parallel light, the light enters the PLZT substrate 100. First and second lead terminal pair 10
Due to the electro-optic effect produced by applying an appropriate voltage to 3,103', the phase difference between the P-polarized light and the S-polarized light in the propagating light is converted to π/2 at the first comb-shaped electrode 102. Ru. Subsequently, the propagating light is converted into a certain linearly polarized light at the second comb-shaped electrode 102'. The propagating light thus obtained is focused by a second lens 104' and coupled to a second single mode fiber 105'.
以上で述べた偏光制御デバイスにより得られた
伝搬光の偏光状態を検出して、その信号により第
１および第２のリード端子対１０３，１０３′に
それぞれ必要な駆動電圧を印加するフイードバツ
ク制御系を備えることにより、伝搬光の偏光状態
の自動制御が可能となる。 A feedback control system is provided which detects the polarization state of the propagating light obtained by the polarization control device described above, and uses the detected signal to apply necessary driving voltages to the first and second lead terminal pairs 103 and 103'. By providing this, automatic control of the polarization state of propagating light becomes possible.
第２図は本願の第２の発明の一実施例を示す斜
視図である。第１図の実施例における第１および
第２のくし型電極１０２，１０２′に代えて、そ
れぞれ第２図に示すたうな互いにある一定の間隔
をおいて設けられた第１および第２の電極対２０
０，２００′を用いてもよい。第１および第２の
電極対２００，２００′は、くし型電極の場合と
同様に互いに45度傾けた状態で設ける。伝搬光は
それぞれ第１および第２の電極対２００，２０
０′の間を通過するように入射させる。この変形
例における電極形状は、くし型電極に比べて簡単
であるからフオトリソグラフイ技術を用いた電極
形成が容易となる。また、電極は透明電極でな
く、より形成が容易なAl，Auなどの金属電極で
もよい。 FIG. 2 is a perspective view showing an embodiment of the second invention of the present application. Instead of the first and second comb-shaped electrodes 102, 102' in the embodiment of FIG. 1, first and second electrodes as shown in FIG. 2 are provided at a certain distance from each other, respectively. vs. 20
0.200' may also be used. The first and second electrode pairs 200, 200' are provided at an angle of 45 degrees with respect to each other, similar to the case of interdigitated electrodes. The propagating light is transmitted through the first and second electrode pairs 200 and 20, respectively.
0'. Since the electrode shape in this modification is simpler than the comb-shaped electrode, it is easier to form the electrode using photolithography technology. Furthermore, the electrodes are not transparent electrodes, but may be metal electrodes such as Al, Au, etc., which are easier to form.
（発明の効果）
本願の第１及び第２の発明による偏光制御デバ
イスは、１枚のPLZT基板の互いに対向する２つ
の表面上に、それぞれくし型電極、または互いに
ある一定の間隔をおいて設けられた電極対をそれ
らの方向が互いに45度傾いた状態で設けるだけで
よく、作製が容易であり、光学調整を必要としな
い。したがつて、この偏光制御デバイスを用いる
ことにより、安価で信頼性の高い偏光制御装置を
容易に作製できるので、光通信システムや光フア
イバセンサ等の低価格化、高信頼化を図ることが
できる。(Effects of the Invention) The polarization control devices according to the first and second inventions of the present application are provided with comb-shaped electrodes or at a certain distance from each other on two mutually opposing surfaces of one PLZT substrate. It is only necessary to provide a pair of electrodes with their directions tilted at 45 degrees with respect to each other, making it easy to manufacture and requiring no optical adjustment. Therefore, by using this polarization control device, an inexpensive and highly reliable polarization control device can be easily produced, which can lead to lower costs and higher reliability of optical communication systems, optical fiber sensors, etc. .
第１図ａおよびｂはそれぞれ本願の第１の発明
の一実施例である偏光制御デバイスの斜視図およ
び側面図、第２図は本願の第２の発明の一実施例
を示す斜視図である。
１００……PLZT基板、１０１，１０１′……
表面、１０２，１０２′……くし型電極、１０３，
１０３′……リード端子対、１０４，１０４′……
レンズ、１０５，１０５′……単一モードフアイ
バ、２００，２００′……電極対。
1A and 1B are respectively a perspective view and a side view of a polarization control device which is an embodiment of the first invention of the present application, and FIG. 2 is a perspective view showing an embodiment of the second invention of the present application. . 100...PLZT board, 101, 101'...
Surface, 102, 102'...Comb-shaped electrode, 103,
103'... Lead terminal pair, 104, 104'...
Lens, 105, 105'...single mode fiber, 200, 200'...electrode pair.
Claims (1)
に設けられた第１のくし型電極と、前記第１の表
面に対向する第２の表面上に、前記第１のくし型
電極と方向が互いにおよそ45度傾いた状態で設け
られた第２のくし型電極とを含むことを特徴とす
る偏光制御デバイス。 ２ PLZT基板と、該PLZT基板の第１の表面上
に互いにある一定の間隔をおいて設けられた第１
の電極対と、前記第１の表面に対向する第２の表
面上に、前記第１の電極対と方向が互いにおよそ
45度傾いた状態で、互いにある一定の間隔をおい
て設けられた第２の電極対とを含むことを特徴と
する偏光制御デバイス。[Claims] 1. A PLZT substrate, a first comb-shaped electrode provided on a first surface of the PLZT substrate, and a first comb-shaped electrode provided on a second surface opposite to the first surface. 1. A polarization control device comprising: a comb-shaped electrode; and a second comb-shaped electrode, the directions of which are inclined at approximately 45 degrees to each other. 2 a PLZT substrate and a first
a pair of electrodes on a second surface opposite to the first surface, the first pair of electrodes having directions approximately relative to each other;
A polarization control device comprising: a second pair of electrodes that are inclined at 45 degrees and spaced apart from each other by a certain distance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8914986A JPS62245214A (en) | 1986-04-17 | 1986-04-17 | Polarization control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8914986A JPS62245214A (en) | 1986-04-17 | 1986-04-17 | Polarization control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62245214A JPS62245214A (en) | 1987-10-26 |
| JPH0558529B2 true JPH0558529B2 (en) | 1993-08-26 |
Family
ID=13962806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8914986A Granted JPS62245214A (en) | 1986-04-17 | 1986-04-17 | Polarization control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62245214A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007158020A (en) * | 2005-12-05 | 2007-06-21 | Ricoh Co Ltd | Optical element |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57161830A (en) * | 1981-03-31 | 1982-10-05 | Yokogawa Hokushin Electric Corp | Optical changeover switch |
-
1986
- 1986-04-17 JP JP8914986A patent/JPS62245214A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57161830A (en) * | 1981-03-31 | 1982-10-05 | Yokogawa Hokushin Electric Corp | Optical changeover switch |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62245214A (en) | 1987-10-26 |
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