JP2818526B2 - Optical ATM switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical ATM switch for performing switching in accordance with a header of an optical cell signal.

[0002]

2. Description of the Related Art Optical communication using optical fibers for transmission lines
It is expected that the optical fiber will be widely used in the future because of its advantages such as being able to transmit a large amount of information due to the wide band of the optical fiber and the fact that the optical fiber does not receive induced noise. As an exchange used in this optical communication, an optical exchange capable of exchanging optical signals in an optical region is desirable. Above all, optical ATM exchanges that handle optical signals converted into cells are promising because they can efficiently exchange information of various signal speeds. As such an optical ATM switch, "Study and Basic Experiment of Optical ATM Switch Using VSTEP" by the same person as the inventor of the present application (Proceedings of IEICE Exchange Study Group S
SE91-82).

FIG. 29 is a diagram showing the configuration of such a conventional optical ATM exchange, and exemplifies the case of two input terminals and output terminals (2 × 2). The optical cell signals A and B respectively input from the optical waveguides 2901 and 2902 are transmitted to the optical buffer memory 2.
903 and 2904. Optical buffer memory 29
Numerals 03 and 2904 denote first-in / first-out (F
The optical cell signal is transmitted to the optical waveguides 2905 and 290 by the
6 to the 2 × 2 optical self-routing circuit 2907. The 2 × 2 optical self-routing circuit 2907 converts the optical cell signal into the optical waveguide 290 according to the header portion of the optical cell signal incident from the optical waveguides 2905 and 2906.
Self-routing to 8,2909.

FIG. 30 is a detailed block diagram of the 2 × 2 optical self-routing circuit 2907 shown in FIG. In FIG. 30, optical waveguides 2905, 2906, 2908, 290
9 respectively correspond to the optical waveguides of FIG.
Optical cell signal A or C, B input to 905, 2906
Alternatively, D is split into two by optical splitters 3003 and 3004, respectively, and is input to optical gates 3005 and 3006 and 3007 and 3008. Output optical signals from the optical gates 3005 and 3007 are combined by the optical combiner 3009 and output from the optical waveguide 2908. Output optical signals from the optical gates 3006 and 3008 are combined by the optical combiner 3010 and output from the optical waveguide 2909. The electric pulse generation circuit 3013 includes the optical gate 300
5,3007 is supplied with the same electric pulse via the resistor 3020, and another optical pulse is supplied to the optical gates 3006, 3008 via the resistor 3021.

FIG. 31 shows optical gates 3005-3 in FIG.
008 is a perspective view for explaining one structure. FIG. FIG.
Of the light guide layer, one end face 31 of the light guide layer 3110
An input optical signal 3100 is input to 20, and an output optical signal 3150 is output from the other end face 3130. Further, a control signal V is applied via an electrode 3140. This optical gate is, when the input optical signal 3100 is incident when V = V _H, amplifies the optical signal incident during being applied a voltage of subsequent _{V = V L (V L <} V H) Output. For details of such an optical gate, refer to
Fall Meeting Proceedings 754 pages Lecture No. 26p-H-
2.

FIG. 32 is a timing chart for explaining the operation of FIG. Reference numeral 3201 denotes the resistor 30
Shows the voltage pulse applied to the 20, between times t ₁ ~t ₃ V
Next to _H0, keep the V _L0 time of t ₃ ~t _8. 3202 indicates a voltage pulse applied to the optical gates 3005,3007, between V _H0 is less than V _H at time t ₁ ~t ₃ by resistor 3020, keeping the V _L0 smaller V _L between t ₃ ~t _8. 32
03 indicates a voltage pulse applied to the resistor 3021 at time t
₃ next V _H0 between ~t _5, kept between V _L0 of t ₅ ~t _8.
3204 indicates a voltage pulse applied to the optical gates 3006, 3008, V between times t ₃ ~t ₅ by resistor 3021
_H0 is less than V _H, keep the t ₅ ~t ₈ less than V _L.
The optical cell signal A input to the optical gates 3005 and 3006 in FIG. 30 is output from time t ₁ to t _{1 as} indicated by 3205 in FIG.
Header optical signal only between ₂ are present, the data unit optical signal at time t ₆ ~t ₇ is present. Therefore, the light gate 300
5, the time of the electric pulse V _H coincides with the time of the presence of the header part optical signal, but the optical gate 3006 does not. Therefore, the data portion of the optical cell signal A is the optical gate 3
005 and is routed to the optical waveguide 3011 via the optical coupler 2908. On the other hand, the optical gate 300
32, the optical cell signal B incident on 7,3008
Only during the time t ₄ ~t ₅ as shown in 206 there is the header part optical signal, while the data section light signal at time t ₆ ~t ₇ is present. Therefore, in the optical gate 3008, the time during which the electric pulse is at V _H coincides with the time during which the header portion optical signal exists, but the optical gate 3007 does not. Therefore, the data portion of the optical cell signal B passes through only the optical gate 3008 and is routed to the optical waveguide 2909 via the optical coupler 3010.

As described above, in the optical self-routing circuit of FIG. 30, the optical waveguide 29 depends on whether the header portion of the optical cell signal is at time t _{1 to} t ₃ or t _{3 to} t _5.
Self-routing to 08 or 2909. The optical cell signal C incident on the optical gates 3005 and 3006
Represents a header portion between times t ₁ and t ₂ as indicated by 3207,
data portion is present in t ₆ ~t _7. Optical gate 3007,
Photocell signal D enters the 3008 header section at time t ₂ ~t ₃ as shown in 3208, the data unit is present in the t ₆ ~t _7. Optical cell signals C, Both D, may conflict with each other in a signal to be output to the optical waveguide 2908, a header part is present within the time the applied voltage of the light gates 3005,3007 is a V _H. However, since the header portion of the optical cell signal C is first incident on the optical gate 3005, the optical gate 3005 is first switched to a state of passing the subsequent data portion. When the optical gate 3005 shifts to this state, the injection current into the optical gate 3005 increases, and the voltage applied to the optical gate 3007 decreases due to the voltage drop due to the current passing through the resistor 3020.
The optical gate 3007 can no longer transmit the data portion following the optical cell signal D. As a result, only the data portion of the optical cell signal C passes through the optical gate 3005 and is self-routed to the optical waveguide 2908 via the optical coupler 3009. In this way 30, not only the header portion of the optical cell signals are self-routed by one to whether the time t ₁ ~t ₃ or t ₃ ~t _5, as early header within the time range appearance The optical signals are emitted from the optical waveguides 2908 and 2909 in this order.

[0008]

SUMMARY OF THE INVENTION The above-mentioned conventional optical AT
In an M switch, for example, an N input terminal and an N output terminal (N ×
In order to configure an optical ATM switch of (N, N is an integer of 2 or more), at least N ² is considered in consideration of avoiding collision of a plurality of optical cell signals at each of the N output terminals.
It is necessary to provide a number of time slots for a header part optical signal for self-routing. Since the number of time slots increases with an increase in the number N of terminals of the optical ATM switch, the ratio of the header portion in the optical cell signal also increases, and there is a problem that the throughput of the effective data portion transfer decreases. Also, in the conventional optical ATM switch, priorities are assigned to optical cell signals in advance, and when priority control of routing optical cell signals to output terminals in an order according to the priorities is performed, self-routing for self-routing is performed. Since a time slot required for the header portion for priority control is added to the number of time slots N ² , there is a problem that it is difficult to perform priority control without lowering the throughput.

Further, in the conventional optical ATM switch, only a so-called one-to-one connection for self-routing an optical signal to one predetermined output terminal in accordance with a header portion of an optical cell signal input from an input terminal is possible. Broadcast control for connecting a single optical signal to a plurality of output terminals cannot be performed.

An object of the present invention is to provide an optical ATM switch capable of reducing the proportion of a header portion for self-routing in an optical cell signal or improving the effective throughput by using a plurality of optical self-routing circuits. Another object of the present invention is to provide an optical ATM switch capable of performing priority control by adding a priority control header portion by reducing the proportion of a self-routing header portion.

It is another object of the present invention to provide an optical ATM switch which enables broadcast connection in accordance with a header portion of an optical cell signal, that is, enables optical broadcast control.

[0012]

Means for Solving the Problems The first invention of the present application is an invention in which
(N is an integer of 2 or more) first input terminals and m (m is 2
An optical ATM switch having (the above integer) first output terminals, n second input terminals connected to the first input terminal, a second output terminal, and the first output terminal. Each of the output terminals has m output terminal groups corresponding to each of the output terminals, and each of the output terminal groups has n third output terminals. Self-routing to the predetermined third output terminal according to information, to which of the third output terminals the optical signal is self-routed, and to which of the third output terminals the optical signal is self-routed. Indicating the detection signal
A self-routing circuit with n inputs and (n × m) outputs to output terminals, a control circuit that outputs a control signal in response to the detection signal from the second output terminal, and n number of third circuits , A fourth input terminal, and n number of fourth output terminals, and n number of third output terminals of each of the output terminal groups are respectively connected to n number of the third input terminals. M n-input, n-output optical space switches that are connected and output the optical signal to the predetermined fourth input terminal in response to the control signal input to the fourth input terminal; (N × m) optical buffer memories connected to each of the n fourth output terminals of each of the optical space switches and for storing and outputting the optical signal, and m optical space switches, respectively. From the n optical buffer memories connected to each of the n output terminals of M pieces of n that combine and output optical signals
And a merging device.

The second invention of the present application is directed to an optical ATM switch having n (n is an integer of 2 or more) first input terminals m (m is an integer of 2 or more) first output terminals. The wavelength of the optical signal incident from each of the first input terminals is fixedly set to each of the n different wavelengths, and the n number of wavelengths connected to the first input terminal are fixed. The optical signal having a second input terminal, a second output terminal, and m third output terminals corresponding to each of the first output terminals, and being input to the second input terminal. Is wavelength-multiplexed to the predetermined third output terminal according to the header information and self-routed, and a detection signal indicating to which third output terminal the wavelength-division multiplexed optical signal is self-routed is output to the second output terminal.
An n-input, m-output optical self-routing circuit that outputs to an output terminal of the optical self-routing circuit; a control circuit that outputs a control signal in response to the detection signal from the second output terminal; M n splitters respectively connected to the third output terminal for splitting the wavelength multiplexed optical signal, and n corresponding to each of the m third output terminals of the optical self-routing circuit And a third input terminal, a fourth input terminal, and a fourth output terminal,
Each of the m n-branches is connected to the third input terminal, respectively, and an optical signal of a predetermined wavelength is converted from the wavelength multiplexed optical signal in response to the control signal input to the fourth input terminal. And outputs it to the fourth output terminal (n ×
m) variable wavelength selecting elements and n corresponding to each of the m third output terminals of the optical self-routing circuit.
(Nxm) variable wavelength selection elements, each of which is connected to each of the fourth output terminals to store and output the optical signal of the predetermined wavelength. An optical buffer memory; and m n optical circuits that merge and output the optical signals from the n optical buffer memories provided corresponding to each of the m third output terminals of the optical self-routing circuit. And a merging device.

According to a third aspect of the present invention, there is provided an optical ATM switch having n (n is an integer of 2 or more) first input terminals and m (m is an integer of 2 or more) first output terminals. G wavelength groups composed of n optical signals having mutually different wavelengths and having different wavelength bands to which the n optical signals belong, and g wavelengths from each of the n first input terminals. G optical signals having wavelengths different from each other, which are assigned one wavelength in advance from each group, are input one by one,
A second output terminal connected to the first output terminal, a second output terminal, and m third output terminals corresponding to each of the first output terminals; Wavelength multiplexing the optical signal input to the second input terminal to the predetermined third output terminal in accordance with the header information and the wavelength of the optical signal for each of the g wavelength groups and performing self-routing; An n-input, m-output optical self-routing circuit for outputting a detection signal indicating to which third output terminal the multiplexed optical signal is self-routed to the second output terminal; A control circuit that outputs a control signal in accordance with the detection signal; and m n-branch units that are respectively connected to the m third output terminals of the optical self-routing circuit and branch the wavelength-multiplexed optical signal. The optical self-routing N pieces of n output terminals are provided corresponding to each of the m pieces of third output terminals of the path, and have a third input terminal, a fourth input terminal, and a fourth output terminal. Each of the optical devices is connected to the third input terminal, and selects an optical signal of a predetermined wavelength from the wavelength multiplexed optical signal in response to the control signal input to the fourth input terminal, and selects the fourth optical signal. (N × m) tunable wavelength selection elements that output to the output terminals of the optical self-routing circuit, and n tunable wavelength selection elements corresponding to each of the m third output terminals of the optical self-routing circuit,
(N × m) optical buffer memories connected to each of the fourth output terminals of each of the (n × m) variable wavelength selection elements for storing and outputting the optical signal of the predetermined wavelength; ,
And m n multiplexers for merging and outputting the optical signals from the n optical buffer memories provided corresponding to each of the m third output terminals of the optical self-routing circuit. ing.

According to a fourth aspect of the present invention, there is provided an optical ATM switch having n (n is an integer of 2 or more) first input terminals and m (m is an integer of 2 or more) first output terminals. A second input terminal connected to the first input terminal; k
(K is an integer of 2 or more) second output terminals, and output n optical signals input to the second input terminal to the k second output terminals in order. A distribution circuit and n
N third input terminals to which one of each of the k second output terminals of each of the distribution circuits is connected, a third output terminal, and the first output terminal Has m output terminal groups corresponding to each of the above, each of the output terminal groups has n fourth output terminals, and an optical signal input to the third input terminal is used as header information. According to the predetermined fourth
K output to the third output terminal a self-routing to the third output terminal, and a detection signal indicating which fourth output terminal the optical signal is self-routed to is output to the third output terminal.
An input, (n × m) output optical self-routing circuit;
It has k fourth input terminals and a fifth output terminal, and one of the n fourth output terminals of each of the k optical self-routing circuits is one of the k fourth output terminals. (N × m) combining circuits connected to a fourth input terminal and sequentially outputting the optical signals input to the k fourth input terminals to the fifth output terminal; A control circuit that outputs a control signal in accordance with the detection signal from the output terminal of No. 3,
A sixth input circuit to which n fifth output terminals of the synthesis circuits to which n fourth output terminals of each of the output terminal groups are connected; Input terminal and
m n inputs having n sixth output terminals and outputting the optical signal to a predetermined sixth output terminal in accordance with the control signal input to the sixth input terminal; An output optical space switch, and (n × m) optical buffer memories connected to each of the n sixth output terminals of each of the m optical space switches for storing and outputting the optical signal; , And m n optical couplers connected to each of the n sixth output terminals of each of the m optical spatial switches, for combining and outputting the optical signals from the n optical buffer memories. ing.

According to a fifth aspect of the present invention, there is provided an optical ATM switch having n (n is an integer of 2 or more) first input terminals and m (m is an integer of 2 or more) first output terminals. n
The wavelengths of the optical signals incident from each of the first input terminals are fixedly set to n different wavelengths from each other, and the second input terminal connected to the first input terminal And k (k is an integer of 2 or more) second output terminals, and the optical signal input to the second input terminal is k
N output circuits, which are sequentially output to the second output terminals, and n number of output circuits connected to each of the k second output terminals of each of the n output circuits. 3, an input terminal, a third output terminal, and m number of fourth output terminals corresponding to each of the first output terminals. Wavelength multiplexing to the predetermined fourth output terminal according to the information and self-routing, and outputting to the third output terminal a detection signal indicating which of the fourth output terminals the wavelength multiplexed optical signal is self-routed to. K n-input, m-output optical self-routing circuits, k fourth input terminals, and fifth output terminals, and each of the k optical self-routing circuits has m One of the fourth output terminals is one of the k fourth input terminals. Are connected to the k fourth input terminals, respectively, and the m combining circuits sequentially output the wavelength multiplexed optical signals connected to the k fourth input terminals to the fifth output terminal. And m splitters respectively connected to the fifth output terminals of each of the m synthesis circuits for splitting the wavelength-multiplexed optical signal, and the detection signal from the third output terminal. A control circuit that outputs a control signal in response to the control signal; and n control circuits each corresponding to each of the m fourth output terminals of the optical self-routing circuit, a fifth input terminal and a sixth input terminal. And a sixth output terminal.
N branchers are respectively connected to the fifth input terminal, and select an optical signal of a predetermined wavelength from the wavelength multiplexed optical signal according to the control signal input to the sixth input terminal. (N × m) tunable wavelength selection elements for outputting to the sixth output terminal, and n each corresponding to each of the m fourth output terminals of the optical self-routing circuit, (N × m) optical buffer memories connected to each of the sixth output terminals of each of the (n × m) variable wavelength selection elements and storing and outputting the predetermined wavelength optical signal; And m n-multiplexers for combining and outputting the optical signals from the n optical buffer memories provided corresponding to each of the m fourth output terminals of the self-routing circuit. .

