JPS58100562A - Optical exchange circuit - Google Patents

Abstract

PURPOSE:To attain exchange connection without converting an optical signal, by assigning the optical signals having different wavelength to each terminal. CONSTITUTION:Optical signals in transmission wavelengths lambda1, lambda2 specific to terminals 106, 107 are assigned. A transmission signal from a terminal 108 of the terminal station 106 is converted into the optical signal in lambda1 of wavelength and inputted to an optical multiplex circuit 104 of an optical exchange via an optical branching filter 110, an optical transmission line 100, and an optical branching filter 101. This optical signal is introduced to an optical branching filter 103 via a wavelength selection circuit 105 controlled with a control circuit (not shown) and outputted to an output terminal 116 of the terminal 107 via an optical transmission line 102 and an optical branching filter 115. A transmission signal from the terminal 107 is connected to the terminal 106 similarly. When the number of terminals is increased, the specific transmission wavelength corresponding to the terminal is assigned, and further, the incoming side of an exchange is provided with an optical switch circuit and an optical wavelength converting circuit, and the transmission wavelength assigned to each terminal is made the same.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical switching circuit for mutually folding 411r between subscriber terminals of *a hIII human end user terminals using optical No. 46.

In recent years, as office work has become more complex, so-called multi-function terminals have been developed which not only provide conventional telephone services but also have the ability to transmit and receive high-speed data, etc.

In such multi-functional terminals, the band of signals to be transmitted and received ranges from several MHz to several tens of MHz, so low-mounted optical fiber cables are used instead of conventional coaxial cables as transmission lines that connect these multi-functional terminals. is being considered for introduction.

In order to organically combine these multi-function terminals and provide advanced and wide-ranging services, we need an optical system that can exchange broadband signals sent and received between each multi-function terminal as is. A switching circuit is essential.

An object of the C4 invention is to provide an optical switching circuit capable of exchanging broadband signals transmitted and received at each subscriber layer endpoint in the form of light.

According to the present invention, a plurality of optical branching circuits each having an input/output terminal connected to a plurality of optical fiber cables,
II. A nine-way multiplex circuit, each having a plurality of input terminals connected to the output terminals of the optical demultiplexing circuit, and an input terminal connected to the output terminal of the optical multiplex circuit. Multiple output terminals are connected to each terminal, and 7Jl is connected to the input terminal.
An optical exchange circuit is obtained, which is characterized in that a unique transmission wavelength is assigned to each subscriber #noodle in an optical desert circuit consisting of an 11-member selection circuit that can be used with nine optical signals.

Furthermore, according to Misfire #1, there is a multiple A optical branch IIL circuit which is followed by a plurality of JIt7 eyeper cables, and a plurality of optical branching circuits connected to the output terminals of the plurality of optical branching circuits. The input terminals are connected to each of the plurality of output terminals of the slave circuit and the light distribution switch circuit to select the desired input terminal and output terminal thresholds, respectively, and output mutually synergistic outputs. A plurality of 0 input terminals are connected to the multiple A wave L & variable Takako having IIL and the plurality of IIL Nagabishi Sada element O output terminals, respectively, and the output of the Kuko multi-II circuit and the Iki optical multiplex link. An input terminal is installed at the terminal, and a plurality of output terminals are installed at the input terminal of the Lo optical demultiplexing circuit, so that any number of optical signals applied to the input terminal can be selectively output to the desired output terminal. An optical switching circuit characterized by having an IR circuit with different wavelengths and an IR circuit with different wavelengths is popular.

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of a link 1 of the present invention.

[According to Figure 1, 41 embodiments of the present invention have an input/output terminal at one end of 100 optical fiber cables 100.
[1 optical component 111 circuit 101, a second sufficient wave circuit 108 whose input/output terminal is connected to one end of the sz optical fiber cable 102, 1 circuit 1
The first input terminal is connected to the output terminal of 01, and the second input terminal is connected to the output terminal of the optical demultiplexing circuit 103 of theory 2. Connect the input terminal to il&! 410 light minutes tlL1gl path 1010 input terminal to first output terminal.

