JPH06164628A - Optical atm switch - Google Patents

Abstract

PURPOSE:To provide an optical ATM switch which can improve the transfer throughput of the data signals. CONSTITUTION:The optical cell signals of wavelength lambda1 and lambda2 are distributed to the (2X2) self-routing circuits 1209 and 1210 by the distributing circuits 1203 and 1204 and then sent to the synthesizing circuit 1215 and 1216 respectively after the self-routing. The output optical signals of both circuits 1215 and 1216 are sent to the variable wavelength elements 1219-1222 via the branching devices 1217 and 1218. The optical signals of the prescribed wavelength are selected by the elements 1219-1222 and written in the optical buffer memories 1227-1230 respectively. The optical signals stored in the memories 1227-1230 are successively transmitted from the optical waveguides 1233 and 1234 via the jointing devices 1231 and 1232.

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 switching according to the header portion of an optical cell signal.

[0002]

2. Description of the Related Art Optical communication using an optical fiber for a transmission line is
Since the optical fiber has a wide band, it is possible to transmit a large amount of information, and the optical fiber is advantageous in that it does not receive induced noise. Therefore, it is expected to be widely used in the future. The switch used in this optical communication is preferably an optical switch capable of switching optical signals in the optical range. Among them, an optical ATM switch that handles a cellized optical signal is regarded as promising because it 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 (Proc.
SE 91-82).

FIG. 29 is a block diagram of such a conventional optical ATM switch, and illustrates the case of two input terminals and output terminals (2 × 2). The optical cell signals A and B which are respectively incident from the optical waveguides 2901 and 2902 are transmitted to the optical buffer memory 2
903, 2904. Optical buffer memory 29
03 and 2904 store first-in / first-out (F
IFO) operation to transmit optical cell signals to optical waveguides 2905, 290
It is sent to the 2 × 2 optical self-routing circuit 2907 via 6. The 2 × 2 optical self-routing circuit 2907 transmits the optical cell signal to the optical waveguide 290 according to the header portion of the optical cell signal incident from the optical waveguides 2905 and 2906.
Self-routes to 8,2909.

FIG. 30 is a detailed block diagram of the 2 × 2 optical self-routing circuit 2907 in FIG. In FIG. 30, optical waveguides 2905, 2906, 2908, 290
9 corresponds to the optical waveguides of FIG. 29, respectively.
Optical cell signals A or C, B input to 905 and 2906
Alternatively, D is branched into two by the optical branching devices 3003 and 3004 and is incident on the optical gates 3005, 3006 and 3007, 3008. The optical signals output from the optical gates 3005 and 3007 are combined by the optical combiner 3009 and emitted from the optical waveguide 2908. The optical signals output from the optical gates 3006 and 3008 are combined by the optical combiner 3010 and emitted from the optical waveguide 2909. The electric pulse generation circuit 3013 is the optical gate 300.
5, 3007 is applied with the same electric pulse via the resistor 3020, and another electric pulse is applied with the optical gates 3006, 3008 via the resistor 3021.

FIG. 31 shows the optical gates 3005 to 3 in FIG.
It is a perspective view for explaining one structure of 008. Figure 31
In the optical gate of FIG.
The input optical signal 3100 is input to the output terminal 20, and the output optical signal 3150 is output from the other end surface 3130. Further, the control signal V is applied via the electrode 3140. When the input optical signal 3100 is input when V = V _H , this optical gate amplifies the input optical signal while the voltage V = V _L (V _L <V _H ) is applied thereafter. Output. For details of such optical gates, see the Japan Society of Applied Physics, Heisei 2
754 Proceedings of Autumn Meeting, Lecture No. 26p-H-
2 are described.

FIG. 32 is a timing chart for explaining the operation of FIG. Reference numeral 3201 is a resistor 30.
20 shows a voltage pulse applied to V, and V is applied between times t _{1 and} t ₃ .
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
Reference numeral 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.
Reference numeral 3204 indicates a voltage pulse applied to the optical gates 3006 and 3008, and V is applied between the times t _{3 and} t ₅ by the resistor 3021.
Keep V _H less than _{H0 and} V _L less than t _{5 to} t ₈ .
The optical cell signal A incident on the optical gates 3005 and 3006 of FIG. 30 is time t ₁ to t as shown by 3205 of FIG.
Header optical signal only between ₂ are present, the data unit optical signal at time t ₆ ~t ₇ is present. Therefore, the optical gate 300
5, the time of the electric pulse V _H and the time of the optical signal in the header portion are the same, but the optical gate 3006 is not the same. Therefore, the data portion of the optical cell signal A is the optical gate 3
Only 005 is passed and routed to the optical waveguide 3011 via the optical combiner 2908. On the other hand, the optical gate 300
The optical cell signal B incident on the light beam 7, 3008 is 3 in FIG.
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 when the electric pulse is V _H and the time when the header optical signal exists match, but the optical gate 3007 does not match. Therefore, the data portion of the optical cell signal B passes only the optical gate 3008 and is routed to the optical waveguide 2909 via the optical combiner 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 route to 08 or 2909. Also, the optical cell signal C incident on the optical gates 3005 and 3006.
Shows a header part at time t ₁ to t ₂ as shown in 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. Both the optical cell signals C and D may collide with each other due to the signal to be output to the optical waveguide 2908, and the header portion exists within the time when the applied voltage to the optical gates 3005 and 3007 is V _H. However, since the header portion of the optical cell signal C is incident on the optical gate 3005 first, the optical gate 3005 is switched to a state of passing the subsequent data portion first. When the optical gate 3005 shifts to this state, the injection current into the optical gate 3005 increases, and the voltage drop due to this current passing through the resistor 3020 lowers the applied voltage to the optical gate 3007.
The optical gate 3007 can no longer transmit the subsequent data portion of 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 combiner 3009. As described above, in FIG. 30, not only is the header portion of the optical cell signal self-routed depending on whether the time is t _{1 to} t ₃ or t _{3 to} t ₅ , but the header portion appears earlier within the time range. The optical signals are emitted from the optical waveguide 2908 or 2909 in this order.

[0008]

DISCLOSURE OF THE INVENTION Conventional optical AT described above
In the M switch, for example, N input terminal, N output terminal (N ×
In order to construct an optical ATM switch in which N and N are integers of 2 or more), at least N ² is considered in order to avoid collision of a plurality of optical cell signals at each of the N output terminals.
It is necessary to provide one time slot for the header optical signal for self-routing. Since the number of time slots increases as the number N of terminals of the optical ATM switch increases, the proportion of the header portion in the optical cell signal also increases, and there is a problem that the effective throughput of the data portion transfer decreases. Further, in the conventional optical ATM switch, the optical cell signals are given priorities in advance, and when the priority control is performed so that the optical cell signals are routed to the output terminal in the order according to this, the self-routing is performed. Since the time slot required for the header part for priority control is added to the number N ² of time slots, there is a problem that it is difficult to perform priority control without lowering the throughput.

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

An object of the present invention is to provide an optical ATM switch which can reduce the proportion of a header portion for self-routing in an optical cell signal, or can improve the effective throughput by using a plurality of optical self-routing circuits. Further, it is to provide an optical ATM switch capable of performing priority control by adding a priority control header section by reducing the proportion of the self-routing header section.

Another object of the present invention is to provide an optical ATM switch which enables broadcast connection according to the header portion of an optical cell signal, that is, optical broadcast control.

[0012]

The first aspect of the invention of the present application is n
(N is an integer of 2 or more) number of first input terminals and m (m is 2)
In the optical ATM switch having (first integer) number of first output terminals, n second input terminals connected to the first input terminal, second output terminals, and the first The output terminal group has m output terminal groups corresponding to the respective output terminals, each of the output terminal groups has n third output terminals, and the optical signal input to the second input terminal is a header. Self-routing to a 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. The detection signal indicating the second
An n-input, (n × m) -output optical self-routing circuit for outputting to an output terminal of the control circuit, a control circuit for outputting a control signal in accordance with the detection signal from the second output terminal, and n third Input terminals, a fourth input terminal, and n fourth output terminals, wherein n third output terminals of each of the output terminal groups are respectively n third input terminals. M n-input and n-output optical space switches that are connected and output the optical signal to a predetermined fourth input terminal according to the control signal input to the fourth input terminal; Optical buffer memories (n × m) connected to each of the n fourth output terminals of each of the optical space switches for storing and outputting the optical signal, and m optical space switches. From the n optical buffer memories connected to each of the n output terminals of M number of n to combine and output optical signals
It is equipped with a merger.

A second invention of the present application is 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. The wavelengths of the optical signals incident from the respective ones of the first input terminals are fixed at n wavelengths different from each other, and the n 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 a predetermined third output terminal according to header information and self-routed, and a detection signal indicating to which third output terminal the wavelength-multiplexed optical signal is self-routed is generated.
N-input and m-output optical self-routing circuits for outputting to the output terminals of the control circuit, a control circuit for outputting a control signal in response to the detection signal from the second output terminal, and m of the optical self-routing circuits. M number of n-branches connected to the third output terminals and branching the wavelength-multiplexed optical signal, and n number of n-numbers corresponding to the m number of the third output terminals of the optical self-routing circuit. Each having a third input terminal, a fourth input terminal, and a fourth output terminal,
Each of the m number of n-branches is connected to the third input terminal, and an optical signal of a predetermined wavelength is output from the wavelength-multiplexed optical signal according to the control signal input to the fourth input terminal. Select and output to the fourth output terminal (n ×
m) n variable wavelength selective elements and n corresponding to each of the m third output terminals of the optical self-routing circuit.
Are provided one by one and connected to each of the fourth output terminals of each of the (n × m) variable wavelength selection elements, and store (n × m) optical signals of the predetermined wavelength for output. An optical buffer memory and m n optical signals from the n optical buffer memories provided corresponding to each of the m third output terminals of the optical self-routing circuit are merged and output. It is equipped with a merger.

A third invention of the present application is 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 each composed of n optical signals having different wavelengths, and 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 to each group in advance, are incident from the groups one by one,
N second input terminals 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 wavelength-multiplexed into the predetermined third output terminal for each of the g wavelength groups according to the header information and the wavelength of the optical signal, and is self-routed. An n-input and m-output optical self-routing circuit for outputting to the second output terminal a detection signal indicating to which of the third output terminals the multiplexed optical signal is self-routed, and from the second output terminal A control circuit for outputting a control signal in response to the detection signal; and m n-branchers respectively connected to the m third output terminals of the optical self-routing circuit and branching the WDM optical signal. , The optical self-routing N branches corresponding to each of the m third output terminals of the path, each having 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 having a predetermined wavelength from the wavelength-multiplexed optical signal according to the control signal input to the fourth input terminal. (N × m) variable wavelength selection elements for outputting to the output terminals of the optical self-routing circuit and n of the third output terminals of the optical self-routing circuit are provided for each n.
(N × m) optical buffer memories connected to each of the fourth output terminals of each of the (n × m) variable wavelength selection elements to store and output the optical signal of the predetermined wavelength. ,
And m n combiners for combining and outputting the optical signals from the n optical buffer memories provided corresponding to the m third output terminals of the optical self-routing circuit. ing.

A fourth invention of the present application is 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) number of second output terminals, and n number of optical signals input to the second input terminal are sequentially output to the k number of second output terminals. Distribution circuit, n
N third input terminals connected one by one among the k second output terminals of each of the distribution circuits, a third output terminal, and the first output terminal Of m output terminals corresponding to each of the output terminals, each of the output terminal groups having n number of fourth output terminals, and the optical signal input to the third input terminal as header information. According to the predetermined fourth
Self-routing to the output terminal of the n-th output terminal, and outputs a detection signal indicating to which of the fourth output terminals the optical signal is self-routed to the third output terminal.
An optical self-routing circuit for input and (n × m) output,
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 number of the 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 for outputting a control signal in accordance with the detection signal from the output terminal of 3;
An n fifth input terminal to which the n fifth output terminals of the n combination circuits to which the n fourth output terminals of each of the output terminal groups are connected are connected; Input terminal of
m n inputs having n sixth output terminals and outputting the optical signal to a predetermined sixth output terminal in response to 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 to store and output the optical signal; , M n optical couplers connected to each of the n sixth output terminals of each of the m optical space switches to merge and output the optical signals from the n optical buffer memories. ing.