According to a sixth aspect of the present invention, there is provided an optical ATM switch having n (n is an integer of 2 or more) first input terminals and m (m is an integer of 2 or more) first output terminals. G wavelength groups composed of n optical signals having mutually different wavelengths and having different wavelength bands to which the n optical signals belong, and g wavelengths from each of the n first input terminals. G optical signals having wavelengths different from each other, which are assigned one wavelength in advance from each group, are input one by one,
It has n second input terminals connected to the first output terminal and k (k is an integer of 2 or more) second output terminals, and is input to the second input terminal. N distribution circuits for sequentially outputting optical signals to the k second output terminals, and k k second output circuits of each of the n distribution circuits.
Has three input terminals to which one of the output terminals is connected, a third output terminal, and m fourth output terminals corresponding to each of the first output terminals. The wavelength division multiplexing of the optical signal input to the third input terminal to the predetermined fourth output terminal according to header information and the wavelength of the optical signal for each of the g wavelength groups, and self-routing;
K n-input, m-output optical self-routing circuits for outputting to the third output terminal a detection signal indicating to which of the fourth output terminals the wavelength multiplexed optical signal is self-routed; And four input terminals and a fifth output terminal, each of the k optical self-routing circuits having m
One each of the fourth output terminals is connected to the k fourth input terminals, and the wavelength multiplexed optical signals connected to the k fourth input terminals are sequentially transmitted to the fifth input terminal. M output circuits, and m number of n splitters respectively connected to the fifth output terminal of each of the m synthesis circuits and splitting the wavelength multiplexed optical signal, A control circuit for outputting a control signal in accordance with the detection signal from a third output terminal; and n control circuits corresponding to each of the m fourth output terminals of the optical self-routing circuit, 5
, A sixth input terminal, and a sixth output terminal, each of the m n-branch devices is connected to the fifth input terminal, respectively, and is input to the sixth input terminal. The optical signal having a predetermined wavelength is selected from the wavelength multiplexed optical signal in accordance with the control signal, and is output to the sixth output terminal (n
× m) tunable wavelength selection elements, and n nx corresponding to each of the m fourth output terminals of the optical self-routing circuit, and (n × m) tunable wavelength selection elements (N × m) optical buffer memories connected to each of the sixth output terminals for storing and outputting the optical signal of the predetermined wavelength, and m of the fourth optical self-routing circuits. And n m optical couplers for combining and outputting the optical signals from the n optical buffer memories provided in correspondence with the respective output terminals.

According to a seventh aspect of the present invention, there is provided an optical ATM switch having n (n is an integer of 2 or more) first input terminals and m (m is an integer of 2 or more) first output terminals. A second output terminal connected to the first input terminal, a second output terminal, and m output terminal groups corresponding to each of the first output terminals; Each of the terminal groups has n third output terminals, and causes the optical signal input to the second input terminal to be self-routed to a predetermined third output terminal according to the first header information. Outputting to the second output terminal a detection signal indicating to which of the third output terminals the optical signal has been self-routed.
An input (n × m) output optical self-routing circuit, a control circuit for outputting a control signal in response to the detection signal from the second output terminal, n third input terminals,
, And n number of fourth output terminals, and n number of third output terminals of each of the output terminal groups are connected to n number of the third input terminals, respectively. A first of m n-input and n-output first outputs the optical signal to the predetermined fourth output terminal in response to the control signal input to the input terminal.
An optical space switch, a fifth input terminal connected to the first n fourth output terminals, and p (p is equal to or greater than 2) equal to a priority sequence number previously assigned to the optical signal. An integer) number of fifth output terminals, and converts the optical signal input to the fifth input terminal into a predetermined fifth signal in accordance with second header information.
Connected to (n × m) second optical space switches to be self-routed to the output terminals of the second optical space switch and to p p fifth output terminals of each of the (n × m) second optical space switches. (N × m) optical buffer memory groups including p optical buffer memories for storing and outputting the optical signals corresponding to the priorities, and n fourth optical memory switches of the first optical space switch. The optical signals of the same priority from the optical buffer memory group corresponding to each of the n second optical space switches to which the fifth input terminal is connected corresponding to the output terminal of (P × m) first n-multiplexers to be output, and p header signals from the first n-multiplexers corresponding to the first optical space switch according to third header information M p-input, 1-output third lights that output one signal preferentially And a while the switch.

The eighth invention of the present application is directed to an optical ATM switch having n (n is an integer of 2 or more) first input terminals m (m is an integer of 2 or more) first output terminals. The wavelength of the optical signal incident from each of the first input terminals is fixedly set to each of the n different wavelengths, and the n first wavelengths are connected to the first input terminal. A second input terminal, a second output terminal, and m third output terminals corresponding to each of the first output terminals.
The wavelength division multiplexed optical signal is self-routed to any of the third output terminals according to the first header information, and the self-routing is performed. An n-input, m-output optical self-routing circuit that outputs a detection signal indicating whether the detection has been performed to the second output terminal; and a control circuit that outputs a control signal in response to the detection signal from the second output terminal. , M n-branch units respectively connected to the m third output terminals and branching the wavelength-multiplexed optical signal, and n-branch units corresponding to each of the m third output terminals are provided. And a third input terminal, a fourth input terminal, and a fourth output terminal, each of the outputs of the m n-branch devices being connected to the third input terminal, respectively, 4 according to the control signal input to the input terminal Select an optical signal having a predetermined wavelength from said wavelength multiplexed optical signal to output to said fourth output terminal (n
× m) variable wavelength selection elements, a fifth input terminal connected to the fourth output terminal, and p (p is an integer of 2 or more) equal to the number of priorities assigned to the optical signal in advance. ) Fifth output terminals, and the optical signal input to the fifth input terminal is self-routed to a predetermined fifth output terminal according to second header information (n × m ) First spatial switches and p n fifth output terminals of each of the (n × m) optical spatial switches;
P for storing and outputting the optical signal corresponding to the priority order
(N × m) optical buffer memory groups each including n optical buffer memories and n corresponding to each of the third output terminals.
The fourth of each of the plurality of variable wavelength selection elements provided
The optical signals having the same priority from the optical buffer memory group corresponding to each of the n optical space switches having the fifth input terminal connected to the output terminal are merged and output (p × m). M optical couplers, and outputs one optical signal preferentially from p optical signals from the n optical couplers corresponding to the third output terminals according to third header information.
And two p-input and 1-output second optical space switches.

According to a ninth aspect of the present invention, there is provided an optical ATM switch having n (n is an integer of 2 or more) first input terminals and m (m is an integer of 2 or more) first output terminals. G wavelength groups composed of n optical signals having mutually different wavelengths and having different wavelength bands to which the n optical signals belong, and g wavelengths from each of the n first input terminals. G optical signals having wavelengths different from each other, which are assigned one wavelength in advance from each group, are input one by one,
A second output terminal connected to the first output terminal, a second output terminal, and m third output terminals corresponding to each of the first output terminals; The optical signal input to the second input terminal is transmitted to a predetermined third output terminal according to first header information and a wavelength of the optical signal.
N-input and m-output which output to the second output terminal a detection signal indicating which of the third output terminals the wavelength-division multiplexed optical signal is self-routed to and wavelength-multiplexed and self-routed for each wavelength group. An optical self-routing circuit, a control circuit that outputs a control signal in response to the detection signal from the second output terminal, and m connected to the m third output terminals of the optical self-routing circuit, M n-branch devices for branching the wavelength multiplexed optical signal;
The optical self-routing circuit has n input terminals corresponding to each of the m third output terminals, and has a third input terminal, a fourth input terminal, and a fourth output terminal, m
N branchers are respectively connected to the third input terminal, and select an optical signal of a predetermined wavelength from the wavelength multiplexed optical signal according to the control signal input to the fourth input terminal. (N × m) tunable wavelength selection elements for outputting to the fourth output terminal, a fifth input terminal connected to the fourth output terminal, and a priority assigned to the optical signal in advance And p (p is an integer of 2 or more) equal to the number of the fifth output terminals, and the optical signal input to the fifth input terminal is converted into the predetermined first signal in accordance with second header information. (N × m) first optical space switches to be self-routed to 5 output terminals, and connected to the p fifth output terminals of each of the (n × m) optical space switches; It is composed of p optical buffer memories for storing and outputting the optical signals corresponding to the priorities. The (n × m) optical buffer memory groups and the fifth input to the fourth output terminal of each of the tunable wavelength selection elements provided n by n corresponding to each of the third output terminals The optical signals having the same priority from the optical buffer memory group corresponding to each of the n optical space switches connected to the terminals are merged and output (p
× m) n optical multiplexers, and one optical signal is preferentially output from the p optical signals from the n optical multiplexers corresponding to the third output terminals in accordance with third header information. , M p-input, 1-output second optical space switches.

According to a tenth aspect of the present invention, there is provided an optical self-routing circuit having n (n is an integer of 2 or more) input terminals and m (m is an integer of 2 or more) output terminals. The optical self-routing circuit is constituted by an optical gate that transmits the data portion of the optical cell signal only when the header signal and the electric signal of the optical cell signal are simultaneously applied,
The data section is self-routed to the predetermined output terminal according to the header signal placed in m time slots provided corresponding to each of the m output terminals, and The optical header signal is placed in a plurality of time slots of the m number corresponding to a plurality of predetermined output terminals.

According to an eleventh aspect of the present invention, an optical cell signal is generated from a data portion connected to n (n is an integer of 2 or more) first input terminals and a broadcast control signal. The n optical buffer memories, which are emitted after being stored and stored, and each of the n optical buffer memories is connected to each of the n second input terminals, and the header signal and the electric signal of the optical cell signal are transmitted. Only when applied at the same time, after that, an optical signal composed of an optical gate that transmits the data portion of the optical cell signal and having the same number as the number of the first header signals included in the optical cell signal is generated, and m (m is A light having n first input terminals and m first output terminals, the first optical self-routing circuit configured to self-route to (first integer of 2 or more) first output terminals. A copy circuit, and m M header insertion circuits that are connected one by one to each of the output terminals and add a second header signal for performing self-routing to the incident optical signal, m third input terminals, and m Second output terminals, and each of the m header insertion circuits includes the m third output terminals.
The optical signal is connected to each of the m input terminals, and the optical signal is predetermined according to the second header signal placed in m time slots provided corresponding to each of the m second output terminals. An optical self-routing circuit that performs self-routing to the second output terminal of the optical cell signal, wherein the optical copy circuit generates the same number of data sections as the number of the first header signals included in the optical cell signal, Each of the header insertion circuits adds the second header signal to each of the data portions generated by the optical copy circuit, and the optical self-routing circuit pre-determines the data portion in accordance with the second header signal. And self-routing to the second output terminal.

[0023]

In the optical ATM switch according to the present invention, the optical buffer memory is arranged immediately before the output terminal. The plurality of optical cell signals are once written in the buffer memory, and then sequentially output. Therefore, only the time slot corresponding to each output terminal needs to be set in the header section of the optical cell signal. For example, when an N × N optical ATM switch is configured, the number of time slots required for the header section is N And the conventional optical AT
M than switch to the time slot number N ² which requires at least the header part in can be reduced to 1 / N, it is possible to reduce the physician proportion of the header portion of the optical cell signals, improves effective throughput.

In the optical ATM switch according to the present invention, the optical self-routing circuit self-routes to each output terminal according to the combination of the time slot and the wavelength group of the optical signal. N / g (g is the number of wavelength groups) can be reduced, and the effective throughput is further improved.

In the optical ATM switch according to the present invention, a plurality of optical self-routing circuits are used, and one optical self-routing circuit transfers another optical self-routing circuit while the data part optical signal of the optical cell signal is being transferred. Performs the processing of the header portion of the next optical cell signal, so that the effective throughput is improved.

Furthermore, the optical ATM switch according to the present invention can reduce the number of time slots in the header required for self-routing, so that priority control can be performed by adding a header for priority control.

In the broadcast control method for an optical ATM switch according to the present invention, an optical self-routing circuit that performs self-routing by placing a header portion of an optical cell signal in a time slot corresponding to an output terminal is used. Since the copy unit and the self-routing operation of the optical signal are performed simultaneously by arranging the units in time slots corresponding to a plurality of predetermined output terminals, it is possible to perform the broadcast control of the optical signal.

Further, in the broadcast control method of the optical ATM switch of the present invention, the optical copy circuit copies optical signals of the same number as the number of headers of the optical cell signals, and thereafter copies each of the copied optical signals. Is self-routed to the predetermined output terminal by the optical self-routing circuit on a one-to-one basis, so that the broadcast optical cell signal can be sent to the optical self-routing circuit even when the connections to the predetermined plural output terminals are not simultaneously available.

[0029]

FIG. 1 is a block diagram showing an embodiment of the first invention of the present invention, showing a case of two input terminals and two output terminals (2 × 2). Optical cell signal A, B or optical cell signal C. D enters the 2 × 4 optical self-routing circuit 103 from the optical waveguides 101 and 102, respectively. The optical signal output from the optical self-routing circuit 103 is transmitted to the 2 × 2 optical space switch 108 via the optical waveguides 104 and 105 or the optical waveguide 10.
6 and 107 to the 2 × 2 optical space switch 109. Output optical signals of the 2 × 2 optical space switch 108 sent to the optical waveguides 110 and 111 are input to optical buffer memories 114 and 115, respectively. Optical waveguides 112 and 11
The output optical signal of the 2 × 2 optical space switch 109 transmitted to the optical buffer 3 is input to the optical buffer memories 116 and 117, respectively. The optical buffer memories 114 to 117 store the input optical signals and perform first-in / first-out (FI
The optical signal stored by the FO) operation is emitted. Output optical signals from the optical buffer memories 114 and 115 are output from the optical waveguide 120 via the junction 118. The output optical signals from the optical buffer memories 116 and 117 are output from the optical waveguide 121 via the junction 119.

The 2 × 4 optical self-routing circuit 103
Outputs to the control circuit 140 a detection signal 130 indicating to which optical waveguide of the optical waveguides 104 and 105 or the optical waveguides 106 and 107 the input optical cell signal has been transmitted. Output to the control circuit 140. The detection signal 130 is
2 × 4 optical self-routing circuit 10 described in detail later
3 is generated by utilizing the fact that the terminal voltage of the optical gate is different between the case where the optical signal passes through the optical gate and the case where the optical signal does not pass. The control circuit 140 detects the detection signal 130
And a counter value indicating to which of the optical buffer memories 114 or 115 the optical signal from the optical waveguide 104 or 105 was sent immediately before, and the 2 × 2 optical space switch 1
08 control signal 131 is generated. The control circuit 140
Is the optical waveguide 106 or 1 immediately before the detection signal 130.
07 from the optical buffer memory 116 or 1
17 from the counter value indicating which of
A control signal 132 for the two-light space switch 109 is generated.
Accordingly, the control circuit 140 transfers the optical signal self-routed to any one of the optical waveguides 104 and 105 by the 2 × 4 optical self-routing circuit 103 to the optical waveguide 12.
A control signal 130 of the 2 × 2 optical space switch 108 is generated which indicates which of the optical buffer memories 114 and 115 provided at 0 is incident. The control circuit 140
2 × 2 which indicates which of the optical waveguides 106 and 107 the optical signal self-routed by the 2 × 4 optical self-routing circuit 103 is incident on which of the optical buffer memories 116 and 117 provided in the optical waveguide 121 A control signal 131 for the optical space switch 109 is generated.

The 2 × 2 optical space switch 108 controls the optical waveguide 10 according to a control signal 131 from the control circuit 140.
Optical signals input via the optical waveguides 1 and 4
The signals are alternately transmitted to the optical buffer memories 114 and 115 via the lines 10 and 111. For example, the optical waveguide 104 or 10
5, one optical signal is input, and the 2 × 2 optical space switch 108 sends this optical signal to the optical buffer memory 114 in response to the control signal 131 from the control circuit 140. Next, when one optical signal is input from either the optical waveguide 104 or 105, the 2 × 2 optical space switch 108 converts this optical signal into an optical buffer in response to a control signal 131 from the control circuit 140. Send it to the memory 115. This prevents an optical signal from being stored near one of the optical buffer memories 114 and 115 provided for the optical waveguide 120.
4 and 115 can be used for storing optical signals input from the optical waveguides 101 and 102 and directed to the optical waveguide 120, and the capacity of the optical buffer memory can be reduced. In another example, one optical signal is input from either the optical waveguide 104 or 105, and the 2 × 2 optical space switch 108 converts the optical signal into an optical buffer memory 114 according to a control signal 131 from the control circuit 104. Send to Next, the optical waveguides 104 and 1
05, the 2 × 2 optical space switch 108 receives the control signal 1 from the control circuit 140.
In response to 31, the optical signal input from the optical waveguide 104 is sent to the optical buffer memory 115, the optical signal input from the optical waveguide 105 is sent to the optical buffer memory 115,
The optical signal input from the optical waveguide 105 is sent to the optical buffer memory 114. Thereby, the optical waveguides 101 and 1
When the optical signals going from 02 to the optical waveguide 120 are input simultaneously, the optical buffer memories 114 and 115 provided corresponding to the optical waveguide 120 can simultaneously store these optical signals, so that the optical buffer memories 114 and 115 can be stored.
Can avoid the competition of the optical signals. The 2 × 2 optical space switch 109, like the 2 × 2 optical space switch 108, responds to the control signal 132 from the control circuit 140 and outputs the optical waveguide 1.
The optical signals input via the optical waveguides 06 and 107 are respectively transmitted to the optical buffer memories 116 and 117 via the optical waveguides 112 and 113.
In order. The optical buffer memories 114 and 115 or 116 and 117 store the input optical signals, and transmit the optical signals stored by the first-in / first-out operation to the merger 118 or 119.