A liquid 1jkjl selection circuit 1G capable of selectively outputting a required wavelength in the nine optical signals to an arbitrary output terminal, which is connected to the output terminal of the input terminal Km2 of the second optical path 1010 and applied to the input terminal. Contains easy and t.

111th! ilK# 1st Original Fiber Cagle 1
In the 000 and other calls, the 10th subscriber terminal 10 is tied to one end of the 1gg fiber optic cable 101, and the 10th subscriber terminal 106 is
Terminal 1 (HaK input terminal) is connected to the 10mth Q-element variable element 109 which outputs an optical signal of wavelength λ1, and this @10
Connect the input terminal to the output terminal of the electrical-optical conversion element 1090, #1
younger brother 1 -jt, 7 eyeper cable 1000 and others 11i1
The optical fiber of Marugame 1 is connected to a branching circuit 110, an input terminal is connected to the output terminal of the third optical branching circuit 11G, and an output terminal is connected to the terminal 111 of the third optical branching circuit 11G. including at least a W air mass supplement 112,
The second joining # terminal 107 has an input terminal on terminal 113.
and the electric-to-optical conversion element 114 of the light 2 which outputs an optical signal of length λ snow O.

ζOO20 electro-optical conversion element 1140 output terminal to input terminal 20 yuan fiber cable hose other end input and output knob respectively 1II411I large 1m 40 light minutes IILWA path 115, CCt 4th 4th public power terminal The input terminal is connected to the terminal 116, and the output terminal is connected to the terminal 116.
2 photo-electronic fi conversion volume 117 and 7 (including both).

In GI-, only two subscriber terminals are shown as representatives; in other words, a plurality of subscriber terminals are integrated into each of the plurality of input fibers of the source 1-path 104, and each subscriber terminal has an electro-optical conversion element. are assigned different output wavelengths.

1st! i! 11, the electrical signal applied to the terminal 108 of the first subscriber terminal 106 is converted into an optical signal having a wavelength λ by the electro-optical conversion element 109 of the stripe 1, and is sent to the 30th element demultiplexing circuit 11G. The light of 7 eye per cable 100K is sent out fL, 6. 5K to 91 subscriber terminals 106 K to Shima 1 o Hikari 7 Eyeper Cable 1
The optical signal transmitted at 0K and having nine wavelengths λ passes through the first optical component 11 circuit 101 and is applied to the first input terminal of the optical fiber circuit 104. The light IL circuit 104 is 5K like this.
The liquid volume O from each waste collector applied to multiple input terminals is
It wavelength-multiplexes and outputs different optical signals, and for example, a multiplexing device using a microlens and an interference film can be used.

A wavelength selection circuit 105 selects and outputs a desired wavelength of the 9 #IL member multiplex value obtained at the output terminal of the IIL/multiplex path 104 to an arbitrary output terminal under the control of a control circuit (not shown). Ru. Here this tLik selection ILIl path 1
05 is Marutoba Hatake 421 Application Sakusan Academic Lecture Purchase Preliminary 91" - M-911's 1. I Nb0sj
ldll ljl optical liquid ↓ By providing a plurality of Haimachi-type filters in the waveguide, this can be improved.

In the fan 1d, a control circuit (not shown) selects and outputs 0 element 111 from the subscriber terminal 1O6 of stripe 1, which transmits the wavelength λ to the second output terminal of the control circuit 1435. This light 111 is further connected to the input terminal of the second jt, liquid separation 1g circuit 1030.

ccco'pc min 11-ro IL11,1G3,110
#! An optical signal having 10 wavelengths incident on the input terminal is outputted to the output terminal, and an optical signal that emits 914'togH is outputted to the input/output terminal. Yo-electronic 4 (1g Gakkai Shima 61st Building pHle)
Ki Ia's microphone - Depends on the lens and interference film ^ Both board lengths 14
Layer 1m*Bunno device Sekurabin can be used.

