JP2924887B1 - Optical communication network node - Google Patents

Abstract

An optical communication network node that can reduce the number of unnecessary cross points in an optical switch network is provided. Each of the wavelength-division multiplexed input optical transmission paths (100-1 to 100-M) is line-switched by the optical switch network (140) as long as the optical signal is passed through the buffered wavelength-division multiplexing reception interfaces (120-1 to 120-M). The wavelength is converted by the optical wavelength multiplexing transmission interfaces 121-1 to 121-M and output to the wavelength multiplexing output optical transmission line 110-1 or the buffer and the optical switch network 1 of the buffered wavelength multiplexing reception interface are provided.
At 40, the signals are exchanged by ATM, and a plurality of optical signals are multiplexed and output to the wavelength multiplexed output optical transmission path 110-1. Input transmission line 16
The optical signals from 0-1 to L are connected to the buffers of the buffered reception interfaces 122-1 to 12-L and the optical switch network 14 respectively.
At 1 the ATM is exchanged and output to the output transmission lines 170-1 to 170-L.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical communication network node integrating an asynchronous transfer mode (ATM) technology and an optical wavelength multiplexing technology.

[0002]

2. Description of the Related Art In recent years, along with the improvement of transmission bandwidth due to the progress of optical fiber transmission technology, broadband ISDN (hereinafter referred to as BISDN) which accommodates various communication services such as voice, data and image in an integrated manner and provides it to subscribers. Expectations are growing. ARM technology is an essential network technology for realizing this BISDN. ATM is
For example, the document “TM-LAN” (written by Hiroshi Shimizu and Hiroshi Suzuki,
As described in the Soft Research Center, all information is divided into fixed-length packets called cells,
Information is transmitted and exchanged by adding a header necessary for routing. In this case, the cell is transmitted to a target ATM node or terminal by two kinds of logical connections of a virtual circuit and a virtual path.

As an optical switch applied to this ATM, for example, Japanese Patent Application Laid-Open No. H06-164628 discloses that
An optical ATM switch that performs switching according to a header portion of an optical cell signal is disclosed. In addition, special opening and closing 04-124
Japanese Patent Application Publication No. 994 discloses a cascade connection between wavelength conversion switches in a wavelength division multi-stage optical switch network constituted by cascading wavelength conversion switches for converting the wavelength of an optical input signal in which a plurality of wavelengths of light are multiplexed into an arbitrary wavelength. It is disclosed that the connection is made by an optical coupler. Further, Japanese Unexamined Patent Application Publication
Japanese Patent Application Laid-Open No. 219793 discloses a wavelength division switch which exchanges signals by wavelength division multiplexing signals and exchanging wavelengths. It should be noted that JP-A-06-3
No. 03656 discloses a matrix optical switch connected to each path in which optical transmission paths are bundled to eliminate unnecessary input / output terminals due to insertion of an optical splitter and an optical multiplexer to perform an efficient actual phase. It is disclosed.

On the other hand, an AT based on such a cell
The signal transmission between the M transmission / switching devices is performed by converting a high-speed cell into an optical signal and transmitting the signal due to the development of optical fiber communication technology. Furthermore, in recent years, in order to further increase the capacity of a network, a plurality of optical wavelengths are multiplexed and transmitted in one optical fiber transmission line, and the communication node transmits the optical signal to another predetermined node as it is. An optical communication network node (hereinafter, referred to as a node) in which a switching wavelength division multiplexing type optical cross-connect device and an ATM device are combined has been studied.

Conventionally, as such a node, 1997
Proceedings of the IEICE Communication Society Conference (Makoto Nishio, Naoya Hemi, Proposal for ATM OVER WDM Multilayer Node, B-6-2, P.2, 1997). FIG. 16 is a diagram illustrating such a node.
In the following description, for convenience, sending a signal from an optical communication network composed of nodes to another local network or regional network accommodated by the own node is referred to as signal branching. Is transmitted to the optical communication network is referred to as signal insertion, and the transfer of an optical signal from an adjacent node in the optical communication network to another node is referred to as signal passing.

Optical signals of n different wavelengths (λ1 to λn)
Are multiplexed and generated by the wavelength multiplexing input optical transmission line 3300-X (X = 1-M).
Long multiplex receiving interface with buffer 3320-X
(X = 1 to M). Each of the buffered wavelength division multiplexing reception interfaces 3320-X (X = 1 to M)
Input port 3330- (Xn-n + 1)-3330-
X · n (X = 1 to M) by n optical switch networks 3
2340.

Each of the buffered wavelength division multiplexing receiving interfaces 3320-X (X = 1 to M) separates the input wavelength division multiplexed optical signal into optical signals of n wavelengths, and then demultiplexes these n optical signals. Input port 3330- (X
• n−n + 1) to 3330−X · n (X = 1 to M) to the optical switch network 3340. Alternatively, the buffered wavelength division multiplexing reception interface 3320-X (X
= 1 to M), after demultiplexing the input wavelength multiplexed optical signal into optical signals of n wavelengths, extracting an ARM cell from the transmission frame for each of the n optical signals, and inputting the ARM cell via a buffer. Ports 3330- (Xn-n + 1) to 3330
−X · n (X = 1 to M) to optical switch network 3340
The optical cell is sent out.

On the other hand, the receiving interface 3322-Y
(Y = 1 to L) are input optical transmission lines 3350-Y
After receiving the optical signal from (Y = 1 to L), the ATM cell is extracted from the transmission frame, and the light is transmitted from the input port 3331-Y (Y = 1 to L) to the optical switch network 3340 via the buffer provided therein. Send the cell. When an optical signal is inputted without passing through a buffer in the buffered wavelength division multiplexing receiving interface 3320-X (X = 1 to M), the optical switch network 340 outputs a predetermined output port 3332-1 to 3332-1 to 340x. Switch the optical signal to 3332-M · n in a circuit-switched manner.

The optical switch network 3340 includes a buffered wavelength division multiplexing reception interface 3320-X (X
= 1 to M), the optical cell is input via the buffer.
Buffered wavelength multiplex receiving interface 320-X
(X = 1 to M) and a predetermined output port 3 according to a switching control signal notified by a control line (not shown).
32-1 to 3332-M · n and 3333-Y (Y = 1 to
Switch to L) for each cell. Further, the optical switch network 3340 includes a buffered reception interface 33.
When an optical cell is input from 22-Y (Y = 1 to L), the buffered receiving interface 3322-y (y = 1 to L)
L) according to the header of the cell notified by a control line (not shown).
332-M · n and 3333-Y (Y = 1 to L) are switched for each cell.

[0010] WDM transmission interface 3321-X
(X = 1 to M) is also the output port 332−
(X · n−n + 1) to 3332 −X · n (X = 1 to M)
Are connected to the optical switch network 3340 in units of n. WDM transmission interface 3321-X (X = 1
To M) are output ports 3332- (Xn−n +
1) When optical signals switched circuit-switched from the optical switch network 3340 via 3332-X · n (X = 1 to M) are input, these are converted into optical signals of n wavelengths. A wavelength-division multiplexed optical signal generated by combining these signals is sent to a wavelength-division multiplexed output optical transmission line 3310-X (X = 1 to M).

The wavelength division multiplexing transmission interface 332
Each of 1-X (X = 1 to M) is an output port 3332-
(X · n−n + 1) to 3332 −X · n (X = 1 to M)
When an optical cell switched for each cell is input from the optical switch network 3340 via the optical switch network 3340, these are inserted into the transmission frame every n and converted into optical signals of n wavelengths.
A wavelength-division multiplexed optical signal generated by combining these signals is transmitted to a wavelength-division multiplexed output optical transmission line 3310-X (X = 1 to M). On the other hand, when each of the transmission interfaces 3323-Y (Y = 1 to L) receives an optical cell switched for each cell from the optical switch network 3340 via the output port 3333-Y (Y = 1 to L), After inserting the cell into the transmission frame, the cell is converted into an optical signal, and the output optical transmission line 3360-Y (Y = 1
To L).

Next, the optical switch network 3340 shown in FIG.
17 is shown in FIG. Optical switch network 340
0 is the input port 3330-X (X = 1 to M) in FIG.
And 3331-Y (Y = 1 to L) are input terminals 341
0-1 to 3410-N · n (where N · n = M · n +
L), and the output port 3332-X (X =
1 to M) and 3333-Y (Y = 1 to L) are output terminals 3460-1 to 3460-N · n (where N · n =
M · n + L). The optical switch network 3400 includes N optical sub-switch modules 3401.
-K (K = 1 to N), each of which includes n wavelength converters 4420, one star coupler, n N-input optical switches 3440, and n variable wavelength filters 3450.
It is composed of

The wavelength converter 3420- (Sn-n + 1)
To 3420-S · n (S = 1 to N) are input terminals 3
410- (Sn-n + 1) to 3410-Sn (S =
1 to N) are converted into optical signals of wavelength ΛZ (Z = 1 to n) and sent to the star coupler 430-S (S = 1 to N). Here, the wavelength ΛZ (Z = 1 to n) is the wavelength λZ on the wavelength multiplexed input / output optical transmission lines 3300 and 3310 in FIG.
(Z = 1 to n) may be the same or different. Each of the star couplers 3430-S (S = 1 to N) has an input terminal 410- (Sn-n + 1) to 3410-
After wavelength multiplexing the optical signals from S · n (S = 1 to N), the wavelength multiplexed signal is converted to optical switches 3440-1 to 3440.
Branch to -N · n.

Optical switches 3440-1 to 3440-N.
n is a variable wavelength filter 3 that selects one of the N wavelength multiplexed signals from the star coupler 3430-S (S = 1 to N).
Branch to 450-1 to 3450-N · n. The optical switches 3440-1 to 3440-N · n are connected to the star coupler 34.
N-wavelength multiplexed signals from 30-S (S = 1 to N) are
One of the variable wavelength filters 3450-1 to 3450-
N · n. Tunable wavelength filters 3450-1 to 3450-1
450-N · n selects an optical signal of a desired wavelength from the input wavelength-division multiplexed signal and outputs the output terminals 3460-1 to 346.
0-N · n.

The optical switches 3440-1 to 344 in FIG.
0-N · n and variable wavelength filters 3450-1 to 34
50-N · n are input terminals 3410-1 to 3410-N
In the case of switching the optical signal input from n in a circuit switching manner, a predetermined line is set between the input terminals 3410-1 to 3410-N · n and the output terminals 3460-1 to 3460-N · n. Is controlled. Such a line setting is semi-fixedly performed by a network management system, or is realized on demand using a connection control protocol started between nodes. Alternatively, the optical switch 3440-1
3440-N · n and variable wavelength filter 3450-
1-3450-N · n are input terminals 3410-1 through 34
When switching the optical signal input from 10-N · n for each cell, switching control according to the header of the cell processed by the buffered wavelength division multiplexing interface 3320-X (X = 1 to M) in FIG. The optical signal is switched for each cell by the signal.

As described above, an arbitrary input terminal 34 is provided by the optical switch network 3400 having the configuration shown in FIG.
The optical signals input from 10-1 to 3410-M · n are
Cell switching or circuit switching can be performed for any of the output terminals 3460-1 to 3460-N · n. Further, FIG.
The optical switch network No. 7 can be expanded or reduced in units of optical sub-switch modules 3401-K (K = 1 to N) with the addition or reduction of n input terminals 3410 and output terminals 3460. is there. For example, FIG.
Each time one wavelength multiplexing input optical transmission line 3300-X (X = 1 to M) and one wavelength multiplexing output optical transmission line 3310-X (X = 1 to M) are added, one optical sub-switch module 3401 is added. It will be expanded.

The details of the optical switch network shown in FIG. 17 are described in the literature (Nishio, Suzuki, "Study of wavelength division / space division hybrid optical network", IEICE Exchange Research Group, SSE92-148, PP .31-36,199
2. ). The detailed configurations of the buffered long multiplex reception interface 3320 and wavelength multiplex transmission interface 321 of FIG. 16 are shown in FIGS. FIG.
As shown in FIG. 8, the wavelength-division-multiplexed receiving interface 3500 with the buffer
00-X (X = 1 to M) and the input terminal 3510 are connected, and the input port 3330− of the optical switch network 3340 is connected.
(X · n−n + 1) to 3330−X · n (X = 1 to M)
Are connected to output terminals 3511-Z (Z = 1 to n).

The wavelength division multiplexer 3520 has an input terminal 35
The wavelength division multiplexed signal from 10 is split into optical signals of n wavelengths, and each is sent to an optical switch 3530-Z (Z = 1 to n). When the optical switch 3530-Z (Z = 1 to n) causes an input optical signal to be switched by the optical switch network 3340, the optical switch 3540-Z, the cell extracting circuit 3550-Z, and the buffer 3560- Z, routing table 3570-Z, electro-optical converter 33580-Z
In order to make (Z = 1 to n) a shortcut, switch to the optical combiner 3590-Z (Z = 1 to n). Or,
The optical switch 3530-Z (Z = 1 to n) converts the input optical signal into a buffer 3560-Z (Z = 1 to n) and the buffer shown in FIG.
When the ATM is exchanged with the optical switch network 3340 of FIG.
Switch to n).

Photoelectric converter 3540-Z (Z = 1 to n)
Converts the optical signal of each predetermined wavelength from the wavelength demultiplexer 3520 into an electric signal once and outputs it to the cell extracting circuit 3550-Z (Z = 1 to n). Each of the cell extracting circuits 3550-Z (Z = 1 to n) receives an electric signal from the photoelectric converter 3540-Z (Z = 1 to n), extracts cells from the transmission frame, and stores the cells in the buffer 3560-. Z (Z = 1 to n). Buffer 3560-Z (Z = 1 to n) temporarily stores input cells and sends the cells to routing table 3570-Z (Z = 1 to n) in a first-in / first-out manner, for example.

The routing table 3570-Z (Z =
1 to n) analyze the header of the cell from the buffer 3560-Z (Z = 1 to n) and output ports 3332-1 to 3332-M.
n or 333-Y (Y = 1 to L) is determined, the header is rewritten to a predetermined value, and the electro-optical converter 3580-Z (Z
= 1 to n). Further, the routing table 35
70-Z (Z = 1 to n) is an optical switch network 3340
In order to control switching between the optical switches 3440-1 to 3440-N · n and the variable wavelength filters 3450-1 to 3450-N · n, the output port of the optical cell is notified to the optical switch network 3340. Electro-optical converter 3580-Z (Z
= 1 to n) are routing tables 3570-Z, respectively.
The cells from (Z = 1 to n) are converted into optical cells and sent to the optical combiner 3590-Z (Z = 1 to n).

The optical combiner 3590-Z (Z = 1 to n)
The optical signal from the optical switch 3530-Z (Z = 1 to n) or the optical signal from the electro-optical converter 3580-Z (Z = 1 to n) is output to the output terminal 3511-Z (Z = 1 to n). Send out. In this way, the buffered long multiplex reception interface 3500 outputs the n optical signals multiplexed to the wavelength multiplexed signal from the input terminal 3510 as output signals 3511-Z (Z = 1 to Z) without passing through the buffer. n) or after each conversion to an electrical signal, cells can be taken out of the transmission frame and temporarily stored in a buffer before being output to output terminals 3511-Z (Z = 1 to n).

On the other hand, as shown in FIG. 19, the wavelength multiplexing transmission interface 3501 is connected to the optical switch network 3 of FIG.
340 output ports 3332- (Xn-n + 1) to 3
Each of 332-X · n (X = 1 to M) is an input terminal 351
2-Z (Z = 1 to n), and the wavelength multiplexed output optical transmission line 3310-X (X = 1 to M) and the output terminal 3513 are connected. Optical switch 3521-Z (Z = 1 to n)
When the input optical signal is switched by the optical switch network 3340, the wavelength converter 35
Switch to 71-Z.

Each of the wavelength converters 3571-Z (Z = 1 to n) converts an optical signal from the optical switch into an optical signal having a predetermined wavelength λZ (Z = 1 to n).
Wavelength multiplexer 3581 via 561-Z (Z = 1 to n)
Output to Alternatively, the optical switch 3521-Z (Z =
1 to n) indicate that the input optical signal is a buffer 3560-Z (Z =
1 to n) and the optical switching circuit 3340, the optical signal is converted into a photoelectric signal by the photoelectric converter 3531-Z.
(Z = 1 to n).

The photoelectric converter 3531-Z (Z = 1 to n)
Converts an input optical cell into an electric signal and sends it to a cell insertion circuit 3541-Z (Z = 1 to n). Cell insertion circuit 35
41-Z (Z = 1 to n) are each a photoelectric converter 3531
-Z (Z = 1 to n) are input, these are inserted into the transmission frame, and the electro-optical converter 3551-Z (Z =
1 to n). Electro-optical converter 3551-Z (Z = 1 to
n) converts the electric signals from the cell insertion circuits 3541-Z (Z = 1 to n) into optical signals of predetermined wavelengths λ1 to λn, respectively, and converts them into optical combiners 3561-Z (Z = 1 to
Output to the wavelength multiplexer 3581 via n).

The wavelength multiplexing device 3581 is provided for the electro-optical converter 3
A signal of n wavelengths from 551-Z (Z = 1 to n) or an optical signal from wavelength converter 3571-Z (Z = 1 to n) is multiplexed, and a wavelength multiplexed signal is output to output terminal 3513. Send out. Thus, the wavelength multiplex transmission interface 3
501 converts the optical signal from the input terminal 3512-Z (Z = 1 to n) into an electric signal and then inserts each cell into a transmission frame to convert the cell into an optical signal of predetermined n wavelengths; Alternatively, the input terminals 512-Z (Z = 1 to
n) is converted into an optical signal having a predetermined number of n wavelengths as it is, and the wavelength multiplexed signal is converted to an output terminal 35.
13 is output.

Next, the detailed configurations of the buffered reception interface 3322 and transmission interface 3323 in FIG. 16 are shown in FIGS. As shown in FIG. 20, the receiving interface with buffer 3600 includes an input optical transmission line 3350-Y (Y = 1 to L) and an input terminal 361 shown in FIG.
0 is connected, and each of the input ports 331-Y (Y = 1 to L) of the optical switch network 3340 is connected to the output terminal 3670.

The photoelectric converter 3620 includes an input terminal 361
In order for the optical signal from 0 to be exchanged with the buffer 3640 and the optical switch network 3340 by ATM, the optical signal is once converted into an electric signal and output to the cell extracting circuit 3630. The cell take-out circuit 3630 includes the photoelectric converter 3
An electric signal from 620 is input, a cell is extracted from the transmission frame, and the cell is transmitted to the buffer 3640. Buffer 3640 temporarily stores the input cells and sends the cells to routing table 3650 in a first-in / first-out manner, for example.

The routing table 3650 analyzes the header of the cell from the buffer 3640, and outputs the output ports 3332-1 to 3332-1 to 333-2 of the optical switch 340 to be output.
332-M · n or 3333-Y (Y = 1 to L) is determined, the header is rewritten to a predetermined value, and the electro-optical converter 3
Send to 660. Further, the routing table 3650
Is the optical switch 3440 in the optical switch network 3340
−1 to 3440−N · n and variable wavelength filter 3450−
The output port of the optical cell is notified to the optical switch network 3340 for switching control of 1 to 3450-N · n.

The electro-optical converter 3660 converts the cell from the routing table 3650 into an optical cell and sends it to the output terminal 3670. In this way, the receiving interface with buffer 3600 converts the optical signal from the input terminal 3610 into an electric signal before inputting the signal to the buffer,
Cells can be taken out of the transmission frame, temporarily stored in a buffer, and then output to the output terminal 3670.

On the other hand, as shown in FIG. 21, the transmission interface 3601 is connected to the optical switch network 3340 of FIG.
Output ports 3333-Y (Y = 1 to L) are connected to the input terminal 3611, and the output optical transmission path 3360-Y
(Y = 1 to L) and the output terminal 651 are connected. The photoelectric converter 3621 converts an optical signal from the input terminal 3611 into an electric signal, and sends the electric signal to the cell insertion circuit 3631. The cell insertion circuit 3631 receives the cells from the photoelectric converter 3621, inserts the cells into the transmission frame, and sends them to the photoelectric converter 3641.