FIG. 2 is a specific configuration diagram of the 2 × 4 optical self-routing circuit 103 in FIG. In FIG.
The optical waveguides 101, 102, 104 to 107 correspond to the optical waveguides of FIG. 1, respectively, and the optical cell signals A or C, B, or D input to the optical waveguides 101, 102 are output from the optical splitters 203, 204, respectively. The light is branched into two and enters the optical gates 205, 206 and 207, 208. Optical gates 205 and 20
6, 207 and 208 output optical signals are
The light is emitted from 4, 106, 105 and 107. The electric pulse generation circuit 213 applies the same electric pulse to the optical gates 205 and 207 via the resistors 220 and 222, and supplies another electric pulse to the optical gates 206 and 208 via the resistors 221 and 223, respectively.

The detectors 230 to 233 are connected to the terminals of the optical gates 205 to 208, respectively.
30 to 233 detect whether or not the optical cell signal passes through the optical gates 205 to 208 based on the change in the terminal voltage of each of the optical gates 205 to 208, and use the detection signals 240 to 243 as the detection signal 130 in FIG. Output.

FIG. 3 is a timing chart for explaining the circuit operation of FIG. In FIG. 3, reference numeral 301
It indicates the applied electrical pulse to the optical gates 205 and 207 in FIG. 2, V _H next during time t ₁ ~t _2, keeping between t ₂ ~t ₆ V _L. 302 shows the applied electrical pulse to the optical gates 206, 208 in FIG. 2, next between V _H at time t ₂ ~t _3, kept between V _L of t ₃ ~t _6. Optical gate 20 of FIG.
The optical cell signal A incident on the 5,206 is denoted by reference numeral 303 in FIG.
Header optical signal is present only during the time t ₁ ~t ₂ as shown in FIG. Therefore, at the optical gate 205, the time of the electric pulse V _H matches the time at which the header portion optical signal exists, but the optical gate 206 does not. Therefore, the data portion of the optical cell signal A is routed to the optical waveguide 104 through only the optical gate 205. On the other hand, the optical cell signal B incident on the optical gates 207 and 208 is 3 in FIG.
Header optical signal is present only during the t ₂ ~t ₃ as shown in 04. Therefore, in the optical gate 208, the time during which the electric pulse is at V _H coincides with the time during which the header part optical signal exists, but the optical gate 207 does not. Therefore, the data portion of the optical cell signal B is routed to the optical waveguide 107 through only the optical gate 208. The optical cell signal C incident on the optical gates 205 and 206 in FIG. 2 has a header part optical signal only between times t ₁ and t ₂ as indicated by 305 in FIG. Therefore, at the optical gate 205, the time of the electric pulse V _H matches the time at which the header portion optical signal exists, but the optical gate 206 does not.
Therefore, the data portion of the optical cell signal C is routed to the optical waveguide 104 through only the optical gate 205. On the other hand, the optical cell signal D incident on the optical gates 207 and 208
As shown in 306 in FIG. 3, the header part optical signal exists only between times t ₁ and t ₃ . Therefore, the optical gate 20
7, the time during which the electric pulse is V _H coincides with the time during which the header part optical signal exists, but the optical gate 208 does not. Therefore, the data portion of the optical cell signal D is the optical gate 2
07 and is routed to the optical waveguide 105.

[0035] 2 × 4 optical self-routing circuit of FIG. 1 in this manner 103 is the header portion of the optical cell signals inputted from the optical waveguide 101 the time t ₁ ~t ₂ or t ₂ ~t
And self-routing to the optical waveguide 104 or 106 depending on whether any of the _3, also either the header portion of the optical cell signals inputted from the optical waveguide 102 is a time t ₁ ~t ₂ or t ₂ ~t ₃ Self-routing to the optical waveguide 105 or 107 depending on whether

As described above, in the optical ATM switch shown in FIG.
Two time slots in the header portion for equal to the number of output terminals of the self-routing, time t ₁ ~t ₂ and t ₂ ~
It is sufficient to prepare only t ₃ and the conventional light A having the same number of terminals
The number of required time slots can be reduced to half of the number of required time slots of 4 for the TM switch,
Therefore, the ratio of the header section in the optical cell signal can be reduced, and the throughput of the data section transfer can be improved.

FIG. 4 is a block diagram showing a second embodiment of the present invention, showing a case of two input terminals and two output terminals (2 × 2). Each wavelength lambda _1, lambda ₂ of the optical cell signals A, B or wavelengths lambda _1, lambda ₂ of the optical cell signals C, D are optical waveguides 40
1,402 to 2 × 2 optical self-routing circuit 403
Is input to 2 × 2 optical self-routing circuit 403
Is output to the variable wavelength selection elements 408 and 409 via the optical waveguide 404 and the splitter 406, or is output via the optical waveguide 405 and the splitter 407.
10, 411. Variable wavelength selection element 408 ~
The output optical signal of 411 is sent to the optical buffer memories 416 to 419 via the optical waveguides 412 to 415, respectively. The optical buffer memories 416 to 419 store the input optical signals and output the optical signals stored by the first-in / first-out operation. Output optical signals from the optical buffer memories 416 and 417 are output from the optical waveguide 422 via the junction 420, and output optical signals from the optical buffer memories 418 and 419 are output from the optical waveguide 423 via the junction 421.

2 × 2 optical self-routing circuit 403
Outputs a detection signal 430 indicating which of the optical waveguides 404 and 405 the input optical cell signal has been transmitted to. The control circuit 440 controls the control signal 431 of each of the variable wavelength selection elements 408 to 411 according to the detection signal 430.
To 434. Variable wavelength selection elements 408, 409
Selects an optical signal of a predetermined wavelength from the optical signals input respectively according to the control signals 431 and 432 from the control circuit 440 and sends the selected optical signal to the optical buffer memories 416 and 417 alternately. Further, the variable wavelength selection elements 410 and 411 select an optical signal of a predetermined wavelength from the optical signals input respectively according to the control signals 433 and 434 from the control circuit 440, and send the selected optical signal to the optical buffer memories 418 and 419. Send alternately. Optical buffer memory 416, 417 or 418,
419 stores an input optical signal,
The optical signal stored in the first-out operation is combined with the
Alternatively, it is sent to 421.

FIG. 5 is a specific configuration diagram of the 2 × 2 optical self-routing circuit 403 in FIG. In FIG.
The optical waveguides 401, 402, 404, and 405 correspond to the optical waveguides of FIG. 4, respectively, and the optical cell signals A and B or the optical cell signals C and D input to the optical waveguides 401 and 402 are respectively optical splitters 503. , 504 split into two optical gates 505,
506 and 507 and 508 are incident. Optical gate 50
The output optical signals of 5,507 are combined by the optical combiner 509 and output from the optical waveguide 404. Optical gates 506 and 508
Output optical signals are combined by an optical combiner 510 and the optical waveguide 40
5 is emitted. The electric pulse generation circuit 513 applies the same electric pulse to the optical gates 505 and 507 via the resistors 520 and 522, and supplies another electric pulse to the optical gates 506 and 508 via the resistors 521 and 523, respectively. Detectors 530 to 533 are connected to the terminals of the optical gates 505 to 508, respectively.
3 detects whether the optical cell signal passes through the optical gates 505 to 508 based on the change in the terminal voltage of each of the optical gates 505 to 508, and outputs the detection signals 540 to 543 as the detection signal 430 in FIG. .

FIG. 6 is a timing chart for explaining the circuit operation of FIG. In FIG. 6, reference numeral 601 indicates
Indicates the applied electrical pulse to the optical gates 505 and 507 in FIG. 5, the time t ₁ becomes between V _H of ~t _2, t ₂ ~t ₆ between V
Keep _L. 602 shows the applied electrical pulse to the optical gates 505 and 508 in FIG. 5, next between V _H at time t ₂ ~t _3, kept between V _L of t ₃ ~t _6. Optical gate 50 of FIG.
Wavelength lambda ₁ of the optical cell signal A which is incident to 5,506, as shown in 603 of FIG. 6, the header portion optical signal only during the time t ₁ ~t ₂ is present. Therefore, at the optical gate 505, the time of the electric pulse V _H coincides with the time at which the header portion optical signal exists, but the optical gate 506 does not.
Therefore, the data part of the optical cell signal A passes through only the optical gate 505 and is routed to the optical waveguide 404 via the optical coupler 509. On the other hand, in the optical cell signal B of the wavelength λ ₂ incident on the optical gates 507 and 508, as shown at 604 in FIG. 6, the header part optical signal exists only between times t _{2 and} t ₃ . Therefore, at the optical gate 508, the time of the electric pulse V _H coincides with the time at which the header portion optical signal exists, but the optical gate 507 does not. Therefore, the data portion of the optical cell signal B passes through only the optical gate 508 and is routed to the optical waveguide 405 via the optical coupler 510.
The wavelength λ incident on the optical gates 505 and 506 in FIG.
_As shown in 605 in FIG. 6, the optical cell signal C of ₁ has a header part optical signal only between times t _{1 and} t ₂ . Therefore, in the optical gate 505, the time of the electric pulse V _H coincides with the time of the presence of the header part optical signal.
No match at 06. Therefore, the data portion of the optical cell signal C passes through only the optical gate 505 and is routed to the optical waveguide 404 via the optical coupler 509. On the other hand, the optical cell signal D of wavelength λ ₂ which is incident on the optical gates 507 and 508
As shown in 606 in FIG. 6, the header portion optical signal exists only between times t _{1 and} t ₂ . Therefore, the optical gate 50
7, the time during which the electric pulse is V _H coincides with the time during which the header part optical signal exists, but the optical gate 508 does not. Therefore, the data portion of the optical cell signal D is
07, and is wavelength-division multiplexed with the data portion of the optical cell signal C having the wavelength λ ₁ via the optical combiner 509 and the optical waveguide 404.
Routed to

As described above, the 2 × 2 optical self-routing circuit 403 in FIG. 4 determines whether the header portion of the optical packet signal is at any of the times t _{1 to} t ₂ or t _{2 to} t ₃ . Self-routing to the optical waveguide 404 or 405. Thus, even with the optical ATM switch of FIG. 4, only _two time slots equal to the number of output terminals, times t ₁ to t ₂ and times t ₂ to t ₃ , need to be prepared in the header part for self-routing. The number of required time slots can be reduced to 1/2 compared to the required number of time slots of 4 for a conventional optical ATM switch having the same number of terminals. Therefore, the ratio of the header portion in the optical cell signal can be reduced. It is possible to improve the throughput.

FIG. 7 is a block diagram of a third embodiment of the present invention, showing the case of two input terminals and four output terminals (2 × 4). Optical cell signals A and C having wavelengths λ ₁₁ , λ ₂₁ and λ ₁₁ respectively.
And E are input from the optical waveguide 701 to the 2 × 4 optical self-routing circuit 703, and the wavelengths λ ₂₂ , λ ₁₂ and λ ₁₂
The optical cell signals B, D, and F of FIG.
The signal is input to the optical self-routing circuit 703. 2x4
The output signal of the optical self-routing circuit 703 of FIG.
2, 713, or sent to the variable wavelength selection elements 714, 715 via the optical waveguide 705, the splitter 709, or sent to the variable wavelength selection elements 716, 717 via the optical waveguide 706, the splitter 710, or An optical waveguide 707, a tunable wavelength selection element 718 via a branch 711,
719. Variable wavelength selection elements 712 to 719
Are sent to optical buffer memories 728 to 735 via optical waveguides 720 to 727, respectively. Optical buffer memories 728 to 735 store input optical signals,
The optical signal stored in the first-in / first-out operation is output. The output optical signals of the optical buffer memories 728 and 729 are output from the optical waveguide 740 via the merger 736, and the output optical signals of the optical buffer memories 730 and 731 are output from the optical waveguide 741 via the merger 737. The output optical signals of the memories 732 and 733 are output from the optical waveguide 742 via the junction 738, and the output optical signals of the optical buffer memories 734 and 735 are output from the junction 7.
The light exits from the optical waveguide 743 via 39.

2 × 4 optical self-routing circuit 703
Sends a detection signal 750 to the control circuit 760 indicating which optical waveguide among the optical waveguides 704 to 707 the input optical cell signal has been transmitted. The control circuit 760 generates control signals 751 to 758 for the variable wavelength selection elements 712 to 719 according to the detection signal 750. The variable wavelength selection elements 712 and 713 control the control signal 75 from the control circuit 760.
1, 752, an optical signal of a predetermined wavelength is selected from the optical signals input thereto, and the optical buffer memories 728, 7
29 is sent alternately. Also, the variable wavelength selection element 714,
Reference numeral 715 denotes control signals 753 and 754 from the control circuit 760.
, An optical signal having a predetermined wavelength is selected from the optical signals input respectively, and transmitted to the optical buffer memories 730 and 731 alternately. The variable wavelength selection elements 716 and 717 select optical signals of a predetermined wavelength from the optical signals input respectively according to the control signals 755 and 756 from the control circuit 760 and alternately select the optical signals into the optical buffer memories 732 and 733. Send out. Further, the variable wavelength selection elements 718 and 719 select an optical signal of a predetermined wavelength from the optical signals input respectively according to the control signals 757 and 758 from the control circuit 760, and alternately supply the optical signals to the optical buffer memories 734 and 735. Send out. The optical buffer memories 728, 729 or 730, 731 or 732, 733 or 732, 735 store the input optical signals and combine the optical signals stored by the first-in / first-out operation with the merger 736 or 737.
Alternatively, it is sent to 738 or 739.

FIG. 8 is a specific configuration diagram of the 2 × 4 optical self-routing circuit 703 in FIG. In FIG.
Optical waveguides 701, 702, 704, 705, 706, 7
07 respectively correspond to the optical waveguides of FIG.
The optical cell signal A or C or E input from 01 is divided into four by the splitter 803 and is input to the optical gates 805 to 808. The optical cell signal B, D, or F input to the optical waveguide 702 is divided into four by the splitter 804, and is input to the optical gates 809 to 812. Light gate 8
The output optical signals of the optical couplers 05 and 809, 806 and 810, 807 and 811 and 808 and 812 are respectively optical couplers 813-8.
The light is output from the optical waveguides 704, 705, 706, and 707 via the line 16. The electric signal pulse generating circuit 823 connects the optical gates 805 and 809 via the resistors 830 and 834, respectively.
Further, resistors 831 and 835 are connected to the optical gates 806 and 810, respectively.
, And to the optical gates 807 and 811, respectively.
A different electric pulse is applied to each of the two elements via the resistors 833 and 837 to the optical gates 808 and 812, respectively, through the elements 2,836. Detectors 840 to 847 are connected to the respective terminals of the optical gates 805 to 812, and the detectors 840 to 847 output the optical cell signals to the optical gates 805 to 812 by changing the terminal voltages of the optical gates 805 to 812. 8
12 is detected, and detection signals 850 to 85
7 is output as the detection signal 750 in FIG.

FIG. 9 is a timing chart for explaining the circuit operation of FIG. Reference numeral 901 denotes an optical gate 8
05 and an electrical pulse to 809, kept between V _L1 of V _H becomes t ₂ ~t ₆ between times t ₁ ~t _2. Reference numeral 902 denotes an electric pulse to the optical gates 806 and 810 at time t _1.
Kept between V _L2 of V _H becomes t ₂ ~t ₆ between ~t _2. 9
03 is an electric pulse to the optical gates 807 and 811;
Kept between V _L1 of V _H becomes t ₃ ~t ₆ between times t ₂ ~t _3. 904 is an electrical pulse to the optical gates 808 and 812, kept between V _L2 of V _H becomes t ₃ ~t ₆ between times t ₂ ~t _3. In FIG. 7, optical cell signals of wavelengths λ ₁₁ and λ ₂₁ are input one by one from an optical waveguide 701, and optical cell signals of wavelengths λ ₁₂ and λ ₂₂ are input one by one from an optical waveguide 702. The optical gates 805, 809 and 80 in FIG.
7 and 811 indicate the wavelength λ during the application of V _L1 after the header portion optical signal is applied while V _H is applied.
_11, passes the optical signal of the wavelength group lambda ₁ containing lambda _12.
Also, the optical gates 806 and 810 and 808 and 812 of FIG.
Header optical signal is transmitted through the optical signal of the wavelength groups lambda ₂ including the wavelength λ _21, λ ₂₂ while the incident hereafter V _L2 is applied between the V _H is applied.