A fifth invention of the present application is 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 the respective ones of the first input terminals are fixedly defined at the respective n wavelengths different from each other, and the second input connected to the first input terminal is provided. A 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 distribution circuits for outputting to the second output terminals in sequence, and n number of the n second distribution terminals to which one of the k second output terminals of each of the n distribution circuits is connected. 3 input terminals, a third output terminal, and m number of fourth output terminals corresponding to each of the first output terminals, and a header for the optical signal input to the third input terminal. According to information, wavelength-multiplexed to a predetermined fourth output terminal and self-routed, and a detection signal indicating to which fourth output terminal the wavelength-multiplexed optical signal is self-routed is output to the third output terminal. The optical self-routing circuit of k n inputs and m outputs, the fourth input terminal of k pieces, and the fifth output terminal of the optical self-routing circuit of k pieces, Each of the fourth output terminals is one of the k fourth input terminals. M combining circuits each of which is connected to the k fourth input terminals, and sequentially outputs the wavelength-multiplexed optical signals connected to the k fourth input terminals to the fifth output terminal. And m branching devices connected to the fifth output terminals of the m combining circuits, respectively, for branching the wavelength-multiplexed optical signal, and the detection signals from the third output terminal. A control circuit that outputs a control signal in response to the control signal and n number of the fourth output terminals corresponding to the m number of the fourth output terminals of the optical self-routing circuit are provided, a fifth input terminal and a sixth input terminal. And a sixth output terminal,
Each of the n branching devices is connected to the fifth input terminal, and selects an optical signal of a predetermined wavelength from the wavelength multiplexed optical signal according to the control signal input to the sixth input terminal. And (n × m) variable wavelength selection elements for outputting to the sixth output terminal, and n pieces 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 to store and output the predetermined wavelength optical signal; M self-routing circuit and m n combiners for combining and outputting the optical signals from the n optical buffer memories provided corresponding to the m fourth output terminals, respectively. .

A sixth invention of the present application is 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 each composed of n optical signals having different wavelengths, and 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 different wavelengths, which are assigned to each group in advance, are respectively incident from each group,
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 second distribution circuits of each of the n distribution circuits.
Of n output terminals connected to each of the output terminals, a third output terminal, and m fourth output terminals corresponding to each of the first output terminals. , The optical signal input to the third input terminal is wavelength-multiplexed into the predetermined fourth output terminal for each of the g wavelength groups according to header information and the wavelength of the optical signal, and self-routed,
K number of n-input and 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; Each of the k optical self-routing circuits has four input terminals and a fifth output terminal.
Each of the four 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 connected to the fifth optical signal. A number of combining circuits for outputting to the output terminals of M, n number of branching units connected to the fifth output terminals of each of the m combining circuits for branching the wavelength division multiplexed optical signal, and A control circuit that outputs a control signal according to the detection signal from the third output terminal and n pieces of the fourth output terminals of the optical self-routing circuit are provided corresponding to n pieces, respectively. 5
Input terminals, a sixth input terminal, and a sixth output terminal, and each of the m n-branches is connected to the fifth input terminal and is input to the sixth input terminal. An optical signal of a predetermined wavelength is selected from the wavelength-division-multiplexed optical signal according to the control signal and output to the sixth output terminal (n
Xm) variable wavelength selection elements and n number of variable wavelength selection elements corresponding to each of the m fourth output terminals of the optical self-routing circuit, and (nxm) variable 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 combiners for combining and outputting the optical signals from the n optical buffer memories provided corresponding to the respective output terminals.

A seventh invention of the present application is 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. The output terminal includes n second input terminals connected to the first input terminal, a second output terminal, and a group of m output terminals corresponding to each of the first output terminals. Each of the terminal groups has n third output terminals, and an optical signal input to the second input terminal is self-routed to a predetermined third output terminal according to first header information. , Outputting to the second output terminal a detection signal indicating to which of the third output terminals the optical signal is self-routed.
An optical self-routing circuit for input (n × m) output, a control circuit for outputting a control signal according to the detection signal from the second output terminal, n third input terminals, and a fourth
Input terminals and n fourth output terminals, and the n third output terminals of each of the output terminal groups are connected to the n third input terminals, respectively. The first of n number of n inputs and n outputs for outputting the optical signal to the predetermined fourth output terminal according to the control signal input to the input terminal
Optical space switch, a first input terminal connected to the first n number of the fourth output terminals, and a number p (p is 2 or more) equal to the number of prioritized sequential numbers attached in advance to the optical signal. (Integer) number of fifth output terminals, and outputs the optical signal input to the fifth input terminal to the predetermined fifth signal according to the second header information.
Connected to (n × m) second optical space switches and (n × m) second optical space switches for each of the p fifth output terminals for self-routing And (n × m) optical buffer memory groups consisting of p optical buffer memories for storing and outputting the optical signals corresponding to the priority order, and n fourth optical space 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 According to the third header information from the (p × m) first n combiners for output and the p optical signals from the first n combiner corresponding to the first optical space switch. M first p-input, single-output third light that preferentially outputs one signal And a while the switch.

The eighth invention of the present application is 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. The wavelengths of the optical signals incident from the respective ones of the first input terminals are fixedly defined as the respective n wavelengths different from each other, and the n number of the n-th wavelengths connected to the first input terminal are fixed. Two input terminals, a second output terminal, and m third output terminals corresponding to the first output terminals, respectively.
Wavelength-multiplexed the optical signal input to the input terminal of the same to the predetermined third output terminal according to the first header information, and self-routes the wavelength-multiplexed optical signal to which third output terminal. An n-input, m-output optical self-routing circuit that outputs a detection signal indicating whether the detection signal has been output to the second output terminal, and a control circuit that outputs a control signal in accordance with the detection signal from the second output terminal , M number of n-branching devices connected to the m number of third output terminals and branching the wavelength-multiplexed optical signal, and n number of n-number of branching devices corresponding to each of the m number of third output terminals. A third input terminal, a fourth input terminal, and a fourth output terminal, each of the outputs of the m number of n-branchers is connected to the third input terminal. According to the control signal input to the input terminal 4 Select an optical signal having a predetermined wavelength from said wavelength multiplexed optical signal to output to said fourth output terminal (n
Xm) 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 given 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 (n × m) optical spatial switches, each of which is connected to the p fifth output terminals,
P for storing and outputting the optical signal corresponding to the priority
N optical buffer memory groups each including (n × m) optical buffer memories and n corresponding to each of the third output terminals.
The fourth of each of the variable wavelength selection elements provided individually
The optical signals of the same priority from the optical buffer memory group corresponding to each of the n optical space switches whose output terminals are connected to the fifth input terminal are merged and output (p × m) One optical signal is preferentially output from the n optical multiplexers and the p optical signals from the n optical multiplexers corresponding to the third output terminals according to the third header information, m
2 p-input, 1-output second optical space switches.

The ninth invention of the present application is 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 each composed of n optical signals having different wavelengths, and 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 different wavelengths, which are assigned to each group in advance, are respectively incident from each group,
N second input terminals 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 output to the predetermined third output terminal according to the first header information and the wavelength of the optical signal.
N input and m output for outputting wavelength-multiplexed and self-routed wavelength groups for each wavelength group and outputting to the second output terminal a detection signal indicating to which of the third output terminals the wavelength-multiplexed optical signal is self-routed. An optical self-routing circuit, a control circuit for outputting a control signal in response to the detection signal from the second output terminal, and m number of third output terminals of the optical self-routing circuit are respectively connected, M n branching devices for branching the wavelength division multiplexed optical signal,
N pieces are provided corresponding to each of the m pieces of the third output terminals of the optical self-routing circuit, each of which has a third input terminal, a fourth input terminal, and a fourth output terminal. m
Each of the n branching devices is connected to the third input terminal, and selects 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) variable wavelength selection elements to be output 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. Of p (p is an integer equal to or greater than 2) fifth output terminals, the optical signal input to the fifth input terminal being the predetermined first 5 (n × m) first optical space switches for self-routing to 5 output terminals, and (n × m) p optical output switches connected to each of the p fifth output terminals, It is composed of p optical buffer memories for storing and outputting the optical signals corresponding to the priority order. The (n × m) optical buffer memory group and the fifth input to the fourth output terminal of each of the variable wavelength selection elements provided in n number corresponding to each of the third output terminals. The optical signals of the same priority from the optical buffer memory group corresponding to each of the n optical space switches to which terminals are connected are merged and output (p
Xm) n optical combiners and one optical signal is preferentially output from the p optical signals from the n optical multiplexers corresponding to the third output terminals according to the third header information. , M p-inputs, 1-output second optical space switch.

The tenth invention of the present application comprises 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 composed of an optical gate that transmits a data portion of the optical cell signal thereafter only when a header signal and an electrical signal of the optical cell signal are simultaneously applied,
The data portion is self-routed to a predetermined output terminal according to the header signal placed in m time slots provided corresponding to each of the m output terminals, It is characterized in that the optical header signals are placed in a plurality of time slots among the m pieces 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 and a broadcast control signal which are connected one by one to n (n is an integer of 2 or more) first input terminals. Are stored and then output, and one of each of the n optical buffer memories is connected to each of the n second input terminals, and each of the n optical buffer memories is connected to the header signal and the electrical signal of the optical cell signal. Only when they are applied at the same time, a number of optical signals equal to the number of the first header signals included in the optical cell signals, which are composed of optical gates that transmit the data portion of the optical cell signals, are generated, and m (m is (Integer of 2 or more) a first optical self-routing circuit for self-routing to the first output terminals, the light having the n first input terminals and the m first output terminals. Copy circuit and m of the optical copy circuit One of the output terminals is connected to each of the output terminals, and m header insertion circuits for adding a second header signal for performing self-routing to an incident optical signal, m third input terminals and m A plurality of second output terminals, each of the m header insertion circuits having m third output terminals.
Of the optical signal according to the second header signals placed in the m time slots provided corresponding to the m second output terminals, respectively. And an optical self-routing circuit for self-routing to the second output terminal of the optical cell circuit, wherein the optical copy circuit generates a number of data sections equal to the number of first header signals of the optical cell signal, Each of the header inserting circuits adds the second header signal to each of the data parts generated by the optical copy circuit, and the optical self-routing circuit determines the data part according to the second header signal. Is self-routed to the second output terminal.

[0023]

In the optical ATM switch of the present invention, the optical buffer memory is arranged immediately before the output terminal, and even if a plurality of optical cell signals destined for the same output terminal are inputted at the same time, the optical self-routing circuit makes a plurality of optical signals. The plurality of optical cell signals are once written in the buffer memory and then sequentially output. Therefore, it suffices to set only the time slot corresponding to each output terminal in the header part of the optical cell signal. For example, when configuring an N × N optical ATM switch, the number of time slots required in the header part is N. The conventional optical AT
The M switch can reduce the number of time slots N ² required at least in the header portion to 1 / N, and the proportion of the header portion in the optical cell signal can be reduced, thereby improving the effective throughput.

Further, in the optical ATM switch of the present invention, since 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, the number of time slots required for the header portion is further increased. N / g (g is the number of wavelength groups) can be reduced, and the effective throughput is further improved.

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

Furthermore, since the optical ATM switch of the present invention can reduce the number of time slots in the header section necessary for self-routing, it is possible to add a header section for priority control and perform priority control.

In the broadcast control method of the optical ATM switch according to the present invention, the header of the optical cell signal is used by using the optical self-routing circuit for placing the header portion of the optical cell signal in the time slot corresponding to the output terminal and performing the self-routing. Since the unit is placed in a time slot corresponding to a plurality of predetermined output terminals and the optical signal copying operation and the self-routing operation are performed at the same time, the optical signal broadcast control can be performed.

Further, in the broadcast control system of the optical ATM switch of the present invention, the optical copy circuit performs the copy of the optical signals of the number equal to the number of the headers of the optical cell signals, and the individual optical signals copied thereafter. Since the optical self-routing circuit self-routes one to one to the predetermined output terminals, the broadcast optical cell signal can be sent to the optical self-routing circuit even when the connections to the predetermined plurality of output terminals are not open at the same time.

[0029]

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.times.2). The optical cell signals A and B or the optical cell signal C. D enters the 2 × 4 optical self-routing circuit 103 from the optical waveguides 101 and 102, respectively. The output optical signal of the optical self-routing circuit 103 is sent to the 2 × 2 optical space switch 108 via the optical waveguides 104 and 105, or to the optical waveguide 10.
It is sent to the 2 × 2 optical space switch 109 via 6, 107. The output optical signals of the 2 × 2 optical space switch 108 sent to the optical waveguides 110 and 111 are input to the optical buffer memories 114 and 115, respectively. Optical waveguides 112 and 11
The output optical signals of the 2 × 2 optical space switch 109 sent to the optical fiber 3 are input to the optical buffer memories 116 and 117, respectively. The optical buffer memories 114 to 117 store the input optical signals, and the first in / first out (FI
The optical signal stored in the (FO) operation is emitted. The output optical signals of the optical buffer memories 114 and 115 are output from the optical waveguide 120 via the combiner 118. The output optical signals of the optical buffer memories 116 and 117 are output from the optical waveguide 121 via the combiner 119.

2 × 4 optical self-routing circuit 103
Outputs to the control circuit 140 a detection signal 130 indicating to which of the optical waveguides 104 and 105 or the optical waveguides 106 and 107 the input optical cell signal is transmitted. In the control circuit 140, 2
Each control signal 13 of the × 2 optical space switches 108 and 109
1,132 is generated.