Therefore, #sx, *5 is added to the input terminal of the optical branching path 103, and the number of subscribers 106 with a nine wave value λ1 is
The optical signal from is input/output terminal KI! The optical fibers are output to a unified second optical fiber cable 102.

This optical signal having the wavelength λl is further applied to the input terminal of the second optical-to-electrical conversion element 117 through the subscriber terminal 1070 of the second line 1070 and the fourth optical division m circuit 115, and is then applied to the input terminal of the second optical-to-electrical conversion element 117. After being converted into an electrical signal by element 117, it is output to terminal 116.

On the other hand, similarly, the terminal 113 of the second subscriber terminal 107
The nine dragon energy signals added to the second electrical-to-optical conversion element 114
jt(Ii) having the wavelength λ by the fourth optical demultiplexing circuit 115-second optical fiber cable 102-g2o light beam m11mM103-optical multiplexing circuit 1
04 can be seen at the wavelength selection circuit 1050 input terminal.

The wavelength selection circuit 1 is controlled by a control circuit not shown here.
If the optical signal from the subscriber terminal 107 of the grave 2 having the wave plate λ snow is selectively outputted to the first output terminal of the 05, this optical signal is further transmitted to the light of the 10th element separation circuit 101-g1. The fiber cable 10G-corner 30 passes through the optical demultiplexing circuit 110 and the first optical-to-electrical conversion element 1120 is seen. Furthermore, this first optical-to-electrical conversion element 112 converts the optical signal from the second subscriber terminal 107 that generates this wavelength λ into an electrical signal and outputs it to the terminal 111.

A communication path for propagating wide-band optical signals is set up between the first subscriber terminal 106 and the second subscriber terminal 107, and mutual communication is possible. The call becomes local.

However, in the tenth embodiment of the present invention, which has been happily and unfortunately shown, it is necessary to have as many wavelengths as there are subscriber terminals.
It is necessary to allocate a new wavelength each time the number of wavelengths increases.

The tIs2 diagram is a diagram showing the second embodiment of the book 4111.

As shown in FIG. 2, the second embodiment of the present invention is shown in FIG.
1o optical branch IIL-path 201, a 20th optical branching circuit 203 in which the input/output terminal' is folded at one end of the optical fiber cable 202 of the iris 2, and the first optical branching 1g circuit 2011.
Connect the input terminal of 1 to the output terminal of 1, and connect the 11
An optical switch circuit 2 which has second input terminals respectively connected to the output terminals of the 11gl path 203 and selectively connects desired input terminals and output terminals by a control circuit (not shown).
04, and a first optical switch whose input terminal is connected to the first output terminal of this optical switch circuit 1@204 and outputs an optical signal of wavelength λi.
a wavelength conversion element 205, a second wavelength conversion element 206 whose input terminal is connected to the second output terminal of the optical switch circuit 205 and outputs an optical signal of wavelength λ, and the first wavelength conversion element. An optical multiplexing circuit 207 has a first input terminal connected to the output terminal of the optical multiplexing circuit 205 and a second input terminal connected to the output terminal of the second wavelength conversion element 206, and an input terminal to the output terminal of the optical multiplexing circuit 207. terminal, the first output terminal to the input terminal of the branching circuit 2010 of ts1, -, @2
The second output terminal is connected to the input terminal of the demultiplexing circuit 2030, respectively *a, and a desired wavelength in the original signal applied to the input terminal is selected and outputted to an arbitrary output terminal under the control of a control circuit (not shown). Includes selection path 20B.