First, the optical cell signal A having the wavelength λ ₁₁ and the wavelength λ ₂₂
An example in which the optical cell signal B of FIG. 8 is input from the optical waveguides 701 and 702 of FIG. 8 will be described. Optical gate 80
As shown by 905 in FIG. 9, the optical cell signal A having the wavelength λ ₁₁ incident on 5-808 has a header portion optical signal only between times t _{1 and} t ₂ . In the optical gates 805 and 806, the time when the electric pulse is at V _H and the time when the header part optical signal of the optical cell signal A is present coincide with each other.
808 does not match. Since transmitting the optical signal of the wavelength group lambda ₁ including the wavelength λ _11, λ ₁₂ during further light gate 805 is being applied is V _L1, data portion of the optical cell signal A and transmits only light gate 805 The light is routed to the optical waveguide 704 via the optical coupler 813. On the other hand, the optical cell signal B of wavelength λ ₂₂ incident on the optical gates 809 to 812
As shown in 906 in FIG. 9, the header part optical signal exists only between times t _{1 and} t ₂ . Optical gates 809, 810
In this case, the time during which the electric pulse is at V _H and the time during which the optical signal in the header portion of the signal B exists coincide with each other.
12 does not match. Further, the optical gate 810 controls the wavelength group Λ including the wavelengths λ ₂₁ and λ ₂₂ while V _L2 is applied.
_{Since the second} optical signal is transmitted, the data portion of the optical cell signal B is transmitted through only the optical gate 810 and is routed to the optical waveguide 705 via the optical coupler 814.

Next, the case where the optical cell signal C having the wavelength λ ₂₁ and the optical cell signal D having the wavelength λ ₁₂ are incident from the waveguides 701 and 702 will be described. The optical gates 805 to 80 of FIG.
The optical cell signal C having a wavelength λ ₂₁ incident on the light 8 of FIG.
As shown in FIG. 6, the header portion optical signal exists only between times t _{1 and} t ₂ . In the optical gates 805 and 806, the time during which the electric pulse is at V _H coincides with the time during which the header part optical signal of the optical cell signal C exists, but the optical gates 807 and 808 do not. Since transmitting the optical signal of the wavelength groups lambda ₂ including the wavelength λ _21, λ ₂₂ while being further optical gate 806 is applied V _L2, the data part of the optical cell signals C is transmitted through only light gate 806 The light is routed to the optical waveguide 705 via the optical coupler 814. On the other hand, optical gates 809-
The optical cell signal D having the wavelength λ ₁₂ incident on the light source 812 is denoted by 9 in FIG.
As shown in 07, the header portion optical signal only during the time t ₂ ~t ₃ is present. In the optical gates 811 and 812, the time when the electric pulse is at V _H and the time when the header part optical signal of the optical cell signal D exists coincide with each other.
Does not match. Since transmitting the optical signal of the wavelength group lambda ₁ including the wavelength λ _11, λ ₁₂ during further light gate 811 is being applied is V _L1, data portion of the optical cell signals D are each transmitting only light gate 811 The light is routed to the optical waveguide 706 via the optical coupler 815.

Further, the optical cell signal E having the wavelength λ ₂₁ and the wavelength λ ₂₂
The case where the optical cell signal F is input from the optical waveguides 701 and 702 will be described. The optical gate 805 of FIG.
As shown in 909 in FIG. 9, the optical cell signal E of wavelength λ ₂₁ incident on 808 has a header part optical signal only between times t _{2 and} t ₃ . In the optical gates 807 and 808, the time when the electric pulse is at V _H and the time when the optical signal of the header portion of the optical cell signal E exists coincide with each other.
No match at 6. Further, the optical gate 808 controls the wavelength group Λ ₂ including the wavelengths λ ₂₁ and λ ₂₂ while V _L2 is applied.
Therefore, the data portion of the optical cell signal E passes through only the optical gate 808 and is routed to the optical waveguide 707 via the optical coupler 816. On the other hand, the optical gate 80
Optical cell signals F of a wavelength lambda ₂₂ is incident to 9-812, as shown in 910 of FIG. 9, the header portion optical signal only during the time t ₂ ~t ₃ is present. In the optical gates 811 and 812, the time during which the electric pulse is at V _H and the time during which the header part optical signal of the optical cell signal F exists coincide with each other.
10 does not match. Further, the optical gate 812 controls the wavelength group Λ including the wavelengths λ ₂₁ and λ ₂₂ while V _L2 is applied.
_{Since the second} optical signal is transmitted, the data portion of the optical cell signal F is transmitted only through the optical gate 812 and is routed to the optical waveguide 707 via the optical coupler 816. In this case, the optical cell signals E and F are wavelength-multiplexed by the optical coupler 816 and are simultaneously self-routed to the optical waveguide 707.

As described above, the 2 × 4 optical self-routing circuit 703 shown in FIG. 7 operates at the time t ₁ to t ₂ or t _{2 to} t _{3 at} which the header of the optical cell signal exists and the wavelength to which the wavelength of the optical cell signal belongs. The optical signal is self-routed to the optical waveguides 704 to 707 according to the combination with the group # ₁ or # ₂ . Therefore, according to the optical ATM switch of FIG. 7, 1 / g of the number of output terminals (g is the number of wavelength groups, in this example, g =
Time slot 2), it is sufficient to prepare only t ₁ ~t ₂ and t ₂ ~t _3. Therefore, the number of time slots required can be reduced to 1/4 of the number of time slots 8 required for the optical ATM switch having the same number of terminals, and the ratio of the header portion in the optical cell signal can be reduced to improve the throughput. It is possible to improve.

FIG. 10 is a block diagram showing a fourth embodiment of the present invention, showing a case of two input terminals and two output terminals (2 × 2). The data part optical signals A and B are
Distribution circuits 1003, 10
04. The distribution circuit 1003 outputs the optical cell signal A obtained by adding the destination information to the input data signal optical signal A via the optical waveguide 1005 or 1007 to 2 × 4.
Optical self-routing circuit 1009 or 1010
To either one of Also, the distribution circuit 1004
Converts the optical cell signal B obtained by adding the destination information to the input data signal optical signal B to the optical waveguide 1006 or 100
8 to the 2 × 4 optical self-routing circuit 1009 or 1010.

2 × 4 optical self-routing circuit 1009
Is output to the combining circuits 1019 and 1020 via the optical waveguides 1011 and 1013, respectively.
The synthesizing circuits 1021 and 1022 via
Sent to 2 × 4 optical self-routing circuit 1
The output optical signal 010 is sent to the combining circuits 1019 and 1020 via the optical waveguides 1012 and 1014, respectively, or to the optical waveguide 1
016, 1018 via the synthesis circuits 1021, 102
2 is sent.

The combined output optical signals of the combining circuits 1019 and 1020 are 2 ×
Sent to the two-optical space switch 1027, and
Output optical signals of the optical waveguides
5, 1026 to the 2 × 2 optical space switch 1028. 2 sent to optical waveguides 1029 and 1030
Output optical signals of the × 2 optical space switch 1027 are input to the optical buffer memories 1033 and 1034, respectively. The output optical signals of the 2 × 2 optical space switch 1028 sent to the optical waveguides 1031 and 1032 are respectively supplied to the optical buffer memories 103.
5,1036. Optical buffer memory 1033
Numerals 1036 to 1036 store the input optical signal, and emit the stored optical signal by the first-in / first-out operation. The output optical signals of the optical buffer memories 1033 and 1034 are output from the optical waveguide 1039 via the merger 1037. The output optical signals of the optical buffer memories 1035 and 1036 are output from the optical waveguide 1040 via the merger 1038.

2 × 4 optical self-routing circuit 100
Reference numerals 9 and 1010 denote input optical cell signals, respectively, in the optical waveguide 1.
011, 1013, 1015, 1017 or detection signals 1050, 105 indicating which of the optical waveguides among the optical waveguides 1012, 1014, 1016, and 1018 has been transmitted.
Outputs 1. The control circuit 1070 detects the detection signal 105
0, 1051, 2 × 2 optical space switch 1027,
The control signals 1060 and 1061 of 1028 are generated.
The 2 × 2 optical space switch 1027 responds to a control signal 1060 from the control circuit 1070 to control the optical waveguides 1023, 102
The optical signals respectively input via the optical waveguides 10
The data is alternately transmitted to the optical buffer memories 1033 and 1034 via 1030. The 2 × 2 optical space switch 1028 converts the optical signals input via the optical waveguides 1024 and 1026 in accordance with the control signal 1061 from the control circuit 1070,
Optical buffer memory 1 via optical waveguides 1031 and 1032
035, 1036. The optical buffer memories 1033, 1034 or 1035, 1036 store the input optical signals and combine the optical signals stored by the first-in / first-out operation with the merger 1037 or 1037.
38.

FIG. 11 shows the distribution circuit 100 in FIG.
3, 2 × 4 optical self-routing circuits 1009, 101
9 is a timing chart for explaining the operation of the synthesizing circuit 1019. In FIG. 11, reference numeral 1101
Is a data part optical signal input to the distribution circuit 1003 in FIG. 10, and three types of data signals D1 to D3 are multiplexed on the time axis. The distribution circuit 1003 inputs the data part optical signals D1 to D3 and their destination information, and adds the header part optical signals H1 to H3 to the data part optical signals D1 to D3 according to the destination information, respectively. 3 and sends the optical cell signals 1 and 3 to the 2 × 4 optical self-routing circuit 1009 as shown by 1102 and sends the optical cell signal 2 to the 2 × 4 optical self-routing circuit 1010 as shown by 1103. .

The optical self-routing circuit 1009 outputs the header optical signals H1 and H of the optical cell signals 1 and 3 to be inputted.
In accordance with 3, the data part optical signals D1 and D3 are self-routed, and the data part optical signals D1 and D3 indicated by 1104, for example, are sent to the combining circuit 1019. The optical self-routing circuit 1010 self-routes the data part optical signal D2 according to the header optical signal H2 of the optical cell 2 to be inputted, for example, the data part optical signal D2 shown in 1105.
Is also sent to the synthesis circuit 1019. Synthesis circuit 101
9, 1104 and 1105 are input and synthesized, so as shown by 1106 the data part optical signal D1
To D3 are output from the synthesis circuit 1019.

As described above, in FIG. 10, a plurality of optical self-routing circuits are used, and while one optical self-routing circuit is transferring the data portion of the optical cell signal, another optical self-routing circuit is used for the next optical self-routing circuit. Since the processing of the header portion of the optical cell signal is performed, the effective throughput is improved.

FIG. 12 is a block diagram of a fifth embodiment of the present invention, showing the case of two input terminals and two output terminals (2 × 2). The data part optical signals A and B having the wavelengths λ ₁ and λ ₂ are input from the optical waveguides 1201 and 1202 and sent to the distribution circuits 1203 and 1204. Distribution circuit 120
Reference numeral 3 denotes an optical cell signal A obtained by adding destination information to the input data signal optical signal A of wavelength λ ₁ to either the 2 × 2 optical self-routing circuit 1209 or 1210 via the optical waveguide 1205 or 1207. Send out. Further, the distribution circuit 1204 converts the optical cell signal B obtained by adding the destination information to the input data signal optical signal B of wavelength ₂ via the optical waveguide 1206 or 1208 to 2 × 2.
The signal is sent to either the optical self-routing circuit 1209 or 1210.

2 × 2 optical self-routing circuit 1209
Is output from the combining circuit 12 via the optical waveguide 1211.
15 or through the optical waveguide 1213
16 is sent. The output optical signal of the 2 × 2 optical self-routing circuit 1210 is sent to the combining circuit 1215 via the optical waveguide 1212 or to the combining circuit 1216 via the optical waveguide 1214.

The output optical signal of the synthesizing circuit 1215 is sent to the variable wavelength selecting elements 1219 and 1220 via the splitter 1217, and the output optical signal of the synthesizing circuit 1216 is output to the splitter 1
The signal is transmitted to the variable wavelength selection elements 1221 and 1222 via 218. The output optical signals of the variable wavelength selection elements 1219 to 1222 are sent to the optical buffer memories 1227 to 1230 via the optical waveguides 1223 to 1226, respectively. The optical buffer memories 1227 to 1230 store the input optical signals and output the optical signals stored by the first-in / first-out operation. Optical buffer memories 1227 and 122
The output optical signal of No. 8 is transmitted to the optical waveguide 123 via the merger 1231.
3 and the optical buffer memories 1227 and 1227
The output optical signal of the optical waveguide 30
It is emitted from 34.

2 × 2 optical self-routing circuit 1209
Alternatively, reference numeral 1210 denotes a detection signal 124 indicating to which optical waveguide of the optical waveguides 1211, 1213 or 1212, 1214 the input optical cell signal has been transmitted.
0, 1241 are output. The control circuit 1260 responds to the detection signals 1240 and 1241 by using the variable wavelength selection element 1219.
To 1222 are generated. The variable wavelength selection elements 1219 and 1220 select an optical signal of a predetermined wavelength from the optical signals input respectively according to the control signals 1250 and 1251 from the control circuit 1260, and send them to the optical buffer memories 1227 and 1228. .
Further, the variable wavelength selection elements 1221 and 1222 select an optical signal of a predetermined wavelength from the optical signals respectively input according to the control signals 1252 and 1253 from the control circuit 1260 and send the selected optical signal to the optical buffer memories 1229 and 1230. Send out. Optical buffer memory 1227, 1228 or 12
Reference numerals 29 and 1230 store the input optical signals, and transmit the stored optical signals to the merger 1231 or 1232 by the first-in / first-out operation. Note that 2 × 2
The configurations of the optical self-routing circuits 1209 and 1210 are the same as those shown in FIG.

FIG. 13 shows the distribution circuit 120 in FIG.
3, 2 × 2 optical self-routing circuits 1209, 121
11 is a timing chart for explaining the operation of the synthesizing circuit 12 and 0. In FIG. 13, reference numeral 1301
Is the wavelength λ input to the distribution circuit 1203 in FIG.
₁ data signal and three types of data signals D1 to D3.
Are multiplexed on the time axis. The distribution circuit 1203 inputs the data signals D1 to D3 and the destination information, adds header optical signals H1 to H3 according to the destination information, generates optical cell signals 1 to 3, and generates an optical cell signal as shown in 1302. 2 × 2 optical self-routing circuit 1209 for signals 1 and 3
And transmits the optical cell signal 2 to a 2 × 2
The signal is sent to the optical self-routing circuit 1210. The optical self-routing circuit 1209 receives the input optical cell signal 1
Self-routing of the data part optical signals D1 and D3 according to the header optical signals H1 and H3 of
In FIG. 15, for example, data part optical signals D1 and D3 shown in 1304
Is sent. Also, the optical self-routing circuit 1210
Self-routes the data part optical signal D2 according to the header optical signal H2 of the optical cell 2 to be inputted, and also converts the data part optical signal D2 shown in 1305 to the combining circuit 1 again.
215. The combining circuit 1215 has 1304 and 13
Since the optical signals shown in FIG. 05 are input and synthesized, as shown in 1306, the data part optical signals D1-D3 are
215.

As described above, also in the case of FIG. 12, a plurality of optical self-routing circuits are used while one optical self-routing circuit transfers the data portion of the optical cell signal.
Since the other optical self-routing circuit processes the header of the next optical cell signal, the effective throughput is improved.

FIG. 14 is a block diagram of a sixth embodiment of the present invention, showing the case of two input terminals and four output terminals (2 × 4). The optical signals A and C of the data portions having the wavelengths λ ₁₁ and λ ₂₁ are input one by one from the optical waveguide 1401, and the distribution circuit 1
403, and data part optical signals B and D of wavelengths λ ₁₂ and λ ₂₂ are input one by one from the optical waveguide 1402 and transmitted to the distribution circuit 1404. Distribution circuit 14
Numeral 03 designates an optical cell signal A obtained by adding destination information to the input data signal optical signal A of wavelength λ ₁₁ via the optical waveguide 1405 or 1407 to the 2 × 4 self-routing circuit 1.
409 and 1410 are sent. Also, the distribution circuit 1403 transmits the optical cell signal C obtained by adding the destination information to the input data optical signal C of the wavelength λ ₂₁ to one of the 2 × 4 optical self-routing circuits 1409 and 1410 via the optical waveguide 1403 or 1407. Send out. The distributing circuit 1404 converts the optical cell signal B obtained by adding the destination information to the input data signal optical signal B of the wavelength λ ₁₂ via the optical waveguide 1406 or 1408 to 2 × 4.
The signal is sent to one of the optical self-routing circuits 1409 and 1410. Further, the distribution circuit 1404 converts the optical cell signal D obtained by adding the destination information to the input data optical signal D of the wavelength λ ₂₂ to the optical waveguide 1406 or 1408.
2x4 optical self-routing circuit 1409, 14 via
10 to send to.