The 2 × 2 optical space switch 108 is provided with the optical waveguide 104, in response to a control signal 131 from the control circuit 140.
The optical signals respectively input via the optical waveguides 105
The signals are alternately sent to the optical buffer memories 114 and 115 via 0 and 111. The 2 × 2 optical space switch 109 is responsive to a control signal 132 from the control circuit 140 to output the optical waveguide 10
The optical signals input via 6 and 107 are input to the optical waveguide 1
It is sequentially sent to the optical buffer memories 116 and 117 via 12 and 113. The optical buffer memories 114, 115 or 116, 117 store the input optical signals and send the optical signals stored in the first-in / first-out operation to the combiner 118 or 119.

FIG. 2 is a concrete configuration diagram of the 2 × 4 optical self-routing circuit 103 in FIG. In FIG.
The optical waveguides 101, 102, 104 to 107 respectively correspond to the optical waveguides of FIG. 1, and the optical cell signals A or C, B or D input to the optical waveguides 101 and 102 are respectively output by the optical branching devices 203 and 204. It is branched into two and is incident on the optical gates 205, 206 and 207, 208. Optical gate 205, 20
The output optical signals of 6, 207 and 208 are the optical waveguides 10 respectively.
It 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.

Detectors 230 to 233 are connected to the terminals of the optical gates 205 to 208, respectively.
Numerals 30 to 233 detect whether or not the optical cell signal passes through the optical gates 205 to 208 by the change of the terminal voltage of each optical gate 205 to 208, and the detection signals 240 to 243 are used 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 light source 5, 206 is 303 in FIG.
As shown in, the header optical signal exists only between times t ₁ and t ₂ . Therefore, in the optical gate 205, the time of the electric pulse V _H and the time of the optical signal of the header portion match, but the optical gate 206 does not match. Therefore, the data portion of the optical cell signal A passes through only the optical gate 205 and is routed to the optical waveguide 104. On the other hand, the optical cell signal B incident on the optical gates 207 and 208 is 3 in FIG.
As shown in 04, the header optical signal exists only between t ₂ and t ₃ . Therefore, in the optical gate 208, the time when the electrical pulse is V _H and the time when the optical signal in the header portion is present match, but the optical gate 207 does not. Therefore, the data portion of the optical cell signal B passes through only the optical gate 208 and is routed to the optical waveguide 107. The optical cell signal C incident on the optical gates 205 and 206 in FIG. 2 has a header optical signal only between times t ₁ and t ₂ as indicated by 305 in FIG. Therefore, in the optical gate 205, the time of the electric pulse V _H and the time of the optical signal of the header portion match, but the optical gate 206 does not match.
Therefore, the data portion of the optical cell signal C passes through only the optical gate 205 and is routed to the optical waveguide 104. On the other hand, the optical cell signal D incident on the optical gates 207 and 208
As shown by 306 in FIG. 3, the header optical signal exists only between times t ₁ and t ₃ . Therefore, the optical gate 20
In FIG. 7, the time when the electric pulse is V _H and the time when the optical signal in the header portion is present match, but the optical gate 208 does not. Therefore, the data portion of the optical cell signal D is the optical gate 2
Only 07 is transmitted to be 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 or not

As described above, in the optical ATM switch of 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 optical A with the same number of terminals.
The number of required time slots can be halved compared to the time slot number of 4 required by the TM switch,
Therefore, it is possible to reduce the proportion of the header portion in the optical cell signal and improve the throughput of the data portion transfer.

FIG. 4 is a block diagram showing an embodiment of the second invention 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
The output signal of the variable wavelength selecting element 4 is sent to the variable wavelength selecting elements 408 and 409 via the optical waveguide 404 and the branching device 406, or the variable wavelength selecting element 4 via the optical waveguide 405 and the branching device 407.
It is sent to 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 signal and output the optical signal stored in the first-in / first-out operation. The output optical signals of the optical buffer memories 416 and 417 are emitted from the optical waveguide 422 via the combiner 420, and the output optical signals of the optical buffer memories 418 and 419 are emitted from the optical waveguide 423 via the combiner 421.

2 × 2 optical self-routing circuit 403
Outputs a detection signal 430 indicating to which of the optical waveguides 404 and 405 the input optical cell signal is transmitted. The control circuit 440 controls the variable wavelength selection elements 408 to 411 according to the detection signal 430.
~ 434 is generated. Variable wavelength selection element 408, 409
Selects an optical signal of a predetermined wavelength from the optical signals respectively input according to the control signals 431 and 432 from the control circuit 440, and alternately sends them to the optical buffer memories 416 and 417. Further, the variable wavelength selection elements 410 and 411 select optical signals of a predetermined wavelength from the optical signals respectively input according to the control signals 433 and 434 from the control circuit 440, and output the optical signals to the optical buffer memories 418 and 419. Send alternately. Optical buffer memory 416, 417 or 418,
Reference numeral 419 stores the input optical signal, and the first-in /
The optical signal stored in the first-out operation is merged into the confluencer 420.
Alternatively, it is sent to 421.

FIG. 5 is a concrete 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 branching devices 503. , 504 and the optical gate 505 is branched into two.
It is incident on 506, 507, and 508. Light gate 50
The output optical signals of 5, 507 are combined by the optical combiner 509 and emitted from the optical waveguide 404. Optical gates 506 and 508
The output optical signals from the optical waveguide 40 are combined by the optical combiner 510.
It is emitted from 5. The electric pulse generation circuit 513 applies the same electric pulse to the optical gates 505 and 507 via the resistors 520 and 522, respectively, 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 or not an optical cell signal passes through the optical gates 505 to 508 by a change in the terminal voltage of each optical gate 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 an electric pulse applied to the optical gates 505 and 507 in FIG. 5, which is V _H during the time t _{1 to} t _{2 and} V during the time t ₂ to t _6.
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.
In the optical cell signal A having the wavelength λ ₁ incident on the light sources 5, 506, as shown by 603 in FIG. 6, the header portion optical signal exists only between the times t _{1 and} t ₂ . Therefore, in the optical gate 505, the time of the electric pulse V _H and the time of the optical signal of the header portion match, but the optical gate 506 does not match.
Therefore, the data portion of the optical cell signal A passes through only the optical gate 505 and is routed to the optical waveguide 404 via the optical combiner 509. On the other hand, the optical cell signals B of the wavelength lambda ₂ incident on the optical gates 507 and 508, as shown in 604 of FIG. 6, the header portion optical signal only during the time t ₂ ~t ₃ is present. Therefore, in the optical gate 508, the time of the electric pulse V _H and the time of the optical signal of the header portion match, but the optical gate 507 does not match. 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 combiner 510.
The wavelength λ incident on the optical gates 505 and 506 in FIG.
_As shown by 605 in FIG. 6, the optical cell signal C of ₁ has a header portion 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 optical signal of the header portion.
06 does not match. Therefore, the data part of the optical cell signal C passes through only the optical gate 505 and is routed to the optical waveguide 404 via the optical combiner 509. On the other hand, the optical cell signal D having the wavelength λ ₂ incident on the optical gates 507 and 508.
As shown by 606 in FIG. 6, the header optical signal exists only between times t _{1 and} t ₂ . Therefore, the optical gate 50
In FIG. 7, the time when the electric pulse is V _H and the time when the optical signal in the header portion is present match, but the optical gate 508 does not match. Therefore, the data portion of the optical cell signal D is the optical gate 5
07 through the optical combiner 509 to be wavelength-multiplexed with the data portion of the optical cell signal C having the wavelength λ _{1 and} the optical waveguide 404.
Is routed to.

As described above, in the 2 × 2 optical self-routing circuit 403 in FIG. 4, depending on whether the header portion of the optical packet signal is at time t _{1 to} t ₂ or t _{2 to} t ₃ , Self-routes to the optical waveguide 404 or 405. With such a photonic ATM switch of FIG. 4, may be prepared two time slots in the header portion for the self-routing equal to the number of output terminals, the time t ₁ ~t ₂ and t ₂ ~t ₃ only, The number of required time slots can be halved compared to the number of required time slots of 4 in the conventional optical ATM switch having the same number of terminals, so that the proportion 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 a case of two input terminals and four output terminals (2.times.4). Each wavelength λ _11, λ ₂₁ and lambda ₁₁ of optical cell signals A, C
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 are input.
The optical cell signals B, D and F of the
It is input to the optical self-routing circuit 703. 2x4
The output signal of the optical self-routing circuit 703 is transmitted via the optical waveguide 704 and the branching device 708 to the variable wavelength selection element 71.
2, 713, or to the variable wavelength selection elements 714 and 715 via the optical waveguide 705 and the branching device 709, or to the variable wavelength selection elements 716 and 717 via the optical waveguide 706 and the branching device 710, or Variable wavelength selecting element 718 via optical waveguide 707 and branching device 711,
It is sent to 719. Variable wavelength selection element 712-719
Output optical signals are sent to the optical buffer memories 728 to 735 via the optical waveguides 720 to 727, respectively. The optical buffer memories 728 to 735 store the input optical signal,
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 combiner 736, and the output optical signals of the optical buffer memories 730 and 731 are output from the optical waveguide 741 via the combiner 737, and the optical buffer The output optical signals of the memories 732 and 733 are emitted from the optical waveguide 742 via the combiner 738, and the output optical signals of the optical buffer memories 734 and 735 are combined.
It is emitted from the optical waveguide 743 via 39.

2 × 4 optical self-routing circuit 703
Sends to the control circuit 760 a detection signal 750 indicating to which of the optical waveguides 704 to 707 the input optical cell signal has been sent. The control circuit 760 generates control signals 751 to 758 of the variable wavelength selection elements 712 to 719 according to the detection signal 750. The variable wavelength selection elements 712 and 713 are control signals 75 from the control circuit 760.
1, 752, optical signals of a predetermined wavelength are selected from the optical signals respectively input, and the optical buffer memories 728, 7
Alternately sent to 29. In addition, the variable wavelength selection elements 714,
715 is a control signal 753, 754 from the control circuit 760.
The optical signals of a predetermined wavelength are selected from the optical signals input according to the above, and are alternately transmitted to the optical buffer memories 730 and 731. The variable wavelength selection elements 716 and 717 select optical signals of a predetermined wavelength from the optical signals input according to the control signals 755 and 756 from the control circuit 760, and alternately select the optical signals to 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 respectively input according to the control signals 757 and 758 from the control circuit 760, and alternately select 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 734, 735 store the input optical signal, and the optical signal stored by the first-in / first-out operation is merged with the combiner 736 or 737.
Alternatively, it is sent to 738 or 739.

FIG. 8 is a concrete configuration diagram of the 2 × 4 optical self-routing circuit 703 in FIG. In FIG.
Optical waveguides 701, 702, 704, 705, 706, 7
07 correspond to the optical waveguides of FIG. 7, respectively.
The optical cell signal A or C or E input from 01 is divided into four by the branching device 803 and is incident on 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 branching device 804 and is incident on the optical gates 809 to 812. Light gate 8
The output optical signals of 05 and 809, 806 and 810, 807 and 811, and 808 and 812 are optical combiners 813 to 813, respectively.
It is output from the optical waveguides 704, 705, 706, and 707 via 16. The electric signal pulse generation circuit 823 is connected to the optical gates 805 and 809 via resistors 830 and 834, respectively.
Further, resistors 831 and 835 are provided to the optical gates 806 and 810, respectively.
Through the optical gates 807 and 811, respectively.
2, 836, and further to the optical gates 808 and 812 through the resistors 833 and 837, respectively, different electric pulses are applied for every two elements. Detectors 840 to 847 are connected to the terminals of the optical gates 805 to 812, respectively, and the detectors 840 to 847 change the terminal voltage of the optical gates 805 to 812 so that the optical cell signals are transmitted to the optical gates 805 to 805. 8
It is detected whether or not the signal passes 12 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 indicates 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. 902 is 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, one optical cell signal having wavelengths λ ₁₁ and λ ₂₁ is input from the optical waveguide 701, and one optical cell signal having wavelengths λ ₁₂ and λ ₂₂ is input from the optical waveguide 702. Optical gates 805, 809 and 80 in FIG.
Nos. 7 and 811 show the wavelength λ when the header optical signal is incident while V _H is being applied and while V _L1 is being applied thereafter.
The optical signal of the wavelength group Λ ₁ including ₁₁ and λ ₁₂ is transmitted.
Also, the optical gates 806 and 810 and 808 and 812 of FIG.
When a header optical signal is input while V _H is being applied, the optical signal of wavelength group Λ ₂ including wavelengths λ ₂₁ and λ ₂₂ is transmitted while V _L2 is applied thereafter.