The electro-optical converter 3641 includes a cell insertion circuit 36
The electric signal from the terminal 31 is converted into an optical signal, and the output terminal 36
51. Thus, the transmission interface 3
601 converts the optical signal from the input terminal 3611 into an electric signal, then inserts each cell into the transmission frame, and outputs the optical signal to the output terminal 3651. As explained above,
A conventional optical communication network node, the configuration of which is shown in FIG.
= 1 to M), the cell multiplexed with the optical signal of an arbitrary wavelength transmitted to an arbitrary output optical transmission line 3360-Y (Y = 1 to M).
L).

The conventional node converts a cell from an arbitrary input optical transmission line 3350-Y (Y = 1 to L) into an optical signal of an arbitrary wavelength, and converts the cell into a wavelength multiplexed output optical transmission line 3310-Y.
X (X = 1 to M). Further, the conventional node is provided with an arbitrary wavelength multiplexed input optical transmission line 3300-
By converting an optical signal of an arbitrary wavelength of X (X = 1 to M) into an optical signal of an arbitrary wavelength of an arbitrary wavelength multiplexed output optical transmission line 3310-X (X = 1 to M), wavelength multiplexing is performed. Optical signals can be passed between output optical transmission lines.

[0033]

The conventional optical communication node can realize connection functions of dropping / inserting, passing, and returning signals. However, in the conventional optical communication network node, the connection functions of dropping / inserting, passing, and returning signals are all realized by using one optical switch network. In the case where only the passage of an optical signal is realized, (M · n +
L) Hardware corresponding to the number of cross points of 2 is required. Therefore, a large-scale optical switch network is required, and it is difficult to reduce the size and cost of the node.

Also, in the conventional optical communication network node, since it is realized by using one large-scale optical switch network switch, the internal optical branch loss is large, and therefore, the optical loss due to the optical switch circuit is reduced. There is a problem of becoming larger.

The present invention has been made to solve the above-mentioned conventional problems, and is equivalent to a space division equivalent circuit to reduce the number of unnecessary cross points in an optical switch network, and to reduce the number of unnecessary cross points in an optical switch network. It is an object of the present invention to provide a low-loss optical communication network node in which hardware can be reduced, the device can be reduced in size, and the loss can be reduced.

[0036]

To achieve the above object, the first invention has both an ATM switching function for exchanging ATM cells in an optical communication network node and an optical switching function for exchanging optical signals as light. An optical communication network node having one input terminal and a plurality of output terminals, and transmitting a wavelength multiplexed optical signal incident from the one input terminal through each of a plurality of first input optical transmission lines with different wavelengths. After demultiplexing into a plurality of optical signals, the plurality of optical signals are output as light from each of the plurality of output terminals, or the plurality of optical signals are converted into electric signals and extracted from a transmission frame. A plurality of buffers for temporarily storing cells in a buffer, processing the header of the ATM cell output from the buffer, converting the ATM cell into an optical signal, and outputting the optical signal from each of the plurality of output terminals. A wavelength multiplexing receiving interface, 1
A signal having one input terminal and one output terminal, which is obtained by converting an optical signal incident from the input terminal through each of the plurality of second input transmission lines into an electric signal and extracting the electric signal from the transmission frame.
A plurality of buffered receiving interfaces for storing TM cells in a temporary buffer, processing an ATM cell header output from the buffer, converting the ATM cells into an optical signal, and outputting the optical signal from the output end; Having an output end, converting each of the optical signals on the optical line incident from the plurality of input ends into an optical signal of a predetermined wavelength as light, or converting each of the optical signals from the plurality of input ends The ATM cell converted into an electric signal and extracted is stored in a transmission frame, then converted into an optical signal having the predetermined wavelength, and the plurality of optical signals converted into the predetermined wavelength are multiplexed to form a wavelength multiplexed optical signal. A plurality of wavelength-division multiplexing transmission interfaces for emitting from the one output end and transmitting to a plurality of first output transmission lines;
AT which has one input terminal and one output terminal, and converts each optical signal incident from the input terminal into an electric signal and extracts it
A plurality of transmission interfaces for storing M cells in a transmission frame, converting them into optical signals, emitting the signals from the output end, and transmitting the signals to a plurality of second output optical transmission lines; An output terminal has a plurality of input terminals and a plurality of output terminals respectively connected thereto, and the predetermined optical line is set between the plurality of predetermined input terminals and the output terminal, or the plurality of buffers are provided. A first optical switch network for exchanging optical signals for each cell under the control of the wavelength division multiplexing reception interface; a plurality of input terminals and a plurality of output terminals respectively connected to respective output terminals of the plurality of buffered reception interfaces; A second optical switch network for exchanging optical signals for each cell under the control of the plurality of buffered receiving interfaces; and the first and second optical switches. A plurality of input terminals and a plurality of output terminals, each having a plurality of input terminals connected thereto, and a plurality of input terminals of the plurality of wavelength-division multiplexing transmission interfaces and the plurality of transmission interfaces, wherein optical signals from the plurality of input terminals are predetermined. And an optical distribution switch network for switching to the output terminal connected to the input terminal.

The second invention is an AT for exchanging ATM cells.
An optical communication network node having both an M switching function and an optical switching function of exchanging optical signals as light, having one input terminal and a plurality of output terminals, and each of a plurality of first input optical transmission lines After demultiplexing the wavelength multiplexed optical signal incident from the one input terminal into a plurality of optical signals having different wavelengths, the plurality of optical signals are emitted as light from each of the plurality of output terminals, or The plurality of optical signals are converted into electric signals, ATM cells extracted from the transmission frame are temporarily stored in a buffer, the header of the ATM cells output from the buffer is processed, then converted into an optical signal, and the plurality of output signals are converted. A plurality of buffered wavelength-division multiplexing receiving interfaces for emitting light from each of the ends, one input end and one output end, and the input through each of a plurality of second input optical transmission lines. The ATM cell extracted from the transmission frame optical signal incident into an electric signal accumulated in the temporary buffer from, ATM output from the buffer
A plurality of buffered receiving interfaces for converting a cell header into an optical signal and outputting it from the output end, a plurality of input ends and one output end, and light incident from the plurality of input ends; Each of the optical signals on the line is converted to an optical signal of a predetermined wavelength as it is, or each of the optical signals from the plurality of input terminals is converted to an electric signal and an ATM cell extracted and stored in a transmission frame. Later, the optical signal is converted into the optical signal of the predetermined wavelength, the plurality of optical signals converted to the predetermined wavelength are multiplexed, and a wavelength-division multiplexed optical signal is emitted from the one output end to output a plurality of first output lights. A plurality of wavelength multiplexing transmission interfaces for transmitting to a transmission line, one input terminal and one
A plurality of output terminals, each of which converts an optical signal incident from the input terminal into an electric signal, stores the extracted ATM cell in a transmission frame, converts the ATM cell into an optical signal, emits the same from the output terminal, and outputs a plurality of ATM cells. A plurality of transmission interfaces for transmitting to the second output optical transmission line, a plurality of input terminals and a plurality of output terminals, the plurality of buffered wavelength division multiplexing reception interfaces and the plurality of buffered reception interface output terminals; First and second optical selection switch networks for selectively branching optical signals from the plurality of input terminals respectively connected to the plurality of input terminals to one or more predetermined output terminals; A plurality of input terminals connected to the output terminal of the selection switch network and one output terminal, and a predetermined optical line is set between the plurality of predetermined input terminals and one output terminal; Or a plurality of first optical switches for exchanging optical signals for each cell under control from the plurality of buffered wavelength division multiplexing reception interfaces, and a plurality of first optical switches connected to output terminals of the second optical selective switch network. A plurality of second optical switches having an input terminal and one output terminal for exchanging optical signals for each cell under the control of the plurality of buffered receiving interfaces, and outputs of the first and second output switches; A plurality of input terminals connected to the terminals and a plurality of the input terminals have an input terminal of the wavelength multiplexing transmission interface and an output terminal connected to the input terminal of the transmission interface, and optical signals from the plurality of input terminals are predetermined. And an optical distribution switch network for switching to the output terminal.

A third invention is an AT for exchanging ATM cells.
An optical communication network node having both an M switching function and an optical switching function of exchanging optical signals as light, having one input terminal and a plurality of output terminals, and each of a plurality of first input optical transmission lines After demultiplexing the wavelength multiplexed optical signal incident from the one input terminal into a plurality of optical signals having different wavelengths, the plurality of optical signals are emitted as light from each of the plurality of output terminals, or The plurality of optical signals are converted into electric signals, ATM cells extracted from the transmission frame are temporarily stored in a buffer, the header of the ATM cells output from the buffer is processed, then converted into an optical signal, and the plurality of output signals are converted. A plurality of buffered wavelength-division multiplexing receiving interfaces for emitting light from each of the ends, one input end and one output end, and the input through each of a plurality of second input optical transmission lines. The ATM cell extracted from the transmission frame optical signal incident into an electric signal accumulated in the temporary buffer from, ATM output from the buffer
A plurality of buffered receiving interfaces for converting a cell header into an optical signal and outputting it from the output end, a plurality of input ends and one output end, and light incident from the plurality of input ends; Each of the optical signals on the line is converted to an optical signal of a predetermined wavelength as it is, or each of the optical signals from the plurality of input terminals is converted to an electric signal and an ATM cell extracted and stored in a transmission frame. Later, the optical signal is converted into the optical signal of the predetermined wavelength, the plurality of optical signals converted to the predetermined wavelength are multiplexed, and a wavelength-division multiplexed optical signal is emitted from the one output end to output a plurality of first output lights. A plurality of wavelength multiplexing transmission interfaces for transmitting to a transmission line, one input terminal and one
A plurality of output terminals, each of which converts an optical signal incident from the input terminal into an electric signal, stores the extracted ATM cell in a transmission frame, converts the ATM cell into an optical signal, emits the signal from the output terminal, and outputs the ATM signal from the output terminal. A plurality of transmission interfaces for transmitting to the second output optical transmission line, a plurality of input terminals, and a plurality of output terminals connected to the respective output terminals of the wavelength multiplexing reception interface, the plurality of predetermined input terminals; A first optical unit for setting the optical line predetermined between output terminals or exchanging an optical signal for each cell under the control of the plurality of buffered wavelength division multiplexing receiving interfaces and the plurality of buffered receiving interfaces; A switch network;
An optical signal having a plurality of input terminals and a plurality of output terminals connected to each output terminal of the transmission interface, and an optical signal for each cell under control from the plurality of buffered wavelength division multiplexing reception interfaces and the plurality of buffered reception interfaces. A second optical switch network, a plurality of input terminals connected to each output terminal of the buffered wavelength division multiplexing interface, each output terminal of the buffered multiplex interface, and the first optical switch network. And a plurality of output terminals connected to an input terminal of the second optical switch network, and an optical distribution switch circuit for switching an optical signal from the plurality of input terminals to the predetermined output terminal. And a network.

A fourth invention is an AT for exchanging ATM cells.
An optical communication network node having both an M switching function and an optical switching function of exchanging optical signals as light, having one input terminal and a plurality of output terminals, and each of a plurality of first input optical transmission lines After demultiplexing the wavelength multiplexed optical signal incident from the one input terminal into a plurality of optical signals having different wavelengths, the plurality of optical signals are emitted as light from each of the plurality of output terminals, or The plurality of optical signals are converted into electric signals, ATM cells extracted from the transmission frame are temporarily stored in a buffer, the header of the ATM cells output from the buffer is processed, then converted into an optical signal, and the plurality of output signals are converted. A plurality of buffered wavelength-division multiplexing receiving interfaces for emitting light from each of the ends, one input end and one output end, and input from the input end through a plurality of second input optical transmission lines; The ATM cell extracted from the transmission frame is stored in a temporary buffer, the header of the ATM cell output from the buffer is processed, and then converted to an optical signal and output from the output terminal. It has a plurality of receiving interfaces with buffers, a plurality of input terminals and one output terminal, and converts each optical signal on the optical line incident from the plurality of input terminals into an optical signal of a predetermined wavelength as light. Alternatively, each of the optical signals from the plurality of input terminals is converted into an electric signal, the extracted ATM cell is stored in a transmission frame, and then converted to the optical signal of the predetermined wavelength, and converted to the predetermined wavelength. A plurality of wavelength multiplexing transmission interfaces for multiplexing the plurality of optical signals and outputting a wavelength multiplexed optical signal from the one output terminal to the plurality of first output optical transmission lines; An ATM cell having an end and one output end, converting each optical signal incident from the input end into an electric signal, storing the extracted ATM cell in a transmission frame, converting the ATM cell into an optical signal, and outputting the ATM cell from the output end. A plurality of transmission interfaces for transmitting to a plurality of second output optical transmission lines, a plurality of input terminals and a plurality of output terminals, and one or more predetermined optical signals from the plurality of input terminals. First and second optical selective switch networks selectively branching to the output terminal, a plurality of input terminals connected to each output terminal of the first optical selective switch network, and the wavelength multiplexing transmission interfaces Having one output terminal connected to each input terminal, and setting a predetermined optical line between the plurality of predetermined input terminals and one output terminal, or setting the plurality of buffered wavelength division multiplexing reception Interface and A plurality of first optical switches for exchanging optical signals for each cell under the control of the plurality of buffered receiving interfaces, and a plurality of input terminals connected to output terminals of the second optical selective switch network; A plurality of second optical switches each having one output end and exchanging an optical signal for each cell under the control of the plurality of buffered wavelength division multiplex receiving interfaces and the plurality of buffered reception interfaces; and the buffered wavelength division multiplexing. A plurality of input terminals connected to each output terminal of the receiving interface, and a plurality of output terminals connected to each input terminal of the first optical selective switch network and the second optical selective switch network; An optical distribution switch network for switching optical signals from the plurality of input terminals to the predetermined output terminal.

The fifth invention relates to an AT for exchanging ATM cells.
An optical communication network node having both an M switching function and an optical switching function of exchanging an optical signal as light, having one input terminal, a plurality of first output terminals, and a plurality of second output terminals, After demultiplexing a wavelength-division multiplexed optical signal input from each of the input terminals through each of the plurality of first input optical transmission lines into a plurality of optical signals having different wavelengths, the plurality of optical signals are converted to a plurality of optical signals as light. Output from each of the first output terminals, or convert the plurality of optical signals into electric signals, and store the ATM cells extracted from the transmission frame in a temporary buffer, and temporarily store the ATM cells output from the buffer. And a plurality of buffered wavelength division multiplexing receiving interfaces for converting the optical signals into optical signals and emitting the signals from each of the plurality of second output terminals, and one input terminal and one output terminal. The ATM cell extracted from the second transmission frame optical signal incident into an electric signal through the respective input optical transmission path stored in the temporary buffer,
A plurality of buffered receiving interfaces for converting an ATM cell header output from the buffer into an optical signal after being processed and outputting the same from the output terminal; a plurality of first input terminals and a plurality of second input terminals; An optical terminal having one output terminal, and converting each of the optical signals incident on the optical circuit from the plurality of first input terminals into an optical signal of a predetermined wavelength as light, or Each of the optical signals from the ends is converted into an electric signal, and the extracted ATM cell is stored in a transmission frame, then converted into an optical signal having the predetermined wavelength, and the plurality of optical signals converted into the predetermined wavelength are combined. A plurality of wavelength-division multiplexing transmission interfaces for outputting a wavelength-division multiplexed optical signal from the one output terminal to a plurality of first output optical transmission lines; one input terminal and one output terminal; Each optical signal incident from ATM taken out and converted into the gas signal
A plurality of transmission interfaces for converting the cells into optical signals after storing the cells in a transmission frame and outputting the converted signals from the output terminal to a plurality of first output optical transmission lines; and a first output terminal of the buffered wavelength division multiplex reception interface. A plurality of input terminals connected thereto and an output terminal connected to the input terminals of the plurality of wavelength division multiplexing transmission interfaces, wherein the predetermined optical line is set between the plurality of predetermined input terminals and the plurality of output terminals; A first optical switch network, a plurality of input terminals to which a second output terminal of the buffered wavelength division multiplex receiving interface is connected, and a plurality of input terminals connected to the input terminal of the transmission interface via an optical coupler. A second optical switch network having an output end and exchanging optical signals for each cell under control from the plurality of buffered wavelength division multiplexing receiving interfaces;
A plurality of input terminals connected to the output terminals of the plurality of buffered reception interfaces via an optical spectroscope, and a plurality of output terminals connected to the input terminals of the transmission interface via the optical coupler; A third optical switch network for exchanging an optical signal for each cell under the control of the plurality of buffered receiving interfaces, and a plurality of optical switches connected to the output terminals of the plurality of buffered receiving interfaces via the optical spectroscope; And a plurality of output terminals connected to respective second input terminals of the plurality of wavelength division multiplexing transmission interfaces, and an optical signal is exchanged for each cell under control from the plurality of buffered reception interfaces. And 4 optical switch circuits.

According to the optical communication network node of the first invention, when a wavelength-division multiplexed optical signal is input to a plurality of buffered wavelength-division multiplexed interfaces through a plurality of first input optical transmission lines, the wavelength-division multiplexed optical signal is Is divided into a plurality of optical signals having different wavelengths and then output to the first optical switch circuit network as an optical signal, or the ATM cell extracted from the transmission frame by converting the wavelength multiplexed optical signal into an electrical signal is temporarily stored. After the header of the ATM cell output from the buffer is processed, the signal is converted into an optical signal and output to the first optical switch network. When an optical signal enters a plurality of buffered receiving interfaces through a plurality of second input optical transmission lines, the buffered receiving interface converts the optical signal into an electric signal and extracts an ATM cell extracted from a transmission frame. The data is temporarily stored in a buffer, and after processing the header of the ATM cell taken out of the buffer, it is converted into an optical signal and output to the second optical switch circuit. In the first optical switch network, a predetermined optical line is set between a predetermined input terminal and a predetermined output terminal, or an optical signal is switched for each cell under the control of a buffered wavelength multiplexing interface. And exits to the optical distribution switch network. In the second optical switch network, optical signals are exchanged for each cell under the control of a plurality of receiving interfaces with buffers, and output to the optical distribution switch network. The optical distribution switch network switches and distributes an optical signal incident from the first optical switch network and the second optical switch network to a plurality of predetermined wavelength multiplexing transmission interfaces and a plurality of transmission interfaces. In the plurality of wavelength multiplexing transmission interfaces, the incident optical signal is converted as it is at a predetermined wavelength and emitted to a plurality of first output optical transmission lines, or the incident optical signal is converted into an electric signal by converting the incident optical signal into an electric signal. After storing the extracted ATM cell in the transmission frame, the ATM cell is converted into an optical signal of a predetermined wavelength, and the converted optical signals are multiplexed and output to a plurality of first output optical transmission lines. Further, in the plurality of transmission interfaces, the optical signal incident from the optical distribution switch network is converted into an electric signal, and the extracted ATM cell is stored in a transmission frame, and then converted into an optical signal to convert the plurality of second output light. Emitted to the transmission path.

According to the optical communication network node of the second invention, the wavelength-division multiplexed optical signal is input to the buffered wavelength-division multiplexed reception interface through the first input optical transmission line. After the optical signal is branched, the optical signal is output as it is, or the optical signal is converted into an electric signal, taken out from the transmission frame, the ATM cells are temporarily stored in a buffer, and the header of the ATM cell output from the buffer is processed. Later, the optical signal is converted into an optical signal and output, and this optical signal is selectively branched to an output terminal by a first optical selective switch network and sent out to a first optical switch. Under the control of the determined optical line or the buffered wavelength division multiplex receiving interface, optical signals are exchanged for each cell and output to the optical distribution switch network. On the other hand, when an optical signal is incident on the buffered receiving interface through the second input optical transmission line, the ATM cell is converted into an electric signal, the ATM cell extracted from the transmission frame is temporarily stored in the buffer, and then the header of the ATM cell extracted from the buffer. Is converted to an electric signal, then converted to an optical signal again, and output to the second optical selection switch network. The second optical selective switch network selectively outputs the optical signal to a predetermined output terminal and sends it to the second optical switch.
The optical switch exchanges this optical signal for each cell and outputs the signal to the optical distribution switch network. The optical distribution switch network distributes the optical signals from the first and second optical switches to the wavelength division multiplex transmission interface and the transmission interface. The wavelength multiplexing transmission interface converts an optical signal into an optical signal of a predetermined wavelength or converts the
After the M cell is stored in the transmission frame, it is converted into an optical signal of a predetermined wavelength, and the converted optical signal is multiplexed and output to the wavelength multiplex output transmission path. The transmission interface converts the input optical signal into an electric signal, stores the extracted ATM cells in a transmission frame, converts the ATM cell into an optical signal, and outputs the optical signal to the second output transmission path.