2 × 4 optical self-routing circuit 1409
The output optical signal of is output from the combining circuit 14 via the optical waveguide 1411.
19 or via the optical waveguide 1413
20 or via the optical waveguide 1415
21 or via the optical waveguide 1417
22, respectively. The output optical signal of the 2 × 4 optical self-routing circuit 1410 is sent to the combining circuit 1419 via the optical waveguide 1412, to the combining circuit 1420 via the optical waveguide 1414, to the combining circuit 1421 via the optical waveguide 1416, or to the optical waveguide. Each of them is sent to the combining circuit 1422 via 1418. Synthesis circuit 1
The combined output optical signal 419 is sent to the variable wavelength selection elements 1427 and 1428 via the splitter 1423, and the combined circuit 1
The output optical signal of 420 is sent to the variable wavelength selecting elements 1429 and 1430 via the splitter 1424,
1 is sent to the tunable wavelength selection elements 1431 and 1432 via the splitter 1425, and the output optical signal of the combining circuit 1422 is sent to the tunable wavelength selection element 1 via the splitter 1426.
433, 1434. Variable wavelength selection element 14
The output optical signals of the optical waveguides 27 to 1434 are respectively connected to the optical waveguides 1435.
Optical buffer memories 1443-1450 via １４1442
Sent to

The optical buffer memories 1443 to 1450 store the input optical signals, and output the optical signals stored by the first-in / first-out operation. The optical signals output from the optical buffer memories 1443 and 1444 are combined by a combiner 1451.
The optical signals output from the optical waveguides 1445 and 1446 are output from the optical waveguide 1456 via the merger 1452, and the optical signals output from the optical buffer memories 1447 and 1448 are output via the optical combiner 1453 via the optical waveguide 1455. Output from the optical buffer memory 1
Output optical signals of 449 and 1450 are output from the optical waveguide 1458 via the merger 1454.

The 2 × 4 self-routing circuit 1409 or 1410 converts the input optical cell signals into optical waveguides 1411, 1413, 1415, 1417 or 1 respectively.
Detection signals 1460 and 1461 indicating which of the optical waveguides 412, 1414, 1416 and 1418 have been transmitted.
Is output. The control circuit 1480 outputs the detection signals 1460, 1
In response to 461, control signals 1470 to 1477 for the variable wavelength selection elements 1427 to 1434 are generated. The variable wavelength selection elements 1427 and 1428 select an optical signal of a predetermined wavelength from the optical signals input respectively according to control signals 1470 and 1471 from the control circuit 1480, and send them to the optical buffer memories 1443 and 1444. The variable wavelength selection elements 1429 and 1430 select an optical signal of a predetermined wavelength from the optical signals input respectively according to the control signals 1472 and 1473 from the control circuit 1480, and send them to the optical buffer memories 1445 and 1446. . The variable wavelength selection elements 1431 and 1432 select optical signals of a predetermined wavelength from the optical signals respectively input according to the control signals 1474 and 1475 from the control circuit 1480, and send them to the optical buffer memories 1447 and 1448. . Further, the variable wavelength selection elements 1433 and 1434 select an optical signal of a predetermined wavelength from the optical signals input respectively according to the control signals 1476 and 1477 from the control circuit 1480 and send them to the optical buffer memories 1449 and 1450. . Optical buffer memory 1
443, 1444 or 1445, 1446 or 1447, 1448 or 1449, 1450 store the input optical signal and combine the optical signal stored by the first-in / first-out operation with the merger 1451 or 1
452 or 1453 or 1454.
The 2 × 4 optical self-routing circuits 1409 and 141
The configuration of 0 is the same as that shown in FIG.

FIG. 15 shows the distribution circuit 140 in FIG.
3, 2 × 4 optical self-routing circuits 1409, 141
11 is a timing chart for explaining the operation of the combining circuit 14 and 0. In FIG. 15, reference numeral 1501
Is the wavelength 1 input to the distribution circuit 1403 in FIG.
And three types of data signals D1 to D3.
Are multiplexed on the time axis. Distribution circuit 1403
Receives the data signal D1~D3 and destination information, and generates an optical cell signal to third wavelength lambda ₁₁ adds a header portion optical signal H1~H3 each in accordance with the destination information, as shown in 1502 The optical cells 1 and 3 are sent to the 2 × 4 optical self-routing circuit 1409, and the optical cell signal 2 is sent to the 2 × 4 optical self-routing circuit 1410 as shown by 1503. The optical self-routing circuit 1409 self-routes the data part optical signals D1 and D3 in accordance with the respective header part optical signals H1 and H3 of the optical cell signals 1 and 3, which are input to the combining circuit 1410. Transmits an optical signal. The optical self-routing circuit 14
10 self-routes the data portion optical signal D2 in accordance with the header portion optical signal H2 of the input optical cell signal 2, and, for example, also converts the data portion optical signal shown by 1505 into the combining circuit 1
419. The combining circuit 1419 is composed of 1504 and 15
Since the optical signals shown in FIG. 05 are input and synthesized, the data part optical signals D1 to D3
419.

As described above, also in the case of FIG. 14, a plurality of optical self-routing circuits are used while one optical self-routing circuit transfers the data portion of the optical cell signal.
Since the other optical self-routing circuit processes the header of the next optical cell signal, the effective throughput is improved.

FIG. 16 is a block diagram showing a seventh embodiment of the present invention. The figure shows the case of two input terminals and two output terminals (2 × 2) when there are two types of optical cell signals, that is, when the optical cell signals are given two priorities of high priority and low priority. Is shown. The optical cell signals A and B enter the 2 × 4 optical self-routing circuit 1603 from the optical waveguides 1601 and 1602, respectively. The optical signal output from the optical self-routing circuit 1603 is transmitted to the optical waveguides 1604 and 160
5 to the 2 × 2 optical space switch 1608 or via the optical waveguides 1606 and 1607 to the 2 × 2 optical space switch 1
609. Output optical signals of the 2 × 2 optical space switch 1608 sent to the optical waveguides 1610 and 1611 are sent to the 1 × 2 optical space switches 1614 and 1615, respectively. 2 sent to optical waveguides 1612 and 1613
The output optical signal of the × 2 optical space switch 1609 is 1 ×
The light is transmitted to the two-light space switches 1616 and 1617. 1
The output terminals of the × 2 optical space switches 1614 to 1617 include:
Optical buffer memories 1618 and 1619, 1620 and 16
21, 1622 and 1623 and 1624 and 1625 are respectively connected.

The optical buffer memories 1618 to 1625 store the input optical signals and emit the stored optical signals by the first-in / first-out operation. The optical buffer memories 1618, 1620, 1622, and 1624 are optical buffer memories dedicated to high priority optical cells, and the optical buffer memories 1619, 1621, 1623, and 1625 are optical buffer memories dedicated to low priority optical cells. The output optical signals of the optical buffer memories 1618 and 1620 are sent to the optical space switch 1630 via the junction device 1626, and the output optical signals of the optical buffer memories 1619 and 1621 are output to the junction device 1627.
Is also sent to the optical space switch 1630 via
The output optical signals of the optical buffer memories 1622 and 1624 are sent to the optical space switch 1631 via the merger 1628, and the output optical signals of the optical buffer memories 1623 and 1625 are sent to the optical space switch 1631 via the optical space switch 1629. You. Optical space switch 1630,1
631 self-routes optical signals to optical waveguides 1632 and 1633, respectively.

2 × 4 optical self-routing circuit 1603
Converts input optical cell signals into optical waveguides 1604 and 160
5 or a detection signal 1640 indicating which optical waveguide of the optical waveguides 1606 and 1607 has been transmitted. The control circuit 1670 responds to the detection signal 1640 by 2
Control signal 1 for × 2 optical space switches 1608 and 1609
650 and 1651 are generated.

The 2 × 2 optical space switch 1608 controls the optical waveguide 1 according to a control signal 1650 from the control circuit 1670.
The optical signals input via the optical waveguides 604 and 1605 are respectively transmitted to the 1 × 2 optical space switch 1 via the optical waveguides 1610 and 1611.
614 and 1615 in order. The 2 × 2 optical space switch 1609 controls the control signal 16 from the control circuit 1670.
The optical signals input via the optical waveguides 1606 and 1607 according to 51 are sequentially transmitted to the 1 × 2 optical space switches 1616 and 1617 via the optical waveguides 1612 and 1613.

1 × 2 optical space switches 1614 to 1617
Converts the optical signal into the optical buffer memory 16 for the high-priority optical cell according to the header bit indicating the priority of the input optical signal
18, 1620, 1622, 1624 or optical buffer memories 1619, 1621, 162 for low priority optical cells
Self-routing to either of 3,1625. Optical buffer memories 1618 and 1620, 1619 and 162
1, 1622 and 1624, 1623 and 1625 store the input optical signals, and combine the optical signals stored by the first-in / first-out operation with the mergers 1626 and 162, respectively.
7, 1628 and 1629.

FIG. 17 shows a specific configuration of the 1 × 2 optical space switches 1614 to 1617 in FIG. Optical waveguide 1
The optical signal A or B input from 701 is
02 to optical gates 1703 and 1704.
Output optical signals from the optical gates 1703 and 1704 are output from optical waveguides 1705 and 1706, respectively. The electric pulse generation circuit 1707 applies and supplies electric pulses at different timings to the optical gates 1703 and 1704.

FIG. 18 is a timing chart for explaining the circuit operation of FIG. 18, reference numeral 1801 denotes an applied electrical pulse to the optical gates 1703, V _H next during time t ₃ ~t _4, between t ₄ ~t ₈ V
Keep _L. The 1802 represents the applied electrical pulse to the optical gates 1704, V _H next during time t ₄ ~t _5, t ₅
Keep between V _L of ~t _8. The optical gate 1703,1 of FIG.
Optical signal A which is incident to 704, as shown in 1803 of FIG. 18, there is a header section optical signal indicating a high priority only during the time t ₃ ~t _4, between times t ₆ ~t ₇ The data part optical signal is present. Therefore, in the optical gate 1703, the time when the electric pulse is at V _H coincides with the time when the header portion optical signal indicating the high priority exists, but the optical gate 1704 does not. Therefore, the data part optical signal of the optical signal A passes through only the optical gate 1703 and is self-routed to the optical waveguide 1705. Also, the optical gate 1703 of FIG.
As shown in 1804 in FIG. 18, the optical signal B incident on the 1704 has a header optical signal indicating a low priority only between times t ₄ and t ₅ , and the data portion between times t _{6 and} t _7. There is an optical signal. Therefore, at the optical gate 1704, the time when the electric pulse is at V _H coincides with the time when the header part optical signal indicating the low priority exists, but the optical gate 1703 does not. Therefore, the data part optical signal of the optical signal B passes only through the optical gate 1704 and is self-routed to the optical waveguide 1706. The times t _{1 to} t ₂ or t _{2 to} t ₃ of the optical signals A and B in FIG. 18 indicate time slots to which the header optical signal for the 2 × 4 optical self-routing circuit 1603 in FIG. 16 is attached. I have.

FIG. 21 shows the optical space switch 163 in FIG.
It is a block diagram of 0,1631, and shows the case of 2 inputs and 1 output as an example. In FIG. 21, the optical cell signals A,
B enters the optical waveguides 2100 and 2101 and is sent to the optical gates 2110 and 2111, respectively. Optical gate 211
Output optical signals from 0,2111 are combined by an optical combiner and output from an optical waveguide 1632 (1633). Electric pulse generation circuit 2130 and optical gates 2110, 211
1 is connected via a resistor 2140.

FIGS. 22A to 22D are timing charts for explaining the circuit operation of the optical space switches 1630 and 1631 in FIG. FIG. 7A shows a resistor 214.
Shows the voltage applied to 0, next V _H0 between times t ₁ ~t _2, between V _L0 of time t ₂ ~t ₇ kept. (B) shows the voltage applied to the optical gates 2110-2111,
Keeping the V _H1 between times _{t 1 ~t 2 (V H1 <} V H0) _{becomes, V L1 (V L1 <V} L0) between time t ₂ ~t ₇ by. The optical cell signals A and B incident on the optical gates 2110 and 2111 respectively have time t ₁ as shown in FIGS.
~t ₂ each P ₁ light amount _{to, P 2 (P 1> P} 2) at which the header portion light signal, also the time t ₅ ~t ₆ data unit optical signal exists in. In the optical gates 2110 and 2111 into which the optical cell signals A and B are respectively incident, the time when the applied voltage is V _H1 and the time when the header part optical signals of the optical cell signals A and B exist are from time t ₁ to time t ₁ . to match the t _2. Further, since the light amount P ₁ of the header portion optical signal of the optical cell signal A is larger than the light amount P ₂ of the header portion optical signal of the optical cell signal B, the optical gate 21
Reference numeral 10 switches to an operation state in which the optical signal of the subsequent data portion is transmitted earlier than the other optical gates 2111. Light gate 2
When 110 transitions to this operating state, optical gate 2110
The voltage applied to the optical gate 2111 decreases due to a voltage drop due to the injection current and the resistor 2140, and the optical gate 2111 can no longer transmit the subsequent data signal. By the operation of the optical gates 2110 and 2111, the optical cell signal A
Only the data signal of the data portion is self-routed to the optical waveguide 2102 via the optical combiner 1632 through the optical gate 2110.

As described above, the optical switch shown in FIG. 21 uses the optical gate which operates with priority according to the magnitude of the light quantity of the optical signal in the header of the optical cell signal. Even if a collision occurs, one optical cell signal can be output preferentially.

FIGS. 23A to 23D are other timing charts for explaining the operation of the optical space switches 1630 and 1631 in FIG. FIG. 3A shows a resistor 21.
Shows the voltage applied to the 40, next V _H0 between times t ₁ ~t _3, between V _L0 of time t ₃ ~t ₆ kept. (B) shows the voltage applied to the optical gates 2110 and 2111 and the resistance 2140
V _H1 (V during still the time t ₁ ~t ₃ by
_H1 <V _H0) next, between V _L1 (V _L1 at time t ₃ ~t ₆ <V
_L0 ). Optical cell signals A, each of which is incident on the optical gates 2110 and 2111, each of the B (c), is as shown in (d), the time _{t 1 ~t 2, t 2 ~t} 3 amount in the P ₁ header optical signal, and the data unit optical signal at time t ₄ ~t ₅ is present. Optical cell signals A, B are each applied voltage in the optical gates 1910,1911 incident are each V _H1 time t ₁ ~t ₃ to the optical cell signals A, header optical signal B are all present. Further, the optical signal of the header portion of the optical cell signal A is faster than the optical signal of the header portion of the optical cell signal B.
Since the light is incident on the optical gate 2110, the optical gate 2110 switches earlier than the other optical gates 2111 in the operating state that transmit the subsequent data signal. When the optical gate 2110 shifts to the operating state, the injection current to the optical gate 2110 increases, and the voltage applied to the optical gate 2111 decreases due to the voltage drop due to the injection current and the resistor 2140. Cannot be transmitted. By the operation of the optical gates 2110 and 2111, only the data part optical signal of the optical cell signal A passes through the optical gate 2110 and is self-routed to the optical waveguide 2102 via the optical coupler 2120.

As described above, the optical space switch shown in FIG. 21 can also use the two-input one-input by using the optical gate that operates with priority according to the time difference added to the header part optical signal of the optical cell signal.
Even if a collision of optical cell signals occurs between outputs, one optical cell signal can be output preferentially.

As described above, in the case of FIG. 16, the number of time slots required for the self-routing header portion is reduced, and the priority control for the optical cell signal having a time slot equal to the number of priorities is performed. By allocating the header section, priority control of outputting optical signals from the output terminals in an order according to the header section for priority control can also be performed.

FIG. 19 is a block diagram of an embodiment of the eighth invention of the present invention, and shows a case where two priorities of high priority and low priority are assigned to an optical cell signal. Wavelength λ ₁ ,
The optical cell signals A and B of λ ₂ are
2 to 2 × 2 optical self-routing circuit 1903 is input. The output optical signal of the 2 × 2 optical self-routing circuit 1903 is sent to the variable wavelength selection elements 1908 and 1909 via the optical waveguide 1904 and the splitter 1906, or is output to the variable wavelength selection element 1910 via the optical waveguide 1905 and the splitter 1907. It is sent to 1911. The output optical signals of the variable wavelength selection elements 1908 to 1911 are transmitted via the optical waveguides 1912 to 1915, respectively, to the 1 × 2 optical space switch 191.
6 to 1919. 1 × 2 optical space switch 19
Optical buffer memory 1920 is provided at the output terminals of 16-1919.
And 1921, 1922 and 1923, 1924 and 192
5 and 1926 and 1927 are respectively connected.

