JPS5897994A - Switch for exchange - Google Patents
Switch for exchangeInfo
- Publication number
- JPS5897994A JPS5897994A JP19627981A JP19627981A JPS5897994A JP S5897994 A JPS5897994 A JP S5897994A JP 19627981 A JP19627981 A JP 19627981A JP 19627981 A JP19627981 A JP 19627981A JP S5897994 A JPS5897994 A JP S5897994A
- Authority
- JP
- Japan
- Prior art keywords
- optical
- switch
- elements
- photodetector
- light
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
- H04Q3/52—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using static devices in switching stages, e.g. electronic switching arrangements
- H04Q3/526—Optical switching systems
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
Abstract
Description
【発明の詳細な説明】
(技術分野)
本発明は電気通信における広帯域交換用スイッチに関す
るものである。TECHNICAL FIELD This invention relates to broadband switching switches in telecommunications.
(背景技術)
従来第1図に示すような光回路と電子回路を組み合せた
広帯域の交換用スイッチが報告されている。(E、H,
Hara 、 S 、Machida 、 M、Ike
da 、 H,Kanbeand T、Kimura
、 Electronics Letters、 vo
117.pp150−151(1981)) 第1図
は3×3スイツチの構成例であって、11〜13は入力
端子、21〜23は電気/光変換素子、31〜33は光
入射端が1で光出射端が3の(IX3)光分岐回路、4
1.〜433は光検出器、531は光検出器駆動回路(
51,〜5.3,5□1〜52.。(Background Art) A wideband replacement switch that combines an optical circuit and an electronic circuit as shown in FIG. 1 has been reported. (E, H,
Hara, S., Machida, M., and Ike.
da, H, Kanbeand T, Kimura
, Electronics Letters, vo
117. pp150-151 (1981)) Figure 1 shows an example of the configuration of a 3x3 switch, in which 11 to 13 are input terminals, 21 to 23 are electrical/optical conversion elements, and 31 to 33 have a light input end of 1 and a light input terminal. (IX3) optical branch circuit with 3 output ends, 4
1. ~433 is a photodetector, 531 is a photodetector drive circuit (
51,~5.3,5□1~52. .
532 y りssに相当する光検出器駆動回路は図で
は省略しである)、6.〜63は増幅器、7.〜7sは
出力端子である。(The photodetector drive circuit corresponding to 532 y ss is omitted in the figure), 6. ~63 is an amplifier; 7. ~7s is an output terminal.
入力端子1.と出力端子72を接続する場合の動作を説
明する。入力端子1.に入力された電気信号は、電気/
光変換素子によって光信号に変換されて光分岐口3Iの
光入射端に入力される。光分岐回路3.の光信号は分岐
され三つの光出射端から光検出器411 + 412
+ 413に同時に入力される。光検出器4+1 +
412 + 4+sに接続されている光検出器駆動回路
511 + 51□、513は常時オフ状態で待機して
おり光検出器41H412+ 413は動作していない
が、光検出器駆動回路5.2のみオン状態にすると光検
出器412が動作して光信号が電気信号に変換され、更
に増幅器62で所定の電圧まで増幅された電気信号が出
力端子7□に送られろ。このようにして入力端子11と
出力端子72が接続されるが、他の入力端子1゜(l=
1〜3)と出力端子7.(コー1〜3)も同様にして接
続できる。Input terminal 1. The operation when connecting the output terminal 72 and the output terminal 72 will be explained. Input terminal 1. The electrical signal input to
The light is converted into an optical signal by the optical conversion element and input to the light input end of the optical branch port 3I. Optical branch circuit 3. The optical signal is branched and sent from three light output ends to photodetectors 411 + 412
+413 is input at the same time. Photodetector 4+1 +
The photodetector drive circuits 511+51□ and 513 connected to 412+4+s are always off and waiting, and the photodetectors 41H412+413 are not operating, but only the photodetector drive circuit 5.2 is on. When the state is set, the photodetector 412 operates to convert the optical signal into an electrical signal, and the electrical signal is amplified to a predetermined voltage by the amplifier 62 and sent to the output terminal 7□. In this way, the input terminal 11 and the output terminal 72 are connected, but the other input terminal 1° (l=
1 to 3) and output terminal 7. (Cores 1 to 3) can also be connected in the same manner.