First, the optical cell signal A having the wavelength λ ₁₁ and the wavelength λ ₂₂
An example of the case where the optical cell signal B in FIG. 8 is incident from the optical waveguides 701 and 702 in FIG. 8 will be described. Light gate 80
The optical cell signal A of wavelength λ ₁₁ incident on 5 to 808 has a header portion optical signal only between times t _{1 and} t ₂ as indicated by 905 in FIG. In the optical gates 805 and 806, the time when the electric pulse is V _H and the time when the header optical signal of the optical cell signal A is present coincides with each other.
No match at 808. Further, since the optical gate 805 transmits the optical signal of the wavelength group Λ ₁ including the wavelengths λ ₁₁ and λ ₁₂ while V _L1 is being applied, the data portion of the optical cell signal A transmits only the optical gate 805. It is routed to the optical waveguide 704 via the optical combiner 813. On the other hand, the optical cell signal B having the wavelength λ ₂₂ which is incident on the optical gates 809 to 812.
As shown by 906 in FIG. 9, the header section optical signal exists only between times t _{1 and} t ₂ . Optical gate 809, 810
Then, the time when the electric pulse is V _H coincides with the time when the optical signal of the header portion of the signal B exists, but the optical gates 811 and 8
12 does not match. Further, the optical gate 810 has a wavelength group Λ including 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 only through the optical gate 810 and is routed to the optical waveguide 705 via the optical combiner 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 respectively incident from the waveguides 701 and 702 will be described. Optical gates 805-80 of FIG.
The optical cell signal C of wavelength λ ₂₁ incident on
As shown in FIG. 6, the header optical signal exists only between times t _{1 and} t ₂ . In the optical gates 805 and 806, the time when the electric pulse is V _H and the time when the header optical signal of the optical cell signal C exists, but the optical gates 807 and 808 do not match. Further, since the optical gate 806 transmits the optical signal of the wavelength group Λ ₂ including the wavelengths λ ₂₁ and λ ₂₂ while V _L2 is being applied, the data portion of the optical cell signal C transmits only the optical gate 806. It is routed to the optical waveguide 705 via the optical combiner 814. On the other hand, the optical gate 809-
The optical cell signal D having the wavelength λ ₁₂ incident on 812 is indicated by 9 in FIG.
As indicated by 07, the header optical signal exists only between times t _{2 and} t ₃ . In the optical gates 811 and 812, the time when the electric pulse is V _H and the time when the header optical signal of the optical cell signal D exists are the same, but the optical gates 809 and 810
Does not match. Further, since the optical gate 811 transmits the optical signal of the wavelength group Λ ₁ including the wavelengths λ ₁₁ and λ ₁₂ while V _L1 is being applied, the data portion of the optical cell signal D transmits only the optical gate 811. It is routed to the optical waveguide 706 via the optical combiner 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 of (1) is incident from each of the optical waveguides 701 and 702 will be described. Optical gate 805 of FIG.
The optical cell signal E having the wavelength λ ₂₁ incident on the 808 has a header optical signal only between times t _{2 and} t ₃ , as indicated by 909 in FIG. 9. In the optical gates 807 and 808, the time when the electric pulse is V _H and the time when the header optical signal of the optical cell signal E exists are the same, but the optical gates 805 and 80
6 does not match. Further, the optical gate 808 has a wavelength group Λ ₂ including wavelengths λ ₂₁ and λ ₂₂ while V _L2 is applied.
, The data portion of the optical cell signal E is transmitted only through the optical gate 808 and is routed to the optical waveguide 707 via the optical combiner 816. On the other hand, the optical gate 80
The optical cell signal F having the wavelength λ ₂₂ that is incident on 9 to 812 has a header optical signal only between times t _{2 and} t ₃ , as indicated by 910 in FIG. 9. In the optical gates 811 and 812, the time when the electric pulse is V _H and the time when the header optical signal of the optical cell signal F exists are the same, but the optical gates 809 and 8
10 does not match. Further, the optical gate 812 has a wavelength group Λ including 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 combiner 816. In this case, the optical cell signals E and F are wavelength-multiplexed by the optical combiner 816 and simultaneously self-routed to the optical waveguide 707.

As described above, in the 2 × 4 optical self-routing circuit 703 of FIG. 7, the time t ₁ to t ₂ or t _{2 to} t _{3 at} which the header portion 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 Λ ₁ or Λ 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 as compared with the number of time slots required for an optical ATM switch having the same number of terminals, and the throughput can be reduced by reducing the proportion of the header portion in the optical cell signal. It is possible to improve.

FIG. 10 is a block diagram showing an embodiment of the fourth invention of the present invention, showing a case of two input terminals and two output terminals (2.times.2). The optical signals A and B in the data section are the optical waveguide 100
1,1002 input to the distribution circuit 1003,10
Sent to 04. The distribution circuit 1003 outputs the optical cell signal A, which is obtained by adding the destination information to the input optical signal A of the data section, to the optical signal 1005 or 1007 by 2 × 4.
Optical self-routing circuit 1009 or 1010
To either one of. Also, the distribution circuit 1004
Is the optical waveguide 1006 or 100 which is the optical cell signal B obtained by adding the destination information to the input data optical signal B.
It is sent to either of the 2 × 4 optical self-routing circuit 1009 or 1010 via 8

2 × 4 optical self-routing circuit 1009
Output optical signals of the optical waveguides 1011 and 1013 to the combining circuits 1019 and 1020, respectively, or the optical waveguide 10
15 and 1017 to synthesize circuits 1021 and 1022, respectively.
Sent to. 2 × 4 optical self-routing circuit 1
The output optical signal of 010 is sent to the combining circuits 1019 and 1020 by the optical waveguides 1012 and 1014, or the optical waveguide 1
Combiner circuits 1021, 102 via 016, 1018, respectively.
2 is sent.

The combined output optical signal of each of the combining circuits 1019 and 1020 passes through the optical waveguides 1023 and 1024 for 2 ×.
2 Optical space switch 1027 is sent to the composite circuit 1
The output optical signals of 021 and 1022 are the optical waveguides 102, respectively.
It is sent to the 2 × 2 optical space switch 1028 via 5, 1026. 2 sent to the optical waveguides 1029 and 1030
The 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 output from the optical buffer memory 103.
5, 1036. Optical buffer memory 1033
Reference numerals 1036 to 1036 store the input optical signal, and emit the optical signal stored in 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 combiner 1037. The output optical signals of the optical buffer memories 1035 and 1036 are output from the optical waveguide 1040 via the combiner 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 to which of the optical waveguides 1012, 1014, 1016, 1018 the optical waveguide is transmitted.
1 is output. The control circuit 1070 detects the detection signal 105.
0x1051, a 2x2 optical space switch 1027,
The control signals 1060 and 1061 of 1028 are generated.
The 2 × 2 optical space switch 1027 is responsive to the control signal 1060 from the control circuit 1070 to output the optical waveguides 1023, 102.
The optical signals respectively inputted via the optical waveguides 1029,
The data is alternately sent to the optical buffer memories 1033 and 1034 via 1030. The 2 × 2 optical space switch 1028 receives the optical signals input via the optical waveguides 1025 and 1026 according to the control signal 1061 from the control circuit 1070.
Optical buffer memory 1 via optical waveguides 1031 and 1032.
Alternately sent to 035 and 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 combiner 1037 or 10
38.

FIG. 11 shows the distribution circuit 100 in FIG.
3, 2 × 4 optical self-routing circuit 1009, 101
8 is a timing chart for explaining the operation of 0 and the synthesizing circuit 1019. In FIG. 11, reference numeral 1101
Is a data portion 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 section optical signals D1 to D3 and the destination information, adds the header section optical signals H1 to H3 to the data section optical signals D1 to D3 in accordance with the destination information, and outputs the optical cell signals 1 to 1, respectively. 3 is generated, the optical cell signals 1 and 3 are sent to the 2 × 4 optical self-routing circuit 1009 as indicated by 1102, and the optical cell signal 2 is sent to the 2 × 4 optical self-routing circuit 1010 as indicated by 1103. .

The optical self-routing circuit 1009 receives the header optical signals H1 and H of the optical cell signals 1 and 3 to be input.
The data portion optical signals D1 and D3 are self-routed in accordance with No. 3, and the data portion optical signals D1 and D3 shown in 1104, for example, are sent to the combining circuit 1019. Further, the optical self-routing circuit 1010 self-routes the data section optical signal D2 according to the input header section optical signal H2 of the optical cell 2, and, for example, the data section optical signal D2 shown at 1105.
Is also sent to the synthesis circuit 1019. Synthesis circuit 101
Since the optical signals indicated by 9, 1104 and 1105 are input and combined, as indicated by 1106, the data portion optical signal D1
~ D3 is output from the combining circuit 1019.

As described above, in FIG. 10, a plurality of optical self-routing circuits are used, and while one optical self-routing circuit transfers the data portion of the optical cell signal, another optical self-routing circuit performs the following operation. Since the header portion of the optical cell signal is processed, the effective throughput is improved.

FIG. 12 is a block diagram of the fifth embodiment of the present invention, showing a case of two input terminals and two output terminals (2.times.2). The data optical signals A and B having the wavelengths λ ₁ and λ ₂ , respectively, 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 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 outputs the optical cell signal B obtained by adding the destination information to the input optical data signal B of the wavelength ₂ by 2 × 2 via the optical waveguide 1206 or 1208.
It is sent to either the optical self-routing circuit 1209 or 1210.

2 × 2 optical self-routing circuit 1209
The output optical signal of the
15 or via 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 combining circuit 1215 is sent to the variable wavelength selecting elements 1219 and 1220 via the branching device 1217, and the output optical signal of the combining circuit 1216 is output to the branching device 1.
It is sent 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 signal and output the optical signal stored in the first-in / first-out operation. Optical buffer memory 1227, 122
The output optical signal of 8 is sent to the optical waveguide 123 via the combiner 1231.
3 and the optical buffer memories 1227, 12
The output optical signal of 30 passes through the combiner 1232 to the optical waveguide 12
It is emitted from 34.

2 × 2 optical self-routing circuit 1209
Alternatively, reference numeral 1210 denotes a detection signal 124 indicating to which of the optical waveguides 1211, 1213 or 1212, 1214 the input optical cell signal is transmitted.
0,1241 is output. The control circuit 1260 controls the variable wavelength selection element 1219 according to the detection signals 1240 and 1241.
Control signals 1250 to 1253 of 1222 to 1222 are generated. The variable wavelength selection elements 1219, 1220 select an optical signal of a predetermined wavelength from the optical signals respectively input according to the control signals 1250, 1251 from the control circuit 1260 and send it to the optical buffer memories 1227, 1228. .
Further, the variable wavelength selection elements 1221 and 1222 select optical signals of a predetermined wavelength from the optical signals respectively input according to the control signals 1252 and 1253 from the control circuit 1260, and output them to the optical buffer memories 1229 and 1230. Send out. Optical buffer memory 1227, 1228 or 12
29 and 1230 store the input optical signal, and send the optical signal stored in the first-in / first-out operation to the combiner 1231 or 1232. 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
8 is a timing chart for explaining the operation of 0 and the synthesizing circuit 1215. In FIG. 13, reference numeral 1301
Is the wavelength λ input to the distribution circuit 1203 in FIG.
_One data signal, 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 the header optical signals H1 to H3 in accordance with the destination information to generate the optical cell signals 1 to 3, and outputs the optical cells as indicated by 1302. 2 × 2 optical self-routing circuit 1209 for signals 1 and 3
To the optical cell signal 2 as shown at 1303
It is sent to the optical self-routing circuit 1210. The optical self-routing circuit 1209 receives the input optical cell signal 1
The data section optical signals D1 and D3 are self-routed according to the header section optical signals H1 and H3 of 3 and 3, and the synthesizing circuit 12
15 shows data signal optical signals D1 and D3 shown in 1304, for example.
Is sent. In addition, the optical self-routing circuit 1210
Self-routes the data section optical signal D2 in accordance with the input header section optical signal H2 of the optical cell 2, and the data section optical signal D2 indicated by 1305, for example, is also synthesized.
215. The synthesis circuit 1215 is 1304, 13
Since the optical signals indicated by reference numeral 05 are input and combined, the optical signals D1 to D3 of the data portion are combined by the combining circuit 1 as indicated by 1306.
It is output from 215.

As described above, also in the case of FIG. 12, a plurality of optical self-routing circuits are used, and 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 portion of the next optical cell signal, the effective throughput is improved.

FIG. 14 is a block diagram of the sixth embodiment of the present invention, showing the case of two input terminals and four output terminals (2.times.4). The optical signals A and C having the wavelengths λ ₁₁ and λ ₂₁ are input from the optical waveguide 1401 one by one, and the distribution circuit 1
The data section optical signals B and D having the wavelengths λ ₁₂ and λ ₂₂ are input from the optical waveguide 1402, respectively, and sent to the distribution circuit 1404. Distribution circuit 14
Reference numeral 03 denotes a 2 × 4 self-routing circuit 1 for an optical cell signal A in which the destination information is added to the input data optical signal A of the wavelength λ ₁₁ via the optical waveguide 1405 or 1407.
It is sent to either 409 or 1410. In addition, the distribution circuit 1403 outputs the optical cell signal C, which is obtained by adding the destination information to the input optical data signal C of the wavelength λ ₂₁ , to either the 2 × 4 optical self-routing circuit 1409 or 1410 via the optical waveguide 1403 or 1407. Send out. Further, the distribution circuit 1404 outputs the optical cell signal B obtained by adding the destination information to the input data optical signal B of the wavelength λ ₁₂ by 2 × 4 via the optical waveguide 1406 or 1408.
It is sent to one of the optical self-routing circuits 1409 and 1410. Further, the distribution circuit 1404 outputs 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.
2 × 4 optical self-routing circuit 1409, 14
Send from which of 10.