The optical buffer memories 1920 to 1927 are
The incident optical signal is stored, and the stored optical signal is emitted by the first-in / first-out operation. Optical buffer memories 1920, 1922, 1924, and 1926 are optical buffer memories dedicated to high priority optical cells, and optical buffer memories 1921, 1923, 1925, and 1927 are optical buffer memories dedicated to low priority optical cells. The optical signals output from the optical buffer memories 1920 and 1922 are
8 to the optical space switch 1932 and output optical signals from the optical buffer memories 1921 and 1923
Also transmitted to the optical space switch 1932 via 29. The output optical signals of the optical buffer memories 1924 and 1926 are sent to the optical space switch 1933 via the merger 1930, and the output optical signals of the optical buffer memories 1925 and 1927 are also transmitted to the optical space switch 1 via the merger 1931.
933. Optical space switches 1932 and 193
3 self-routes optical signals to optical waveguides 1934 and 1935, respectively.

2 × 2 optical self-routing circuit 1903
Converts input optical cell signals into optical waveguides 1904 and 190
5 is a detection signal 19 indicating to which optical waveguide it is transmitted.
40 is output. The control circuit 1970 detects the detection signal 194
In response to 0, control signals 1950 to 1953 to the variable wavelength selection elements 1908 to 1911 are generated. The variable wavelength selection elements 1908 and 1909 select an optical signal of a predetermined wavelength from the optical signals respectively input according to the control signals 1950 and 1951 from the control circuit 1970, and 1 × 2 optical space switches 1916 and 1917. Send to The variable wavelength selection elements 1910 and 1911 are provided with a control circuit 1970
The optical signal having a predetermined wavelength is selected from the optical signals input according to the control signals 1952 and 1953 from
The two optical space switches 1918, 1919 are sent.

1 × 2 optical space switches 1916 to 1919
Converts the optical signal into a high-priority optical cell optical buffer memory 19 according to the header bit indicating the priority of the input optical signal.
20, 1922, 1924, 1926 or optical buffer memories 1921, 1923, 192 for low priority optical cells
Self-routing to either 5,1927.
Optical buffer memories 1920 and 1922, 1921 and 19
Reference numerals 23, 1924 and 1926, and 1925 and 1927 store input optical signals, respectively.
To 31. The 2 × 2 optical self-routing circuit 1903 and the variable wavelength selection elements 1908 to 1908 in FIG.
Reference numeral 911 denotes a 2 × 2 optical self-routing circuit 4 in FIG.
03, the same configuration as the variable wavelength selection elements 408 to 411. Further, the 1 × 2 optical space switch 1916 in FIG.
1919 and the optical space switches 1932 and 1933 are:
Each has the same configuration as that shown in FIGS. 17 and 21.

As described above, also in the case of FIG. 19, the number of time slots required for the self-routing header section is reduced, and the priority control header section having a time slot equal to the number of priorities in the optical cell signal. , Priority control of outputting optical signals from output terminals in an order corresponding to the header portion for priority control can also be performed.

FIG. 20 is a block diagram of a ninth embodiment of the present invention, in which the optical cell signals are also given two priorities of high priority and low priority. The optical cell signals A, C and E having wavelengths λ ₁₁ , λ ₂₁ and λ ₁₁ respectively are supplied from the optical waveguide 2001 to the 2 × 4 self-routing circuit 2003.
Is input to and the wavelength λ _22, λ ₁ 2 and lambda ₁₂ of optical cell signals B, D and F are inputted from the optical waveguide 2002 to the 2 × 4 optical self-routing circuit 2003. The output signal of the 2 × 4 optical self-routing circuit 2003 is
004, tunable wavelength selection element 201 via splitter 2008
2, 2013, or via the optical waveguide 2005 and the splitter 2009.
5 or optical waveguide 2006, branch 201
It is sent to the variable wavelength selection elements 2018 and 2019 via the optical waveguide 20073 branching device 2011 or to the variable wavelength selection elements 2018 and 2019 via the optical waveguide 20073. Output optical signals from the tunable wavelength selection elements 2012 to 2019 are sent to the 1 × 2 optical space switches 2028 to 2035 via the optical waveguides 2020 to 2027, respectively. The output terminals of the 1 × 2 optical space switches 2028 to 2035 are provided with optical buffer memories 2036 and 2037, 2038 and 2039, 2040 and 2041, 2042 and 2043, 2044 and 2045,
2046 and 2047, 2048 and 2049, 2050 and 2051 are connected respectively. Optical buffer memory 20
36 to 2051 store the input optical signal and output the optical signal stored by the first-in / first-out operation. Optical buffer memories 2036 and 2038, 204
0 and 2042, 2044 and 2046, 2048 and 205
Reference numeral 0 denotes an optical buffer memory dedicated to the high-priority optical cell, and optical buffer memories 2037 and 2039 and 2041 and 2039.
Reference numerals 43, 2045 and 2047, and 2049 and 2051 denote optical buffer memories dedicated to low priority optical cells. The optical signals output from the optical buffer memories 2036 and 2038 are
The optical signals output from the optical buffer memories 2037 and 2039 are transmitted to the optical space switch 2006 through the
3 to the optical space switch 2060. Output optical signals from the optical buffer memories 2040 and 2042 are sent to the optical space switch 2061 via the merger 2054.
The optical signals output from the optical buffers 2041 and 2043 are output to the
It is sent to the optical space switch 2061 via 055. The output optical signals of the optical buffer memories 2044 and 2046 are sent to the optical space switch 2062 via the merger 2056.
Output optical signals from the optical buffer memories 2045 and 2047 are sent to the optical space switch 2062 via the merger 2057. The output optical signals of the optical buffer memories 2048 and 2050 are sent to the optical space switch 2063 via the merger 2058, and the output optical signals of the optical buffer memories 2049 and 2051 are transmitted via the merger 2059.
Sent to Optical space switches 2060-2063 are:
The optical signal is self-routed to each of the optical waveguides 2064 to 2067.

2 × 4 optical self-routing circuit 2003
Converts input optical cell signals into optical waveguides 2004 to 200
7, a detection signal 20 indicating to which optical waveguide the light was transmitted.
70 to the control circuit 2090. Control circuit 2090
Is a variable wavelength selection element 201 according to the detection signal 2070.
2 to 2019 are generated. The variable wavelength selection elements 2012 and 2013 select an optical signal of a predetermined wavelength from the optical signals input respectively according to the control signals 2080 and 2081 from the control circuit 2090, and send them to the 1 × 2 optical space switches 2028 and 2029. Send out. Further, the variable wavelength selection elements 2014 and 2015 select optical signals of a predetermined wavelength from the optical signals respectively input according to the control signals 2082 and 2083 from the control circuit 2090, and select the 1 × 2 optical space switches 2030 and 2031. Send to Further, the variable wavelength selection elements 2016 and 2017 select optical signals of a predetermined wavelength from the optical signals input respectively according to the control signals 2084 and 2085 from the control circuit 2090, and 1 × 2 optical space switches 2032 and 2033.
Send to Also, the variable wavelength selection elements 2018 and 2019
Are control signals 2086 and 2087 from the control circuit 2090
, An optical signal of a predetermined wavelength is selected from the optical signals input thereto, and the 1 × 2 optical space switches 2034 and 203 are selected.
Send to 5.

1 × 2 optical space switches 2028 to 2035
Converts the optical signal into the optical buffer memory 20 for the high-priority optical cell in accordance with the header bit indicating the priority of the input optical signal.
36, 2038, 2040, 2042, 2044, 20
46, 2048, 2050 or optical buffer memories 2037, 2039, 2041, 204 for low priority optical cells.
Self-routing to any of 3,2045,2047,2049,2051. Optical buffer memory 203
6,2038 or 2037,2039 or 20
40, 2042 or 2041, 2043 store the input optical signals, and respectively store the optical signals stored in the first-in / first-out operation into mergers 2052 to 2055.
Send to Optical buffer memories 2044, 2046
Or 2045, 2047 or 2048, 205
0 or 2049, 2051 stores the input optical signal, and sends out the optical signal stored by the first-in / first-out operation to the mergers 2056 to 2059, respectively.
Incidentally, the 2 × 4 optical self-routing circuit 20 in FIG.
03, the variable wavelength selection elements 2012 to 2019 have the same configuration as the 2 × 4 optical self-routing circuit 703 and the variable wavelength selection elements 712 to 719 in FIG. Further, FIG.
1 × 2 optical space switches 2028 to 2035 and 1 × 2 optical space switches 2060 to 2063 have the configurations shown in FIGS. 17 and 21, respectively. Note that FIG.
Since the optical space switch has the same configuration as that of the above-described switch, only the corresponding reference numeral is entered in the figure, and the description is omitted.

As described above, also in the case of FIG. 20, the number of time slots required for the self-routing header section is reduced, and the priority control header section having a time slot equal to the number of priorities in the optical cell signal. , Priority control of outputting optical signals from output terminals in an order corresponding to the header portion for priority control can also be performed.

FIG. 24 is a block diagram of a tenth embodiment of the present invention, and shows an optical self-routing circuit in the case of a two-input terminal and a two-output terminal (2 × 2) for performing an optical broadcast control system. . The optical cell signal generation circuits 2420 and 2421 generate an optical cell signal including a header portion and a data portion corresponding to a plurality of predetermined output terminals from the input data portion and the broadcast control signal. The optical cell signal input from the optical cell signal generation circuit 2420 to the optical waveguide 2400 is
The optical cell signal from the optical signal generation circuit 2421 which is split into two optical signals at the optical waveguide 2401 and the optical gates 2404 and 2405 is input to the optical waveguide 2401 by the optical splitter 2403.
The light is branched and incident on the optical gates 2400 and 2407.
Output optical signals from the optical gates 2404 and 2406 are combined by the optical combiner 2408 and output from the optical waveguide 2410.
The optical signals output from the optical gates 2405 and 2407 are transmitted to the optical combiner 2
The light is merged at 409 and emitted from the optical waveguide 2411. The electric pulse generation circuit 2412 includes optical gates 2404 and 240
6, the same electrical pulse is applied to the optical gates 2405 and 2407 via the resistor 2414, and another electrical pulse is applied to the optical gates 2405 and 2407.

FIG. 25 is a timing chart for explaining the operation of the optical broadcast control in FIG. Reference numeral 2500 indicates a voltage pulse applied to the resistor 2413, next V _H0 between times t ₁ ~t _3, keep the V _L0 when t ₃ ~t _8. 2501 indicates a voltage pulse applied to the optical gates 2404,2406, time t ₁ ~t ₃ by resistor 2413
Between V _H0 is smaller than VH of , Keeping the V _L0 smaller V _L between t ₃ ~t _8. 2502 indicates a voltage pulse applied to the resistor 2414, next V _H0 between times t ₃ ~t _5, t ₅ ~t
_Maintain V _L0 for _eight . 2503 is an optical gate 2405, 24
Shows the voltage pulse applied to the 07, while V _H0 is less than V _H at time t ₃ ~t ₅ by resistor 2414, keeping the V _L0 smaller V _L between t ₅ ~t _8.

As an example of the optical broadcast control, the optical cell signal A from the optical cell signal generation circuit 2420 of the optical self-routing circuit shown in FIG. The operation in this case will be described. Optical gates 2404 and 2405 in FIG.
Optical cell signals A incident to, as shown in 2504 of FIG. 25, the time t ₁ ~t header optical signals between ₂ and time t ₃ ~t ₄ is present, the data at the time t ₆ ~t ₇ There is a partial light signal. Therefore, in each of the optical gates 2404 and 2405, the time of the electric pulse V _H coincides with the time of the presence of the header part optical signal. Therefore, the data portion of the optical cell signal A passes through both the optical gates 2404 and 2405 and passes through the optical couplers 2408 and 2409 to the optical waveguides 2410 and 2410.
11 is self-routed.

[0094] Thus, in the optical self-routing circuit of Figure 24, by placing the header portion of the optical cell signals in both the time t ₁ ~t ₃ and t ₃ ~t _5, the optical waveguide 2410 of FIG. 24 and 2411 Broadcast control for self-routing to both of them.

As another example of the optical broadcast control, the optical waveguides 2410 and 241 of the optical self-routing circuit shown in FIG.
1 to be broadcast-connected to both the optical cell signal generation circuits 242
0, 2421 from the optical waveguide 24
The case where the light beams are simultaneously input from 00 and 2401 will be described. The optical cell signal B incident on the optical gates 2404 and 2405 is, as shown at 2505 in FIG.
₁ ~t header both of the ₂ and t ₃ ~t ₄ exists data unit to t ₆ ~t _7. Therefore, both optical cell signals B and C may collide with each other at the signal to be broadcasted to both optical waveguides 2410 and 2411, and optical gate 240
4,2406 The header section is present within the time each of the voltage applied to the optical gates 2405 2407 is a V _H. However, since the header portion of the optical cell signal B is first incident on the optical gates 2404 and 2405, the optical gate 240
No. 4,2405 quickly switches to a state in which the subsequent data section is passed. When the optical gates 2404 and 2405 shift to this state, the injection current to the optical gates 2404 and 2405 increases, and the voltage applied to the optical gates 2406 and 2407 decreases due to the voltage drop due to the current flowing through the resistors 2413 and 2414. Therefore, the optical gate 2406,2
407 cannot pass the data part of the optical cell signal C. As a result, only the data portion of the optical cell signal B passes through the optical gates 2404 and 2405, and the optical multiplexer 2
Self-routing is performed to both optical waveguides 2410 and 2411 via 408 and 2409.

[0096] In FIG. 24 Thus, not only performs the broadcast connection by placing the header portion of the optical cell signals in both the time t ₁ ~t ₃ and t ₃ ~t _5, within these time ranges It is also possible to perform a broadcast control for preferentially self-routing an optical signal to the optical waveguides 2410 and 2411 in accordance with the arrival order of the header section in the above.

FIG. 26 is a block diagram of an embodiment of the eleventh invention of the present invention, and exemplifies a case of a two-input terminal and a two-output terminal (2 × 2) for performing an optical broadcast control system. The optical cell signals A, B, and C enter the optical copy circuit 2602 from the optical waveguides 2600, 2601, respectively. Optical copy circuit 2602
Copies the number of optical cell signals corresponding to the header portion of the incident optical cell signal, and outputs an optical signal from one or both of the optical waveguides 2603 and 2604. The optical signal from the optical copy circuit 2602 is
The data is sent to the header insertion circuits 2605 and 2606 via 604, respectively. The header insertion circuits 605 and 2606 add necessary headers to the input optical signal in the optical self-routing circuit 2609, and then add the optical waveguides 2607 and 26, respectively.
08 to the optical self-routing circuit 2609. The optical self-routing circuit 2609 converts an optical signal into an optical waveguide 261 according to a header portion of an incident optical cell signal.
0, 2611.

FIG. 27 shows an optical copy circuit 2602 in FIG.
FIG. Optical waveguide 260 in FIG.
Reference numerals 0, 2601, 603, and 2604 correspond to the optical waveguides having the same reference numerals shown in FIG. The optical buffer memories 2700 and 2701 each include an optical waveguide 260
From the broadcast control signal inputted from a data line inputted from 0,2601 and a separate line, the number of output terminals to be broadcast, that is, a header portion having the same number of header signals as the number of copies of the optical signal, and a data portion, , And after storing the optical cell signal, the optical splitter 2 is switched through the optical waveguides 2702 and 2703 by the first-in / first-out operation.
704 and 2705. The optical cell signal split into two by the optical splitter 2704 is input to the optical gates 2706 and 2707, and the optical cell signal split into two by the optical splitter 2705 is input to the gates 2708 and 2709. Light gate 27
The output optical signals 06 and 2708 are combined by the optical combiner 2710 and output from the optical waveguide 2603. Optical gate 270
The output optical signals of 7, 2709 are combined by an optical combiner 2711 and output from an optical waveguide 2704. The electric pulse generation circuit 2712 includes a resistor 271 connected to the optical gates 2706 and 2708.
3 and the same electrical pulse
7, 2709 is supplied with another electric pulse via a resistor 2714.

FIG. 28 is a timing chart for explaining the operation of the optical copy circuit of FIG. Reference 28
00 indicates a voltage pulse applied to the resistor 2713 at time t
Next V _H0 between ₁ ~t _3, keep the V _L0 when t ₃ ~t _8.
2801 indicates a voltage pulse applied to the optical gates 2706,2708, between V _H0 is less than V _H at time t ₁ ~t ₃ by resistor 2713, t ₃ V _L0 is smaller than V between ~t ₈
Keep _L. 2802 indicates a voltage pulse applied to the resistor 2714, next V _H0 between times t ₃ ~t _5, between V _L0 of t ₅ ~t ₈ kept. 2803 denotes optical gates 2707 and 2709
Shows the voltage pulse applied to, between V _H0 is less than V _H at time t ₃ ~t ₅ by resistor 2714, between t ₅ ~t ₈ V
Keep V _L less than _L0 .