この交換用スイッチでは光検出器411〜433にスイ
ッチ機能と光/電気変換機能を行わせているため、閾値
特性が優れた特殊な光検出器を必要とする欠点がある。In this replacement switch, since the photodetectors 411 to 433 perform the switching function and the optical/electrical conversion function, there is a drawback that a special photodetector with excellent threshold characteristics is required.
また入力端子数Nで出力端子数NのスイッチではN2個
の大量の光検出器(例えば1(l X InスイJチで
は100個)を必要とするため製造が困難であり高価に
なる欠点がある。In addition, a switch with N input terminals and N output terminals requires a large number of N2 photodetectors (for example, 1 (100 for a lxin switch)), which has the disadvantage of being difficult and expensive to manufacture. be.
(発明の開示)
本発明はこれらの欠点を除去するため光間閉スイッチを
利用した広帯域の交換用スイッチを提供するもので、そ
の特徴は、N個(Nは自然数)の入力端子の各々に接続
されるN個の電気/光変換素子と、その各々の出力に接
続されるN個のIXM光分岐回路と、列方向にM個(M
は自然数)で行方向にN個の光間閉スイッチ素子を有す
るM x N光間閉スイッチマトリクスとを有し、N個
の各光分岐回路がN列の光間閉スイッチ素子に対応して
、各光分岐回路毎にM個の光出射端がM行の光間閉スイ
ッチ素子の各々に入力され、さらに、M行の光間閉スイ
ッチ素子の各行に対応してもうけられN列の各党開閉ス
イッチ素子の出力に接続されるM個のN×1光合流回路
と、各党合流回路の出力に接続され、M個の出力端子に
結合するM個の電気/光変換素子とが具備され、光間閉
スイッチマトリクスの各構成素子の選択的駆動により各
入力端子を所望の出力端子に接続するごとき交換用ス。(Disclosure of the Invention) In order to eliminate these drawbacks, the present invention provides a broadband replacement switch using an optical interlocking switch. N electrical/optical conversion elements connected, N IXM optical branch circuits connected to their respective outputs, and M (M
is a natural number), and has an M x N optical closing switch matrix having N optical closing switching elements in the row direction, and each of the N optical branch circuits corresponds to an N column of optical closing switching elements. , for each optical branch circuit, M light emitting ends are input to each of the M rows of optical inter-closing switch elements, and furthermore, M light emitting ends are input to each of the M rows of optical inter-closing switch elements, and each of the N columns is provided corresponding to each row of the M rows of optical inter-closing switch elements. M N×1 optical merging circuits connected to the outputs of the open/close switch elements, and M electrical/optical conversion elements connected to the outputs of the respective merging circuits and coupled to the M output terminals, A replacement switch that connects each input terminal to a desired output terminal by selectively driving each component of the optically closed switch matrix.
イッチにある。It's on it.
(発明を実施するための最良の形態)
第2図は本発明の実施例であって3×3スイツチの構成
例である。8は3×3光開閉スイツチ(811〜833
はマトリクス状に配置した光間閉スイッチ素子)、91
〜93は3×1光合流回路、101〜1()3 は光検
出器である。光合波回路97,9□、93は三つの光入
射端に入力された光を出射端に導く作用をする。(BEST MODE FOR CARRYING OUT THE INVENTION) FIG. 2 shows an embodiment of the present invention, and is a configuration example of a 3×3 switch. 8 is a 3x3 optical open/close switch (811-833
is an optical switching element arranged in a matrix), 91
-93 are 3x1 light combining circuits, and 101-1()3 are photodetectors. The optical multiplexing circuits 97, 9□, and 93 function to guide the light input to the three light input ends to the output end.