2 × 4 optical self-routing circuit 1409
The output optical signal of the
19 or the synthetic circuit 14 via the optical waveguide 1413
20 or via the optical waveguide 1415 to the synthesis circuit 14
21 or via the optical waveguide 1417 to the synthesis circuit 14
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, or to the combining circuit 1421 via the optical waveguide 1416, or to the optical waveguide. It is sent to the combining circuit 1422 via 1418. Synthesis circuit 1
The combined output optical signal of 419 is sent to the variable wavelength selecting elements 1427 and 1428 via the branching device 1423, and the combining circuit 1
The output optical signal of 420 is sent to the variable wavelength selecting elements 1429 and 1430 via the branching device 1424, and the combining circuit 142
The output optical signal of No. 1 is sent to the variable wavelength selecting elements 1431 and 1432 via the branching device 1425, and the output optical signal of the combining circuit 1422 is sent to the variable wavelength selecting element 1 via the branching device 1426.
It is sent to 433, 1434. Variable wavelength selection element 14
The output optical signals of 27 to 1434 are respectively transmitted to the optical waveguides 1435.
~ 1442 via optical buffer memory 1443-1450
Sent to.

The optical buffer memories 1443 to 1450 store the input optical signal and output the optical signal stored in the first-in / first-out operation. The optical signals output from the optical buffer memories 1443 and 1444 are combined by the combiner 1451.
The output optical signals of the optical buffer memories 1445 and 1446 are output from the optical waveguide 1456 via the combiner 1452, and the output optical signals of the optical buffer memories 1447 and 1448 are output to the optical waveguides via the combiner 1453. The optical buffer memory 1 is emitted from the 1457.
The output optical signals of 449 and 1450 are emitted from the optical waveguide 1458 via the combiner 1454.

The 2 × 4 self-routing circuit 1409 or 1410 outputs the inputted optical cell signal to the optical waveguides 1411, 1413, 1415, 1417 or 1 respectively.
Detection signals 1460, 1461 indicating which of the optical waveguides 412, 1414, 1416, 1418 has been transmitted.
Is output. The control circuit 1480 detects the detection signals 1460, 1
The control signals 1470 to 1477 of the variable wavelength selection elements 1427 to 1434 are generated according to 461. The variable wavelength selection elements 1427 and 1428 select optical signals of a predetermined wavelength from the optical signals input according to the control signals 1470 and 1471 from the control circuit 1480 and send them to the optical buffer memories 1443 and 1444. The variable wavelength selecting elements 1429 and 1430 select optical signals of a predetermined wavelength from the optical signals respectively input according to the control signals 1472 and 1473 from the control circuit 1480 and send them to the optical buffer memories 1445 and 1446. . Further, the variable wavelength selection elements 1431 and 1432 select an optical signal 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 it 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 respectively input according to the control signals 1476 and 1477 from the control circuit 1480 and send it to the optical buffer memories 1449 and 1450. . Optical buffer memory 1
Reference numerals 443, 1444 or 1445, 1446 or 1447, 1448 or 1449, 1450 store the input optical signal, and the optical signal stored in the first-in / first-out operation is merged with the combiner 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 circuit 1409, 141
8 is a timing chart for explaining the operation of 0 and the combination circuit 1419. In FIG. 15, reference numeral 1501
Is the wavelength 1 input to the distribution circuit 1403 in FIG.
One data signal, and three types of data signals D1 to D3
Are multiplexed on the time axis. Distribution circuit 1403
Input the data signals D1 to D3 and the destination information, and add the header optical signals H1 to H3 in accordance with the destination information to generate the optical cell signals 1 to 3 of the wavelength λ ₁₁ , respectively, 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 indicated by 1503. The optical self-routing circuit 1409 self-routes the data part optical signals D1 and D3 in accordance with the header part optical signals H1 and H3 of the inputted optical cell signals 1 and 3, respectively, and the data part optical signal shown in 1504, for example, to the combining circuit 1410. Sends an optical signal. In addition, the optical self-routing circuit 14
Reference numeral 10 self-routes the data optical signal D2 in accordance with the header optical signal H2 of the input optical cell signal 2 and, for example, the data optical signal 1505 is also combined circuit 1 again.
To 419. The synthesizing circuit 1419 is 1504, 15
Since the optical signals indicated by reference numeral 05 are input and combined, as indicated by reference numeral 1506, the data optical signals D1 to D3 are combined by the combining circuit 1.
It is output from 419.

As described above, in the case of FIG. 14 as well, a plurality of optical self-routing circuits are used, and 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 portion of the next optical cell signal, the effective throughput is improved.

FIG. 16 is a block diagram of the seventh embodiment of the present invention. In the figure, 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, there are two input terminals and two output terminals (2 × 2). Indicates. 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 output optical signal of the optical self-routing circuit 1603 is 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. The 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 the optical waveguides 1612, 1613
The output optical signal of the × 2 optical space switch 1609 is 1 ×
It is sent to the two optical space switches 1616 and 1617. 1
At the output terminals of the × 2 optical space switches 1614 to 1617,
Optical buffer memories 1618 and 1619, 1620 and 16
21, 1622 and 1623 and 1624 and 1625 are connected to each other.

The optical buffer memories 1618 to 1625 store incident optical signals and emit the optical signals stored in the first-in / first-out operation. The optical buffer memories 1618, 1620 and 1622, 1624 are optical buffer memories dedicated to the high priority optical cells, and the optical buffer memories 1619, 1621, 1623 and 1625 are optical buffer memories dedicated to the 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 combiner 1626, and the output optical signals of the optical buffer memories 1619 and 1621 are combined to the combiner 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 combiner 1628, and the output optical signals of the optical buffer memories 1623 and 1625 are also sent to the optical space switch 1631 via the optical space switch 1629. It Optical space switch 1630,1
Reference numeral 631 causes optical signals to be self-routed to the optical waveguides 1632 and 1633, respectively.

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

The 2 × 2 optical space switch 1608 operates in accordance with the control signal 1650 from the control circuit 1670 and the optical waveguide 1
Optical signals respectively input via 604 and 1605 are sent to the 1 × 2 optical space switch 1 via optical waveguides 1610 and 1611.
It is sent to 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 respectively 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
According to the header bit indicating the priority of each input optical signal, the optical signal is transmitted to the optical buffer memory 16 for the high priority optical cell.
18, 1620, 1622, 1624 or optical buffer memories 1619, 1621, 162 for low priority optical cells
Self route to either 3,1625. Optical buffer memories 1618 and 1620, 1619 and 162
Reference numerals 1, 1622 and 1624, 1623 and 1625 respectively store the input optical signals, and the optical signals stored in the first-in / first-out operation are combined by the combiners 1626 and 162.
7, 1628, 1629.

FIG. 17 shows a concrete structure 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 sent to the optical splitter 17
It is sent to the optical gates 1703 and 1704 via 02.
The optical signals output from the optical gates 1703 and 1704 are output from the 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. In FIG. 18, reference numeral 1801 indicates an electric pulse applied to the optical gate 1703, which is V _H during the time t _{3 to} t _{4 and} V during the time t ₄ to t ₈ .
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. Optical gate 1703, 1 of FIG.
As shown by 1803 in FIG. 18, the optical signal A incident on the 704 has a header optical signal indicating high priority only during the time t _{3 to} t ₄ , and during the time t _{6 to} t ₇ . Data part optical signal is present. Therefore, in the optical gate 1703, the time when the electric pulse is V _H and the time when the header section optical signal indicating the high priority exists, but the optical gate 1704 does not match. Therefore, the optical signal of the data portion 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 of FIG. 18, the optical signal B incident on the 1704 has a header optical signal indicating low priority only during the time t ₄ to t ₅ , and the data portion during the time t _{6 to} t _7. There is an optical signal. Therefore, in the optical gate 1704, the time when the electric pulse is V _H and the time when the header optical signal having the low priority exists are matched, but the optical gate 1703 does not match. Therefore, the optical signal of the data portion of the optical signal B passes through only the optical gate 1704 and is self-routed to the optical waveguide 1706. It should be noted that the times t _{1 to} t ₂ or t _{2 to} t ₃ of the optical signals A and B in FIG. 18 indicate the time slots to which the header optical signal for the 2 × 4 optical self-routing circuit 1603 in FIG. 16 is attached. There is.

FIG. 21 shows the optical space switch 163 shown 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 signal A,
B is incident on the optical waveguides 2100 and 2101, respectively, and is transmitted to the optical gates 2110 and 2111. Optical gate 211
The output optical signals from 0 and 2111 are combined by the optical combiner and output from the 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 of FIG. The same figure (a) shows the 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 to 2111, and the resistance 2140
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 respectively incident on the optical gates 2110 and 2111 are time t ₁ as shown in (c) and (d) of FIG.
~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 to 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 optical signals of the optical cell signals A and B exist are from time t ₁ to. coincides with t ₂ . Further, since the light quantity P ₁ of the header optical signal of the optical cell signal A is larger than the light quantity P ₂ of the header optical signal of the optical cell signal B, the optical gate 21
10 switches to an operating state in which the subsequent optical signal of the data portion is transmitted, earlier than other optical gates 2111. Light gate 2
When 110 enters this operating state, optical gate 2110
The injection current to the optical gate 2111 increases, and the voltage applied to the optical gate 2111 decreases due to the voltage drop caused by the injection current and the resistor 2140. Due to the operation of the optical gates 2110 and 2111, the optical cell signal A
Of the data portion of the data signal passes through the optical gate 2110 and is self-routed to the optical waveguide 2102 via the optical combiner 1632.

As described above, the optical switch of FIG. 21 uses the optical gate that operates preferentially according to the amount of light of the header optical signal of the optical cell signal, so that the optical cell signal between the two inputs and the one output is changed. Even if a collision occurs, one optical cell signal can be preferentially output.

FIGS. 23A to 23D are other timing charts for explaining the operation of the optical space switches 1630 and 1631 in FIG. The same figure (a) shows the 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 ) and V _L1 (V _L1 <V between time t _{3 and} t _6
L0 ) keep. As shown in (c) and (d) of the optical cell signals A and B respectively incident on the optical gates 2110 and 2111, the amount of light is P ₁ at times t _{1 to} t ₂ and t _{2 to} t ₃ , respectively. header optical signal, and the data unit optical signal at time t ₄ ~t ₅ is present. In the optical gates 1910 and 1911 to which the optical cell signals A and B are respectively incident, the header portion optical signals of the optical cell signals A and B all exist at times t _{1 to} t ₃ when the applied voltages are V _H1 . Further, the header optical signal of the optical cell signal A is faster than the optical header 211 of the optical cell signal B.
Since the light is incident on the optical gate 0, the optical gate 2110 switches faster than the other optical gates 2111 in the operating state for transmitting the data signal optical signal thereafter. When the optical gate 2110 shifts to the operating state, the injection current into 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. It is not possible to transmit the data part optical signal of By such operations of the optical gates 2110 and 2111, only the optical signal of the data portion of the optical cell signal A passes through the optical gate 2110 and is self-routed to the optical waveguide 2102 via the optical combiner 2120.

As described above, the optical space switch of FIG. 21 can also be used for 2-input 1-input by using the optical gate that operates preferentially according to the time difference attached to the header optical signal of the optical cell signal.
Even if a collision of optical cell signals occurs between outputs, one optical cell signal can be preferentially output.

As described above, in the case of FIG. 16, the number of time slots required for the header portion for self-routing is reduced, and the priority control for the optical cell signal has time slots equal to the number of priorities. By assigning the header section, priority control of outputting the optical signal from the output terminal in the order corresponding to the header section for priority control can also be performed.

FIG. 19 is a block diagram of an eighth embodiment of the present invention, showing a case where the optical cell signal has two priorities, high priority and low priority. Wavelength λ ₁ , respectively
The optical cell signals A and B of λ ₂ are transmitted to the optical waveguides 1901 and 190.
Input from 2 to the 2 × 2 optical self-routing circuit 1903. The output optical signal of the 2 × 2 optical self-routing circuit 1903 is sent to the variable wavelength selecting elements 1908 and 1909 via the optical waveguide 1904 and the branching device 1906, or the variable wavelength selecting element 1910 and the variable wavelength selecting element 1910 via the optical waveguide 1905 and the branching device 1907. It is sent to 1911. The output optical signals of the variable wavelength selection elements 1908 to 1911 pass through the optical waveguides 1912 to 1915, respectively, and the 1 × 2 optical space switch 191.
6 to 1919. 1 × 2 optical space switch 19
An optical buffer memory 1920 is provided at the output terminals of 16 to 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 optical signal stored in the first-in / first-out operation is emitted. The optical buffer memories 1920, 1922, 1924, 1926 are optical buffer memories dedicated to the high-priority optical cells, and the optical buffer memories 1921, 1923, 1925, 1927 are optical buffer memories dedicated to the low-priority optical cells. The optical signals output from the optical buffer memories 1920 and 1922 are combined by the combiner 192.
8 to the optical space switch 1932, and the output optical signals of the optical buffer memories 1921 and 1923 are combined by the combiner 19
It is also sent to the optical space switch 1932 via 29. Further, the output optical signals of the optical buffer memories 1924 and 1926 are sent to the optical space switch 1933 via the combiner 1930, and the output optical signals of the optical buffer memories 1925 and 1927 are also supplied to the optical space switch 1 via the combiner 1931.
It is sent to 933. Optical space switch 1932, 193
3 self-routes optical signals to the optical waveguides 1934 and 1935, respectively.