As an example of the operation of the optical copy circuit 2602, two data portions of the optical cell signal A from the optical buffer memory 2700 in FIG.
The case where light is emitted from the 604 will be described. Optical cell signal A emitted from the optical buffer memory 2700 to the optical gates 2706,2707, as shown in 2804 of FIG. 28, a header section optical signal between times t ₁ ~t ₂ and time t ₃ ~t ₄ is present Then, an optical signal of the data part exists between times t ₆ and t ₇ . Therefore, in the optical gates 2706 and 2707, the time of the electric pulse V _H and the time of the presence of the header portion optical signal coincide with each other. Therefore, the data portion of the optical cell signal A passes through both the optical gates 2706 and 2707 and passes through the optical couplers 2710 and 2711 to the optical waveguides 2603 and 2604.
Output from Thus is possible to copy the optical signal up to two by placing one or both of the time t ₁ ~t ₃ and t ₃ ~t ₅ a header portion of the optical cell signals in optical copy circuit of Figure 27 It is possible.

As another operation example of the optical copy circuit, a case where optical cell signals B and C are sent from the optical buffer memories 2700 and 2701 to the optical waveguides 2702 and 2703, respectively, will be described. Optical gate 2706
Photocell signal B is incident to 2707, as shown in 2805, the header portion to both a time t ₁ ~t ₂ and t ₃ ~t ₄ is, data portion is present in the t ₆ ~t _7. Optical gate 270
Optical cell signals C incident to 8,2709, as shown in 2806, the header portion to both a time t ₂ ~t ₃ and t ₄ ~t ₅ is, data portion is present in the t ₆ ~t _7. Accordingly, the applied voltages of the optical gates 2706 and 2708 and the optical gates 2707 and 2709 are both V _{H in the} optical cell signals B and C.
Since the header portion exists within the time of, the cell signal is desired to be copied two by two for each data portion. Therefore, the total number of copies becomes four, which is possible with the optical copy circuit of FIG. The maximum number of copies exceeds 2. Therefore, the copy of the data portion of the optical cell signals B and C is performed by the optical waveguide 260.
3,2604 may collide with each other. However, the header portion of the optical cell signal B first has the optical gates 2706, 2706
707, the optical gates 2706, 2707
Is quickly switched to a state of passing the subsequent data section.
When the optical gates 2706 and 2707 shift to this state,
The current injected into the optical gates 2706 and 2707 increases, and the voltage applied to the optical gates 2708 and 2709 decreases due to the voltage drop due to the passage of the current through the resistors 413 and 414. C data cannot be passed. As a result, only the data part of the optical cell signal B is changed to the optical gates 2706, 2
707 is self-routed to both the optical waveguides 2603 and 2604 via the optical couplers 2710 and 2711, respectively.

[0102] In FIG. 27 Thus, by placing one or both either the header portion of the optical cell signals time t ₁ ~t ₃ and t ₃ ~t _5, of up to two optical cell signals In addition to copying the data portion, if the requested number of copies exceeds the maximum number of copies of 2, the time t ₁
It is also possible to perform the copying of the data portion of the optical cell signals header arrives earlier among ~t ₃ and t ₃ ~t ₅ preferentially.

The optical signal copied by a predetermined number in the optical copy circuit 2602 in FIG.
5 and 2606, a header indicating a predetermined output terminal to be transmitted is added, and an optical self-routing circuit 2609 is added.
Sent to As a specific configuration of the optical self-routing circuit 2609, the one-to-one shown in FIG.
The same configuration as the conventional optical self-routing circuit that can be connected is applicable.

As described above, by cascading an optical copy circuit in front of an optical self-routing circuit capable of one-to-one connection, it is possible to perform optical broadcast control according to the header of an optical cell signal. .

In the optical broadcast control system of FIG. 24 in which the copy operation and the self-routing operation are performed simultaneously, the optical cell signal (broadcast) desired to be broadcast only when the connection to a plurality of predetermined output terminals is simultaneously free. The optical cell signal is sent to the optical self-routing circuit. On the other hand, in the optical broadcast control system shown in FIG. 26, an optical copy circuit copies optical signals of the same number as the number of headers of optical cell signals, and thereafter, the individual optical signals copied are optically self-routed. Since the circuit self-routes to a predetermined output terminal on a one-to-one basis, a broadcast optical cell signal can be sent to the optical self-routing circuit even when connections to a plurality of predetermined output terminals are not simultaneously available.

[0106]

As described above, according to the present invention, an optical signal can be transmitted to a predetermined output terminal corresponding to the header of an optical cell signal, and the number of time slots in the header required for self-routing can be increased. Therefore, the throughput of the effective data portion transfer is improved.

Further, according to the present invention, since a plurality of optical self-routing circuits are used, the effective throughput can be increased.

Further, according to the present invention, even when priorities are assigned to the optical cell signals, the optical signals can be output in order according to the priority.

Further, according to the present invention, in the optical self-routing circuit, the broadcast control of the optical signal can be performed by placing the header portion of the cell signal in a time slot corresponding to a plurality of predetermined output terminals. Also, an optical copy circuit for copying an optical signal having a copy number equal to the number of optical cell signal headers, and a light for self-routing to a predetermined output terminal on a one-to-one basis according to the header part of the optical cell signal. Optical broadcast control that cascade-connects with a self-routing circuit is possible.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of the first invention of the present invention.

FIG. 2 is a configuration diagram of a 2 × 4 optical self-routing circuit in FIG. 1;

FIG. 3 is a timing chart showing the operation of the 2 × 4 optical self-routing circuit of FIG. 2;

FIG. 4 is a configuration diagram of a second embodiment of the present invention.

FIG. 5 is a configuration diagram of a 2 × 2 optical self-routing circuit in FIG. 4;

FIG. 6 is a timing chart showing the operation of the 2 × 2 optical self-routing circuit of FIG. 5;

FIG. 7 is a configuration diagram of a third embodiment of the present invention.

FIG. 8 is a configuration diagram of a 2 × 4 optical self-routing circuit of FIG. 7;

FIG. 9 is a timing chart showing the operation of the 2 × 4 optical self-routing circuit of FIG. 8;

FIG. 10 is a configuration diagram of a fourth embodiment of the present invention.

FIG. 11 is a timing chart showing the operation of the distribution circuit, 2 × 4 optical self-routing circuit, and combination circuit in FIG. 10;

FIG. 12 is a configuration diagram of a fifth embodiment of the present invention.

13 is a timing chart showing the operation of the distribution circuit, the 2 × 2 optical self-routing circuit, and the combining circuit in FIG.

FIG. 14 is a configuration diagram of a sixth embodiment of the present invention.

FIG. 15 is a timing chart showing the operation of the distribution circuit, the 2 × 4 optical self-routing circuit, and the combining circuit in FIG. 14;

FIG. 16 is a configuration diagram of a seventh embodiment of the present invention.

FIG. 17 is a configuration diagram of a 1 × 2 optical space switch in FIG. 16;

FIG. 18 is a timing chart showing the operation of the 1 × 2 optical space switch of FIG. 17;

FIG. 19 is a configuration diagram of an embodiment of the eighth invention of the present invention.

FIG. 20 is a configuration diagram of a ninth embodiment of the present invention.

FIG. 21 is a configuration diagram of a 2 × 1 optical space switch in FIGS. 16, 19, and 20;

FIG. 22 is a timing chart showing the operation of the 2 × 1 optical space switch of FIG. 21;

FIG. 23 is a timing chart showing the operation of the 2 × 1 optical space switch of FIG. 21;

FIG. 24 is a configuration diagram of a tenth embodiment of the present invention.

FIG. 25 is a timing chart showing the operation of the optical self-routing circuit of FIG. 24;

FIG. 26 is a block diagram of an eleventh embodiment of the present invention.

FIG. 27 is a configuration diagram of a 2 × 2 optical copy circuit in FIG. 26;

FIG. 28 is a timing chart showing the operation of the 2 × 2 optical copy circuit of FIG. 27;

FIG. 29 is a configuration diagram of a conventional optical ATM switch.

FIG. 30 is a configuration diagram of a 2 × 2 optical self-routing circuit in FIG. 29;

FIG. 31 is a structural diagram of an optical gate used in the 2 × 2 optical self-routing circuit of FIG. 30;

FIG. 32 is a timing chart showing the operation of the 2 × 2 optical self-routing circuit of FIG. 30.

[Explanation of symbols]

101, 102, 104 to 107, 110 to 113, 1
20, 121 Optical waveguide 103 2 × 4 optical self-routing circuit 108, 109 2 × 2 optical space switch 114-117 Optical buffer memory 118, 119 Combiner 130 Detection signal 131, 132 Control signal 203, 204 Optical splitter 205-208 Optical gate 213 Electric pulse generation circuit 220-223 Resistance 230-233 Detector 401,402,404,405,412-415,4
22,423 Optical waveguide 403 2 × 2 optical self-routing circuit 406,407 Divider 408-411 Variable wavelength selector 416-419 Optical buffer memory 420,421 Junction 430 Detection signal 431-434 Control signal 440 Control circuit 503,504 Optical splitters 505-508 Optical gates 509,510 Junction 513 Electric pulse generation circuit 520,523 Resistance 530-533 Detector 540-543 Detection signal 701,702,704-707,726-727,7
40 to 743 Optical waveguide 703 2 × 2 optical self-routing circuit 708 to 711 Divider 712 to 719 Variable wavelength selection element 728 to 735 Optical buffer memory 736 to 739 Merging device 750 Detection signal 751 to 758 Control signal 760 Control circuit 803, 804 Optical branching device 805-812 Optical gate 813-816 Merging device 823 Electric pulse generation circuit 830-837 Resistance 840-847 Detector 850-857 Detection signal 1001,1002,1005-1008,1011
1018, 1023 to 1026, 1029 to 1032,
1039, 1040 Optical waveguide 1003, 1004 Distributing circuit 1009, 1010 2 × 4 optical self-routing circuit 1019 to 1022 Combining circuit 1027, 1028 2 × 2 optical spatial switch 1033 to 1036 Optical buffer memory 1037, 1038 Combiner 1050, 1051 Detection signal 1060, 1061 control signal 1070 control circuit 1201, 1202, 1205-1208, 1211-
1214,1223-1226,1233,1234
Optical waveguides 1203, 1204 Distributing circuit 1209, 1210 2x2 optical self-routing circuit 1215 to 1216 Combining circuit 1217, 1218 Branching device 1219 to 1222 Variable wavelength selecting element 1227-1230 Optical buffer memory 1231, 1232 Merging device 1240, 1241 Detection signal 1250-1253 Control signal 1260 Control circuit 1401,1402,1405-1408,1411-
1418, 1535 to 1442, 1455 to 1458
Optical waveguides 1403, 1404 Distributing circuits 1409, 1410 2x2 optical self-routing circuits 1419 to 1422 Synthesizing circuits 1423 to 1426 Branching devices 1427 to 1434 Variable wavelength selecting elements 1443 to 1450 Optical buffer memories 1451 to 1454 Merging devices 1460, 1461 1470 to 1477 control signal 1480 control circuit 1601, 1602, 1604 to 1607, 1610
1613, 1632, 1633 Optical waveguide 1603 2 × 4 optical self-routing circuit 1608, 1609 2 × 2 optical spatial switch 1614-1617 1 × 2 optical spatial switch 1618-1625 Optical buffer memory 1630, 1631 Combiner 1640 Detection signal 1650, 1651 Control signal 1670 Control circuit 1701, 1702, 1705, 1706 Optical waveguide 1702 Optical splitter 1703, 1704 Optical gate 1707 Electric pulse generation circuit 1901, 1902, 1904, 1905, 1912 ~
1915, 1934, 1935 Optical waveguide 1903 2 × 2 optical self-routing circuit 1906, 1907 Splitter 1908-1911 Variable wavelength selection element 1916-1919 1 × 2 optical space switch 1920-1927 Optical buffer memory 1928-1931 Junction 1932, 1933 Optical space switch 1940 Detection signal 1950-1953 Control signal 1970 Control circuit 2001, 2002, 2004-2007, 2020
2027, 2064 to 2067 Optical waveguide 2003 2 × 2 optical self-routing circuit 2008 to 2011 Splitter 2012 to 2019 Variable wavelength selection element 2028 to 2035 1 × 2 optical space switch 2036 to 2051 Optical buffer memory 2052 to 2059 Junction device 2060 to 2063 Optical space switch 2070 Detection signal 2080-2087 Control signal 2090 Control circuit 2100, 2101, 2102 Optical waveguide 2110, 2111 Optical gate 2120 Junction 2130 Resistance 2400, 2401, 410, 2411 Optical waveguide 2402, 2403 Optical splitter 2404-2407 Light Gate 2408, 2409 Combiner 2412 Electric pulse generation circuit 2413, 2414 Resistance 2420, 2421 Optical cell signal generation circuit 2600, 2601, 260 , 2604,2607,
2608, 2610, 2611 Optical waveguide 2602 Optical copy circuit 2605, 2606 Header insertion circuit 2609 Optical self-routing circuit 2700, 2701 Optical buffer memory 2702, 2703 Optical waveguide 2704, 2705 Optical splitter 2706-2709 Optical gate 2710, 2711 Combiner 2712 Electric pulse generation circuit 2713, 2714 Resistance 2901, 2902, 2905, 2906, 2908,
2909 Optical waveguide 2903, 2904 Optical buffer memory 2907 Optical self-routing circuit 3003, 3004 Optical splitter 3005 to 3008 Optical gate 3009, 3010 Optical coupler 3013 Electric pulse generation circuit 3020, 3021 Resistance 3100 Input optical signal 3110 Optical guide layer 3120, 3130 End face 3140 Electrode 3150 Output optical signal

Claims (10)