Further, according to the optical communication network node of the third invention, after the optical signal incident through the first input optical transmission line is demultiplexed into a plurality of optical signals having different wavelengths by the buffered wavelength division multiplex receiving interface. After outputting the optical signal as it is, or temporarily converting it into an electric signal and temporarily storing the ATM cell extracted from the transmission frame in a buffer, processing the header of the ATM cell extracted from the buffer, and then converting it into an optical signal. The signal is converted and output to the optical distribution switch network. In the receiving interface with a buffer, when an optical signal is input through the second input optical transmission line, the optical signal is converted into an electric signal, and the header of the ATM cell extracted from the transmission frame is processed and converted into an electric signal. Output to the optical distribution switch network. The optical distribution switch network switches the optical signals input from the buffered wavelength multiplex reception interface and the buffered reception interface to predetermined first and second optical switch networks for transmission, and transmits the first and second optical switch networks. The optical switch network exchanges optical signals for each cell and outputs them to the wavelength multiplexing transmission interface and transmission interface by setting a predetermined optical line or controlling the buffered wavelength division multiplexing reception interface and buffered reception interface. I do. The wavelength multiplexing transmission interface converts an optical signal into an optical signal of a predetermined wavelength, or converts each of the optical signals into an electrical signal, stores the extracted ATM cell in a transmission frame, and then converts the ATM cell into an optical signal of a predetermined wavelength. A plurality of optical signals are multiplexed and the wavelength multiplexed optical signal is transmitted to a wavelength multiplexed output optical transmission line. The transmission interface converts an optical signal from the second optical switch network into an electric signal, stores the extracted ATM cell in a transmission frame, converts the ATM cell into an optical signal, and transmits the optical signal to an output optical transmission line.

According to the optical communication network node of the fourth invention, the wavelength-division multiplexed optical signal received through the first input transmission line and input to the wavelength-division multiplexed receiving interface with a buffer is split into a plurality of optical signals having different wavelengths. After outputting the optical signal as it is or converting the optical signal into an electric signal and temporarily storing the ATM cells extracted from the transmission frame in a buffer and processing the ATM cell header output from the buffer, The signal is converted into an optical signal and output to the optical distribution switch network. An optical signal incident on the buffered receiving interface through the second input optical transmission line is converted into an electric signal, the header of the ATM cell extracted from the transmission frame is processed, and then converted into an optical signal to convert the optical signal into an optical signal. Output to The optical distribution switch network switches and distributes the optical signals input from the buffered wavelength division multiplexing reception interface and the buffered reception interface to predetermined first and second optical selective switch networks. The optical signal is selected by the optical selection switch network and output to the first optical switch and the second optical switch, respectively. The first optical switch and the second optical switch set a predetermined optical line, or exchange optical signals for each cell under the control of the buffered wavelength division multiplexing reception interface and the buffered reception interface to perform wavelength division multiplexing transmission. Transmit with interface and transmission interface. The wavelength division multiplexing transmission interface converts the optical signal input from the first optical switch into an optical signal of a predetermined wavelength, or converts each of the optical signals into an electric signal and stores the extracted ATM cell in a transmission frame. After conversion to a predetermined wavelength, the optical signal is output to a wavelength multiplexed output optical transmission path. The transmission interface converts the optical signal input from the second optical switch into an electric signal, stores the extracted ATM cell in a transmission frame, converts the ATM cell into an optical signal, and converts the ATM cell into an optical signal.
To the output light transmission path.

According to the optical communication network node of the fifth invention, the wavelength division multiplexed optical signal incident on the buffered wavelength division multiplex receiving interface through the first input optical transmission line is demultiplexed into a plurality of optical signals having different wavelengths. Outputting the plurality of optical signals from the first output terminal to the first optical switch network, or converting the plurality of optical signals into electrical signals and storing ATM cells extracted from the transmission frame in a temporary buffer; After processing the header of the ATM cell output from the buffer, the signal is converted into a light signal and output from the second output terminal to the second optical switch network. When an optical signal enters the buffered receiving interface through the second input optical transmission path, the optical signal is converted into an electric signal, and the ATM cells extracted from the transmission frame are temporarily stored in the buffer, and extracted from the buffer. After processing the header of the ATM cell, the signal is converted into a light signal and output to the third and fourth optical switch networks through the optical splitter. In the first optical switch network, a predetermined optical line is set and an optical signal incident from the buffered wavelength division multiplex receiving interface is transmitted to the wavelength division multiplex transmission interface. The optical signal emitted from the buffered receiving interface is input to the fourth optical switch network via the optical splitter, and is exchanged for each cell in the fourth optical switch network, and is emitted from the wavelength multiplexing transmission interface. The wavelength multiplexing transmission interface converts the optical signal from the first optical switch network into an optical signal of a predetermined wavelength,
After converting the optical signal from the fourth optical switch network into an electric signal and storing the extracted ATM cell in the transmission frame, the optical signal converted to a predetermined wavelength is multiplexed to convert the wavelength multiplexed signal into the first output light. Transmit to the transmission path. In addition, an optical signal incident on the second optical switch network from the second output terminal of the buffered wavelength division multiplexing receiving interface is exchanged for each cell and incident on the transmission interface via the optical coupler, and the optical splitter is switched on. The optical signal incident on the third optical switch network from the buffered receiving interface via the buffer is exchanged for each cell, and is combined with the optical signal from the second optical switch network by the optical coupler and incident on the transmission interface. I do. In the transmission interface, the input optical signal is converted into an electric signal, and the extracted ATM cell is stored in a transmission frame, converted into an optical signal, and emitted to the second output optical transmission line.

[0046]

Next, an embodiment of an optical communication network node according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the first embodiment according to the present invention. In FIG. 1, a plurality of input optical transmission lines 100-X (X = 1
To M) are connected to the respective input terminals of a plurality of buffered wavelength division multiplexing reception interfaces 120-X (X = 1 to M). Further, a plurality of input optical transmission lines 160-Y (Y
= 1 to L) are connected to the respective input terminals of the plurality of buffered reception interfaces 120-X (X = 1 to M).

The plurality of buffered wavelength division multiplexing reception interfaces 120-X (X = 1 to M) demultiplex the wavelength division multiplexed optical signal input from one input terminal into a plurality of optical signals having different wavelengths. The plurality of optical signals are emitted as light from each of the plurality of output terminals, or the plurality of optical signals are converted into electric signals and extracted from the transmission frame.
The TM cell is temporarily stored in a buffer, the header of the ATM cell output from the buffer is processed, then converted into an optical signal, and emitted from each of a plurality of output terminals. A plurality of buffered wavelength division multiplex receiving interfaces 120-X
The output terminals of (X = 1 to M) are input ports 130- (Xn-n) to 130-Xn of the optical switch network 140.
Each of n (X = 1 to M) is connected to the input terminal of the optical switch network 140.

The plurality of buffered receiving interfaces 122-Y (Y = 1 to L) have one input terminal and one output terminal, and have a plurality of input optical transmission lines 160-Y.
(Y = 1 to L), which converts an optical signal incident from an input terminal into an electric signal and takes out the ATM from a transmission frame
The cells are temporarily stored in a buffer, the header of an ATM cell output from the buffer is processed, then converted into an optical signal, and emitted from an output terminal. Each output terminal of the plurality of buffered receiving interfaces 122-Y (Y = 1 to L) is connected to the input port 132-Y of the optical switch network 141.
(Y = 1 to L) and connected to the input terminal of the optical switch circuit 141.

The optical switch circuit 140 has a plurality of input terminals and a plurality of output terminals, and sets a predetermined optical line between a plurality of predetermined input terminals and a plurality of output terminals, or sets a plurality of buffers. Wavelength multiplex receiving interface 1
Optical signals are exchanged for each cell under the control of 20-X (X = 1 to M). The output terminals of the optical switch circuit 140 are output ports 131-1 to 131-1 of the optical switch circuit 140.
It is connected to the input terminal of the optical distribution switch network 150 through 131-Mn. Also, the optical switch circuit 141
Has a plurality of input terminals and a plurality of output terminals, and exchanges an optical signal for each cell under the control of a plurality of buffered reception interfaces 122-Y (Y = 1 to L). The output terminal of the optical switch circuit 141 is connected to the optical switch circuit 1
41 are connected to input terminals of the optical distribution switch network 150 through output ports 133-1 to 133-L.

The optical distribution switch network 150 has a plurality of input terminals and a plurality of output terminals, and switches an optical signal from the plurality of input terminals to a predetermined output terminal. The output terminals of the optical distribution switch network 150 are connected to the output ports 134-1 to 13-13 of the optical distribution switch network 150.
4-M · n through the wavelength transmission interface 121-1
To 121-M. The output terminal of the optical distribution switch network 150 is connected to the input terminals of the transmission interfaces 123-1 to 123-L through the output ports 135-1 to 135-L of the optical distribution switch network 150.

The wavelength multiplex transmission interface 121-
X (X = 1 to M) has a plurality of input terminals and one output terminal, and converts each optical signal incident on the optical line from the plurality of input terminals into an optical signal of a predetermined wavelength as light. Alternatively, each of the optical signals from the plurality of input terminals is converted into an electrical signal, the extracted ATM cell is stored in a transmission frame, and then converted into an optical signal of a predetermined wavelength, and the plurality of optical signals converted to a predetermined wavelength are converted. Are multiplexed and output from one output terminal. This wavelength multiplex transmission interface 121-X (X
= 1 to M) are connected to a plurality of output optical transmission lines 110-X (X = 1 to M) from which wavelength-multiplexed optical signals are output.

A plurality of output optical transmission lines 170-Y (Y = 1 to Y)
L) has one input terminal and one output terminal, converts each optical signal incident from the input terminal into an electric signal, stores the extracted ATM cell in a transmission frame, and then converts it into an optical signal. It is emitted from the output end. The output terminals of the plurality of transmission interfaces 123-Y (Y = 1 to L)
It is connected to a plurality of output optical transmission lines 170-Y (Y = 1 to L). In the first embodiment configured as described above,
An optical switch network 140 is provided for pass-through and branch connections, and an optical switch network 141 is provided for insert-and-return connections. To the output of. As a result, unnecessary hardware can be reduced, and the optical node can be downsized.

Next, the operation of the first embodiment will be described. In the following description, similarly, for convenience, sending a signal from an optical communication network composed of nodes to another local network or regional network accommodated by the own node is referred to as signal branching. Sending a signal from the network to the optical communication network is referred to as signal insertion, and transferring an optical signal from an adjacent node in the optical communication network to another node is referred to as signal passing.

Optical signals of n different wavelengths (λ1 to λn)
Are multiplexed and generated by the wavelength-division multiplexed input optical transmission line 100-X (X = 1 to M), respectively.
= 1 to M). Each of the buffered wavelength division multiplexing receiving interfaces 120-X (X = 1 to M) is connected to the input port 130- (Xn-n +) of the optical switch network 140.
1) to 130−X · n (X = 1 to M), each of which is connected to the optical switch network 140. Buffered wavelength multiplex receiving interface 120-X (X = 1 to M)
After demultiplexing the input wavelength-multiplexed optical signal into optical signals of n wavelengths, each of these n optical signals is divided into input ports 130- (xn-n + 1) to 130-Xn. (X =
1 to M) to the optical switch network 140.

Alternatively, each of the buffered wavelength division multiplexing receiving interfaces 120-X (X = 1 to M) separates the input wavelength division multiplexed optical signal into optical signals of n wavelengths, An ATM cell is extracted from the transmission frame for each optical signal, and although not shown in FIG. 1, the input ports 130- (Xn-n + 1) to 130
−x · n (X = 1 to M) also from the optical switch network 1
The optical cell is transmitted to 40.

On the other hand, reception interface 1 with buffer
Each of 22-Y (Y = 1 to L) is an input optical transmission line 160
The optical signal from -Y (Y = 1 to L) is received, the ATM cell is extracted from the transmission frame, and is stored in the buffer. Send the cell. Optical switch network 14
0 is the buffered wavelength division multiplexing reception interface 120
When an optical signal is input without passing through a buffer within −X (X = 1 to M), the optical signal is switched to a predetermined output port 131-1 to 131-M · n in a switched manner. It is transmitted by switching. When an optical cell is input via a buffer in the buffered wavelength division multiplexing reception interface 120-X (X = 1 to M), the optical switch network 140 receives the buffered wavelength division multiplexing reception interface 120-X (X = X = M). 1 to M), and switches to predetermined output ports 131-1 to 131-M · n for each cell according to a switching control signal notified by a control line (not shown).

On the other hand, when an optical cell is input from the buffered reception interface 122-Y (Y = 1 to L), the optical switch network 141 outputs from the buffered reception interface 122-Y (Y = 1 to L). The output ports 133-1 to 133-L are switched for each cell according to the header of the cell notified by a control line (not shown). The optical distribution switch network 150 includes the optical signals from the output ports 131-1 to 131-M · n of the optical switch network 140 and the output port 133 of the optical switch network 141.
-1 to 133-L output an optical signal from an output port 134-1
To 134-M · n and 135-1 to 135-L.

The wavelength multiplexing transmission interface 121-X
(X = 1 to M) are also output ports 134- (X
N−n + 1) to 134−X · n (X = 1 to M), each of which is connected to the optical distribution switch network 150.
WDM transmission interface 121-X (X = 1 to M)
Are output ports 134- (Xn-n + 1) to 1
34-X · n (X = 1 to M) via optical switch network 1
When an optical signal switched circuit-switched by 40 is input, after converting these into optical signals of n wavelengths,
A wavelength-division multiplexed optical signal generated by combining these signals is transmitted to a wavelength-division multiplexed output optical transmission line 110-X (X = 1 to M). Further, the wavelength division multiplexing transmission interface 121-X (X = 1 to
M) is an output port 134- (Xn-n + 1)
When the optical cells switched for each cell by the optical switch networks 140 and 141 are input via .about.134-X.multidot.n (X = 1 to M), these are inserted into the transmission frame every n and the n optical cells are inserted. After converting the optical signals into wavelength optical signals, the wavelength multiplexed optical signals generated by multiplexing them are transmitted to the wavelength multiplexed output optical transmission line 110-X (X = 1 to M).

On the other hand, the transmission interface 123-Y (Y
= 1 to L) are connected to the optical distribution switch network 1
It is connected to the optical distribution switch network 150 via 50 output ports 135-Y (Y = 1 to L). Therefore, each of the transmission interfaces 123-Y (Y = 1 to L) receives an optical cell switched for each cell by the optical switch networks 140 and 141 via the output port 135-Y (Y = 1 to L). Then, after inserting the cell into the transmission frame, the cell is converted into an optical signal, and the output optical transmission line 170-Y (Y
= 1 to L).

Next, a detailed configuration of each unit in the first embodiment of the present invention shown in FIG. 1 will be described. FIG.
2 and 3 show the detailed configurations of the buffered wavelength division multiplexing reception interface 120 and the wavelength division multiplexing transmission interface 121, respectively. The wavelength-division multiplexing reception interface 200 with a buffer and the wavelength-division multiplexing transmission interface 201 of FIG. 3 correspond to the wavelength-division multiplexing reception interface 1120 and the wavelength-division multiplexing transmission interface of the conventional optical communication network node shown in FIG. 1121 is also applicable.

As shown in FIG. 2, the wavelength-division multiplexed reception interface 200 with a buffer is connected to the wavelength-division multiplexed input optical transmission line 100-X (X = 1 to M) and the input terminal 210 of FIG. 140 input ports 130-
Each of (X · n−n + 1) to 130−X · n (X = 1 to M) is connected to the output terminal 211-Z (Z = 1 to n). The wavelength multiplexing / demultiplexing device 220 demultiplexes the wavelength multiplexed signal from the input terminal 210 into optical signals of n wavelengths and sends them to the optical switches 230-Z (Z = 1 to n). When the optical switch 230-Z (Z = 1 to n) causes an input optical signal to be switched in the optical switch network 140, the optical switch 230-Z and the photoelectric converter 240-Z of a photoelectric conversion system Extraction circuit 250-Z, buffer 260-Z, routing table 270-Z, electro-optical converter 280-Z (Z
= 1 to n) for short-cutting
Switch to 0-Z (z = 1 to n). Alternatively, the optical switch 230-Z (Z = 1 to n) causes the input optical signal to be exchanged with the buffer 260-Z (Z = 1 to n) and the optical switch network 140 of FIG. The optical signal is switched to the photoelectric converter 240-Z (Z = 1 to n).

The photoelectric converter 240-Z (Z = 1 to n) once converts the optical signals of the respective wavelengths predetermined from the wavelength multiplexing / demultiplexing device 220 into electrical signals, and temporarily converts the optical signals into electric signals. Z (Z = 1 to n). Each of the cell extracting circuits 250-Z (Z = 1 to n) receives an electric signal from the photoelectric converter 240-Z (Z = 1 to n), extracts cells from the transmission frame, and stores the cells in the buffer 260.
-Z (Z = 1 to n). Buffer 260-Z
(Z = 1 to n) temporarily stores input cells and sends the cells to the routing table 270-Z (Z = 1 to n) in a first-in / first-out manner, for example. The routing table 270-Z (Z = 1 to n) is stored in the buffer 2
Analyze the header of the cell from 60-Z (Z = 1-n),
From this, the output ports 131-1 to 131-M · n of the optical switch network 140 to be output are determined, the header is rewritten to a predetermined value, and the electro-optical converter 280-Z (Z = 1 to
to n).

Further, the routing table 270-Z
(Z = 1 to n) notifies the optical switch network 140 of the output port of the optical cell for switching control of the optical switch network 140. Electro-optical converter 280-Z (Z = 1 to
n) are routing tables 270-Z (Z = 1
To n) are converted to optical cells, and the optical combiner 290-
Send to Z (Z = 1 to n). Optical merger 290-Z (Z = 1
To n) are optical signals from the optical switches 230-Z (Z = 1 to n) or electro-optical converters 280-Z (Z = 1 to n).
From the output terminals 211-Z (Z = 1 to n)
Send to

As described above, the wavelength-division-multiplexed receiving interface 200 with buffer outputs the n optical signals multiplexed to the wavelength-division multiplexed signal from the input terminal 210 as output signals 211-Z (without passing through the buffer) as optical signals. Output to the output terminal 211-Z (Z = 1 to n) after taking out the cells from the transmission frame and temporarily storing them in a buffer after outputting to the Z = 1 to n) or converting them into electric signals, respectively. Can be.

On the other hand, as shown in FIG. 3, the wavelength division multiplexing transmission interface 201 is connected to the output ports 134- (Xn-n + 1) to 13 of the optical distribution switch network 150 of FIG.
4-X · n (x = 1 to M) is an input terminal 212-Z
(Z = 1 to n) and a wavelength multiplexed output optical transmission line 11
0-X (X = 1 to M) and the output terminal 213 are connected. The optical switch 221-Z (Z = 1 to n) switches the optical signal to the wavelength converter 271-Z while keeping the optical signal in the light when the input optical signal is switched in the optical switch network 140. The wavelength converters 271-Z (Z = 1 to n) convert the optical signals from the optical switches 221-Z (Z = 1 to n) into optical signals of a predetermined wavelength λZ (Z = 1 to n). Then, the signal is output to the wavelength multiplexer 281 via the optical coupler 261-Z (Z = 1 to n).

Alternatively, the optical switch 221-Z (Z = 1)
To n) indicate that the input optical signal is a buffer 260-Z (Z = 1 to 2) of the buffered wavelength division multiplexing reception interface 200.
n) and when performing ATM exchange with the optical switch network 140, the optical signal is switched to the photoelectric converter 231-Z (Z = 1 to n) of the photoelectric conversion and electrical conversion system. The photoelectric converter 231 -Z (Z = 1 to n) converts the input optical cell into an electric signal, and outputs the electric signal to the cell insertion circuit 241 -Z (Z = 1).
To n). Cell insertion circuit 241-Z (Z = 1 to n)
Input the cells from the photoelectric converters 231-Z (Z = 1 to n), insert them into the transmission frame, and send them to the electrical-optical converters 251-Z (Z = 1 to n).