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

1 × 2 optical space switches 1916 to 1919
According to the header bit indicating the priority of each input optical signal, the optical signal is transmitted to the optical buffer memory 19 for the high priority optical cell.
20, 1922, 1924, 1926 or optical buffer memories 1921, 1923, 192 for low-priority optical cells
Self route to either 5, 1927.
Optical buffer memories 1920 and 1922, 1921 and 19
23, 1924 and 1926, 1925 and 1927 store the optical signals respectively input, and the optical signals stored by the first-in / first-out operation are merged with the combiners 1928-19.
31 is sent. The 2 × 2 optical self-routing circuit 1903 and the variable wavelength selection elements 1908 to 1 in FIG.
911 is a 2 × 2 optical self-routing circuit 4 in FIG.
03, and the variable wavelength selection elements 408 to 411 have the same configuration. Further, the 1 × 2 optical space switch 1916 in FIG.
~ 1919 and the optical space switches 1932, 1933
The structure is the same as that shown in FIGS. 17 and 21, respectively.

As described above, also in the case of FIG. 19, the number of time slots required for the header part for self-routing is reduced, and the priority control header part having time slots equal to the number of priorities in the optical cell signal. By assigning, the priority control in which the optical signals are output from the output terminals in the order according to the priority control header section can also be performed.

FIG. 20 is a block diagram of the ninth embodiment of the present invention, in which the optical cell signal is also given two priorities of high priority and low priority. Each wavelength λ _11, λ ₂₁ and lambda ₁₁ of optical cell signals A, 2 × C and E from the light guide 2001 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 the optical waveguide 2
004, variable wavelength selection element 201 via branching device 2008
2, 2013, or the variable wavelength selection elements 2014, 201 via the optical waveguide 2005 and the branching device 2009.
5 or optical waveguide 2006, branching device 201
It is sent to the variable wavelength selecting elements 2016 and 2017 via 0 or to the variable wavelength selecting elements 2018 and 2019 via the optical waveguide 20073 branching device 2011. Output optical signals of the variable 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. At the output ends of the 1 × 2 optical space switches 2028 to 2035, 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
Reference numerals 36 to 2051 store the input optical signal and output the optical signal stored in the first-in / first-out operation. Optical buffer memory 2036, 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, 2041 and 20.
Reference numerals 43, 2045 and 2047, 2049 and 2051 are optical buffer memories dedicated to low priority optical cells. The optical signals output from the optical buffer memories 2036 and 2038 are combined by the combiner 2052.
The optical signals output from the optical buffer memories 2037 and 2039 are transmitted to the optical space switch 2006 via the combiner 205.
3 to the optical space switch 2060. The output optical signals of the optical buffer memories 2040 and 2042 are sent to the optical space switch 2061 via the combiner 2054,
The optical signals output from the optical buffers 2041 and 2043 are combined by the combiner 2
It is sent to the optical space switch 2061 via 055. The output optical signals of the optical Huffer memories 2044 and 2046 are sent to the optical space switch 2062 via the combiner 2056,
The output optical signals of the optical buffer memories 2045 and 2047 are sent to the optical space switch 2062 via the combiner 2057. The output optical signals of the optical buffer memories 2048 and 2050 are sent to the optical space switch 2063 via the combiner 2058, and the output optical signals of the optical buffer memories 2049 and 2051 are sent to the optical space switch 2063 via the combiner 2059.
Sent to. The optical space switches 2060 to 2063 are
The optical signals are self-routed to the optical waveguides 2064 to 2067, respectively.

2 × 4 optical self-routing circuit 2003
Input optical cell signals to the optical waveguides 2004 to 200
Detection signal 20 indicating to which optical waveguide in 7
70 is sent to the control circuit 2090. Control circuit 2090
Is the variable wavelength selection element 201 according to the detection signal 2070.
2 to 2019 to generate control signals 2080 to 2087, respectively. The variable wavelength selection elements 2012 and 2013 select optical signals of a predetermined wavelength from the optical signals respectively input according to the control signals 2080 and 2081 from the control circuit 2090, and output to the 1 × 2 optical space switches 2028 and 2029. Send out. The variable wavelength selecting elements 2014 and 2015 select the optical signal of a predetermined wavelength from the optical signals respectively input according to the control signals 2082 and 2083 from the control circuit 2090, and the 1 × 2 optical space switches 2030 and 2031. Send to. Further, the variable wavelength selection elements 2016 and 2017 select the optical signal of a predetermined wavelength from the optical signals respectively input according to the control signals 2084 and 2085 from the control circuit 2090, and the 1 × 2 optical space switches 2032 and 2033.
Send to. In addition, variable wavelength selection elements 2018 and 2019
Are control signals 2086 and 2087 from the control circuit 2090.
1 × 2 optical space switches 2034, 203 are selected from the optical signals input according to
Send to 5.

1 × 2 optical space switches 2028 to 2035
Is an optical buffer memory 20 for a high priority optical cell according to a header bit indicating the priority of each 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
3, 2045, 2047, 2049, 2051 is self-routed. Optical buffer memory 203
6,2038 or 2037,2039 or 20
Reference numerals 40, 2042 or 2041, 2043 store the input optical signals, and the optical signals stored by the first-in / first-out operation are merged with each of the combiners 2052 to 2055.
Send to. Also, the optical buffer memories 2044, 2046
Or 2045, 2047 or 2048, 205
0 or 2049, 2051 stores the input optical signal, and outputs the optical signal stored by the first-in / first-out operation to the combiners 2056 to 2059, respectively.
The 2 × 4 optical self-routing circuit 20 shown in FIG.
03, the variable wavelength selection elements 2012-2019 have the same configurations as the 2 × 4 optical self-routing circuit 703 and the variable wavelength selection elements 712-719 in FIG. Furthermore, FIG.
1 × 2 optical space switches 2028 to 2035 and 1 × 2 optical space switches 2060 to 2063 are provided with the configurations shown in FIGS. 17 and 21, respectively. Note that FIG.
Since the optical space switch has the same configuration as the switch described above, description thereof will be omitted only by providing corresponding reference numerals in the drawings.

As described above, also in the case of FIG. 20, the number of time slots required for the header portion for self-routing is reduced, and the priority control header portion having time slots equal to the number of priorities in the optical cell signal is provided. By assigning, the priority control of outputting the optical signal from the output terminal in the order according to the priority control header portion can be performed together.

FIG. 24 is a block diagram of an embodiment of the tenth invention of the present invention, showing an optical self-routing circuit in the case of two input terminals and two output terminals (2.times.2) performing the optical broadcast control system. . The optical cell signal generation circuits 2420 and 2421 generate optical cell signals composed of a header portion and a data portion corresponding to a plurality of predetermined output terminals from the input data portion and broadcast control signal. The optical cell signal from the optical cell signal generation circuit 2420 input to the optical waveguide 2400 is transmitted by the optical branching device 24.
The optical cell signal from the optical signal generation circuit 2421, which is branched into two at 02, is incident on the optical gates 2404 and 2405, and is incident on the optical waveguide 2401,
The light is branched and incident on the optical gates 2400 and 2407.
The optical signals output from the optical gates 2404 and 2406 are combined by the optical combiner 2408 and emitted from the optical waveguide 2410.
The output optical signals of the optical gates 2405 and 2407 are the optical multiplexer 2
They are merged at 409 and emitted from the optical waveguide 2411. The electric pulse generation circuit 2412 includes optical gates 2404 and 240.
6 through the resistor 2413, and another electrical pulse through the resistor 2414 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. Reference numeral 2501 indicates a voltage pulse applied to the optical gates 2404 and 2406, and the time t _{1 to} t ₃ is set by the resistor 2413.
V _H less than V _H0 , T _{3 to} t ₈ to keep V _L smaller than V _L0 . 2502 indicates a voltage pulse applied to the resistor 2414, next V _H0 between times t ₃ ~t _5, t ₅ ~t
_Hold V _L0 for ₈ hours. 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 of FIG. 24 enters from the optical waveguide 2400 and is broadcast-connected to the optical waveguides 2410 and 2411. The operation in this case will be described. Optical gates 2404 and 2405 of FIG.
As shown by 2504 in FIG. 25, the optical cell signal A incident on the optical signal A has a header optical signal between times t ₁ and t ₂ and times t ₃ and t ₄ , and data at times t _{6 to} t ₇ . There is a partial optical signal. Therefore, in both the optical gates 2404 and 2405, the time of the electric pulse V _H and the time of the header optical signal coincide with each other. Therefore, the data portion of the optical cell signal A passes through both the optical gates 2404 and 2405, and passes through the optical combiners 2408 and 2409 to guide the optical waveguides 2410 and 24.
It is self-routed to both 11.

[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 It is possible to perform broadcast control with self-routing to both.

As another example of the optical broadcast control, the optical waveguides 2410 and 241 of the optical self-routing circuit shown in FIG.
1 optical cell signal generation circuit 242 to be broadcast-connected to both
The optical cell signals B and C from 0, 2421 are transmitted to the optical waveguide 24
A case will be described in which the light beams enter from 00 and 2401 at the same time. The optical cell signal B incident on the optical gates 2404 and 2405 is time t as shown by 2505 in FIG.
_The header part exists in both ₁ to t ₂ and t ₃ to t ₄ , and the data part exists in t ₆ to t ₇ . Therefore, both optical cell signals B and C may collide with each other by signals that should be broadcast to both optical waveguides 2410 and 2411, and the optical gate 240
4, 2406, and the header portion exists during the time when the voltage applied to each of the optical gates 2405 and 2407 is 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
4, 2405 quickly switches to a state in which the subsequent data portion 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 drop due to the current flowing through the resistors 2413 and 2414 lowers the applied voltage to the optical gates 2406 and 2407. Therefore, it is no longer the optical gate 2406, 2
407 cannot pass the data portion 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 combiners 2 respectively.
It is self-routed 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 broadcast control in which the optical signal is preferentially self-routed to the optical waveguides 2410 and 2411 in accordance with the order of arrival of the header section in (1).

FIG. 26 is a block diagram of the eleventh embodiment of the present invention, which illustrates a case of two input terminals and two output terminals (2.times.2) for performing the optical broadcast control system. The optical cell signals A, B and C enter the optical copy circuit 2602 from the optical waveguides 2600 and 2601, respectively. Optical copy circuit 2602
Outputs a light signal from one or both of the optical waveguides 2603 and 2604 by copying a number of light cell signals corresponding to the header portion of the light cell signal to be incident. The optical signal from the optical copy circuit 2602 is transmitted to the optical waveguides 2603, 2
It is sent to the header insertion circuits 2605 and 2606 via 604, respectively. The header inserting circuits 605 and 2606 add the necessary headers to the input optical signal by the optical self-routing circuit 2609, and then add the optical waveguides 2607 and 26, respectively.
It is sent to the optical self-routing circuit 2609 via 08. The optical self-routing circuit 2609 sends an optical signal to the optical waveguide 261 according to the header portion of the incident optical cell signal.
The light is emitted from

FIG. 27 shows an optical copy circuit 2602 shown in FIG.
It is a specific configuration diagram of. Optical waveguide 260 in FIG. 27
0, 2601, 2603 and 2604 respectively correspond to the optical waveguides having the same reference numerals shown in FIG. The optical buffer memories 2700 and 2701 are the optical waveguides 260, respectively.
A header part and a data part having a number of header signals equal to the number of output terminals to be broadcasted, that is, the number of copies of the optical signal, from the broadcast control signal input on a separate line from the data part input from 0, 2601. The optical splitter 2 is generated by the first-in / first-out operation via the optical waveguides 2702 and 2703 after generating the optical cell signal composed of
704, 2705. The optical cell signals branched into two by the optical branching device 2704 are incident on the optical gates 2706 and 2707, and the optical cell signals branched into two by the optical branching device 2705 are incident on the gates 2708 and 2709. Light gate 27
The output optical signals of 06 and 2708 are combined by the optical combiner 2710 and emitted from the optical waveguide 2603. Optical gate 270
The output optical signals of 7, 2709 are combined by the optical combiner 2711 and emitted from the optical waveguide 2704. The electric pulse generation circuit 2712 connects the optical gates 2706 and 2708 with a resistor 271.
3 through the same electrical pulse, also optical gate 270
Another electric pulse is applied and supplied to No. 7, 2709 via the resistor 2714.

FIG. 28 is a timing chart for explaining the operation of the optical copy circuit of FIG. Reference numeral 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. Reference numeral 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 _VL smaller than _L0 .