電気/光変換素子2k(k=1〜3)を光分岐回路共と
結合する。光分岐回路3にの三つの光出射端を3×3光
開閉スイツチ8の光間閉スイッチ素子8k118に21
8に3と結合する。光合波回路91(A’=1〜3)の
三つの光入射端を光間閉スイッチ素子8+J T821
F8slと結合し、光出射端を光検出器10Jと結合す
る。The electric/optical conversion element 2k (k=1 to 3) is coupled to the optical branch circuit. The three light output ends of the optical branch circuit 3 are connected to the optical closing switch element 8k118 of the 3×3 optical opening/closing switch 8 (21).
Combine 8 with 3. The three light input ends of the optical multiplexing circuit 91 (A'=1 to 3) are connected to the optical closing switch element 8+J T821
F8sl, and the light emitting end is connected to the photodetector 10J.
入力端子1.と出力端子72を接続する場合の動作を説
明する。入力端子1.に入力された電気信号は電気/光
変換素子2.で光信号に変換され光分岐回路31を介し
て光間閉スイッチ素子811 + 812 + sts
に同時に入力される。光間閉スイッチ素子811〜8,
3は常時閉状態で待機しており、光合波回路91,9□
。Input terminal 1. The operation when connecting the output terminal 72 and the output terminal 72 will be explained. Input terminal 1. The electrical signal input to the electrical/optical conversion element 2. is converted into an optical signal and passed through the optical branch circuit 31 to the optical switching element 811 + 812 + sts
are input simultaneously. Optical close switch elements 811-8,
3 is always closed and waiting, and the optical multiplexing circuit 91, 9□
.
9、には光信号が送られていないが、光間閉スイッチ素
子8□2を開状態にすると光信号は光合波回路92を介
して光検出器102に到達し、電気信号に変換され、増
幅器62で所定の電圧に増幅されて出力端子72に送ら
れる。このようにして入力端子1と出力端子72が接続
されるが、同様にして他の入力端子1□(i=1〜3)
と出力端子7j(j=1〜3)も接続できる。Although no optical signal is sent to 9, when the optical closing switch element 8□2 is opened, the optical signal reaches the photodetector 102 via the optical multiplexing circuit 92 and is converted into an electrical signal. The voltage is amplified to a predetermined voltage by the amplifier 62 and sent to the output terminal 72. In this way, input terminal 1 and output terminal 72 are connected, but in the same way, other input terminals 1□ (i=1 to 3)
and output terminal 7j (j=1 to 3) can also be connected.
以上3×3交換用スイツチの構成を説明したが、同様に
してN個の電気/光変換素子、N個のIXN光分岐回路
、NxN個の光間閉スイッチ素子からなるNxN光開開
開閉スイツチ個のNxl光合流回路、N個の光検出器、
N個の増幅器を用いてNxN交換用スイッチを製作でき
る。The configuration of the 3x3 replacement switch has been explained above, and in the same way, an NxN optical opening/closing switch consisting of N electrical/optical conversion elements, N IXN optical branch circuits, and NxN optical inter-optical switching elements has been described. Nxl light combining circuits, N photodetectors,
N×N switching switches can be fabricated using N amplifiers.
第3図(a)〜(C)は3×3光開閉スイツチ8の実施
例であって電気光学効果を利用したものである。FIGS. 3(a) to 3(C) show examples of a 3×3 optical on/off switch 8 that utilizes the electro-optic effect.
(a)は正面図、(blは側面図、(C)は斜視図であ
る。11はLiNbO3,KDP 、 (3aAsなど
の電気光学結晶板、12は偏光子、13は検光子、14
2.〜1433は光開閉スインチ素子811〜833の
位置に設けた電気光学結晶板11表面上の透明電極、1
5は電気光学結晶板1】裏面の全面に設けた透明電極で
ある。(a) is a front view, (bl is a side view, and (C) is a perspective view. 11 is an electro-optic crystal plate such as LiNbO3, KDP, (3aAs), 12 is a polarizer, 13 is an analyzer, 14
2. -1433 are transparent electrodes on the surface of the electro-optic crystal plate 11 provided at the positions of the optical opening/closing switch elements 811-833;
Reference numeral 5 denotes a transparent electrode provided on the entire back surface of the electro-optic crystal plate 1.