The electro-optical converters 251-Z (Z = 1 to n) convert the electric signals from the cell insertion circuits 241-Z (Z = 1 to n) into optical signals of predetermined wavelengths λ1 to λn, respectively. Then, the signal is output to the wavelength multiplexer 281 via the optical coupler 261-Z (Z = 1 to n). The wavelength multiplexer 281 is
Signals of n wavelengths from the electro-optical converter 251-Z (Z = 1 to n) or the wavelength converter 271-Z (Z = 1 to n)
And multiplexes the optical signals from the first and second wavelength-multiplexed signals into an output terminal 21.
Send to 3. Thus, the wavelength multiplexing transmission interface 201 is connected to the input terminal 212-ZZ (Z = 1 to n).
After converting the optical signal from the optical signal into an electric signal, the cell is inserted into each transmission frame and converted into an optical signal of predetermined n wavelengths, or the input terminal 212-Z (Z =
1 to n) are converted to optical signals of predetermined n wavelengths as light, and the wavelength multiplexed signal is output to the output terminal 213.

Next, the detailed configurations of the buffered reception interface 122 and transmission interface 123 of FIG. 1 are shown in FIGS. 4 and 5, respectively. Again, the wavelength-division multiplexing reception interface 300 with a buffer having the configuration shown in FIGS.
The wavelength multiplex transmission interface 301 is also applicable to the buffered wavelength multiplex reception interface 1122 and wavelength multiplex transmission interface 1123 of the conventional optical communication network node shown in FIG. As shown in FIG.
Is connected to the input optical transmission line 160-y (y = 1 to L) and the input terminal 310 in FIG. 3
70.

The photoelectric converter 320 converts the optical signal from the input terminal 310 into a buffer 340 and an optical switch network 3.
The optical signal is once converted into an electric signal and output to the cell extracting circuit 330 in order to exchange the ATM with the ATM 40. The cell extracting circuit 330 receives an electric signal from the photoelectric converter 320, extracts a cell from the transmission frame, and sends the cell to the buffer 340. Buffer 340 temporarily stores an input cell, for example, first-in /
Send to routing table 350 on first out.

The routing table 350 analyzes the header of the cell from the buffer 340 and outputs the output ports 332-1 to 332- of the optical switch 340 to be output.
Mn or 333-Y (Y = 1 to L) is determined, and the header is rewritten to a predetermined value and sent to the electro-optical converter 360. Further, the routing table 350 notifies the optical switch network 340 of the output port of the optical cell for switching control of the optical switch network 340. The electro-optical converter 360 converts the cell from the routing table 350 into an optical cell and sends it to the output terminal 370. In this way, the reception interface with buffer 300 converts the optical signal from the input terminal 310 into a buffer, converts the buffer into an electric signal, extracts cells from the transmission frame, temporarily stores the cells in the buffer, and outputs the cells to the output terminal 370. be able to.

On the other hand, as shown in FIG. 5, the transmission interface 301 has output ports 135-Y (Y = 1 to L) of the optical distribution switch network 150 shown in FIG.
11 and the output optical transmission line 170-Y (Y = 1 to
L) and the output terminal 351 are connected. The opto-electric converter 321 converts the optical signal from the input terminal 311 into an electric signal and sends the electric signal to the cell insertion circuit 331.

The cell insertion circuit 331 includes the photoelectric converter 32
The cells from 1 are input, inserted into the transmission frame, and sent to the electro-optical converter 341. The electro-optical converter 341 converts the electric signal from the cell insertion circuit 331 into an optical signal and sends it to the output terminal 351. Thus, the transmission interface 301 converts the optical signal from the input terminal 311 into an electric signal, then inserts each cell into the transmission frame, and outputs the optical signal to the output terminal 351.

For example, the optical switch network 400 of FIG. 6 can be applied to the optical switch networks 140 and 141 of FIG. Again, the optical switch network 40 having the configuration shown in FIG.
0 is also applicable to the optical switch network 1140 of the conventional optical communication network node shown in FIG. The optical switch network 400 is connected to the input ports 130-X of FIG.
(X = 1 to M) or 132-Y (Y = 1 to L)
Input terminals 410-1 to 410-N (where N = M · n
Or N = L), and the output port 131- of FIG.
X (X = 1 to M) or 133-Y (Y = 1 to L)
Are output terminals 440-1 to 440-N (where N = M
N or N = L).

The optical switch network 400 is composed of N optical sub-switch modules 401-K (K = 1 to N), each of which has one 1 × N optical splitter 420,
NX1 optical switch 430. 1X
Each of the N optical splitters 420-K (K = 1 to N) splits an optical signal from the input terminal 410-K (K = 1 to N) into N optical signals, and then switches each of them to an NX1 optical switch. 430-K
(K = 1 to N). NX1 optical switch 430-
K (K = 1 to N) is the optical switch network 140 of FIG.
Since a switching operation is required for each cell in the 141, a small-sized semiconductor optical switch capable of high-speed switching is suitable.

NX1 optical switches 430-1 to 430-N
Select one of the N optical signals from the 1 × N optical splitters 420-K (K = 1 to N) and output terminals 440-1 to 440-1
Emitted to 440-N. NX1 optical switch 430 of FIG.
-1 to 430-N are input terminals 410-1 to 410-N
When switching the optical signal input from the terminal in a circuit switching manner, the input terminals 410-1 to 410-N and the output terminal 440 are used.
Control is performed such that a predetermined line is set between −1 to 440-N. Such a line setting is semi-fixedly performed by, for example, a network management system, or is realized on demand using a connection control protocol started between nodes.

Alternatively, the NX1 optical switches 430-1 to 430-1
430-N is used when switching the optical signals input from the input terminals 410-1 to 410-N for each cell.
Multiplexed reception interface with buffer 120-X
The optical signal is switched for each cell by a switching control signal corresponding to the header of the cell processed by (X = 1 to M). As described above, by the optical switch network 400 having the configuration shown in FIG.
The optical signal input from 410-N is output to an optional output terminal 4
Circuit switching or cell switching can be performed at 40-1 to 440-N.

Further, the optical switch network 400 shown in FIG.
With the addition or reduction of the input terminal 410 and the output terminal 440, the optical sub-switch module 401-K (K
= 1 to N). For example, the wavelength division multiplexed input optical transmission line 100-X (X =
1 to M) and the wavelength multiplexed output optical transmission line 110-X (X = 1 to
Each time one M) is added, one optical sub-switch module 401 is added.

Note that the optical switch networks 140, 1 in FIG.
Reference numeral 41 is not limited to the optical switch network 400 shown in FIG.
"Study of wavelength division and space division combined optical network", IEICE Technical Committee, SSE92-148, pp. 31−36, 1
992) and the literature (Atsushi WATANAB
E, Satoru OKAMOTO, Ken-ichi SATO, “Optical Pat
h Cross-Connect Node Architecture with High
Modularity for Photonic Transport Network
s ", IEICE TRANS.COMMUN.VOL.E77-B, NO.10 O
CTOBER 1994. ) The circuit network described (Fig. 6) can also be applied.

The optical distribution switch network 150 shown in FIG.
Also, in the optical switch network 400 of FIG. 6, N = (M
N + L). However, the optical distribution switch network 150 includes the optical switch network 140,
Since the optical signal from the buffer 141 is semi-fixedly connected to the buffered wavelength division multiplexing transmission interface 121 and the transmission interface 123, the switching operation for each cell required for the optical switch networks 140 and 141 is unnecessary, and the configuration is not shown. The NX1 optical switch 430 that is used even though it is the same as 6,
An inexpensive and small mechanical optical switch can be applied.

As described above, the optical communication network node according to the first embodiment of the present invention, the configuration of which is shown in FIG.
= 1 to M), the cells multiplexed with the optical signal of an arbitrary wavelength transmitted to an arbitrary output optical transmission line 170-Y (Y = 1 to M).
L). Further, according to the first embodiment of the present invention, any input optical transmission line 160-Y
The cell from (Y = 1 to L) is converted into an optical signal of an arbitrary wavelength and wavelength-multiplexed output optical transmission line 110-X (X = 1 to M)
Can be inserted. Furthermore, the optical communication network node according to the first embodiment of the present invention converts an optical signal of an arbitrary wavelength of an arbitrary wavelength multiplex input optical transmission line 100-X (X = 1 to M) into an arbitrary wavelength multiplex output light. Transmission line 110-X (X
= 1 to M), the optical signal can be passed between the wavelength multiplexed input / output optical transmission lines, and the input optical transmission line 160-Y (Y = 1 to
L) and an arbitrary output optical transmission line 170-Y (Y = 1 to L) can also be connected back.

When the optical communication network node according to the first embodiment of the present invention is analyzed by a space division equivalent circuit, the number of cross points required for an optical switch network can be reduced as compared with the related art. In the optical communication network according to the first embodiment of the present invention, the connection functions of dropping / inserting, passing, and returning signals are realized by one optical switch network used in the conventional configuration. This is because the node divides the optical switch network for each connection function. For example, when M = 8, n = 8, and L = 64, the conventional configuration of FIG.
Is always (Mn + L) 2 = 11282
= 16384 cross points are required.

On the other hand, in the optical communication network node according to the first embodiment of the present invention, when passing and branching connection is used, the optical switch network 140 is used, and the optical communication network node is used for insertion and return connection. Since the switch network 141 is used, analysis using a space division equivalent circuit gives
(M · n) 2 = both optical switch networks 140 and 141
4096, L2 = 4096 cross points are required, and the total required cross points is 8192, which is 1
/ 2. Therefore, the optical communication network node according to the first embodiment of the present invention reduces the number of unnecessary crosspoints of the optical switch network in the equivalent of a space division equivalent circuit, and as a result, the hardware equivalent to the unnecessary number of crosspoints Hardware can be reduced, and the device can be downsized.

Next, a description will be given of a second embodiment of the optical communication network node according to the present invention. FIG. 7 is a block diagram showing the configuration of the second embodiment. The configuration of the second embodiment will be described with reference to FIG. In FIG. 7, a plurality of input optical transmission lines 500-x (x = 1 to M) to which a wavelength multiplexed optical signal is input are provided at one input terminal, having one input terminal and a plurality of output terminals. It is connected. The plurality of buffered wavelength division multiplexing reception interfaces 520-X (X = 1 to M) convert the wavelength division multiplexed optical signals incident through each of the plurality of input optical transmission lines 500-X (X = 1 to M) into wavelengths. An ATM cell that splits the optical signals into a plurality of different optical signals and then emits these optical signals as light from each of the plurality of output terminals, or converts the optical signals into electrical signals and extracts them from the transmission frame. Is temporarily stored in a buffer, and the AT output from the buffer
After processing the header of the M cell, it is converted into an optical signal and emitted from each of the plurality of output terminals.

The output end of the buffered wavelength division multiplexing reception interface 520-X (X = 1 to M) is connected to the input port 530- (Xn−n +) of the optical selective switch network 540.
1) to 530-X · n (X = 1 to M) and connected to the input terminal of the optical selection switch network 540. The optical selection switch network 540 has a plurality of input terminals and a plurality of output terminals, and selectively branches optical signals from the plurality of input terminals to one or more predetermined output terminals. Output terminals of the optical selection switch network 540 are connected to input ports 531-(PMn-Mn + 1) to 531 of optical switches 550-P (P = 1 to M) to 550-Mn.
-Optical switch 5 via PMn (P = 1 to Mn)
50-P (P = 1 to M) to 550-M · n.

Optical switches 550-P (P = 1 to M) to 5
The output terminal of 50-M · n is connected to its output port 534-P
(P = 1 to M · n) through the optical distribution switch network 66
0 is connected to the input terminal. Optical switch 550-P
(P = 1 to M) to 550−M · n are a plurality of input terminals and 1
A predetermined optical line between a plurality of predetermined input terminals and one output terminal, or a plurality of buffered wavelength multiplex reception interfaces 52
Optical signals are exchanged for each cell under control from 0-x (x = 1 to M).

Each of the plurality of buffered receiving interfaces 522-y (y = 1 to L) has one input terminal and one output terminal, and the input terminal is an input optical transmission line 570-y (y = 1
1 to L) are connected. The plurality of buffered receiving interfaces 522-y (y = 1 to L) convert optical signals incident through each of the input optical transmission lines 570-y (y = 1 to L) into electric signals and convert the signals from transmission frames. The extracted ATM cells are temporarily stored in a buffer, the header of the ATM cells output from the buffer is processed, then converted into an optical signal, and emitted from the output terminal.

Receiving interface with buffer 522
The output terminal of Y (Y = 1 to L) is connected to the optical selection switch network 5
41 through the input port 532-Y (Y = 1 to L)
The optical selection switch network 541 is connected to the input terminal. Like the optical selection switch network 540, the optical selection switch network 541 has a plurality of input terminals and a plurality of output terminals, and outputs optical signals from the plurality of input terminals to one or more predetermined output terminals. It branches selectively to the end. The output terminal of the optical selection switch network 541 is connected to the input port 531-(P ·) of the optical switch 551 -Y (Y = 1 to L).
M · n−M · n + 1) to 531−P · M · n (P = 1 to
M.n).

This optical switch 551-Y (Y = 1 to L)
Output ports 536-Y (Y = 1 to L) are connected to the input terminals of the optical distribution switch network 560. The optical distribution switch network 560 has a plurality of input terminals and a plurality of output terminals, and switches an optical signal from the plurality of input terminals to a predetermined output terminal. The output ports 535-1 to 53-53 of the optical distribution switch network 560
5-M · n is the wavelength division multiplexing transmission interface 521-1
521-M.

The wavelength division multiplexing transmission interfaces 521-1 to 521-1
Reference numeral 521-M has a plurality of input terminals and one output terminal. The output terminal 521-M has a wavelength multiplexed output transmission line 510-X (X = 1
To M) are connected. The wavelength-division multiplexing transmission interfaces 521-1 to 521-M convert each of the optical signals incident on the optical lines from the plurality of input terminals into an optical signal of a predetermined wavelength as light, or convert the signals from the plurality of input terminals. After converting each optical signal into an electric signal and storing the extracted ATM cell in a transmission frame, the ATM cell is converted into an optical signal of a predetermined wavelength,
The plurality of optical signals converted to the predetermined wavelength are combined to obtain 1
Out of the two output ends.

Further, the optical distribution switch network 560
Is connected to the input terminal of the transmission interface 523-Y (Y = 1-l) via the output port 537-Y (Y = 1 to L). The transmission interface 523-Y (Y = 1−
The output terminal of l) is an output transmission line 580-Y (Y = 1-L)
It is connected to the. The transmission interface 523-Y (Y
= 1-l) has one input terminal and one output terminal, converts each optical signal incident from the input terminal into an electric signal, stores the extracted ATM cell in a transmission frame, and stores the ATM signal in a transmission frame. To the output transmission line 580-Y from the output end.
(Y = 1-L).

In the second embodiment, the optical selection switch network 540 and the (MN) X1 optical switch 550-p
(P = 1 to M · n) or the optical selection switch network 5
41 and the Lx1 optical switch 551-y (y = 1 to L) realize an optical switch network for passing and branching connection and an optical switch network for insertion and return connection, respectively, to reduce the number of cross points. And the optical selection switch networks 540 and 541 each have a predetermined (M · n)
x1 optical switch 550-p (p = 1 to M · n), Lx1
The optical signal is branched only to the optical switch 551-y (y = 1 to L) to reduce unnecessary optical branching.

Next, the operation of the second embodiment will be described. In the description of the operation of the second embodiment, in the following description as well, for the sake of convenience, a signal from an optical communication network composed of nodes is transmitted to another local network or regional network accommodated by the own node. Is called signal branching, and conversely, sending signals from these local networks and regional networks to the optical communication network is called signal insertion, and optical signals from adjacent nodes in the optical communication network are sent to other nodes. Transferring is referred to as signal passing.

Optical signals of n different wavelengths (λ1 to λn)
Are multiplexed and generated by the wavelength division multiplexing input optical transmission line 500-X (X = 1 to M), respectively, and the wavelength division multiplexing reception interface 520-X (X
= 1 to M). Each of the buffered wavelength division multiplexing reception interfaces 520-X (X = 1 to M) has an input port 530- (Xn-n + 1) to 530-Xn (X
= 1 to M), and an optical selection switch network 540
Is connected to Each of the buffered wavelength division multiplexing reception interfaces 520-X (X = 1 to M) demultiplexes the input wavelength division multiplexed optical signal into n wavelength optical signals,
Each of these n optical signals is supplied to an input port 530- (Xn-
n + 1) to 530-X · n (X = 1 to M) to the optical selection switch network 540.

Alternatively, each of the buffered wavelength division multiplexing reception interfaces 520-X (X = 1 to M) separates the input wavelength division multiplexed optical signal into optical signals of n wavelengths, and then converts each of the n wavelength division multiplexed optical signals into n optical signals. An ATM cell is extracted from the transmission frame for each optical signal, and input port 530- (X ·
n-n + 1) to 530-X.n (X = 1 to M) also sends out the optical cells to the optical selection switch network 540.

On the other hand, reception interface 5 with buffer
Each of 22-Y (Y = 1 to L) is an input optical transmission line 570
-The optical signal from Y (Y = 1 to L) is received, the ATM cell is extracted from the transmission frame, and is stored in the buffer. Send an optical cell. The optical selection switch networks 540 and 541 each convert the input optical signal into (M ·
n) predetermined (M · n) X1 optical switches 550−
It branches to only P (P = 1 to M · n) or only to a predetermined LX1 optical switch 551-Y (Y = 1 to L) of L pieces.

(M · n) X1 optical switch 550-P (P
= 1 to M · n) are input ports 531-(P · M · n−M · n + 1) − without passing through a buffer in the buffered wavelength division multiplexing reception interface 520 -X (X = 1 to M).
Any one of the optical signals incident from the 531-PMn (P = 1 to Mn) is output to the output port 534-P (P = 1
To Mn) in a circuit-switched manner. Also, (M
n) The X1 optical switch 550-P (P = 1 to M · n)
Buffered wavelength multiplex receiving interface 520-X
(X = 1 to M) via input buffer 531-
(PMn-Mn + 1) -531-PMn (p
= 1 to M · n), the wavelength-division multiplexed receiving interface with buffer 520-X (X = 1 to M)
Output ports 534-P (P = 1 to M) according to a switching control signal notified by a control line (not shown)
・ Switch to n) for each cell.

On the other hand, the LX1 optical switch 551-Y (Y =
1 to L) are reception interfaces with buffers 522-
Input port 533 via a buffer in Y (Y = 1 to L)
− (Y · L−L + 1) to 533−Y · L (Y = 1 to L)
An optical cell incident from the output port 536-Y (Y = 1 to L) according to a switching control signal notified from a buffered reception interface 522-Y (Y = 1 to L) through a control line (not shown). Switch to each cell. The optical distribution switch network 560 is (M · n) X1
Output port 534-PO (P = 1 to M · n) of optical switch 550-P (P = 1 to M · n) and LX1 optical switch 5
51-Y (Y = 1 to L) output port 536-Y (Y =
1 to L) to output ports 535-1 to 535.
-M · n and 537-1 to 537-L.

Wavelength multiplex transmission interface 521-X
(X = 1 to M) are output ports 535- (Xn-
n + 1) to 535−X · n (X = 1 to M) are connected to the optical distribution switch network 560. Each of the wavelength multiplexing transmission interfaces 521-X (X = 1 to M) is an (M · n) X1 optical switch 550-P (P = 1 to M
The optical signals switched circuit-switched by (n) are output ports 535- (Xn-n + 1) to 535-Xn.
(X = 1 to M), these are converted into optical signals of n wavelengths, and then these are multiplexed to generate a wavelength multiplexed optical signal, which is then output to a wavelength multiplexed output optical transmission line 510-X (X =
1 to M). Each of the wavelength division multiplexing transmission interfaces 521-X (X = 1 to M) is (M · n) X1
The optical cells switched for each cell by the optical switch 550-P (P = 1 to M · n) and the LX1 optical switch 551-Y (Y = 1 to L) are output to the output port 535- (X · n−n).
+1) to 535-Xn (X = 1 to M), these are inserted into the transmission frame every n and converted into optical signals of n wavelengths, and then multiplexed to generate them. The wavelength-division multiplexed optical signal is converted to a wavelength-division multiplexed output optical transmission line 510-X (X
= 1 to M).