As an example of the operation of the optical copy circuit 2602, two data parts of the optical cell signal A from the optical buffer memory 2700 of FIG.
The case of emitting light from 604 will be described. The optical cell signal A incident on the optical gates 2706 and 2707 from the optical buffer memory 2700 has a header optical signal between time t ₁ and t ₂ and time t ₃ and t ₄ , as indicated by 2804 in FIG. and, the data unit optical signal is present at time t ₆ ~t _7. Therefore, in both the optical gates 2706 and 2707, the time when the electric pulse V _H and the time when the header optical signal exists 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 combiners 2710 and 2711 to guide the optical waveguides 2603 and 2604.
Is 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 in FIG. 27 to the optical waveguides 2702 and 2703 will be described. Optical gate 2706
The optical cell signal B incident on the 2707 has a header portion at both times t ₁ to t ₂ and t ₃ to t ₄ , and a data portion at t _{6 to} t ₇ , as shown at 2805. Optical gate 270
As shown in 2806, the optical cell signal C incident on the optical cell 8 and 2709 has a header portion at both times t ₂ to t ₃ and t ₄ to t ₅ , and a data portion at t _{6 to} t ₇ . Therefore, the optical cell signals B and C are both applied to the optical gates 2706 and 2708 and the optical gates 2707 and 2709 by V _H.
Since there is a header part within the time, the number of copies is 4 because it is a cell signal that wants to copy each data part two by two, 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.
There is a possibility of colliding with each other at 3,2604. However, the header portion of the optical cell signal B comes first in the optical gates 2706, 2
Since it is incident on 707, the optical gates 2706 and 2707
Quickly switches to a state where the subsequent data section is passed.
When the optical gates 2706 and 2707 shift to this state,
The injection current to the optical gates 2706 and 2707 increases, and the voltage drop due to the passage of this current through the resistors 413 and 414 lowers the applied voltage to the optical gates 2708 and 2709. Therefore, the optical gates 2708 and 2709 are no longer the optical cell signals. The data part of C cannot be passed. As a result, only the data portion of the optical cell signal B is transferred to the optical gates 2706, 2
After passing through 707, it is self-routed to both of the optical waveguides 2603 and 2604 via the optical combiners 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 part, when the requested number of copies exceeds the maximum number of copies, 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 which has been copied by a predetermined number in the optical copy circuit 2602 of FIG.
5, 2606 is added with a header indicating a predetermined output terminal to be transmitted, and the optical self-routing circuit 2609 is added.
Sent to. As a specific configuration of the optical self-routing circuit 2609, the one-to-one correspondence shown in FIG.
The same configuration as the connectable conventional optical self-routing circuit is applicable.

By thus connecting the optical copy circuits in cascade before the optical self-routing circuit capable of one-to-one connection, it is possible to perform the optical broadcast control according to the header portion of the optical cell signal. .

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

[0106]

As described above, according to the present invention, an optical signal can be sent to a predetermined output terminal according to the header portion of an optical cell signal, and the number of time slots in the header portion required for self-routing Can be reduced, so that the throughput of the effective data part 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 the optical cell signals are prioritized, the optical signals can be output in order according to the priority.

Further, according to the present invention, in the optical self-routing circuit, it is possible to place the header portion of the cell signal in the time slot corresponding to a plurality of predetermined output terminals to perform the broadcast control of the optical signal. Further, an optical copy circuit for copying an optical signal having a copy number equal to the number of headers of the optical cell signal and an optical copy circuit for self-routing to a predetermined output terminal in a one-to-one correspondence with the header portion of the optical cell signal. Optical broadcast control is possible by connecting in series with a self-routing circuit.

[Brief description of drawings]

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

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

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

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

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

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

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

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

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

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

FIG. 11 is a timing chart showing the operations of the distribution circuit, the 2 × 4 optical self-routing circuit, and the combining circuit in FIG.

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

FIG. 13 is a timing chart showing the operations of the distribution circuit, 2 × 2 optical self-routing circuit, and combination 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 operations of the distribution circuit, 2 × 4 optical self-routing circuit, and combination circuit in FIG.

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

17 is a block diagram of the 1 × 2 optical space switch in FIG.

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

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

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

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

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

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

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

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

FIG. 26 is a configuration diagram of an eleventh invention example of the present invention.

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

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

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

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

31 is a structural diagram of an optical gate used in the 2 × 2 optical self-routing circuit of 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, 104-107, 110-113, 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 brancher 205-208 Optical gate 213 Electric pulse generation circuit 220 to 223 Resistor 230 to 233 Detector 401, 402, 404, 405, 412 to 415, 4
22,423 Optical waveguide 403 2 × 2 optical self-routing circuit 406,407 Brancher 408-411 Variable wavelength selection element 416-419 Optical buffer memory 420,421 Merger 430 Detection signal 431-434 Control signal 440 Control circuit 503,504 Optical splitter 505-508 Optical gate 509,510 Combiner 513 Electric pulse generation circuit 520,523 Resistance 530-533 Detector 540-543 Detection signal 701,702,704-707,726-727,7
40-743 Optical waveguide 703 2x2 optical self-routing circuit 708-711 Brancher 712-719 Variable wavelength selection element 728-735 Optical buffer memory 736-739 Combiner 750 Detection signal 751-758 Control signal 760 Control circuit 803,804 Optical brancher 805-812 Optical gate 813-816 Combiner 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 Distribution circuit 1009, 1010 2 × 4 optical self-routing circuit 1019-1022 Synthesis circuit 1027, 1028 2 × 2 Optical space switch 1033-1036 Optical buffer memory 1037, 1038 Merger 1050, 1051 Detection signal 1060, 1061 Control signal 1070 Control circuit 1201, 1202, 1205-1208, 1211
1214, 1223 to 1226, 1233, 1234
Optical waveguide 1203, 1204 Distribution circuit 1209, 1210 2 × 2 optical self-routing circuit 1215-1216 Combining circuit 1217, 1218 Branch device 1219-1222 Variable wavelength selection element 1227-1230 Optical buffer memory 1231, 1232 Merger 1240, 1241 Detection signal 1250 to 1253 Control signal 1260 Control circuit 1401, 1402, 1405 to 1408, 1411
1418, 1535 to 1442, 1455 to 1458
Optical waveguide 1403, 1404 Distribution circuit 1409, 1410 2x2 optical self-routing circuit 1419-1422 Combined circuit 1423-1426 Brancher 1427-1434 Variable wavelength selection element 1443- 1450 Optical buffer memory 1451-1454 Combiner 1460, 1461 Detection signal 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 space switch 1614-1617 1 × 2 optical space switch 1618-1625 Optical buffer memory 1630, 1631 Merger 1640 Detection signal 1650, 1651 Control signal 1670 Control circuit 1701, 1702, 1705, 1706 Optical waveguide 1702 Optical branching device 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 Brancher 1908-1911 Variable wavelength selection element 1916-1919 1 × 2 optical space switch 1920-1927 Optical buffer memory 1928-1931 Merger 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 Brancher 2012 to 2019 Variable wavelength selection element 2028 to 2035 1 × 2 optical space switch 2036 to 2051 Optical buffer memory 2052 to 2059 Merger 2060 to 2063 Optical space switch 2070 Detection signal 2080-2087 Control signal 2090 Control circuit 2100, 2101, 1022 Optical waveguide 2110, 2111 Optical gate 2120 Combiner 2130 Resistor 2400, 2401, 410, 2411 Optical waveguide 2402, 2403 Optical brancher 2404-2407 Optical Gate 2408, 2409 Combiner 2412 Electric pulse generation circuit 2413, 2414 Resistor 2420, 2421 Photocell 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 branching device 2706-2709 Optical gate 2710, 2711 Merger 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 branching device 3005-3008 Optical gate 3009, 3010 Optical combiner 3013 Electric pulse generating circuit 3020, 3021 Resistor 3100 Input optical signal 3110 Optical guide layer 3120, 3130 End face 3140 Electrode 3150 Output optical signal

Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI Technical indication location H04Q 3/52 101 Z 9076-5K 11/04 8220-5K H04B 9/00 E 9076-5K H04Q 11/04 R

Claims (11)