透明電極144.〜1433と透明電極150間に電圧
を印加したときの結晶の主軸をy軸方向にとり、偏光子
12の偏光方向をy軸から一45度にとり、検光子12
の偏光方向をy軸から+45度にとる。このようにする
と電圧無印加時には透過光が零になり、光開閉スイッチ
素子81.〜833は閉状態になる。−実電圧印加時の
透過光量Iは次式で表わされろ。Transparent electrode 144. 1433 and the transparent electrode 150, the main axis of the crystal is set in the y-axis direction, the polarization direction of the polarizer 12 is set at 145 degrees from the y-axis, and the analyzer 12
The polarization direction of is set at +45 degrees from the y-axis. In this way, the transmitted light becomes zero when no voltage is applied, and the light switching element 81. ~833 is in a closed state. -The amount of transmitted light I when an actual voltage is applied is expressed by the following formula.
1−I、 5in2(πΔnd/λ)
ここで■。は偏光子12通過直後の光量、Δnは電圧印
加時のy軸方向とX軸方向の屈折率差、dは電気光学結
晶板の厚さ、λは光の波長である。1-I, 5in2 (πΔnd/λ) where ■. is the amount of light immediately after passing through the polarizer 12, Δn is the difference in refractive index between the y-axis direction and the x-axis direction when voltage is applied, d is the thickness of the electro-optic crystal plate, and λ is the wavelength of the light.
πΔnd/λ=π/2 になるように設定すれば最も消
光比の良い透過光が得られる。このようにして電圧印加
時には光開閉スイッチ素子は開状態になる。所望の透明
電極141.〜1433に電圧を印加すれば所望の光開
閉スイッチ素子が開状態になる。By setting πΔnd/λ=π/2, transmitted light with the best extinction ratio can be obtained. In this manner, the optical switching element is in an open state when a voltage is applied. Desired transparent electrode 141. When a voltage is applied to 1433, a desired optical switching element is brought into an open state.
第4図(a)及び(blは3×3光開閉スイツチ8の他
の実施例であって液晶を利用したものである。(a)は
正面図、(b)は側面図である。16は液晶封入用のガ
ラス板、17はガラス板16の表面全面に設けた透明電
極、18は骸晶封入用のガラス板、1911〜1933
は光開閉スイッチ素子8,1〜833の位置に設けたガ
ラス基板18表面上の透明電極、20は液晶、21は偏
光子、22は検光子である。液晶20にはネマチック液
晶を用いる。透明電極170表面および透明電極195
.〜1933 を含むガラス板18の表面には液晶分
子の配向を規定するための平行配向処理を施しである。FIGS. 4(a) and 4(bl) show another embodiment of the 3×3 optical on/off switch 8, which uses a liquid crystal.(a) is a front view, and (b) is a side view.16 17 is a transparent electrode provided on the entire surface of the glass plate 16; 18 is a glass plate for encapsulating a skeleton crystal; 1911-1933
20 is a liquid crystal, 21 is a polarizer, and 22 is an analyzer. A nematic liquid crystal is used for the liquid crystal 20. Transparent electrode 170 surface and transparent electrode 195
.. The surface of the glass plate 18 including .about.1933 is subjected to parallel alignment treatment to define the alignment of liquid crystal molecules.