On the other hand, the transmission interface 523-Y (Y
= 1 to L) are output ports 537-Y (Y = 1 to L).
In L), the optical distribution switch network 560 is connected.
Each of the transmission interfaces 523-Y (Y = 1 to L) is an (M · n) X1 optical switch 550-P (P = 1 to M
N) and the optical cell switched for each cell by the LX1 optical switch 551-Y (Y = 1 to L) is output port 5
When input via 37-Y (Y = 1 to L), the cell is inserted into the transmission frame, converted into an optical signal, and output optical transmission path 5
80-Y (Y = 1 to L).

Next, a detailed configuration of each section in the second embodiment of the present invention shown in FIG. 7 will be described. As the wavelength-division multiplex reception interface with buffer 520 and the wavelength-division multiplex transmission interface 521 in FIG. 7, the wavelength-division multiplex reception interface 200 with the configuration shown in FIG. Further, as the reception interface with buffer 522 and the transmission interface 523 in FIG. 7, the reception interface with buffer 300 having the configuration shown in FIG. 4 and the transmission interface 301 shown in FIG.

The same configuration as the optical distribution switch network 150 of FIG. 1 can be applied to the optical distribution switch network 560 of FIG. Further, the optical selection switch network 54 of FIG.
0 and 541 each have R input terminals shown in FIG.
S) an optical selection switch network 60 with output terminals
0 is applicable. However, the optical selection switch network 600
Is applied to the optical selection switch network 540, R
= M · n and S = M · n, and n output terminals of the buffered wavelength division multiplexing reception interface 520-X (X = 1 to M) are connected to the input terminals 610-1 to 610-R, respectively, M · n) X1 optical switch 550-P (P = 1 to M
· N) M · n input ports 531- (P · M · n-
M · n + 1) to 531- (P · M · n) (P = 1 to M ·
n) is connected to an output terminal group 650-w (w = 1 to S) composed of R output terminals.

On the other hand, when the optical selective switch network 600 is applied to the optical selective switch network 541, R = L,
S = L, and the reception interface with buffer 522
-Y (Y = 1 to L) output terminals are input terminals 610-1 to 610-1
610-R, Lx1 optical switch 551-Y
(Y = 1 to L) L input ports 533-(Y · L−
L + 1) to 531- (Y · L) (Y = 1 to L) are output terminal groups 650-W composed of R output terminals.
(W = 1 to S). 1XS optical switch 620
Each of −V (V = 1 to R) is an input terminal 610 −V (V
= 1-R) to S output ports 630−
Branch to only a predetermined output port among (V · S−S + 1) to 630−V · S (V = 1 to R).

The 1XS optical switch 620-V (V = 1 to
R) S output ports 630- (V · S−S + 1) to
630-V · S (V = 1 to R) are connected to the S output terminal groups 650-W (W = 1 to S), respectively, so that the output terminal groups 650-W (W = 1 To 〜S) are each composed of R output terminals 650-1 to 650-RS. Therefore, the 1XS optical switch 620-V
(V = 1 to R) is the input terminal 610-V (V = 1 to R)
From the S output terminal groups 650-W
(W = 1 to S), and selectively branch one by one to an arbitrary output terminal group, and output terminals 650-1 to 650-R
-It can be emitted from S.

Similarly to the optical distribution switch network 560, the optical selective switch networks 540 and 541 each include a buffered wavelength division multiplexing reception interface 520-X (X = 1 to M) or a buffered reception interface 522-Y (Y
= 1 to L), the (M · n) X1 optical switch 5
Since it is semi-fixedly connected to 50-P (P = 1 to M · n) or LX1 optical switch 551-Y (Y = 1 to L),
The optical selection switch networks 540 and 541 do not require a switching operation for each cell, and the 1XS optical switch 620-V
For (V = 1 to R), an inexpensive and small mechanical optical switch can be used.

Next, the operation of the second embodiment shown in FIG. 7 will be described with reference to FIGS. For convenience of description, FIGS. 9 and 10 show configurations in which M, n, and L in FIG. 7 are M = 2, n = 3, and L = 6. In FIG. 9, the wavelength-division multiplexed optical signals of .lambda.1 to .lambda.3 from the wavelength-division multiplexed input optical transmission line 700-1 are buffered wavelength-division multiplex reception interfaces 720-.
The signal is demultiplexed by 1, and is input to the 1 × 6 optical switches 740-1 to 740-3 without passing through the buffer. 1X6 optical switches 740-1 to 740-3 and 6X1 optical switch 750-
1 to 750-3 equivalently constitute a 3 × 3 optical switch network.
X6 optical switches 740-1 to 740-3 branch into three,
Each of them is circuit-switched by the 6 × 1 optical switches 750-1 to 750-3 and sent to the optical distribution switch network 760.

The λ from the wavelength division multiplexing input optical transmission line 700-2
The wavelength-division multiplexed optical signals 1 to λ3 are demultiplexed by the buffered wavelength-division multiplexing reception interface 720-2 and input to the 1 × 6 optical switches 740-4 to 740-6 via the buffer. Similarly, 1 × 6 optical switches 740-4 to 740-6
And 6X1 optical switches 750-4 to 750-6 equivalently constitute a 3X3 optical switch network, and an optical signal incident on this network is a 1X6 optical switch 740-4.
To 740-6, each of which is a 6 × 1 optical switch 7
The cells are exchanged for each cell by 50-4 to 750-6 and sent to the optical distribution switch network 760.

The optical signals from the input optical transmission lines 770-1 to 770-3 are transmitted to the buffered reception interface 722-1.
Through the buffers included in the 1 × 6 optical switches 741-1 to 741-3. Again, 1 × 6 optical switches 741-1 to 741-3 and 6 × 1 optical switch 7
The 3X3 optical switch network is equivalently constituted by 51-1 to 751-3, and the optical signal incident thereon is divided into three by the 1 × 6 optical switches 741-1 to 741-3, each of which is 6 × 1. Optical switches 751-1 to 751-3
Is switched on a cell-by-cell basis by the optical distribution switch network 7
60.

The input optical transmission lines 770-4 to 770-
The optical signal from the receiving interface 72 is a buffered receiving interface 72.
The light enters the 1 × 6 optical switches 741-4 to 741-6 via the buffers included in 2-4 to 722-6. 1 × 6 optical switch 741-4 to 741-6 and 6 × 1 optical switch 7
51-4 to 751-6, equivalently 3X3
An optical switch network is formed, and an optical signal incident on the optical switch network is divided into three by 1 × 6 optical switches 741-4 to 741-6, each of which is a 6 × 1 optical switch 751-4 to 75-1.
The data is exchanged for each cell by 1-6 and sent to the optical distribution switch network 760.

The optical distribution switch network 760 transmits the optical signals from the 6 × 1 optical switches 750-1 to 750-3 to the wavelength division multiplexing transmission interface 721-1 and the optical signals from the 6 × 1 optical switches 750-4 to 750-6. To the transmission interfaces 723-1 to 723-3, the optical signals from the 6X1 optical switches 751-1 to 751-3 to the wavelength multiplexing transmission interface 721-2, and the 6X1 optical switch 7
The optical signals from 51-4 to 751-6 are switched to transmission interfaces 723-4 to 723-6, respectively.

As described above, the optical communication network node of the second embodiment shown in the example of FIG. 9 multiplexes the optical signals of λ1 to λ3 on the wavelength multiplexing input optical transmission line 700-1 by wavelength multiplexing. Cells that are passed to the output optical transmission line 710-1 and are carried by the optical signals of λ1 to λ3 on the wavelength-multiplexed input optical transmission line 700-2 can be branched to the output optical transmission lines 780-1 to 780-3. . Also, in the embodiment of FIG. 9, the optical communication network nodes are input optical transmission lines 770-1 to 770-1
The cell carried by the optical signal from 770-3 is inserted into the wavelength multiplexed output optical transmission line 710-2, and the input optical transmission line 770-4 is inserted.
770-6 can be connected back to the output optical transmission lines 780-4 to 780-6.

Next, with reference to FIG. 10, a description will be given of a configuration change when the ratio of traffic to be passed, dropped, inserted, and looped back in the configuration of FIG. 9 is changed. In FIG. 10, λ1 to λ1-
The wavelength-division multiplexed optical signal of λ3 is demultiplexed by the buffered wavelength-division multiplexing reception interface 820-1.
840-2. This time, 1X6 optical switches 840-1 to 840-2 and 6X1 optical switch 850-1
To 850-2 equivalently constitute a 2 × 2 optical switch network, and the optical signal incident thereon is split into two by 1 × 6 optical switches 840-1 to 840-2, each of which is a 6 × 1 optical switch 850-. 1 to 850-2, and is sent to the optical distribution switch network 860.

Λ1 to λ3 wavelength multiplexed input optical transmission line 800-
The wavelength-division multiplexed optical signals of λ1 to λ3 are demultiplexed by the buffered wavelength-division multiplexing reception interface 720-2. Optical switch 840-3 to 8
40-6. 1X6 optical switch 840-3 ~
840-6 and 6X1 optical switch 850-3 to 850-6
This time, a 4 × 4 optical switch network is equivalently constructed, and the optical signal incident thereon is divided into four by 1 × 6 optical switches 840-3 to 840-6, each of which is 6 × 1.
The cells are exchanged for each cell by the optical switches 850-3 to 850-6 and transmitted to the optical distribution switch network 860.

The input optical transmission lines 870-1 to 870-
The optical signal from the receiving interface 82
The light enters the 1 × 6 optical switches 841-1 to 841-2 via the buffers of 2-1 to 822-2. 1 × 6 optical switch 841-1 to 841-2 and 6 × 1 optical switch 8
A 2 × 2 optical switch network is equivalently constituted by 51-1 to 851-2, and an optical signal incident on this network is split into two by 1 × 6 optical switches 841-1 to 841-2, each of which is 6 × 1. Optical switches 851-1 to 851-2
Is switched for each cell by the optical distribution switch network 8
60.

Further, the input optical transmission lines 870-3 to 870
-6 from the buffered receiving interface 8
The light enters the 1 × 6 optical switches 841-3 to 841-6 via the buffers of 22-3 to 822-6. 1X6
The optical switches 841-3 to 841-6 and the 6X1 optical switches 851-3 to 851-6 are also equivalently 4X.
A four-optical switch network is configured, and the optical signal incident on this is a 1 × 6 optical switch 841-3 to 841-6.
And 4 branches, each of which is a 6 × 1 optical switch 851-3 to 851-8
The data is exchanged for each cell by 51-6 and sent to the optical distribution switch network 860.

The optical distribution switch network 860 transmits the optical signals from the 6 × 1 optical switches 850-1 to 850-2 and the 6 × 1 optical switch 851-3 to the wavelength division multiplexing transmission interface 821-1 and sends the 6 × 1 optical switches 850-3 to 850.
-6 from the transmission interfaces 823-3 to 823-8
To 23-6, 6X1 optical switches 851-1 to 851-2
From the transmission interfaces 823-1 to 823
-2, and 6X1 optical switches 851-4 to 851-
6 from the wavelength division multiplexing transmission interface 821-
Switch to 2 each.

As described above, the optical communication network node in the example of FIG.
-1 through the wavelength division multiplexing output optical transmission line 810-1 and the remaining one wavelength on the wavelength division multiplexing input optical transmission line 800-1 and the wavelength division multiplexing input light. Cells carried by optical signals of three wavelengths λ1 to λ3 on the transmission path 800-2 can be branched to output optical transmission paths 880-3 to 880-6. In the example of FIG. 10, the optical communication network node converts the cells carried by the optical signals from the input optical transmission lines 870-1 to 870-2 into the output optical transmission lines 880-1 to 880-1.
880-2, and the cell carried by the optical signal from the input optical transmission line 870-3 is converted to a wavelength multiplexed output optical transmission line 810-.
1 and the cells carried by the optical signals from 870-4 to 880-6 can be inserted into the output optical transmission line.

As described above, when the optical communication network node of the second embodiment is analyzed by the space division equivalent circuit, the number of cross points required for the optical switch network can be reduced as compared with the related art. This is because a single optical switch network used in the conventional configuration realizes each connection function of dropping / inserting, passing, and returning a signal, whereas the optical communication network node of the second embodiment has: Optical selection switch networks 540, 541 and (Mn)
This is because the X1 optical switch 550 and the LX1 optical switch 551 can configure a non-blocking optical switch network corresponding to each connection function.

As in the previous example, M = 8, n = 8,
When L = 64, the space division equivalent circuit of the optical switch network 1140 is always (Mn + L) in the conventional configuration of FIG.
2 = 1282 = 16384 cross points are required. On the other hand, in the optical communication network node according to the second embodiment, when passing and branching are connected, the (M · n) X1 optical switch 550 is used.
LX1 optical switch 55 for insertion and loopback connections
Therefore, when using a space division equivalent circuit, (M · n) 2 = 4096 and L2 = 4096 crosspoints are required, and the total required crosspoint number is 8
In 192, it can be reduced to half of the conventional case. The reason why the number of cross points of the optical selective switch networks 540 and 541 is not counted here is that the optical switches used for these do not require a high-speed switching operation for each cell.
This is because the electric drive circuit of the optical switch can be realized by a simple circuit, so that a small and inexpensive optical switch can be applied as compared with the (M · n) X1 optical switch 550 and the LX1 optical switch 551.

Further, features of the optical communication network node of the second embodiment in comparison with the optical communication network node of the first embodiment will be described. For example, attention will be given to the case where branch traffic is handled in the optical communication network node according to the first embodiment of the present invention in FIG. In the optical switch network 140, the branch traffic is any a out of M · n input ports 130 and M · n
If it is assumed that switching can be performed on a cell-by-cell basis between any number a of the output ports 131, each of the input a optical signals in the optical switch network 140 is independent of the number a of output ports to which it is switched. M · n branches occur, and the amount of light decreases.

On the other hand, in the optical communication network node according to the second embodiment shown in FIG. 7, assuming the same switching, the 1XS optical switch 620 in the optical selection switch 540 switches the input a number of optical switches. Since the signal is selectively branched to only a predetermined number of output ports, the light quantity does not decrease more than necessary. Therefore, the optical communication network node according to the second embodiment includes the optical selective switch network 5
40, 541 and (M · n) X1 optical switch 550, LX
The optical loss in the non-blocking optical switch circuit corresponding to each connection function constituted by the one optical switch 551 can be reduced.

Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 11 is a block diagram showing the configuration of the third embodiment. In FIG. 11, a plurality of buffered wavelength-division multiplexing receiving interfaces 920-x (x = 1 to M) include a plurality of wavelength-division multiplexed optical paths 900 to which a wavelength-division multiplexed optical signal is input to one input terminal.
−X (X = 1 to M) are respectively connected, and a plurality of output terminals are connected to the input ports 930-(X · n−n + 1) to 930 −X · (of the optical distribution switch network 940. X =
1 to M) are connected to the input end of the optical distribution switch network 940. The wavelength-division-multiplexed reception interface with buffer 920-x (x = 1 to M) demultiplexes the wavelength-division multiplexed optical signal into a plurality of optical signals having different wavelengths, and then converts the plurality of optical signals into a plurality of output terminals as light. , Or convert a plurality of optical signals into electrical signals, temporarily store ATM cells extracted from the transmission frame in a buffer, process the header of the ATM cells output from the buffer, and process the optical signals. And output from each of the plurality of output terminals.

Receiving Interface 9 with Multiple Buffers
The input terminals of 22-Y (Y = 1 to L) are connected to a plurality of input optical transmission lines 960-Y (Y = 1 to L). A plurality of buffered reception interfaces 922-Y (Y = 1 to
The output terminal of L) is connected to the input terminal of the optical distribution switch network 940 through the input ports 932-1 to 932-L of the optical distribution switch network 940. The plurality of receiving interfaces with buffers 922-Y (Y = 1 to L)
The optical signal input from the input terminal is converted into an electric signal, and the ATM cell extracted from the transmission frame is temporarily stored in a buffer. Out of the light.

The output terminal of the optical distribution switch network 940 is connected to the input terminal of the optical switch network 950 by the input port 9.
31-1 to 931-M · n, and connected to the input terminal of the optical switch network 951 through its input ports 93-1 to 933L. The optical distribution switch network 940 has a plurality of input terminals and a plurality of output terminals, and switches an optical signal from the plurality of input terminals to a predetermined output terminal.

The output terminal of the optical switch network 950 is connected to the input terminals of the wavelength division multiplexing transmission interfaces 921-1 to 921-M through the output ports 934-1 to 934-Mn. Similarly, the optical switch network 951
Of the plurality of wavelength division multiplexing transmission interfaces 921-1 through 924-1 through its output ports 935-1 through 934-L.
921-M. The optical switch network 950 has a plurality of input terminals and a plurality of output terminals, and sets up a predetermined optical line between a plurality of predetermined input terminals and output terminals, or a plurality of buffered wavelength division multiplexing. The receiving interface 920-X (X = 1 to M) and the plurality of buffered interfaces 922-Y (Y = 1
To L), the optical signal is exchanged for each cell.

The optical switch network 951 has a plurality of input terminals and a plurality of output terminals, and includes a plurality of buffered wavelength division multiplexing reception interfaces 920-x (x = 1 to M).
And a plurality of receiving interfaces with buffers 922-
Optical signals are exchanged for each cell under the control of y (y = 1 to L).

The plurality of wavelength multiplex transmission interfaces 9
Each of 21-1 to 921-M has a plurality of input terminals and one output terminal, and converts each of the optical signals on the optical line incident from the plurality of input terminals into an optical signal of a predetermined wavelength as light. Or, after converting each of the optical signals from the plurality of input terminals into an electric signal and storing the extracted ATM cell in a transmission frame, the ATM cell is converted into an optical signal of a predetermined wavelength and converted to a predetermined wavelength. A plurality of optical signals are multiplexed and output from one output terminal. A plurality of first output optical transmission lines 910-x (x = 1 to M) to which a wavelength multiplexed optical signal is output are connected to this output terminal.

The plurality of transmission interfaces 923-y
(Y = 1 to L) has one input terminal and one output terminal, converts each optical signal incident from the input terminal into an electric signal, and stores the extracted ATM cell in a transmission frame, and then stores the ATM cell in the transmission frame. It is converted into a signal and emitted from the output end. This output terminal has a plurality of output optical transmission lines 970-y (y = 1
To L) are connected.

In the third embodiment, an optical switch network 950 is provided for pass-through and insertion connections, and an optical switch network 951 is provided for branch and return connections.
, And each optical signal of passing and inserting or branching and returning is distributed to a predetermined output by an optical distribution switch network. As a result, unnecessary hardware can be reduced, and the size of the optical node can be reduced.

Next, the operation of the third embodiment will be described. For the sake of convenience, the signal from the optical communication network constituted by nodes will be described in the same manner as in the above embodiments. Sending to the other local network or regional network accommodated by its own node is called signal branching, and sending signals from these local or regional networks to the optical communication network is called signal insertion. Further, transferring an optical signal from an adjacent node in an optical communication network to another node is referred to as signal passing.

In FIG. 11, a wavelength-division multiplexed optical signal generated by multiplexing n optical signals (λ1 to λn) of different wavelengths has a wavelength-division multiplexed optical transmission path 900-X (X = 1 to M).
Are sent to the buffered wavelength division multiplexing reception interface 920-X (X = 1 to M). Buffered wavelength division multiplexing reception interface 920-X (X = 1 to M)
Are input ports 930- (Xn-n + 1) to 9
30-X · n (X = 1 to M), each of which is connected to the optical distribution switch network 940, so that the wavelength-division multiplexing reception interface with buffer 920-X (X = 1 to M)
After demultiplexing the input wavelength multiplexed optical signal into optical signals of n wavelengths, each of the n optical signals is divided into input ports 930- (Xn-n + 1) to 930-Xn. (X =
1 to M) to the optical distribution switch network 940.

Alternatively, each of the buffered wavelength division multiplexing reception interfaces 920-X (X = 1 to M) separates the input wavelength division multiplexed optical signal into n wavelength optical signals, and The ATM cell is extracted from the transmission frame for each optical signal, and input port 930- (X ·
n−n + 1) to 930−X · n (X = 1 to M) also sends out the optical cells to the optical switch distribution network 940. On the other hand, the buffered reception interface 922-Y (Y =
1 to L) are input optical transmission lines 960-Y (Y = 1 to
L), the ATM cell is extracted from the transmission frame and stored in the buffer, and then the ATM cell is input.
2-Y (Y = 1 to L) to Optical Distribution Switch Network 940
The optical cell is sent out.