[Claims] 1. 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, wherein: N second input terminals connected to the input terminals, a second output terminal, and m output terminal groups corresponding to the respective first output terminals, each of the output terminal groups Has n third output terminals, and outputs an optical signal input to the second input terminal to the predetermined third output terminal according to header information.
Output terminal of the optical signal is self-routed, the optical signal is self-routed to the third output terminal, and the detection signal indicating which third output terminal the optical signal is self-routed to the second output. An n-input, (n × m) -output optical self-routing circuit for outputting to a terminal, a control circuit for outputting a control signal according to the detection signal from the second output terminal, and n third inputs A terminal, a fourth input terminal, and n fourth output terminals, and n third output terminals of each of the output terminal groups.
Output terminals of n are respectively connected to the n third input terminals, and the optical signal is output to a predetermined fourth input terminal according to the control signal input to the fourth input terminal. N optical input switches having n inputs and n outputs, and n optical output switches of each of the m optical space switches are connected to store and output the optical signal (n × m). Optical buffer memories, and m n combiners for combining and outputting the optical signals from the n optical buffer memories connected to each of the n output terminals of each of the m optical space switches. An optical ATM switch comprising: 2. 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 wavelengths different from each other are fixedly determined as the wavelengths of the optical signals incident from the respective input terminals, and n second input terminals connected to the first input terminal are connected. And a second output terminal and m third output terminals corresponding to the respective first output terminals, and the optical signal input to the second input terminal is output according to header information. N input for outputting a detection signal indicating to which of the third output terminals the wavelength-multiplexed optical signal is self-routed by wavelength-multiplexing to a predetermined third output terminal and outputting to the second output terminal. , M output optical self-routing circuit, and the second output terminal And a control circuit for outputting a control signal according to the detection signal, and m for branching the wavelength-multiplexed optical signal, which are respectively connected to the m third output terminals of the optical self-routing circuit.
N branching devices, n corresponding to each of the m third output terminals of the optical self-routing circuit, a third input terminal, a fourth input terminal, and a fourth input terminal are provided. Output terminals, each of the m number of n-branches is connected to the third input terminal, and the wavelength-multiplexed optical signal is output from the wavelength-multiplexed optical signal according to the control signal input to the fourth input terminal. (N × m) variable wavelength selection elements for selecting an optical signal having a predetermined wavelength and outputting the selected optical signal to the fourth output terminal, and m third output terminals of the optical self-routing circuit, respectively. Correspondingly provided n each, connected to each of the fourth output terminals of each of the (n × m) variable wavelength selection elements, storing and outputting the optical signal of the predetermined wavelength (n × m). m) optical buffer memories, and the m first optical self-routing circuits Optical ATM switch, characterized in that it comprises a m n-converging device to said optical signal merged output from said n light buffer memory provided corresponding to respective output terminals of. 3. In 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 having different wavelengths from each other. G wavelength groups each consisting of n optical signals and having different wavelength bands to which the n optical signals belong, and g from each of the n first input terminals.
From each of the wavelength groups, g optical signals having wavelengths different from each other, which are assigned in advance one wavelength each, are incident one by one, and n second input terminals connected to the first output terminal, and Two output terminals and m third output terminals corresponding to each of the first output terminals. The optical signal input to the second input terminal is provided with header information and the optical signal. According to the wavelength, wavelength-multiplexed every g wavelength groups to a predetermined third output terminal for self-routing, and a detection signal indicating to which third output terminal the wavelength-multiplexed optical signal is self-routed An n-input, m-output optical self-routing circuit for outputting to the second output terminal; a control circuit for outputting a control signal according to the detection signal from the second output terminal; m Are respectively connected to the serial third output terminal branches the wavelength-multiplexed optical signal m
N branching devices, n corresponding to each of the m third output terminals of the optical self-routing circuit, a third input terminal, a fourth input terminal, and a fourth output are provided. Each of the m number of n branching devices has a terminal, is connected to the third input terminal, and outputs a predetermined signal from the wavelength-multiplexed optical signal according to the control signal input to the fourth input terminal. Corresponding to each of the (n × m) variable wavelength selection elements that select an optical signal of a wavelength and output it to the fourth output terminal, and the m third output terminals of the optical self-routing circuit. N variable wavelength selecting elements are connected to each of the fourth output terminals, and the optical signal of the predetermined wavelength is stored and output (n × m). ) Optical buffer memories, and the m third optical buffer circuits of the optical self-routing circuit. Optical ATM switch, characterized in that it comprises a m n-converging device to converge the light signal from the n-number of the light buffer memory provided in correspondence with each of the force pin output. 4. 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, wherein: A second input terminal connected to the terminal, k
(K is an integer of 2 or more) number of second output terminals, and n number of optical signals input to the second input terminal are sequentially output to the k number of second output terminals. A distribution circuit; n third input terminals each connected to one of the k second output terminals of each of the n distribution circuits; a third output terminal; Light having m output terminal groups corresponding to the respective first output terminals, each of the output terminal groups having n fourth output terminals, and being input to the third input terminal. A signal is self-routed to a predetermined fourth output terminal according to header information, and a detection signal indicating to which fourth output terminal the optical signal is self-routed is output to the third output terminal. k n inputs, (n × m) output optical self-routing circuit, and k fourth inputs A terminal and a fifth output terminal, and each one of the n fourth output terminals of each of the k optical self-routing circuits is connected to the k fourth input terminal. And (n × m) combining circuits that sequentially output the optical signals input to the k fourth input terminals to the fifth output terminal, and the optical output signals from the third output terminal. A control circuit that outputs a control signal according to a detection signal is connected to the n fifth output terminals of the n synthesis circuits to which the n fourth output terminals of each output terminal group are connected. N fifth input terminals, a sixth input terminal, and
m n inputs having n sixth output terminals and outputting the optical signal to a predetermined sixth output terminal in response to 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 to store and output the optical signal. , M n combiners for combining and outputting the optical signals from the n optical buffer memories connected to each of the n sixth output terminals of each of the m optical space switches. Optical ATM switch characterized in that 5. 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, wherein The wavelengths of the optical signals incident from the respective one input terminals are fixed at n different wavelengths, and the second input terminal connected to the first input terminal and k (K is an integer of 2 or more) number of second output terminals, and n number of optical signals input to the second input terminal are sequentially output to the k number of second output terminals. A distribution circuit, and n third input terminals to which one of the k second output terminals of each of the n distribution circuits is connected,
A third output terminal and m fourth output terminals corresponding to each of the first output terminals are provided, and an optical signal input to the third input terminal is predetermined according to header information. The fourth
Wavelength-multiplexed and self-routed to the output terminal of the device, and outputs to the third output terminal a detection signal indicating to which of the fourth output terminals the wavelength-multiplexed optical signal is self-routed. An optical self-routing circuit, k fourth input terminals, and a fifth output terminal, each one of the m fourth output terminals of each of the k optical self-routing circuits. Each of the k fourth input terminals is connected to the k fourth input terminal, and the wavelength-multiplexed optical signal connected to the k fourth input terminals is sequentially M combining circuits for outputting to a fifth output terminal, and m branching devices each connected to the fifth output terminal of each of the m combining circuits and branching the wavelength division multiplexed optical signal. , Control according to the detection signal from the third output terminal A control circuit for outputting a signal, and n number of the fourth output terminals corresponding to the m fourth output terminals of the optical self-routing circuit, a fifth input terminal, a sixth input terminal, and Each of the m number of n branching devices having six output terminals is connected to the fifth input terminal, and the wavelength division multiplexed optical signal is output in accordance with the control signal input to the sixth input terminal. Each of the (n × m) variable wavelength selection elements for selecting an optical signal of a predetermined wavelength from the optical output and outputting it to the sixth output terminal, and the m fourth output terminals of the optical self-routing circuit. In accordance with the above, and is connected to each of the sixth output terminals of each of the (n × m) variable wavelength selection elements, and stores and outputs the predetermined wavelength optical signal (n × m). m) optical buffer memories, and m self-routing circuits An optical ATM, which is provided with m number of n combiners for combining and outputting the optical signals from the n number of the optical buffer memories provided corresponding to each of the fourth output terminals. switch. 6. In 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 having different wavelengths from each other. G wavelength groups each consisting of n optical signals and having different wavelength bands to which the n optical signals belong, and g from each of the n first input terminals.
From each of the wavelength groups, g optical signals having wavelengths different from each other, which are assigned in advance one wavelength each, are incident one by one, and n second input terminals connected to the first output 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 distribution circuits for outputting to the second output terminals in order, and n number of n-th distribution circuits to which one of the k second output terminals of each of the n distribution circuits is connected. 3 input terminals,
A third output terminal and m fourth output terminals corresponding to each of the first output terminals are provided, and the optical signal input to the third input terminal includes header information and the optical signal. Detection signal indicating to which of the fourth output terminals the wavelength-multiplexed optical signal is self-routed by wavelength-multiplexing every g wavelength groups to a predetermined fourth output terminal according to the wavelength of To the third output terminal, k optical input routing circuits of n inputs and m outputs, k fourth input terminals, and a fifth output terminal. Each one of the m fourth output terminals of the routing circuit is connected to the k fourth input terminals, and the wavelength division multiplexed optical signal is connected to the k fourth input terminals Are output to the fifth output terminal in order. A path, m n branching devices connected to the fifth output terminals of each of the m combining circuits and branching the wavelength division multiplexed optical signal, and the detection signal from the third output terminal. A control circuit for outputting a control signal in accordance with the above, and n number of n corresponding to each of the m number of the fourth output terminals of the optical self-routing circuit, a fifth input terminal and a sixth input terminal. And a sixth output terminal, each of the m number of n branching devices is connected to the fifth input terminal, respectively, and the wavelength is changed according to the control signal input to the sixth input terminal. (N × m) variable wavelength selection elements for selecting an optical signal of a predetermined wavelength from the multiplexed optical signal and outputting the selected optical signal to the sixth output terminal, and m fourth output of the optical self-routing circuit. N terminals are provided for each of the terminals, and (n × m) terminals are provided. (N × m) optical buffer memories connected to each of the sixth output terminals of each wavelength selection element to store and output the optical signal of the predetermined wavelength; and m optical buffer circuits of the optical self-routing circuit. An optical ATM comprising: n optical multiplexers provided corresponding to each of the fourth output terminals; and n optical multiplexers that combine and output the optical signals from the optical buffer memories. switch. 7. 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, wherein: N second input terminals connected to the terminals, a second output terminal, and m output terminal groups corresponding to each of the first output terminals, each of the output terminal groups n optical output signals input to the second input terminal are self-routed to the predetermined third output terminal according to the first header information. A detection signal indicating which of the third output terminals is self-routed is output to the second output terminal n
An input (n × m) output optical self-routing circuit, a control circuit that outputs a control signal in response to the detection signal from the second output terminal, n third input terminals, and a fourth An input terminal and n fourth output terminals, each of which has n third output terminals.
Output terminals of n are respectively connected to the n third input terminals, and the optical signal is output to a predetermined fourth output terminal according to the control signal input to the fourth input terminal. First n-input, n-output first optical space switches, a first n-th fifth input terminal connected to the fourth output terminal, and a prioritized sequential pre-attached to the optical signal. It has p (p is an integer of 2 or more) fifth output terminals equal to the number, and the optical signal input to the fifth input terminal is given a predetermined fifth signal according to second header information. (N × m) second optical space switches for self-routing to output terminals, and (n × m) second optical space switches connected to the p fifth output terminals of each of the second optical space switches. , P optical buffer memories for storing and outputting the optical signals corresponding to the priorities (n m) pieces of the optical buffer memory group, said first optical space switch of the n first 4 n number of said fifth input terminal corresponding is connected to the output terminal of the second
(P × m) first n combiners for combining and outputting the optical signals of the same priority from the optical buffer memory group corresponding to each of the optical space switches, and the first optical space. From the p number of the optical signals from the first n merger corresponding to the switch, one signal is preferentially output according to the third header information. An optical ATM switch having an optical space switch. 8. 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, wherein the n first ATM terminals are provided. The wavelengths of the optical signals incident from the respective input terminals of n are fixedly set to n different wavelengths, and n wavelengths of the second input terminals connected to the first input terminal are , A second output terminal and m third output terminals corresponding to the first output terminals, respectively, and the optical signal input to the second input terminal is converted into first header information. Wavelength-division-multiplexed optical signal to the predetermined third output terminal for self-routing according to
An optical self-routing circuit of n-input and m-output for outputting to the second output terminal a detection signal indicating whether self-routing is performed to the output terminal of the control signal, and a control signal according to the detection signal from the second output terminal. A control circuit for outputting the signal, and m n branching devices connected to the m third output terminals for branching the wavelength-multiplexed optical signal, and m corresponding to the third output terminals, respectively. And n are provided each having a third input terminal, a fourth input terminal, and a fourth output terminal, and each of the outputs of the m number of n-branches in the previous period is the third input terminal. The optical signal of the predetermined wavelength is selected from the wavelength-multiplexed optical signal according to the control signal input to the fourth input terminal and is output to the fourth output terminal (n × m). Number of variable wavelength selection elements and connected to the fourth output terminal An input terminal 5 is equal to the number of previously assigned priority order to the optical signal p (p
Is an integer greater than or equal to 2) number of fifth output terminals,
(N × m) first space switches for self-routing the optical signal input to the input terminal of the optical signal to the predetermined fifth output terminal according to the second header information, and (n × m) (N × m) optical buffer memories connected to the p fifth output terminals of each of the optical space switches and storing and outputting the optical signals corresponding to the priority order. And the fifth input terminal is connected to the fourth output terminal of each of the variable wavelength selection elements provided in n corresponding to each of the third output terminals. Corresponding to (p × m) n combiners for combining and outputting the optical signals of the same priority from the optical buffer memory group corresponding to each of the optical space switches, and the third output terminal. From the p optical signals from the n combiner Preferentially 1 in accordance with the header information
An optical AT, which is provided with m p-input and 1-output second optical space switches for outputting one optical signal.
M switch. 9. In 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 having different wavelengths from each other. G wavelength groups each consisting of n optical signals and having different wavelength bands to which the n optical signals belong, and g from each of the n first input terminals.
From each of the wavelength groups, g optical signals having wavelengths different from each other, which are assigned in advance one wavelength each, are incident one by one, and n second input terminals connected to the first output terminal, and Two output terminals and m third output terminals corresponding to each of the first output terminals, and the optical signal input to the second input terminal is converted into the first header information and the The wavelength-multiplexed optical signal is self-routed by wavelength-multiplexing every g wavelength groups to a predetermined third output terminal according to the wavelength of the optical signal, and to which of the third output terminals the wavelength-multiplexed optical signal is self-routed. An n-input, m-output optical self-routing circuit that outputs a detection signal to the second output terminal; a control circuit that outputs a control signal in response to the detection signal from the second output terminal; Routing circuit M n-branches connected to the respective third output terminals for branching the wavelength-division-multiplexed optical signal, and m corresponding to each of the m third output terminals of the optical self-routing circuit. N units each having a third input terminal, a fourth input terminal, and a fourth output terminal.
Each of the n branching devices is connected to the third input terminal, and selects 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) variable 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. Equal to the number of p (p
Is an integer greater than or equal to 2) number of fifth output terminals,
(N × m) first optical space switches for self-routing the optical signal input to the input terminal of the optical fiber to the predetermined fifth output terminal according to the second header information; ) Each of the optical space switches comprises p optical buffer memories connected to the p fifth output terminals and storing and outputting the optical signals corresponding to the priority order (n × m) The fifth input terminal is connected to the fourth output terminal of each of the variable wavelength selection elements, each of which is provided with n pieces of optical buffer memory groups and n pieces corresponding to each of the third output terminals. The optical signals of the same priority from the optical buffer memory group corresponding to each of the n optical space switches are merged and output (p × m).
1 from the n optical couplers and the p optical signals from the optical multiplexers corresponding to the third output terminals, according to the third header information.
An optical AT, which is provided with m p-input and 1-output second optical space switches for outputting one optical signal.
M switch. 10. 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 is provided, and the optical self-routing circuit is provided. , An optical gate that transmits the data portion of the optical cell signal only when a header signal and an electrical signal of the optical cell signal are simultaneously applied, and is provided corresponding to each of the m output terminals. The data part is self-routed to the predetermined output terminal in accordance with the header signals placed in the m time slots, and the data part is self-routed to the predetermined output terminals of the m time slots. An optical ATM switch, characterized in that the optical header signals are placed in a plurality of time slots. 11. An optical cell signal is generated from a data portion and a broadcast control signal which are connected to the n (n is an integer of 2 or more) first input terminals one by one, and the optical cell signal is stored and then emitted. N optical buffer memories and one of the n optical buffer memories are connected to each of the n second input terminals, and a header signal and an electric signal of an optical cell signal are simultaneously applied. And a first part of the optical cell signal, which is composed of an optical gate that transmits a data portion of the optical cell signal.
Number of optical signals equal to the number of header signals of
Is an integer greater than or equal to 2) and has the first optical self-routing circuit for self-routing to the first output terminals, and the n first input terminals and the m first output terminals. An optical copy circuit and m header insertion circuits each connected to each of m output terminals of the optical copy circuit and adding a second header signal for self-routing to an incident optical signal. And having m third input terminals and m second output terminals,
Each of the m header insertion circuits is connected to each of the m third input terminals and placed in m time slots provided corresponding to each of the m second output terminals. An optical self-routing circuit for self-routing the optical signal to a predetermined second output terminal according to the generated second header signal, wherein the optical copy circuit has a first header included in the optical cell signal. A number of data sections equal to the number of signals are generated, and each of the m header insertion circuits has a second section in each of the data sections generated by the optical copy circuit.
The optical ATM switch, wherein the optical self-routing circuit self-routes the data section to a predetermined second output terminal according to the second header signal.