In FIG. 2, at the other end of the fourth original fiber cable 200 there is a first (02111 subscriber terminal 209 power) 6, and at the other end of the eyeglass 202 there is a second optical subscriber terminal 210. first subscriber terminal 209 connected to each
connects the Jl electric-optical conversion element 212 whose input terminal is connected to the terminal 211, the input terminal to the output terminal of this first electric-optical conversion element 212, and the other end of the Ml optical 7 eyebar cable 200. The third terminal is connected to the input and output terminals respectively.
a first optical-to-electrical conversion element 215 whose input terminal is connected to the output terminal of the third sufficient wave path 213, and whose output terminal is connected to the terminal 214, The subscriber terminal 210d of Yuki 2 has an input terminal connected to the terminal 216, and the electrical-to-optical conversion element 217 of Kusou 2,
The input terminal is connected to the output terminal of the 20th electro-optical conversion element 217, and the input and output terminals are connected to the other end of the 1120 optical fiber cape #202, respectively.
18, and a circular knit 20 optical-to-electrical converter 22G whose input terminal is connected to the output terminal of the optical demultiplexing circuit 21g and whose output terminal is connected to the terminal 21G of the optical branching circuit 21g.

Although FIG. 92 shows two subscriber terminals and two wavelength conversion elements as representatives, in reality, a plurality of subscriber terminals are printed on each of the plurality of input terminals of the optical switch circuit 2G4, and the former switch, Il of the circuit 204 [hence the output terminal,
A plurality of wavelength conversion elements are respectively inserted between the plurality of input terminals of the optical multiplexing circuit 207, and different output wavelengths are assigned to each wavelength conversion element.

The second embodiment of the invention shown in FIG. 92 is the same as the first embodiment of the invention shown in FIG. λ, is used.

In Figure 7131, the first (07111 people 4i final 209
The electrical signal applied to the terminal 211 of 41 is converted to an IIL length λ by 41 electrical-to-optical conversion elements 212. The signal is converted into an optical signal having a 11-bit wavelength signal, and is sent out to the first optical fiber cable 20GtC via the optical fiber 11 circuit 213 of the optical fiber cable 3. In this way, to the subscriber terminal 209 of #gl: Therefore, the original signal that powers the wavelength λ, which is transmitted from the optical 7 eye bar cable 20 OK of i41, passes through the optical component IIL circuit 201 of the rattan l to the optical switch circuit 204. 1 input terminal. By controlling the light switch and the child circuit 204rj1, a control circuit (not shown),
In this way, the optical signal having the wavelength λ from each subscriber terminal applied to the input terminal is selectively grafted onto a desired output terminal. LINbO of war
, directional coupling type optical switches can be used.

Optical switch circuit 204 t) A plurality of IILJlE conversion elements that output different output wavelengths are connected to the plurality of output terminals, respectively. If necessary, the wavelength λ of the optical signal from each subscriber terminal is converted to another wavelength.

Here, the number of wavelength conversion elements may be determined according to the amount of traffic and can be made smaller than the number of four subscribers. Before this wavelength conversion element, there is a
iiiil J@urnal of Ql yet Q
B-14,411, N@V 19751 pJilo
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ical l) @t@cteys and Lmght-娨mltti 鳵M川・dO'' can be used.

Suppose that the 10th input terminal of the switching circuit 204 is selectively connected to the input terminal of the GTO wavelength conversion element 2050 by a control circuit not shown in Fig. 2.
) The wavelength λ of the optical signal from the human trend 209 is converted into a wavelength λIK by the first oIIL length conversion element 205 and applied to the first input terminal of the optical multiplexing circuit 207 . The optical multiplexing circuit 207 wavelength-multiplexes the original signals of different wavelengths from each wavelength conversion element that are applied to the plurality of input terminals in this manner and outputs the resultant signal. Furthermore, the wavelength selection circuit 208 is controlled by a control circuit (not shown) to control the wavelength multiplexing circuit 207.
A desired wavelength of the nine-wavelength multiplexed optical signal obtained at the output terminal of is selectively outputted as an arbitrary output. An optical signal having a liquid length λ is selectively outputted to the 20th output terminal of the wavelength selection 1gi path 208 by a control circuit not shown in FIG. The signal is then sent out to the second optical fiber cable 202. This optical signal having wavelength λ1 is further transmitted to the second subscriber terminal 21G.
A fourth sufficient wave circuit 218 is applied to the input terminal of the second optical-to-electrical conversion element 220, and after being converted into an electrical signal by the optical-to-electrical conversion element 22G, the terminal 21
9 is output.