The optical distribution switch network 940 includes a wavelength-division multiplexed reception interface with buffer 920-X (X = 1 to 1) input from the input ports 930-1 to 930-M · n.
M) and the input ports 932-1 to 932-
Buffered receiving interface 92 from L
The optical signal from 2-Y (Y = 1 to L) is switched to the optical switch networks 959 and 951.

The optical switch network 950 has a buffered wavelength division multiplexing reception interface 920-X (X = 1 to M).
When an optical signal is input without passing through a buffer inside the predetermined output ports 934-1 to 93-3
The optical signal is transmitted by switching the line to 4-M · n interchangeably. In addition, when an optical cell is input from the buffered reception interface 922-Y (Y = 1 to L), the optical switch network 950 operates as follows.
Switching from 22-Y (Y = 1 to L) to predetermined output ports 934-1 to 934-M · n for each cell in accordance with a switching control signal notified by a control line (not shown).

On the other hand, the optical switch network 951 has a buffered wavelength division multiplexing reception interface 920-X (X = 1
When an optical cell is input via a buffer in the multiplex receiving interface 920-X (X =
1 to M) according to a switching control signal notified by a control line (not shown).
Switch to 1-935-L for each cell. Further, when an optical cell is input from the buffered reception interface 922-Y (Y = 1 to L), the optical switch network 951 receives the buffered wavelength-division multiplexed reception interface 922.
A predetermined output port 93 according to the header of the cell notified from Y (Y = 1 to L) by a control line (not shown)
Switch from 5-1 to 935-L for each cell.

The wavelength multiplex transmission interface 921-X
(X = 1 to M) are also output ports 934- (X
N−n + 1) to 934−X · n (X = 1 to M) are connected to the optical switch network 950 in units of n. Each of the wavelength multiplexing transmission interfaces 921-X (X = 1 to M) has an output port 934- (Xn-n + 1) to 934.
-X · n (X = 1 to M) via the optical switch network 950
When an optical signal switched in a circuit-switched manner is input, the optical signal is converted into an optical signal having n wavelengths, and then the wavelength-multiplexed optical signal generated by multiplexing them is wavelength-multiplexed output optical transmission line 910-X. (X = 1 to M).

The wavelength division multiplexing transmission interface 921
Each of -X (X = 1 to M) is an output port 934- (X
When inputting optical cells switched by the optical switching network 950 on a cell-by-cell basis via (n-n + 1) to 934-X.n (X = 1 to M), these are inserted into the transmission frame every n units and n After the optical signals are converted into the optical signals of the wavelengths, a wavelength-division multiplexed optical signal generated by combining these is transmitted to the wavelength-division multiplexed output optical transmission line 910-X (X = 1 to M).

On the other hand, the transmission interface 923-Y (Y
= 1 to L) are output ports 935-Y (Y = 1 to L).
In L), the optical switch network 951 is connected. When each of the transmission interfaces 923-Y (Y = 1 to L) receives an optical cell switched for each cell by the optical switch network 951 via the output port 935-Y (Y = 1 to L), the transmission interface 923-Y (Y = 1 to L) After being inserted into the transmission frame, it is converted into an optical signal and transmitted to an output optical transmission line 970-Y (Y = 1 to L).

In FIG. 11, components having the same configuration as those applied to FIG. 1 can be applied to components having the same names as those in FIG. In the third embodiment of the present invention shown in FIG. 11, similarly to the first embodiment, the number of cross points required for the optical switch network can be reduced as compared with the related art. This is because a single optical switch network used in the conventional configuration realizes the connection functions of dropping / inserting, passing, and turning back a signal, whereas the third embodiment uses the passing and inserting functions. This is because the optical switch network 950 is used for connection, and the optical switch network 951 is used for branching and loopback connection. Therefore, the third embodiment of the present invention reduces the number of unnecessary cross points of the optical switch network corresponding to the space division equivalent circuit, and accordingly reduces the hardware corresponding to the unnecessary number of cross points. As a result, the size of the apparatus can be reduced.

Next, an optical communication network node according to a fourth embodiment of the present invention will be described. FIG. 12 is a block diagram showing the configuration of the fourth embodiment. In FIG. 12, a plurality of buffered wavelength division multiplexing reception interfaces 1020-x (x = 1 to M) are provided with a plurality of input optical transmission lines 1000-x (x = 1
1 to M) and input ports 1030-1 to 1030- of the optical distribution switch network 1040.
It has a plurality of outputs connected to the inputs of this light distribution switch network 1040 through M · n.

The wavelength-division-multiplexed reception interface with buffer 1020-x (x = 1 to M) splits the wavelength-division multiplexed optical signal input from one input terminal into a plurality of optical signals having different wavelengths, The optical signal is emitted as light from each of the plurality of output terminals, or the plurality of optical signals are converted into electric signals, and the ATM cells extracted from the transmission frame are temporarily stored in a buffer, and A
After processing the header of the TM cell, it is converted into an optical signal and emitted from each of the plurality of output terminals.

A plurality of buffered receiving interfaces 1022-Y (Y = 1 to L) are connected to one input terminal connected to a plurality of input optical transmission lines 1070-Y (Y = 1 to L) and one An AT having an output end, converting an optical signal incident from the input end into an electric signal, and extracting the electric signal from a transmission frame;
M cells are temporarily stored in a buffer, the header of an ATM cell output from the buffer is processed, then converted into an optical signal, and emitted from an output terminal. The output terminals of the plurality of buffered reception interfaces 1022-Y (Y = 1 to L) pass through the input ports 1032-1 to 1032-L of the optical distribution switch network 1040, and the input terminals of the optical distribution switch network 1040. It is connected to the.

The optical distribution switch network 1040 has a plurality of input terminals and a plurality of output terminals, and switches an optical signal from the plurality of input terminals to a predetermined output terminal. The output end of the optical distribution switch network 1040 is connected to the input ports 1031-1 to 1031-1 of the optical selection switch network 1050.
031-M · n, this optical selective switch network 1
050 input terminal. The output terminal of the optical distribution switch network 1040 is connected to the optical selection switch network 1.
051 are connected to the input terminals of the optical selective switch network 1051 through input ports 1033-1 to 1031-L.

The optical selection switch network 1050 and the optical selection switch network 1051 have a plurality of input terminals and a plurality of output terminals, and output optical signals from the plurality of input terminals to one or more predetermined output terminals. Branching selectively.
The output terminals of the optical selection switch network 1050 are connected to the optical switches 1060-1 to 106n and 1060- (Mn-n +
1) Each input port 1034-1 to 1060-M · n
1034− (M · n · n), 1034− {M · n (M−
n) +1} to 1034− (M · n) ² , and the optical switches 1060-1 to 106n and 1060− (M · n−n).
+1) to 1060 −M · n.

Optical switches 1060-1 to 106n, 10
Output ports 1035-1 to 1035-n, 1035- (M · n−n + 1) to 1060-M · n
n−n + 1) to 1035-M · n are connected to the respective input terminals of the wavelength division multiplexing transmission interfaces 1021-1 to 1021-M. WDM transmission interface 1021-1
-1021-M are connected to the wavelength multiplexed output optical transmission line 1
010-1 to 1010-1. The plurality of (M · n) × 1 optical switches 1060-p (p = 1 to M
(N) has a plurality of input terminals and one output terminal, and sets a predetermined optical line between a plurality of predetermined input terminals and one output terminal, or performs a plurality of buffered wavelength division multiplexing reception. Interface 1020-x (x = 1 to M) and a plurality of buffered receiving interfaces 1022-
Optical signals are exchanged for each cell under the control of y (y = 1 to L).

The wavelength division multiplexing transmission interface 102
1-X (X = 1 to M) has a plurality of input terminals and one output terminal, and converts each of the optical signals on the optical line incident from the plurality of input terminals into an optical signal of a predetermined wavelength as light. Alternatively, each of the optical signals from the plurality of input terminals is converted into an electric signal, the extracted ATM cell is stored in a transmission frame, and then converted into an optical signal of a predetermined wavelength, and converted to a predetermined wavelength. A plurality of optical signals are multiplexed and a wavelength multiplexed optical signal is output from one output terminal.

Furthermore, the optical selection switch network 105
1 output terminals are optical switches 1061-1 to 1061-L
Input ports 106-1 to 1036
L, and it is connected through ^{1036- (L 2 -L + 1)} ~1036-L 2. Optical switches 1061-1 to 1061
-L are connected to their output ports 1037-1 to 1037, respectively.
Transmission interface 1023-1 through 37-L
023-L is connected to each input terminal. Output terminals of the transmission interfaces 1023-1 to 1023-L are connected to output optical transmission lines 1080-1 to 1080-L.

The optical switches 1061-1 to 1061-
L has a plurality of input terminals and one output terminal as described above, and has a plurality of
020-X (X = 1 to M) and a plurality of buffered reception interfaces 1022-Y (Y = 1 to L) are used to exchange optical signals for each cell. Further, the transmission interfaces 1023-1 to 1023-L are:
As described above, each of the optical signals having one input terminal and one output terminal is converted into an electric signal from the input terminal, and the extracted ATM cell is stored in a transmission frame and then converted into an optical signal. A plurality of output optical transmission lines 1080-
The light is emitted through Y (Y = 1 to L).

Next, the operation of the fourth embodiment will be described. In the fourth embodiment, the optical selection switch network 1050 and the (Mn) X1 optical switch 1060
-P (P = 1 to M · n), or the optical selection switch network 1051 and the Lx1 optical switch 1061-Y (Y = 1 to
L) realizes an optical switch network for pass-through and insertion connection and an optical switch network for branch and return connection, respectively, to reduce the number of cross points, and each of the optical selective switch networks 1050 and 1051 , A predetermined (M · n) X1 optical switch 1060-P (P = 1 to M
N), LX1 optical switch 1061-Y (Y = 1 to L)
An unnecessary optical branch is also reduced by branching the optical signal to only the optical signal.

In the description of the fourth embodiment,
As in the description of each of the above embodiments, for convenience, sending a signal from an optical communication network constituted by nodes to other local networks or regional networks accommodated by the own node is referred to as signal branching, On the other hand, sending signals from these local networks and regional networks to the optical communication network is called signal insertion, and transmitting signals from adjacent nodes in the optical communication network to other nodes is called signal passing. Respectively.

Optical signals of n different wavelengths (λ1 to λn)
Are multiplexed and generated by the wavelength multiplexing input optical transmission line 1000-X (X = 1 to M).
Buffered wavelength multiplex receiving interface 1020-X
(X = 1 to M). Each of the buffered wavelength division multiplexing reception interfaces 1020-X (X = 1 to M)
Input port 1030- (Xn-n + 1) -1030-
X · n (X = 1 to M) are connected to the optical distribution switch network 1040 in units of n.

Each of the wavelength-division multiplexed receiving interfaces 1020-X (X = 1 to M) with a buffer demultiplexes the input wavelength-division multiplexed optical signal into optical signals of n wavelengths, and then demultiplexes these n optical signals. The signal is input to the input port 1030- (Xn-n
+1) to 1030-X.n (X = 1 to M) to the optical distribution switch network 1040. Alternatively, the buffered wavelength division multiplexing reception interface 1020-X (X = 1
To M), after demultiplexing the input wavelength-multiplexed optical signal into optical signals of n wavelengths, take out ATM cells from the transmission frame for each of the n optical signals, and input buffer 1030 via a buffer. − (X · n−n + 1) to 1030−x
· Optical distribution switch network 1 from n (X = 1 to M)
Send the optical cell to 040.

On the other hand, reception interface 1 with buffer
222-y (y = 1 to L) are input optical transmission lines 10
After receiving an optical signal from 70-y (y = 1 to L), extracting an ATM cell from the transmission frame and storing it in a buffer, the optical distribution switch network 1040 is input from the input port 1032-y (y = 1 to L). The optical cell is sent out. The optical distribution switch network 1040 receives the optical signals from the buffered wavelength division multiplexing reception interface 1020-X (X = 1 to M) and the buffered reception interface 1022-Y (Y = 1 to L) by using the input port 1031-P ( P = 1 to M · n)
And switching to the optical selection switch networks 1050 and 1051 via input ports 1033-Y (Y = 1 to L), respectively.

Optical selection switch network 1050, 1051
Respectively converts the input optical signals into predetermined (Mn) X1 optical switches 1060-P (P = 1 to M
n), or only to a predetermined LX1 optical switch 1061-Y (Y = 1 to L) among the L switches. (M
• n) X1 optical switch 1060-P (P = 1 to M · n)
Is a buffered wavelength division multiplexing reception interface 1020
-Input ports 1034-(P.M.n-M.n + 1) to 1034- without passing through a buffer in X (X = 1 to M)
Any one of the optical signals incident from P.M.n (P = 1 to M.n) is output to an output port 1035-p (P = 1 to M.n).
Switch to circuit switching to n).

The (M · n) X1 optical switch 1060−
P (P = 1 to M · n) is input from the receiving interface with buffer 1022-Y (Y = 1 to L) to the input port 103.
4-P (PMn-Mn + 1) to 1034-PM
The optical cell incident via n (P = 1 to M · n) is converted into a buffered reception interface 1022-Y (Y = 1 to
L) according to a switching control signal notified by a control line (not shown).
1 to M · n) for each cell.

On the other hand, the Lx1 optical switch 1061-y (y
= 1 to L) are input ports 1036- (y · L−L + 1) to 1036-y · via buffers in the buffered wavelength division multiplexing reception interface 1020-X (X = 1 to M).
The optical cell incident from L (y = 1 to L) is converted into a buffered wavelength division multiplexing reception interface 1020-X (X = 1 to L).
M) according to a switching control signal notified by a control line (not shown).
1 to L) for each cell. Further, the LX1 optical switch 1061-Y (Y = 1 to L) is connected from the buffered reception interface 1022-Y (Y = 1 to L) to the input port 1036- (Y · L−L + 1) to 1036-Y.
The optical cell incident via L (Y = 1 to L) is converted into a buffered receiving interface 1022-Y (Y = 1 to L).
Output port 1037-Y (Y = 1 to 10) in accordance with a switching control signal notified from a control line (not shown).
Switch to L) for each cell.

The wavelength multiplexing transmission interface 1021-X
Each of (X = 1 to M) is an output port 1035- (X · n
−n + 1) to 1035−X · n (X = 1 to M), and (M · n) X1 optical switches 1050-P (P = 1 to
M.n). Each of the wavelength division multiplexing transmission interfaces 1021-X (X = 1 to M) is (M · n) X
The optical signal is output to the output ports 1035- (Xn-n + 1) to 1035-X by switching the line interchangeably by one optical switch 1050-P (P = 1 to M · n).
n (X = 1 to M), the signals are converted into optical signals of n wavelengths, and then these are combined to generate a wavelength multiplexed optical signal, which is then output to a wavelength multiplexed output optical transmission line 1010-X.
(X = 1 to M). Each of the wavelength multiplexing transmission interfaces 1021-X (X = 1 to M) is (M ·
n) The optical cell switched for each cell by the X1 optical switch 1050-P (P = 1 to M · n) is output port 1
035- (Xn-n + 1) to 1035-Xn (X =
1 to M), these are inserted into the transmission frame every n units, converted into optical signals of n wavelengths, and then multiplexed to generate a wavelength-division multiplexed optical signal. It is sent to the path 1010-X (X = 1 to M).

On the other hand, the transmission interface 1023-Y
(Y = 1 to L) are output ports 1037-Y (Y
= 1 to L) and the LX1 optical switch 1061-Y (Y = 1 to L)
L) is connected. Therefore, each of the transmission interfaces 1023-Y (Y = 1 to L) outputs the optical cell switched for each cell by the LX1 optical switch 1061-Y (Y = 1 to L) to the output port 1037-Y (Y = 1).
To L), the cell is inserted into the transmission frame, converted to an optical signal, and output to the optical transmission line 1080-Y (Y =
1 to L).

In FIG. 12, components having the same configuration as those applied to FIG. 7 can be applied to components having the same names as those in FIG. In the optical communication network node according to the fourth embodiment shown in FIG. 12, as in the optical communication network node according to the second embodiment, the number of cross points required for the optical switch network is reduced as compared with the related art. And light loss can be reduced.

This is because the optical selective switch network 1050 and the (M · n) X1 optical switch 1060, or the optical selective switch network 1051 and the LX1 optical switch 1061, are used for passing and inserting connection. Optical switch networks are realized respectively for branch and return connections, and optical selective switch networks 1050, 1051
Each is a predetermined (M · n) X1 optical switch 1060, L
This is because the optical signal is branched only to the X1 optical switch 1061-Y (Y = 1 to L).

Next, a fifth embodiment of the present invention will be described with reference to FIGS. FIG. 13 is a block diagram showing the configuration of the fifth embodiment. This FIG.
, A plurality of input optical transmission lines 2100-X to which wavelength-division multiplexed optical signals are input are provided to input ends of a plurality of buffered wavelength-division multiplexing reception interfaces 2120-X (X = 1 to M).
(X = 1 to M) are connected. The output terminal of the buffered wavelength division multiplexing reception interface 2120-X (X = 1 to M) is connected to the input terminal of the optical switch network 2140 and its input ports 2130-1 to 2130n and 2130- (M ·
n−n + 1) to 2130−M · n. Further, the output terminal of the buffered wavelength division multiplexing reception interface 2120-X (X = 1 to M) is connected to the input port 21321 to 2132 of the optical switch network 2141.
−n, 2132− (M · n−n + 1) to 2132−M ·
n is connected to the input terminal of the optical switch network 2141 through n.

The buffered wavelength division multiplexing receiving interface 2120-X (X = 1 to M) demultiplexes the wavelength division multiplexed optical signal input from the input terminal into a plurality of optical signals having different wavelengths, The signal is emitted from each of the first output terminals as light, or the optical signal is converted into an electric signal, and the ATM cell extracted from the transmission frame is temporarily stored in a buffer, and the header of the ATM cell output from the buffer is output. Is converted into an optical signal and emitted from each of the plurality of second output terminals.

Further, a plurality of input optical transmission lines 2160-Y (Y = 1 to L) are connected to input terminals of the plurality of receiving interfaces with buffers 2122-Y (Y = 1 to L). Buffered reception interface 2122-Y
(Y = 1 to L) output terminals are optical splitters 2160-1 to 2160-1
1261-L and an input terminal of an optical switch network 2141 are connected through input ports 2124-1 to 2134-L of the optical switch network 2141.
261-L and input port 2 of the optical switch network 2143
Through 136-1 to 2136-L, they are connected to their input terminals.

Receive interface with buffer 2122
-Y (Y = 1 to L) is an ATM converted from an optical signal incident from an input terminal into an electric signal and extracted from a transmission frame.
The cells are temporarily stored in a buffer, the header of an ATM cell output from the buffer is processed, then converted into an optical signal, and emitted from an output terminal.

The output terminal of the optical switch network 2140 is connected to output ports 213-1 to 2131-n and 2131-.
They are connected to the input terminals of the wavelength division multiplexing transmission interfaces 2121-1 to 2121-M through (Mn-n + 1) to 2131-Mn. The optical switch network 2141
Is connected to the input terminals of the transmission interfaces 213-1 to 2123-L through the output ports 2133-1 to 2133-L and the optical multiplexers 2170-1 to 2170-L. The output terminal of the optical switch network 2142 is connected to the input terminals of the transmission interfaces 213-1 to 2123-L through the output ports 2135-1 to 2135-L and the optical couplers 2170-1 to 2170-L. .

The output terminals of the optical switch network 2143 are connected to the output ports 2137-1 to 2137-n, 2137-n.
37- (Mn-n + 1) to 2137-Mn and the wavelength division multiplexing transmission interfaces 2121-1 to 2121-
M is connected to the input terminal. The output terminals of the wavelength multiplex transmission interfaces 2121-1 to 2121-M are connected to wavelength multiplex transmission output optical transmission lines 2110-1 to 2110-M. Transmission interfaces 213-1 to 212
The output end of 3-L is connected to output optical transmission lines 2180-1 to 218
0-L.

The optical switch network 2140 sets up a predetermined optical line between a plurality of predetermined input terminals and an output terminal. 212
Optical signals are exchanged for each cell under the control from 0-X (X = 1 to M). The optical switch network 21
Reference numerals 42 and 2143 exchange optical signals for each cell under the control of a plurality of buffered reception interfaces 122-y (y = 1 to L).