平行配向処理法としては、液晶表示製造で通常行われて
いるうてソゲ法や斜め蒸着法を用いることができる。透
明電極17の表面では液晶分子の長軸をX軸方向に、又
ガラス板180表面ではy軸方向に配向しておく。偏光
子21と検光子22の偏光方向をX軸方向にしておく。As the parallel alignment treatment method, a vertical evaporation method or an oblique evaporation method, which is commonly used in the manufacture of liquid crystal displays, can be used. The long axes of liquid crystal molecules are oriented in the X-axis direction on the surface of the transparent electrode 17, and in the y-axis direction on the surface of the glass plate 180. The polarization directions of the polarizer 21 and the analyzer 22 are set in the X-axis direction.
透明電極17と1911〜19330間菱電圧を印加し
ないときは、液晶分子の長軸方向が透明電極17かもガ
ラス板180間でy軸からy軸方向へと90°回転して
いるため、入射光の偏光方向も90°回転する。そのた
め偏光子21、液晶20を通過した光の偏光方向は検光
子22の偏光方向と直交するので光は透過されない。一
方電圧を印加すると液晶分子は全てZ軸方向に揃うため
、入射光は偏光方向に何の影響も受けずそのまま通過す
る。そのため偏光子21、液晶20を通った光はそのま
ま検光子22を透過する。従って透明電極】9,1〜1
’J33への電圧印加の有無によって光開閉スイッチを
開あるいは閉状態にできる。When no rhombic voltage is applied between the transparent electrode 17 and 1911 to 19330, the long axis direction of the liquid crystal molecules is rotated by 90° from the y-axis to the y-axis between the transparent electrode 17 and the glass plate 180, so that the incident light is The polarization direction of is also rotated by 90°. Therefore, the polarization direction of the light that has passed through the polarizer 21 and the liquid crystal 20 is perpendicular to the polarization direction of the analyzer 22, so that no light is transmitted. On the other hand, when a voltage is applied, all the liquid crystal molecules are aligned in the Z-axis direction, so the incident light passes through without being affected by the polarization direction. Therefore, the light that has passed through the polarizer 21 and the liquid crystal 20 passes through the analyzer 22 as is. Therefore, transparent electrode】9,1~1
'The optical switching switch can be opened or closed depending on whether or not a voltage is applied to J33.
以上本発明の詳細な説明した。電気/光変換素子には、
例えばA I (jaA sあるいは1nQaAsP
による可視光から近赤外光までの半導体レーザや発光
ダイオードを使用できろ。光検出器は、電気/光変換素
子の波長に応じて(ie、 Si 、 1nGaAsP
によるアバランシェフォトダイオードやフォトダイオー
ド等が使用できる。光開閉スイッチ素子としては上記説
明のもの以外にZnS膜の紫外線照射による吸収端シフ
ト(T、Matsui and K、’l’oyoda
、JapanJ ournal of Appl ic
d Pr+ysics、 vol、 12pp625−
626(1973))ベノ半導体におけるフランツケル
ディシコ効果による吸収端シフト(例えば、L’、K
、Re1nhart、Appl 1edPhysics
Letters、 vol 22+ pp372−3
74(1973))の利用も可能である。なお、光開閉
スイッチ素子には通過帯域を制限する要因が存在しない
ので容易に500MHz以上の帯域をとり得ろ。The present invention has been described in detail above. Electrical/optical conversion elements include
For example, A I (jaA s or 1nQaAsP
It is possible to use semiconductor lasers and light emitting diodes that emit light from visible light to near-infrared light. The photodetector is composed of (ie, Si, 1nGaAsP) depending on the wavelength of the electrical/optical conversion element.
An avalanche photodiode, a photodiode, etc. can be used. In addition to the above-mentioned optical switching elements, absorption edge shift of ZnS film due to ultraviolet irradiation (T, Matsui and K, 'l'oyoda)
, Japan Journal of Applic
d Pr+ysics, vol, 12pp625-
626 (1973)) Absorption edge shift due to the Franz-Keldichko effect in Beno semiconductors (e.g. L', K
, Re1nhart, Appl 1ed Physics
Letters, vol 22+ pp372-3
74 (1973)) is also available. Note that since there is no factor that limits the pass band in the optical switching element, it can easily have a band of 500 MHz or more.