On the other hand, similarly, a control circuit (not shown) causes the input terminal of the chain 2 of the optical switch path 204 to be set to the second waveform conversion 1.
The input signal 206 is selectively connected to the four input terminals of the wavelength selection circuit 206, and the original signal having the wavelength λt- is selectively outputted to the output terminal of the wavelength selection circuit 208. As a result, the electrical signal applied to the terminal 216 of the terminal 21G of the nest 2 is converted into the original signal by the second electrical-optical conversion circuit 217, and then the original signal of the ILIgl path 211i1-$2 of the transfer 4 is converted into the original signal. Fiber cable 202-second sufficient rotation circuit 203-optical switch circuit 204-selection 20Iil length conversion element 206-light J1 circuit 207-wavelength selection circuit 20fi-, @l optical component tjLIJai path 201-5911 optical 7 eye bar Cagle 2υ〇 - 3rd ninth wave j12131J - then 1st
The first optical-to-electrical conversion circuit 2150 inputs the signal into an electrical signal, which converts it into an electrical signal and outputs it to the terminal 214.

In this way, between the 107J11 subscriber bundle 2011 shown in Figure 42 and the 20th subscriber end 210, a pass IIi path is set up to transmit the original signal with a wide band, and mutual distribution is possible. - and fjru.

The second embodiment of the nine main station #4 shown in FIG. 2 is different from the first embodiment of the present invention shown in FIG.
The same output a length can be used in the pan for the light conversion element, and also K. Since the number of five wavelengths handled within the switching circuit is also reduced, the design of the wavelength selection circuit 208 is also facilitated.

As described above, according to the present invention, it is possible to obtain an optical switching circuit that can exchange wide-area signals sent and received between subscriber terminals as they are.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a first embodiment of the present invention, and FIG. 2 is a diagram showing a second embodiment of the present invention. In the figure, 100, 102, 200 and 202 are optical fiber cables, 101, 103, 110, 115,
201゜203.213 and 21g are sufficient wave circuits, 1
04 and 207 are optical multiplex circuits, 105 and 208 are wavelength selection circuits, 109, 114, 211 and 217 are electro-optical conversion elements, 112, 117, 215 and 22
0 is a photo-electric conversion element, 204 is an optical switch circuit, 20
5 and 206 are 11jL members different! Each represents an I4 element.

Claims (1)

[Scope of Claims] A plurality of optical branching circuits each having an input/output terminal t-connected to the subscriber optical fiber cable of +11 I[a. an optical multiplexing circuit in which a plurality of high power terminals are respectively connected to the output terminals of the plurality of optical demultiplexing circuits, an input terminal is connected to the output terminal of the optical multiplexing circuit, and an input terminal is connected to the input terminal of the plurality of optical demultiplexing circuits, respectively In an optical switching circuit consisting of a wavelength selection circuit connected to a plurality of output terminals and capable of selectively outputting any wavelength of an optical signal applied to an input terminal to a desired output terminal, transmission unique to each subscriber is performed. An optical switching path characterized by assigning wavelengths. (2) A plurality of optical molecule IL own circuits each having an input/output terminal connected to a plurality of subscriber optical fiber coggles, and a plurality of input terminals each connected to the output terminal of the plurality of optical demultiplexing circuits, and a desired input terminal. and an optical switch circuit selectively connecting between the output terminal and the output terminal; a plurality of wavelength converters each connected to the input terminal' of the plurality of output terminals of the optical switch circuit and outputting different output wavelengths; an optical multiplexing circuit, each having a plurality of input terminals connected to the output terminal of the wavelength conversion element; an input terminal connected to the output terminal of the optical multiplexing circuit; and a plurality of input terminals connected to the input terminals of the plurality of optical demultiplexing circuits. The output terminal of is connected, and the wavelength of the optical tw No. 0fEJE applied to the input terminal can be selectively output to the desired output terminal.