The plurality of wavelength multiplex transmission interfaces 2
121-X (X = 1 to M) converts each of the optical signals on the optical line incident from the plurality of first input terminals into an optical signal of a predetermined wavelength as it is, or AT that converts each optical signal from the input terminal of the
After the M cell is stored in the transmission frame, it is converted into an optical signal of a predetermined wavelength, and a plurality of optical signals converted to the predetermined wavelength are multiplexed and output from the output terminal. The plurality of transmission interfaces 2123-Y (Y = 1 to L)
Each of the optical signals input from the input terminal is converted into an electric signal, and the extracted ATM cell is stored in a transmission frame, converted into an optical signal, and emitted from the output terminal.

Next, the operation of the fifth embodiment configured as described above will be described. In the fifth embodiment, the optical switch networks 2140, 21
41, 2142, and 2143 are provided, and hardware corresponding to the number of cross points corresponding to each connection function is prepared according to the ratio of each connection. As a result, unnecessary hardware can be reduced, and the size of the optical node can be reduced.

In the following description, as in the above-described embodiments, for the sake of convenience, it is assumed that a signal from an optical communication network composed of nodes is transmitted to another local network or regional network accommodated by the own node. The transmission of signals from these local networks and regional networks to the optical communication network is called signal insertion, and the transmission of optical signals from adjacent nodes in the optical communication network to other nodes. This is referred to as signal passage.

Optical signals of n different wavelengths (λ1 to λn)
Are multiplexed and generated by the wavelength multiplexing input optical transmission line 2100-X (X = 1 to M), respectively.
Buffered wavelength multiplex reception interface 2120-X
(X = 1 to M). Each of the buffered wavelength multiplex reception interfaces 2120-X (X = 1 to M)
Input port 2130- (Xn-n + 1) to 2230-
X · n (X = 1 to M) by n optical switch networks 2
140 and the input port 2132- (Xn
−n + 1) to 2132−X · n (X = 1 to M) are connected to the optical switch network 2141 in units of n.

Each of the buffered wavelength division multiplexing reception interfaces 2120-X (X = 1 to M) demultiplexes the input wavelength division multiplexed optical signal into n wavelength optical signals, and thereafter, these n respective optical signals are demultiplexed. The signal is input to the input port 2130- (Xn-n
+1) to 2130-X · n (X = 1 to M) to the optical switch network 2140. Alternatively, the buffered wavelength division multiplexing reception interface 2120-X (X = 1 to
M) demultiplexes the input wavelength-division multiplexed optical signal into n wavelength optical signals, extracts ATM cells from the transmission frame for each of the n optical signals, and inputs the ATM cells via a buffer to the input port 2132. (X · n−n + 1) to 2132−X ·
An optical cell is transmitted from n (X = 1 to M) to the optical switch network 2141.

On the other hand, buffered reception interface 2
Each of the input optical transmission lines 21-Y (Y = 1 to L)
An optical signal from 50-Y (Y = 1 to L) is received, an ATM cell is extracted from the transmission frame, stored in a buffer, and then input to port 2134- via optical splitter 2160-Y (Y = 1 to L). Y (Y = 1 to L) or input port 2
136-Y (Y = 1 to L) to the optical switch network 214
2 and 2143, respectively. When an optical signal is input without passing through a buffer in the buffered wavelength division multiplexing reception interface 2120-X (X = 1 to M), the optical switch network 2140 determines a predetermined output port 2131-1 to 213 to 1 in advance. The optical signal is switched to 2131-M · n in a circuit switching manner.

The optical switch network 2141 has a buffered wavelength division multiplexing reception interface 2120-X (X
= 1 to M), the optical cell is input via the buffer.
Buffered wavelength multiplex reception interface 2120-X
(X = 1 to M) according to a switching control signal notified by a control line (not shown).
133-Y (Y = 1 to L) is switched for each cell.
When an optical cell is input from the buffered reception interface 2122-Y (Y = 1 to L), the optical switch network 2142 switches to the wavelength-division multiplexed reception interface 2 with buffer.
Switching from 122-Y (Y = 1 to L) to a predetermined output port 2135-Y (Y = 1 to L) is performed for each cell according to the header of the cell notified by a control line (not shown).

When an optical cell is input via a buffer in the buffered reception interface 2122-Y (Y = 1 to L), the optical switch network 2143 changes to the buffered reception interface 2122-Y (Y = 1 to L). ) According to a switching control signal notified by a control line (not shown).
Switch to M · n for each cell. Each of the wavelength multiplexing transmission interfaces 2121-X (X = 1 to M) is also an output port 2131- (Xn-n + 1) to 2131-X
· N (X = 1 to M) n and output port 213
7- (Xn-n + 1) to 2137-Xn (X = 1 to
M) optical switch networks 2140, 2143 by n
Are connected to each other.

Wavelength multiplex transmission interface 2121-X
(X = 1 to M) are each equal to the output port 2131- (X ·
When inputting optical signals switched circuit-switched from the optical switch network 2140 via (n−n + 1) to 2131−X · n (X = 1 to M), these are converted into optical signals of n wavelengths. Later, the wavelength-division multiplexed optical signal generated by multiplexing them is converted into a wavelength-division multiplexed output optical transmission line 2110-X (X = 1 to
M). In addition, the wavelength multiplex transmission interface 2
Each of 121-X (X = 1 to M) is an output port 213
7- (Xn-n + 1) to 2137-Xn (X = 1 to
When optical cells switched on a cell-by-cell basis are inputted from the optical switch network 2143 via M), these are inserted into the transmission frame every n units, converted into optical signals of n wavelengths, and then multiplexed. The wavelength multiplexed optical signal thus generated is transmitted to the wavelength multiplexed output optical transmission line 2110-X (X = 1 to M).

On the other hand, the transmission interface 2123-Y
(Y = 1 to L) are each a merging device 2170-Y (Y = 1).
Through L) to output ports 2133-Y and 2135-Y
(Y = 1 to L) and optical switch networks 2141 and 2142
Are connected to each other. Transmission interface 2123
Each of Y (Y = 1 to L) is an optical switch network 214
When an optical cell switched for each cell is input from 1, 2142, the cell is inserted into a transmission frame, converted into an optical signal, and transmitted to an output optical transmission line 2180-Y (Y = 1 to L).

Next, a detailed configuration of each unit in the fifth embodiment shown in FIG. 13 will be described. For example, the optical switch network 3400 in FIG. 17 can be applied to the optical switch networks 2140 to 2143 in FIG. In this case, the optical switch networks 2140, 2140 of FIG.
141, 2142, and 2143 are input ports 213, respectively.
0, 2132, 2134, 2136 and output port 213
With the addition or reduction of n units of 1, 2133, 2135, and 2137, the addition or reduction of the optical sub-switch module 3401-K (K = 1 to N) in FIG. 17 is possible.

In the present invention, the specific configuration of the optical switch networks 2140 to 2143 in FIG. 13 is not limited to only the optical switch network 2400 in FIG.
The above document `` Optical Path Cross-Connect Node Arch
itecture with High Modularity for Photonic T
The network described in "ransport Networks" (Fig. 6) is also applicable. In this case, the optical switch network 214
0, 2141, 2142, and 2143 are hardware components of a required optical switch network with the addition or reduction of one input port path 2130, 2132, 2134, 2136 and one output port 2131, 2133, 2135, 2137, respectively. Expansion or reduction is possible.

Further, the receiving interface with buffer 2122 and the transmitting interface 2123 in FIG. 13 are respectively the receiving interface with buffer 3600 having the configuration shown in FIG. 20 (same configuration as in FIG. 4) and FIG. 21 (same configuration as in FIG. 5). , Transmission interface 3601 can be applied. The detailed configurations of the buffered wavelength division multiplexing reception interface 2120 and the wavelength division multiplexing transmission interface 2121 of FIG. 13 are shown in FIGS.

As shown in FIG. 14, the wavelength-division-multiplexed receiving interface 2200 with a buffer is composed of the wavelength-division-multiplexed input optical transmission line 2100-X (X = 1 to M) and the input terminal 22 shown in FIG.
10 are connected to the input ports 2130- (Xn-n + 1) to 2130-Xn of the optical switch network 2140.
(X = 1 to M) are output terminals 2211-Z (Z = 1).
To n), and input ports 2132- (Xn-n + 1) to 2132- of the optical switch network 2141.
Each of X · n (X = 1 to M) is an output terminal 2290-Z
(Z = 1 to n).

The wavelength division multiplexer 2220 is connected to the input terminal 22
The wavelength division multiplexed signal from 10 is split into optical signals of n wavelengths, and each is sent to an optical switch 2230-Z (Z = 1 to n). When the optical switch 2230-Z (Z = 1 to n) causes the optical signal to be switched by the optical switch network 2140, the optical switch 2240-Z, the cell extraction circuit 2250-Z, and the buffer 2260- Z, routing table 2270-Z, electro-optical converter 2280-Z (Z
= 1 to n) to make the output terminal 22 a shortcut
Switch to 11-Z (Z = 1 to n).

Alternatively, the optical switch 2230-Z (Z =
1 to n) buffer the input optical signal in the buffer 260-Z (Z
= 1 to n) and when performing ATM exchange with the optical switch network 2141 in FIG.
Switch to 240-Z (Z = 1 to n). The photoelectric converter 2240-Z (Z = 1 to n) is a wavelength division multiplexer 2220.
The optical signal of each predetermined wavelength is converted into an electrical signal once, and the cell extraction circuit 2250-Z (Z
= 1 to n).

Cell take-out circuit 2250-Z (Z = 1 to 2)
n) is a photoelectric converter 2240-Z (Z = 1 to n), respectively.
, The cell is extracted from the transmission frame, and the cell is transmitted to the buffer 2260-Z (Z = 1 to n). Buffer 2260-Z (Z = 1 to n) temporarily stores input cells, for example,
First out routing table 2270-Z
(Z = 1 to n).

The routing table 2270-Z (Z =
1 to n) analyze the header of the cell from the buffer 2260-Z (Z = 1 to n) and determine the output port 2133-Y (Y = 1 to L) of the optical switch 2141 to be output from this. , The header is rewritten to a predetermined value,
280-Z (Z = 1 to n). Further, the routing table 2270-Z (Z = 1 to n) notifies the optical switch network 2141 of the output port of the optical cell for switching control of the optical switch network 2141. Each of the electro-optical converters 2280-Z (Z = 1 to n) converts a cell from the routing table 2270-Z (Z = 1 to n) into an optical cell, and outputs the output terminal 2290-Z (Z = 1 to n). ).

As described above, the wavelength-division-multiplexed reception interface with buffer 2200 outputs the n optical signals multiplexed to the wavelength-division multiplexed signal from the input terminal 2210 as output signals 2211-Z (optical signals without passing through the buffer). Z = 1 ~
n) or after each conversion to an electrical signal, cells can be taken out of the transmission frame and temporarily stored in a buffer before being output to output terminals 2290-Z (Z = 1 to n).

On the other hand, as shown in FIG. 15, the wavelength multiplexing transmission interface 2201 is connected to the optical switch network 2 of FIG.
140 output ports 2131- (Xn-n + 1) to 2
131-X · n (X = 1 to M) are input terminals 212
-Z (Z = 1 to n) and the optical switch network 21
43 output ports 2137- (Xn-n + 1) to 21
37-X · n (X = 1 to M) are input terminals 2221
−Z (Z = 1 to n), and the wavelength multiplexed output optical transmission line 110 -X (X = 1 to M) and the output terminal 2213 are connected.

The optical signal switched by the optical switch network 2140 is input to the wavelength converter 2271-Z. The wavelength converter 2271-Z (Z = 1 to n) is connected to the input terminal 22.
The optical signal from 12-Z (Z = 1 to n) is converted into an optical signal of a predetermined wavelength λZ (Z = 1 to n), and the optical signal is passed through an optical combiner 2261-Z (Z = 1 to n). Output to the wavelength multiplexer 2281. Buffered receiving interface 2122-y (y = 1 to L) and optical switch network 214
The optical signal exchanged by the ATM in step 3 is input to the photoelectric converter 231-z of the photoelectric conversion and electro-optical conversion system.

Photoelectric converter 2231-Z (Z = 1 to n)
Converts the optical cell from the input terminal 2221-Z (Z = 1 to n) into an electric signal, and outputs the signal to the cell insertion circuit 2241-Z (Z =
1 to n). Cell insertion circuit 2241-Z (Z = 1 to
n) is a photoelectric converter 2231-Z (Z = 1 to n), respectively.
Are inserted into the transmission frame, and sent to the electro-optical converter 2251-Z (Z = 1 to n).

Electro-optical converter 2251-Z (Z = 1 to n)
Converts the electric signals from the cell insertion circuits 2241 -Z (Z = 1 to n) into optical signals of predetermined wavelengths λ1 to λn, respectively, via the optical combiners 2261 -Z (Z = 1 to n). Output to the wavelength multiplexer 2281. Wavelength multiplexer 2
281 is a signal of n wavelengths from the electro-optical converter 2251-Z (Z = 1 to n) or a wavelength converter 2271-Z.
The optical signals from (Z = 1 to n) are multiplexed, and the wavelength multiplexed signal is transmitted to the output terminal 2213.

As described above, the wavelength division multiplexing transmission interface 2201 is connected to the input terminal 2212-Z (Z = 1 to n).
Is converted into an optical signal of predetermined n wavelengths as light, or the input terminal 221-Z
After converting the optical signal from (Z = 1 to n) into an electric signal, each cell is inserted into a transmission frame and converted into an optical signal of predetermined n wavelengths, and the wavelength multiplexed signal is output to an output terminal 2213. Output. As described above, in the fifth embodiment of the present invention, the configuration of which is shown in FIG. 13, the arbitrary wavelengths transmitted on any wavelength-multiplexed input optical transmission line 2100-X (X = 1 to M) Can be branched to an arbitrary output optical transmission line 2180-Y (Y = 1 to L).

Further, according to the fifth embodiment, a cell from an arbitrary input optical transmission line 2150-Y (Y = 1 to L) is converted into an optical signal of an arbitrary wavelength and a wavelength multiplexed output signal is output. It can be inserted into the optical transmission line 2110-X (X = 1 to M). Further, the node according to the fifth embodiment converts an optical signal of an arbitrary wavelength of an arbitrary wavelength multiplexed input optical transmission line 2100-X (X = 1 to M) into an arbitrary wavelength multiplexed output optical transmission line 110.
By converting the signal into an optical signal having an arbitrary wavelength of -X (X = 1 to M), the optical signal can be passed between the wavelength multiplexed input / output optical transmission lines, and the arbitrary input optical transmission line 2150- Y
(Y = 1 to L) and an arbitrary output optical transmission line 2180-Y (Y
= 1 to L) is also possible.

When the optical communication network node of the fifth embodiment is analyzed by a space division equivalent circuit, the number of cross points required for an optical switch network can be reduced as compared with the related art. This is because a single optical switch network used in the conventional configuration realizes each connection function of dropping / inserting, passing, and returning a signal. In the fifth embodiment, an optical switch network is used for each connection function. This is because the switch network is divided. For example, M = 8, n = 8, L = 6
In the case of 4, the space division equivalent circuit of the optical switch network 3340 always requires (M · n + L) 2 = 1282 = 16384 cross points even if the ratio of each connection changes in the conventional configuration of FIG. .

On the other hand, in the fifth embodiment, all the optical signals from the M wavelength-multiplexed input optical transmission lines 2100 are branched into nodes, and the input optical transmission line 2150 Consider the case where all the optical signals from are transmitted to the M wavelength-multiplexed output optical transmission lines 2110. However, it is assumed that symmetric traffic (M · n = L) in which the total amount of the optical signal to be dropped and that to be inserted is the same. In this case, the optical switch networks 2140 and 21
Only the number of cross points of the optical switch networks 2141 and 2143 excluding 42 is necessary. When each optical switch network is also analyzed by a space division equivalent circuit, both the optical switch networks 2141 and 2143 have (n · M) · L = 4096. The number of cross points is required, and the total number of required cross points is 8,192, which can be reduced to half of the conventional number.

Next, there are no optical signals to be branched, and all the optical signals from the M wavelength-multiplexed input optical transmission lines 2100 are passed to the M wavelength-multiplexed output optical transmission lines 2110, and from the input optical transmission line 2150. Are all output optical transmission lines 2180
Consider the case where it is connected back to. In this case,
Only the number of cross points of the optical switch networks 2140 and 2142 is required. When each optical switch network is also analyzed by a space division equivalent circuit, the optical switch network 2140 has (n · M) 2 = 4096 optical switch networks 2142
Requires L2 = 4096 cross points,
The total number of required cross points is 8192, which is 1 /
It can be reduced to 2.

Further, the M wavelength-multiplexed input optical transmission lines 21
Half of the optical signal from 00 is M1 = 4, which is connected to the wavelength multiplexed output optical transmission line 2110, the remaining M2 = 4 (M1 + M2 = M) is branched to the node, and L input optical transmissions are performed. L1 = 32 which is half of the optical signal from the path 2150
A case will be considered where a book is inserted into the wavelength multiplexed output optical transmission line 2110 and the remaining L2 = 32 (where L1 + L2 = L) is connected back to the output optical transmission line 2180. Again, assuming symmetric traffic, M2 · n = L1.
In this case, the optical switch networks 2140, 2141,
When all the optical switch networks 2142 and 2143 are used and each optical switch network is also analyzed by a space division equivalent circuit, the optical switch network 2140 has (n · M1) 2 = 1024 and the optical switch network 2141 has (n · M2 · 2). L1) 2 = 1024
L22 = 1024 optical switch networks 2142,
The optical switch network 2143 is (nM2L1) 2 = 1
A total of 024 cross points are required, and the total number of required cross points is 4096, which can be reduced to 1/4 of the conventional number.

Therefore, in the fifth embodiment,
The number of unnecessary cross points of the optical switch network is reduced by the equivalent of the space division equivalent circuit, and accordingly, the hardware corresponding to the number of unnecessary cross points is reduced, and the size of the device can be reduced. As is clear from the above, in the fifth embodiment, since the optical switch network is divided for each connection function in the optical node, the number of cross points of the optical switch network that does not contribute to the connection to be realized is calculated. Thus, the number of required cross points of the optical switch network can be reduced, and the size and cost of the device can be reduced.

[0197]

As described in detail above, according to the first aspect, the optical switch network for passing and branching connection and the optical switching network for insertion and return connection are divided. The number of cross points of the optical switch network that does not contribute to the connection to be realized can be reduced, the required number of cross points of the optical switch network can be reduced, and the size and cost of the device can be reduced. According to the second invention, the optical selective switch network and the (M · n) X1 optical switch, or another optical selective switch network and the LX
One optical switch realizes an optical switch network for passing and branch connection and an optical switch network for insertion and return connection, respectively, and each of the optical selective switch networks has a predetermined (M · n) X1 light. Since the optical signal is branched only to the switch and the LX1 optical switch, the number of required cross points of the optical switch network can be reduced, and the device can be reduced in size and cost, and the optical loss can be reduced. Is possible. Further, according to the third invention,
Since the optical switch network for passing and inserting connection and the optical switch network for branching and return connection are divided, the number of cross points of the optical switch network that does not contribute to the connection to be realized can be reduced. The required number of cross points in the optical switch network can be reduced, and the size and cost of the device can be reduced. According to the fourth invention, the optical selective switch network and the (M · n) X1 optical switch, or another optical selective switch network and the optical switch network for passing and inserting connection by the LX1 optical switch are provided. An optical switch network is realized for branching and return connection, and each optical selective switch network splits an optical signal only to a predetermined (M · n) X1 optical switch and LX1 optical switch. In addition, the required number of cross points of the optical switch network can be reduced, the size and cost of the device can be reduced, and the optical loss can be reduced. According to the fifth aspect, since the optical switch network is divided for each connection function in the optical node, the number of cross points of the optical switch network that does not contribute to the connection to be realized can be reduced, and the size of the device can be reduced. And low cost are possible.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an optical communication network node according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a wavelength-division multiplex receiving interface with a buffer used in the first embodiment and the second embodiment of the optical communication network node of the present invention.

FIG. 3 is a block diagram showing a configuration of a wavelength division multiplexing transmission interface used in the first embodiment and the second embodiment of the optical communication network node of the present invention.