(発明の効果)
以上説明したように本発明はスイッチ機能と光/電気変
換機能を分離したことにより、スイッチ機能をもつ光開
閉スイッチと光/電気変換機能をもつ光検出器に特殊な
ものを必要とせず製造しやすい利点がある。すなわち光
開閉スイッチには通常の光変調に用いられている部品を
利用することができ、光検出器には閾値特性がないもの
あるいは良好でないものが使用できる。また広帯域交換
用スイッチの中で大きな比重を占める高価な光検出器を
従来のN2個からN個まで減らせるため極めて経済的に
なる利点がある。また光を利用して交換を行っているの
で、従来の電磁スイッチの帯域を制限している浮遊容量
に相当するものが無(、容易に500M)(z以上の広
帯域が得られる。(Effects of the Invention) As explained above, the present invention separates the switch function and the optical/electrical conversion function, thereby providing a special optical opening/closing switch with the switching function and a photodetector with the optical/electrical conversion function. It has the advantage of not being necessary and easy to manufacture. In other words, parts used for normal optical modulation can be used for the optical switch, and a photodetector that does not have a threshold characteristic or has poor threshold characteristics can be used. Furthermore, the number of expensive photodetectors, which occupy a large proportion of the broadband exchange switch, can be reduced from N2 to N, which has the advantage of being extremely economical. Furthermore, since the exchange is performed using light, there is no stray capacitance that limits the band of conventional electromagnetic switches (easily 500M), and a wide band of z or more can be obtained.
第1図は従来の交換用スイッチの構成図、第2図は本発
明の実施例による光スィッチの構成例、第3図と第4図
は本発明を説明するための光間閉スイッチの構成例であ
る。
11〜1.・・・入力端子、
2I〜23・・・電気/光変換素子、
3、〜33・・・1×3光分岐回路、
411〜43.・・・光検出器、
53、・・・光検出器駆動回路、6.〜63・・・増幅
器、7、〜73・・・出力端子、8・・・3×3光開閉
スイツチ、81、〜833・・・光間閉スイッチ素子、
9、〜93・・・3×1光合流回路、
■01〜103・・・光検出器、11・・・電気光学結
晶板、12・・・偏光子、 13・・・検光子
、1411〜■3.・・・透明電極、15・・・透明電
極、16・・・ガラス板、 17・・・透明電極、
18・・・ガラス板、 1911〜1p33・・・透
明電極、20・・・液晶、 21・・・偏光子、 22
・・・検光子。
特許出願人 日本電信電話公社
特許出願代理人 弁理士 山 本 恵 −表3 図
(at (1))((〕
氷4図FIG. 1 is a configuration diagram of a conventional replacement switch, FIG. 2 is a configuration example of an optical switch according to an embodiment of the present invention, and FIGS. 3 and 4 are configurations of an optical inter-closing switch for explaining the present invention. This is an example. 11-1. ... Input terminal, 2I-23... Electrical/optical conversion element, 3, -33... 1x3 optical branch circuit, 411-43. ... photodetector, 53, ... photodetector drive circuit, 6. ~63... Amplifier, 7, ~73... Output terminal, 8... 3x3 optical open/close switch, 81, ~833... Optical close switch element,
9, ~93...3x1 light combining circuit, ■01~103... Photodetector, 11... Electro-optic crystal plate, 12... Polarizer, 13... Analyzer, 1411... ■3. ...Transparent electrode, 15...Transparent electrode, 16...Glass plate, 17...Transparent electrode,
18...Glass plate, 1911-1p33...Transparent electrode, 20...Liquid crystal, 21...Polarizer, 22
...Analyzer. Patent Applicant Nippon Telegraph and Telephone Public Corporation Patent Application Agent Patent Attorney Megumi Yamamoto -Table 3 Figure (at (1)) (() Ice 4 Figure
Claims (1)
の電気/光変換素子と、その各々の出力に接続されるN
個の1xM光分岐回路と、列方向にM個(Mは自然数)
で行方向にN個の光開閉スイッチ素子を有するMxN光
開開開閉スィッチマトリクス有し、N個の各光分岐回路
がN列の光開閉スイッチ累子に対応して、各光分岐回路
毎にM個の光出射端がPv1行の光開閉スイッチ素子の
各々に入力され、さらに、M行の光開閉スイッチ素子の
各行に対応してもうけられN列の各党開閉スイッチ素子
の出力に接続されるM個のNXI光合流回路と、各光合
流目路の出力に接続され、M個の出力端子に結合するM
個の電気/光変換素子とが具備され、光開閉スイノチマ
) IJクスの各構成素子の選択的駆動により各入力端
子を所望の出力端イに接続することを特徴とする交換用
スイッチ。N electrical/optical conversion elements connected to each of N input terminals (N is a natural number), and N electrical/optical conversion elements connected to each output.