(57) [Claims] 1. An optical AT having n (n is an integer of 2 or more) input ports and m (m is an integer of 2 or more) output ports.
In the M switch, n input terminals (1) connected to the n input ports
01 to 102) and n × m output terminals (104 to
7), and the nxm output terminals are composed of m output terminal groups (104 to 105 or 106 to 107) prepared by n for each of the m output ports. Then, the optical signal input to the input terminal is self-routed to a predetermined output terminal according to header information, and a detection signal (130) indicating which output terminal the optical signal is self-routed to is output. an optical self-routing circuit (103) having n inputs and n × m outputs; a control circuit (140) for outputting a control signal in response to the detection signal from the optical self-routing circuit; The optical signal connected to the n output terminals of each output terminal group and input according to the control signals (131, 132) from the control circuit is represented by n
Output terminals (110, 111 or 112, 11
3) optical space switches (108 to 109) having n inputs and n outputs that are switched to any one of the above three cases; and n optical switches provided in accordance with the m output terminal groups of the optical self-routing circuit. N × m optical buffer memories (114) connected to n output terminals of each of the optical space switches and storing and outputting the optical signals from the optical space switches in a first-in / first-out operation.
To 117), and m n multiplexers (118 to 1) that combine and output the optical signals from the optical buffer memories provided n by n according to the m output terminal groups of the optical self-routing circuit.
(19) An optical ATM switch comprising: 2. An optical AT having n (n is an integer of 2 or more) input ports and m (m is an integer of 2 or more) output ports.
In the M switch, n input terminals (4
01 to 402) and m output terminals (404 to 405)
And the wavelength of the optical signal incident from each of the n input terminals is fixed to each of the n different wavelengths, and the optical signal input to the input terminal is a header. Self-routing to a predetermined output terminal according to information and multiplexing an optical signal self-routed to the same output terminal to output a wavelength division multiplexed optical signal, and to which output terminal the wavelength division multiplexed optical signal An n-input, m-output optical self-routing circuit (403) for outputting a detection signal (430) indicating whether or not the signal has been routed; and outputting control signals (431 to 434) according to the detection signal from the optical self-routing circuit. A control circuit (440), and m n-branches (406) connected to each of the m output terminals of the optical self-routing circuit and branching the wavelength multiplexed optical signal. 407), n output terminals are provided corresponding to each of the m output terminals of the optical self-routing circuit, and n output terminals are connected to each of the m n splitters, according to a control signal from the control circuit. N which selects an optical signal of a predetermined wavelength from the wavelength-multiplexed optical signal inputted to the output terminal (412-415).
× m variable wavelength selection elements (408 to 411), and n n corresponding to each of the m output terminals of the optical self-routing circuit, connected to each of n × m variable wavelength selection elements The n × m optical buffer memories (416 to 4) for storing and outputting the selected optical signal of the predetermined wavelength by the first-in / first-out operation.
19), and m n multiplexers (420 to 420) that combine and output the optical signals from the n optical buffer memories provided corresponding to the respective m output terminals of the optical self-routing circuit.
421), wherein the optical ATM switch comprises: 3. An optical AT having n (n is an integer of 2 or more) input ports and m (m is an integer of 2 or more) output ports.
In the M switch, each of the g wavelength groups is composed of n optical signals having different wavelengths (λ11 and λ12 or λ21 and λ2
2), n input terminals connected to the n input ports (7
01 to 702) and m output terminals (704 to 707)
Optical signals belonging to each of the g wavelength groups are input one by one from each of the n input terminals, and the input optical signals are predetermined according to header information and the wavelength of the optical signals. Output the wavelength-multiplexed optical signals by multiplexing for each of the g wavelength groups, and indicating to which of the output terminals the wavelength-multiplexed optical signals belonging to each of the wavelength groups were self-routed. An n-input, m-output optical self-routing circuit (703) for outputting a detection signal (750); and a control circuit (760) for outputting control signals (751-758) in response to the detection signal from the optical self-routing circuit. And m n-branch units (708 to 711) respectively connected to m output terminals of the optical self-routing circuit and branching the wavelength multiplexed optical signal. N output terminals are provided corresponding to each of the m output terminals of the optical self-routing circuit, and n output terminals are connected to each of the m n branch devices, and the wavelength is set in response to a control signal from the control circuit. N × m variable wavelength selection elements (7) for selecting an optical signal of a predetermined wavelength from the multiplexed optical signal and outputting the selected signal to an output terminal
12 to 719), and n output terminals are provided corresponding to the m output terminals of the optical self-routing circuit, respectively, connected to the n × m variable wavelength selection elements, and the selected predetermined wavelength is selected. N × m optical buffer memories (728 to 7) for storing and outputting the optical signals of
35); and m n multiplexers (736 to 736 to merge and output the optical signals from the n optical buffer memories provided corresponding to the respective m output terminals of the optical self-routing circuit.
739). An optical ATM switch comprising: 4. An optical AT having n (n is an integer of 2 or more) input ports and m (m is an integer of 2 or more) output ports.
In the M switch, an input terminal connected to the input port (1001 to 10
02) and k (k is an integer of 2 or more) output terminals (10
05 and 1007 or 1006 and 1008),
N distributing circuits (1003 to 1004) for sequentially outputting input optical signals to the k output terminals; and k input terminals for each of the n distributing circuits, each having one input terminal. N × m output terminals (1011
-1018) is n for each of the m output ports.
M output terminal groups (1011 and 101
3 or 1015 and 1017 or 1012 and 10
14 or 1016 and 1018), the optical signal input to the input terminal is self-routed to a predetermined output terminal according to header information, and indicates to which output terminal the optical signal is self-routed. K that outputs a detection signal (1050 or 1051)
N-input n × m-output optical self-routing circuits (1
009 to 1010), and one of the n × m output terminals of each of the k optical self-routing circuits is connected to each of the k input terminals, and is input from the optical self-routing circuit. N × m combining circuits (1021 to 1024) for sequentially outputting the optical signals to an output terminal, and a control circuit for outputting control signals (1060, 1061) according to the detection signal from the optical self-routing circuit (1070), connected to n output terminals of each output terminal group forming an output terminal of the optical self-routing circuit, and outputting n optical signals input according to a control signal from the control circuit to n output terminals. Terminals (1029 to 1030 or 1031 to 103
2) m n-input n-output optical space switches to be switched to any one of 2), and n k-optical self-routing circuits each provided with n output terminals corresponding to the m output terminal groups. N × m optical buffer memories (1033 to 1036) which are connected to n output terminals of each of the optical space switches and store and output the optical signal from the optical space switch by a first-in / first-out operation; M n-multiplexers (1037 to 1037 to combine and output the optical signals from the optical buffer memories provided n by n corresponding to the m output terminal groups of each of the k optical self-routing circuits. 1038), wherein the optical ATM switch comprises: 5. An optical AT having n (n is an integer of 2 or more) input ports and m (m is an integer of 2 or more) output ports.
In the M switch, an input terminal (1201 to 12) connected to the input port
02) and k (k is an integer of 2 or more) output terminals (12
05 and 1207 or 1206 and 1208)
Each of the n different wavelengths of the optical signal incident from the input terminal is fixedly determined, and the n sorting circuits sequentially output the input optical signal to the k output terminals. (1203 to 1204), one input terminal is connected to each of the k output terminals of each of the n distribution circuits, and m output terminals (1211 to 1
214), the optical signal input to the input terminal is self-routed to a predetermined output terminal according to header information, and the optical signal self-routed to the same output terminal is multiplexed to multiplex wavelength-multiplexed light. K n-input m-output optical self-routing circuits (1209, 1210) for outputting a signal and outputting detection signals (1240, 1241) indicating to which of the output terminals the wavelength-multiplexed optical signal is self-routed; The m output terminals of each of the k optical self-routing circuits are connected one by one to each of the k input terminals, and the input wavelength-multiplexed optical signals from the optical self-routing circuit are sequentially output to the output terminals. M synthesis circuits (121
5-1216); a control circuit (1260) for outputting a control signal (1250-1253) in response to the detection signal from the optical self-routing circuit; M n-branch units (1217 to 121) for branching a multiplexed optical signal
8) and n output terminals are provided corresponding to the m output terminals of the optical self-routing circuit, and n output terminals are connected to each of the m n splitters, according to a control signal from the control circuit. N × m variable wavelength selection elements (1219 to 1222) for selecting an optical signal of a predetermined wavelength from the wavelength multiplexed optical signal inputted and outputting the selected signal to an output terminal (1223-1226)
N output terminals are provided corresponding to the m output terminals of the optical self-routing circuit, respectively, connected to each of the n × m variable wavelength selection elements, and the selected predetermined wavelength optical signal is transmitted. N × m optical buffer memories (1227 to 1227) which store and output by the first-in / first-out operation
1230) and m n-multiplexers (1231) for combining and outputting the optical signals from the n optical buffer memories provided corresponding to the m output terminals of the optical self-routing circuit, respectively.
Optical ATM characterized by comprising:
switch. 6. An optical AT having n (n is an integer of 2 or more) input ports and m (m is an integer of 2 or more) output ports.
In the M switch, each of the g wavelength groups is composed of n optical signals having different wavelengths (λ11 and λ12 or λ21 and λ2
2) an input terminal (14) connected to each of the n input ports;
01 to 1402) and k (k is an integer of 2 or more) output terminals (1405 and 1407 or 1406 and 140)
8) wherein n optical signals belonging to each of the g wavelength groups are input one by one from the input terminal, and the input optical signals are sequentially output to the k output terminals. One input terminal is connected to each of the distribution circuits (1403 to 1404) and k output terminals of each of the n distribution circuits, and m output terminals (1411, 1
413, 1415, 1417 or 1412, 141
4, 1416, 1418), and one optical signal belonging to each of the g wavelength groups is input from the input terminal one by one, and the input optical signal is determined according to header information and the wavelength of the optical signal. Self-routing to the predetermined output terminal and multiplexing for each of the g wavelength groups to output a wavelength multiplexed optical signal, and to which output terminal the wavelength multiplexed optical signal belonging to each of the wavelength groups is self-routed. K n-input m-output optical self-routing circuits (1409, 1410) that output detection signals (1460, 1461) indicating m, and k output terminals of each of the k optical self-routing circuits are one by one. m combining units connected to k input terminals and sequentially outputting the input wavelength-multiplexed optical signals from the optical self-routing circuit to the output terminals. Circuit (141
9-1422), a control circuit (1480) that outputs a control signal (1470-1477) according to the detection signal from the optical self-routing circuit, and an output terminal of the m combining circuits, M n-branch devices (1423 to 142) for branching a wavelength multiplexed optical signal
6) and n output terminals are provided corresponding to each of the m output terminals of the optical self-routing circuit, and n output terminals are connected to each of the m n branch devices, and in response to a control signal from the control circuit. Nxm variable wavelength selection elements (1
427 to 1434), and n output terminals are provided corresponding to the m output terminals of the optical self-routing circuit, respectively, connected to the n × m variable wavelength selection elements, and the selected predetermined wavelength is selected. N × m optical buffer memories (1443 to 1443) for storing and outputting the optical signals of
1450) and m n-multiplexers (1451) for combining and outputting the optical signals from the n optical buffer memories provided corresponding to each of the m output terminals of the optical self-routing circuit.
To 1454).
switch. 7. An optical AT having n (n is an integer of 2 or more) input ports and m (m is an integer of 2 or more) output ports.
In the M switch, n input terminals (1) connected to the n input ports
601 to 1602) and n × m output terminals (1604)
To 1607), and the n × m output terminals are provided for each of the m output ports.
Output terminal groups (1604 to 1605 or 1606)
To 1607), the optical signal input to the input terminal is self-routed to the predetermined output terminal according to the first header information, and indicates to which output terminal the optical signal is self-routed. Detection signal (1
An optical self-routing circuit (1603) having n inputs and n × m outputs for outputting 640), and a control circuit (1670) for outputting control signals (1650, 1651) in response to the detection signal from the optical self-routing circuit. M constituting an output terminal of the optical self-routing circuit
Optical terminals connected to the n output terminals of each of the n output terminal groups and input in response to a control signal from the control circuit.
Output terminals (1610, 1611 or 1612,
1613) are connected to one of the m optical spatial switches (1608 to 1609) having n inputs and n outputs, each of which is connected to one of the output terminals of the m optical spatial switches. (P is an integer of 2 or more) output terminals equal to the number of priorities, and the optical signal from the optical space switch is self-routed to the predetermined output terminal according to the second header information. nx
m 1-input p-output optical space switches (1614 to 1614)
17), the optical signals connected to the p output terminals of each of the n × m optical space switches and corresponding to the priorities from the optical space switches are stored in a first-in / first-out operation. N × m optical buffer memory groups (1618 and 1619, consisting of p optical buffer memories to be output)
1620 and 1621, 1622 and 1623, 1624 and 1625) and m output terminal groups of the m optical space switches have p
P × m n multiplexers (1626-1629) for combining and outputting the same priority optical signals from the optical buffer memory group, and m m optical spatial switches 1 for each output terminal group
, And p optical signals from n optical couplers are input to each of the m output terminal groups of the m optical space switches, and priority is given in accordance with the third header information. 1 in
An optical ATM switch, comprising: m optical spatial switches (1630, 1631) each of which outputs one signal and has p inputs and one output. 8. An optical AT having n (n is an integer of 2 or more) input ports and m (m is an integer of 2 or more) output ports.
In the M switch, n input terminals (1) connected to the n input ports
901 to 1902) and m output terminals (1901 to 1904)
905), and the wavelengths of the optical signals input from each of the n input terminals are fixedly determined at each of the n different wavelengths, and the optical signal input to the input terminal Is self-routed to the predetermined output terminal according to the first header information, and multiplexes the optical signal self-routed to the same output terminal to output a wavelength multiplexed optical signal. An n-input, m-output optical self-routing circuit (1) for outputting a detection signal (1940) indicating whether the output terminal is self-routed.
903), a control circuit (1970) that outputs control signals (1950 to 1953) in response to the detection signal from the optical self-routing circuit, and m output terminals of the optical self-routing circuit, M n-branch units (1906 to 1907) for branching the wavelength multiplexed optical signal, and n m-branch units provided for each of the m output terminals of the optical self-routing circuit; N × m are connected to each of them, and select an optical signal of a predetermined wavelength from the wavelength multiplexed optical signal input according to a control signal from the control circuit and output to an output terminal (1912-1915). Variable wavelength selection elements (1908 to 1911)
And n output terminals corresponding to each of the m output terminals of the optical self-routing circuit are connected to each of the n × m variable wavelength selection elements, and are provided in advance to the selected optical signal. P equal to the number of priorities (p is an integer of 2 or more)
N × m 1-input / p-output optical space switches (1916) having a number of output terminals and for self-routing an optical signal from the variable wavelength selection element to a predetermined output terminal according to second header information. To 1919), n optical terminals are provided corresponding to each of the m output terminals of the optical self-routing circuit, and optical signals corresponding to the priorities from the n × m optical spatial switches are first-in. / N × m optical buffer memory groups (1920 to 1921, 1922 to 1923, 19) composed of p optical buffer memories to be stored and output by the first out operation
24 to 1925, 1926 to 1927), and p p-numbers are provided corresponding to the m output terminals of the optical self-routing circuit, respectively, and merge the same priority optical signals from the optical buffer memory group. P × to output
m number of n-combiners (1928 to 1931), one each corresponding to each of the m output terminals of the optical self-routing circuit, and each of the m output terminal groups of the m optical space switches M p-input / one-output optical space switches (p-input and one-output) that receive p optical signals from n-multiplexers provided one by one and output one signal preferentially according to the third header information 1932 to 1933). 9. An optical AT having n (n is an integer of 2 or more) input ports and m (m is an integer of 2 or more) output ports.
In the M switch, each of the g wavelength groups is composed of n optical signals having different wavelengths (λ11 and λ12 or λ21 and λ2
2), n input terminals connected to the n input ports (2
001-2002) and m output terminals (2004-2
007), and from each of the n input terminals, the g
Optical signals belonging to each of the wavelength groups are input one by one, the input optical signal is self-routed to the predetermined output terminal according to header information and the wavelength of the optical signal, and the g wavelength groups are set. Multiplexed for each wavelength group, and outputs a wavelength multiplexed optical signal, and outputs a detection signal (2070) indicating to which output terminal the wavelength multiplexed optical signal belonging to each of the wavelength groups is self-routed. A routing circuit (2003); a control circuit (2090) for outputting a control signal (2080-2087) in response to the detection signal from the optical self-routing circuit; and m output terminals of the optical self-routing circuit. M n-branch units (2008 to 2011) that are connected and branch the wavelength multiplexed optical signal; and the optical self-routing. N output terminals are provided corresponding to each of the m output terminals of the path, and n output terminals are connected to each of the m n branch devices, and a predetermined number is determined from the wavelength multiplexed optical signal according to a control signal from the control circuit. N × m variable wavelength selection elements (2) for selecting an optical signal having a wavelength of
012 to 2019), and n output terminals are provided corresponding to the m output terminals of the optical self-routing circuit, respectively, and are connected to the n × m variable wavelength selection elements, respectively. P equal to the number of priorities assigned in advance (p is an integer of 2 or more)
N × m 1-input / p-output optical space switches (2028) having self-routed optical signals from the variable wavelength selection element to predetermined output terminals according to second header information. To 2035), and n output terminals are provided corresponding to the m output terminals of the optical self-routing circuit, respectively, and the optical signals corresponding to the priorities from the n × m optical space switches are first-in. / N × m optical buffer memory groups (2036 to 2037, consisting of p optical buffer memories for storing and outputting in the first out operation)
2038-2039, 2040-2041, 2042-
2043, 2044-2045, 2046-2047,
2048 to 2049, 2050 to 2051), and p-numbers corresponding to the m output terminals of the optical self-routing circuit are provided, and the same priority optical signals from the optical buffer memory group are merged. P × to output
m number of n couplers (2052 to 2059), one each corresponding to each of the m output terminals of the optical self-routing circuit, and m output terminal groups of the m optical space switches M p-input / one-output optical space switches (p-input and one-output) that receive p optical signals from n-multiplexers provided one by one and output one signal preferentially according to the third header information 2060 to 2063). 10. A light A having n (n is an integer of 2 or more) input ports and m (m is an integer of 2 or more) output ports.
In the TM switch, n input terminals (2
600-2601) and m output terminals (2603-26)
04), n optical buffer memories (2700 to 2701) for generating and storing optical cell signals from an input data part and a broadcast control signal and emitting the optical cell signals, and the n optical buffer memories The optical cell comprises optical gates (2706 to 2709) which transmit the data portion of the optical cell signal only when a header signal and an electric signal of the optical cell signal which are connected to and inputted to each of the optical cells are simultaneously applied. A first optical self-routing circuit that generates as many optical signals as the number of the first header signals included in the signal and self-routes them to m (m is an integer of 2 or more) first output terminals. An optical copy circuit (2602), and a second header signal connected to each of the m output terminals of the optical copy circuit for performing self-routing on an incident optical signal. And m header insertion circuits (2605 to 2606), which are connected to the m header insertion circuits, and are placed in m time slots provided for each of the m output ports. An optical self-routing circuit (2609) for self-routing the optical signal to the predetermined output port in response to the second header signal, wherein the optical copy circuit has a first header signal included in the optical cell signal. And the m header insertion circuits each add the second header signal to each of the data portions generated by the optical copy circuit, and the optical self-routing circuit Wherein said data portion self-routes to said predetermined output port in response to said second header signal.