1xM optical branch circuits and M in the column direction (M is a natural number)
has an MxN optical opening/closing switch matrix having N optical opening/closing switch elements in the row direction, and each of the N optical branch circuits corresponds to the N columns of optical opening/closing switch elements. M light emitting ends are inputted to each of the Pv1 row of optical switch elements, and are further provided corresponding to each row of the M row of optical switch elements and connected to the output of each party switch element of N columns. M NXI optical merging circuits and M circuits connected to the outputs of each optical merging route and coupled to M output terminals.
What is claimed is: 1. A replacement switch characterized in that the switch is equipped with several electrical/optical conversion elements, and connects each input terminal to a desired output terminal by selectively driving each component of the IJ.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19627981A JPS5897994A (en) | 1981-12-08 | 1981-12-08 | Switch for exchange |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19627981A JPS5897994A (en) | 1981-12-08 | 1981-12-08 | Switch for exchange |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5897994A true JPS5897994A (en) | 1983-06-10 |
JPH0328119B2 JPH0328119B2 (en) | 1991-04-18 |
Family
ID=16355155
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP19627981A Granted JPS5897994A (en) | 1981-12-08 | 1981-12-08 | Switch for exchange |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5897994A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0161683A2 (en) * | 1984-05-17 | 1985-11-21 | Nec Corporation | Optical switch circuit |
JPS6198090A (en) * | 1984-10-18 | 1986-05-16 | Fujitsu Ltd | Optical switch system |
JPS61113199A (en) * | 1984-11-07 | 1986-05-31 | Nec Corp | Optical shift register circuit |
JPS63500131A (en) * | 1985-06-24 | 1988-01-14 | アメリカン テレフオン アンド テレグラフ カムパニ− | optical mixing device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5465410A (en) * | 1977-11-04 | 1979-05-26 | Kokusai Denshin Denwa Co Ltd | Exchange using magnetic domain |
JPS56131287A (en) * | 1980-03-18 | 1981-10-14 | Nippon Telegr & Teleph Corp <Ntt> | Optical cross-bar switch |
-
1981
- 1981-12-08 JP JP19627981A patent/JPS5897994A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5465410A (en) * | 1977-11-04 | 1979-05-26 | Kokusai Denshin Denwa Co Ltd | Exchange using magnetic domain |
JPS56131287A (en) * | 1980-03-18 | 1981-10-14 | Nippon Telegr & Teleph Corp <Ntt> | Optical cross-bar switch |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0161683A2 (en) * | 1984-05-17 | 1985-11-21 | Nec Corporation | Optical switch circuit |
JPS6198090A (en) * | 1984-10-18 | 1986-05-16 | Fujitsu Ltd | Optical switch system |
JPS61113199A (en) * | 1984-11-07 | 1986-05-31 | Nec Corp | Optical shift register circuit |
JPS63500131A (en) * | 1985-06-24 | 1988-01-14 | アメリカン テレフオン アンド テレグラフ カムパニ− | optical mixing device |
Also Published As
Publication number | Publication date |
---|---|
JPH0328119B2 (en) | 1991-04-18 |
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