FIG. 4 is a block diagram showing a configuration of a buffered reception interface used in the first and second embodiments of the optical communication network node of the present invention.

FIG. 5 is a block diagram illustrating a configuration of a transmission interface used in the first and second embodiments of the optical communication network node of the present invention.

FIG. 6 is a block diagram showing a configuration of an optical switch network used in the first embodiment of the optical communication network node of the present invention.

FIG. 7 is a block diagram illustrating a configuration of an optical communication network node according to a second embodiment of the present invention;

FIG. 8 is a circuit diagram showing a configuration of an optical selective switch network used in a second embodiment of the optical communication network node of the present invention.

FIG. 9 is a block diagram for explaining an example of the operation of the optical communication network node according to the second embodiment of the present invention;

FIG. 10 shows a second example of the optical communication network node of the present invention.
FIG. 21 is a block diagram for explaining another operation of the embodiment.

FIG. 11 shows a third example of the optical communication network node according to the present invention.
FIG. 3 is a block diagram showing a configuration of the embodiment.

FIG. 12 shows a fourth example of the optical communication network node according to the present invention;
FIG. 3 is a block diagram showing a configuration of the embodiment.

FIG. 13 is a fifth diagram of the optical communication network node according to the present invention;
FIG. 3 is a block diagram showing a configuration of the embodiment.

FIG. 14 is a fifth diagram of the optical communication network node according to the present invention;
It is a block diagram which shows the structure of the wavelength multiplex reception interface with a buffer used for 1st Embodiment.

FIG. 15 shows a fifth example of the optical communication network node according to the present invention;
FIG. 3 is a block diagram showing a configuration of a wavelength division multiplexing transmission interface used in the embodiment.

FIG. 16 is a block diagram showing a configuration of a conventional optical communication network node.

FIG. 17 is a block diagram illustrating a configuration of an optical switch network used in the conventional and optical communication network nodes of the present invention.

FIG. 18 is a block diagram illustrating a configuration of a buffered wavelength division multiplexing reception interface used in a conventional optical communication network node.

FIG. 19 is a block diagram illustrating a configuration of a wavelength multiplex transmission interface used in a conventional optical communication network node.

FIG. 20 is a block diagram showing a configuration of a receiving interface with a buffer used in the fifth embodiment of the conventional and optical communication network nodes of the present invention.

FIG. 21 is a block diagram showing a configuration of a transmission interface used in the fifth embodiment of the conventional and optical communication network nodes of the present invention.

[Explanation of symbols]

100-1 to 100-M, 500-1 to 500-M, 7
00-1 to 700-M, 800-1 to 800-M, 90
0-1 to 900-M, 1000-1 to 1000-M, 1
100-1 to 1100-M, 2100-1 to 2100M
... WDM input optical transmission line, 110-1, 510-1,.
710-1, 710-2, 810-1, 810-2, 9
10-1,1010-1,2110-1 to 2110-M
... WDM output optical transmission line, 120-1 to 120-M,
200, 520-1 to 520-M, 720-1, 720
-2,820-1,820-2,920-1 to 920-
M, 1020-1 to 102-M, 2120-1 to 212
0-M: Buffered wavelength division multiplexing reception interface
121-1 to 121-M, 201, 521-1 to 521
-M, 721-1, 721-2, 821-1, 821-
2,921-1 to 921-M, 1021-1 to 1021
-M, 2121-1 to 2121-M, 2201 ... wavelength multiplex transmission interface, 122-1 to 122-M, 3
00, 522-1 to 522-L, 722-1 to 722
6,822-1 to 822-6,922-2 to 922
L, 1022-1 to 1022-L, 2122-1 to 21
22-L, 3600 ... Reception interface with buffer, 123-1 to 123-L, 301, 523-1 to 5-3
23-L, 723-1 to 723-6, 823-1 to 82
3-6, 923-1 to 923-L, 1023-1 to 10
23-L, 2123-1 to 2123-L, 3601 ...
Transmission interface, 130-1 to 130-M · n, 1
32-1 to 132-L, 530-1 to 530-M · n,
531-1 to 531- (Mn) ² , 533-1 to 53
^{3-L 2, 930-1~930-M} · n, 931-1~
931-M · n, 932-1 to 932-1, 933-1
933-L, 1030-1 to 1030-M · n, 10
31-1 to 1031-M · n, 1032-1 to 1032
-L, 1033-1 to 1033-L, 1034-1 to 1
034- (M · n) ² , 106-1 to 1036-L ² ,
2130-1 to 2130-M · n, 21321 to 21-21
32-M · n, 2134-1 to 2134-L... Input ports, 131-1 to 131-M · n, 133-1 to 13-13
3134-1 to 134-M · n, 135-1 to 135-
L, 534-1 to 534-M · n, 535-1 to 535
−M · n, 536-1 to 536-L, 537-1 to 53
7-L, 934-1-934-M · n, 935-1-
935-L, 1035-1 to 1035-M · n, 103
7-1 to 1037-L, 2131-1 to 2131-M
n, 2133-1 to 2133-M · n, 2135-1 to
2135-L, 2137-1 to 2137-M · n output port, 140, 141, 400, 950, 951,
2140 to 2143: optical switch network, 150, 5
60, 760, 860, 940, 1040... Optical distribution switch network, 160-1 to 160-L, 570-1 to
570-L, 770-1 to 770-6, 870-1 to 8
70-6, 960-1 to 960-L, 1070-1 to 1
070-L, 2122-1 to 2122-L ... input optical transmission line, 170-1 to 170-L, 580-1 to 580-
L, 780-1 to 780-6, 880-1 to 880-
6,970-1 to 970-L, 2180-1 to 2180
-L: output optical transmission line, 220: wavelength division multiplexer, 2
21-1 to 221-n, 230-1 to 230-n, 43
0-1 to 430-N, 550-1 to 550-M · n, 5
51-1 to 551-L, 620-1 to 620-R, 74
0-1 to 740-6, 741-1 to 741-6, 750
-1 to 750-6, 751-1 to 751-6, 840-
1-840-6, 841-1 to 841-6, 850-1
~ 850-6,851-1 ~ 851-6,1060-1
-1060-M · n, 1061-1 to 1061-L ...
Optical switch, 231-1 to 231-n, 240-1 to 2
41-n, 320, 321, 223-1 to 2231-
n, 2240-1 to 2240-n... photoelectric converter, 2
41-1 to 241-n, 331, 241-1 to 224
1-n... Cell insertion circuits, 250-1 to 2501-n,
2250-1 to 2250-n, 330... Cell extraction circuit, 251-1 to 251-n, 280-1 to 280-
n, 341,360,2251-1 to 2251-n, 2
280-1 to 2280-n... Electro-optical converter, 260-
1-260-n, 340, 260-1-2260-n ...
... Buffers, 270-1 to 270-n, 350, 227
0-1 to 2270-n... Routing table, 27
1-1 to 271-n, 227-1 to 2271-n ...
Wavelength converter, 281, 281... Wavelength multiplexer, 40
1 ... optical sub-switch module, 420, 2160-
1-2160-n optical splitters 540, 541, 60
0,730,731,830,831,1050,10
51 ... optical selection switch network.

Claims (14)

(57) [Claims] 1. An optical communication network node having both an ATM switching function for exchanging ATM cells and an optical switching function for exchanging optical signals as light, comprising: one input terminal and a plurality of output terminals; After demultiplexing the wavelength-division multiplexed optical signal incident from the one input end through each of the first input optical transmission lines into a plurality of optical signals having different wavelengths, A is output from each of the output terminals, or the plurality of optical signals are converted into electrical signals and extracted from the transmission frame.
A plurality of buffered wavelength division multiplexing receiving interfaces for temporarily storing TM cells in a buffer, processing ATM cell headers output from the buffer, converting the ATM cells into optical signals, and outputting the optical signals from each of the plurality of output terminals; An ATM cell having one input terminal and one output terminal, converting an optical signal incident from the input terminal through each of the plurality of second input transmission lines into an electric signal, and extracting the ATM cell from the transmission frame into a temporary buffer; A plurality of buffered reception interfaces for storing and processing the header of the ATM cell output from the buffer, converting the header into an optical signal, and outputting the optical signal from the output end; and a plurality of input ends and one output end; Either convert each optical signal on the optical line incident from the plurality of input terminals into an optical signal of a predetermined wavelength as light, or from the plurality of input terminals. A taken out by converting each signal into an electric signal
After the TM cell is stored in the transmission frame, it is converted into an optical signal of the predetermined wavelength, and the plurality of optical signals converted to the predetermined wavelength are multiplexed to emit a wavelength multiplexed optical signal from the one output terminal. A plurality of wavelength multiplexing transmission interfaces for transmitting to a plurality of first output transmission lines, and one input terminal and one output terminal, and converts each optical signal incident from the input terminal into an electric signal. A taken out
A plurality of transmission interfaces for converting the TM cell into an optical signal after being stored in a transmission frame, emitting the signal from the output terminal, and transmitting the output signal to a plurality of second output optical transmission lines; An output terminal has a plurality of input terminals and a plurality of output terminals respectively connected thereto, and the predetermined optical line is set between the plurality of predetermined input terminals and the output terminal, or the plurality of buffers are provided. A first optical switch network for exchanging optical signals on a cell-by-cell basis under control from a wavelength multiplex receiving interface; a plurality of input terminals and a plurality of output terminals respectively connected to respective output terminals of the plurality of buffered receiving interfaces; Has,
A second optical switch network for exchanging optical signals for each cell under the control of the plurality of buffered reception interfaces; a plurality of input terminals to which the first and second optical switch networks are connected; An optical terminal having an output terminal for switching an optical signal from the plurality of input terminals to the output terminal connected to the predetermined plurality of wavelength multiplexing transmission interface input terminals and the plurality of transmission interface input terminals; An optical communication network node, comprising: a distribution switch network. 2. The switch network is provided in each of a plurality of optical sub-switch modules, and a plurality of optical splitters for splitting an input signal into a plurality of optical signals; The optical signal output from the optical branching device is switched in a predetermined line between the input terminal and the output terminal of the optical switch network and is selected in a circuit-switching manner. Or a plurality of optical switches for selecting and outputting one optical signal split by the optical splitter by a switching control signal according to a header of a cell processed by the long multiplex reception interface. The optical communication network node according to claim 1, wherein: 3. An optical communication network node having both an ATM switching function of exchanging ATM cells and an optical switching function of exchanging optical signals as light, comprising: one input terminal and a plurality of output terminals; After demultiplexing the wavelength-division multiplexed optical signal incident from the one input terminal through each of the first input optical transmission lines into a plurality of optical signals having different wavelengths, the plurality of optical signals are converted to the plurality of optical signals as light. A is output from each of the output terminals, or the plurality of optical signals are converted into electrical signals and extracted from the transmission frame.
A plurality of buffered wavelength division multiplexing receiving interfaces for temporarily storing TM cells in a buffer, processing ATM cell headers output from the buffer, converting the ATM cells into optical signals, and outputting the optical signals from each of the plurality of output terminals; An ATM cell having one input terminal and one output terminal, converting an optical signal incident from the input terminal through each of the plurality of second input optical transmission lines into an electric signal, and taking out an ATM cell extracted from the transmission frame; And a plurality of buffered receiving interfaces for processing the header of the ATM cell output from the buffer, converting the header into an optical signal, and outputting the optical signal from the output terminal, a plurality of input terminals and one output terminal. Converting each of the optical signals on the optical line incident from the plurality of input terminals into an optical signal of a predetermined wavelength as light, or from the plurality of input terminals. A taken out by converting the respective optical signals into electrical signals
After the TM cell is stored in the transmission frame, it is converted into an optical signal of the predetermined wavelength, and the plurality of optical signals converted to the predetermined wavelength are multiplexed to emit a wavelength multiplexed optical signal from the one output terminal. A plurality of wavelength-division multiplexing transmission interfaces for transmitting to a plurality of first output optical transmission lines, one input terminal and one output terminal, and converting each optical signal incident from the input terminal into an electric signal. A taken out
A plurality of transmission interfaces for storing the TM cells in a transmission frame, converting the TM cells into optical signals, emitting the signals from the output terminals, and transmitting the output signals to a plurality of second output optical transmission lines; An output end of the plurality of wavelength-division multiplexed reception interfaces with buffers and one or more of the predetermined output ends of optical signals from the plurality of input ends respectively connected to the output ends of the buffered reception interfaces. First branching selectively to
A second optical selection switch network, a plurality of input terminals connected to an output terminal of the first optical selection switch network and one output terminal, and the plurality of predetermined input terminals and one output terminal. A plurality of first optical switches for setting a predetermined optical line between output terminals or exchanging an optical signal for each cell under control from the plurality of buffered wavelength division multiplex receiving interfaces; A plurality of second light sources each having a plurality of input terminals connected to the output terminal of the optical selection switch network and one output terminal, and exchanging an optical signal for each cell under the control of the plurality of buffered reception interfaces. A switch; a plurality of input terminals connected to output terminals of the first and second output switches; and a plurality of output terminals connected to input terminals of the wavelength division multiplexing transmission interface and input terminals of the transmission interface. The a, an optical communication network node, wherein the light distribution switching network, in that they are composed of switching the optical signal to predetermined said output from said plurality of input terminals. 4. The wavelength-division multiplexing receiving interface with a buffer, a wavelength-division demultiplexer for demultiplexing a wavelength-division multiplexed signal input from the first input optical transmission line into a plurality of wavelengths, and an output from the wavelength-division demultiplexer. A plurality of optical switches for directly outputting optical signals of a plurality of wavelengths to be output, or separating the optical signals for output to a photoelectric conversion and electro-optical conversion system, and the photoelectric conversion and electro-optical conversion system of each optical switch. A photoelectric converter that converts an optical signal into an electrical signal; a cell removal circuit that receives the electrical signal converted by the photoelectric converter and retrieves cells from the transmission frame; A buffer for temporarily storing selected cells, a routing table for analyzing a header of a cell output from the buffer, and performing a process of rewriting the header to a predetermined value, An electro-optical converter that converts a cell output from the routing table into an optical cell; and for each optical switch that merges an optical cell converted by the electro-optical converter and an optical signal output from the optical switch. The optical communication network node according to claim 1, further comprising: an optical coupler provided. 5. A wavelength division multiplexing transmission interface, comprising: a plurality of optical switches for outputting an optical signal incident from the optical distribution switch network as it is or for separating the optical signal into an optical-electrical conversion and an electro-optical conversion system; A wavelength converter for converting an optical signal output directly from the optical switch into an optical signal having a predetermined wavelength; and an optical signal provided in the photoelectric conversion and electro-optical conversion system and output from the optical switch. A photoelectric converter that converts the electrical signal into an electrical signal; a cell insertion circuit that receives the electrical signal converted by the photoelectric converter and inserts the electrical signal into a transmission frame; and an electrical signal that is inserted into the transmission frame by the cell insertion circuit. And an optical-to-optical converter for converting the optical signal into an optical signal having a predetermined wavelength, and an optical signal converted by the electro-optical converter and an optical signal converted by the wavelength converter. And an optical multiplexer provided for each of the optical switches, and a wavelength multiplexing converter that multiplexes the optical signals combined by the respective optical multiplexers and outputs a wavelength multiplexed signal. The optical communication network node according to claim 1 or 3, wherein 6. The first and second selective switch networks, wherein the optical signal input from the buffered wavelength division multiplex receiving interface or the buffered receiving interface is branched to only a predetermined output port, and 4. The optical communication network node according to claim 3, further comprising a plurality of optical switches for selectively branching and outputting one by one to an arbitrary output terminal group in the output terminal group. 7. An optical communication network node having both an ATM switching function of exchanging ATM cells and an optical switching function of exchanging optical signals as light, comprising: one input terminal and a plurality of output terminals; After demultiplexing the wavelength-division multiplexed optical signal incident from the one input end through each of the first input optical transmission lines into a plurality of optical signals having different wavelengths, A is output from each of the output terminals, or the plurality of optical signals are converted into electrical signals and extracted from the transmission frame.
A plurality of buffered wavelength division multiplexing receiving interfaces for temporarily storing TM cells in a buffer, processing ATM cell headers output from the buffer, converting the ATM cells into optical signals, and outputting the optical signals from each of the plurality of output terminals; An ATM cell having one input terminal and one output terminal, converting an optical signal incident from the input terminal through each of the plurality of second input optical transmission lines into an electric signal, and taking out an ATM cell extracted from the transmission frame; And a plurality of buffered receiving interfaces for processing the header of the ATM cell output from the buffer, converting the header into an optical signal, and outputting the optical signal from the output terminal, a plurality of input terminals and one output terminal. Converting each of the optical signals on the optical line incident from the plurality of input terminals into an optical signal of a predetermined wavelength as light, or from the plurality of input terminals. A taken out by converting the respective optical signals into electrical signals
After the TM cell is stored in the transmission frame, it is converted into an optical signal of the predetermined wavelength, and the plurality of optical signals converted to the predetermined wavelength are multiplexed to emit a wavelength multiplexed optical signal from the one output terminal. A plurality of wavelength-division multiplexing transmission interfaces for transmitting to a plurality of first output optical transmission lines, one input terminal and one output terminal, and converting each optical signal incident from the input terminal into an electric signal. A taken out
A plurality of transmission interfaces for storing TM cells in a transmission frame, converting them into optical signals, emitting the signals from the output terminal, and transmitting the signals to a plurality of second output optical transmission lines; a plurality of input terminals; A plurality of output terminals connected to the respective output terminals, the predetermined optical line is set between the plurality of predetermined input terminals and the output terminal, or the plurality of buffered wavelength multiplexing reception interfaces A first optical switch network for exchanging optical signals for each cell under the control of the plurality of buffered receiving interfaces; and a plurality of input terminals and a plurality of output terminals connected to the respective output terminals of the transmission interface. An optical signal for each cell under the control of the plurality of buffered wavelength multiplexing reception interfaces and the plurality of buffered reception interfaces. A second optical switch network, a plurality of input terminals connected to each output terminal of the buffered wavelength division multiplexing interface, each output terminal of the buffered multiplex interface, and the first optical switch network. And a plurality of output terminals connected to an input terminal of the second optical switch network, and an optical distribution switch circuit for switching an optical signal from the plurality of input terminals to the predetermined output terminal. An optical communication network node, comprising: a network. 8. An optical communication network node having both an ATM switching function for exchanging ATM cells and an optical switching function for exchanging optical signals as light, comprising one input terminal and a plurality of output terminals, After demultiplexing the wavelength-division multiplexed optical signal incident from the one input terminal through each of the first input optical transmission lines into a plurality of optical signals having different wavelengths, the plurality of optical signals are converted to the plurality of optical signals as light. A is output from each of the output terminals, or the plurality of optical signals are converted into electrical signals and extracted from the transmission frame.
A plurality of buffered wavelength division multiplexing receiving interfaces for temporarily storing TM cells in a buffer, processing ATM cell headers output from the buffer, converting the ATM cells into optical signals, and outputting the optical signals from each of the plurality of output terminals; It has one input terminal and one output terminal, converts an optical signal incident from the input terminal through a plurality of second input optical transmission lines into an electric signal, and stores the ATM cell extracted from the transmission frame in a temporary buffer. And a plurality of buffered receiving interfaces that process the header of the ATM cell output from the buffer, convert the header into an optical signal, and output from the output terminal, and a plurality of input terminals and one output terminal. Either convert each of the optical signals on the optical line incident from the plurality of input terminals into an optical signal of a predetermined wavelength as light, or convert the optical signals from the plurality of input terminals. A taken out by converting the people into an electric signal
After the TM cell is stored in the transmission frame, it is converted into an optical signal of the predetermined wavelength, and the plurality of optical signals converted to the predetermined wavelength are multiplexed to emit a wavelength multiplexed optical signal from the one output terminal. A plurality of wavelength-division multiplexing transmission interfaces for transmitting to a plurality of first output optical transmission lines, one input terminal and one output terminal, and converting each optical signal incident from the input terminal into an electric signal. A taken out
A plurality of transmission interfaces for storing the TM cells in a transmission frame, converting the TM cells into optical signals, emitting the signals from the output terminals, and transmitting the output signals to a plurality of second output optical transmission lines; and a plurality of input terminals and a plurality of output terminals. A first and a second optical selection switch network for selectively branching optical signals from the plurality of input terminals to one or more predetermined output terminals; and a first optical selection switch. A plurality of input terminals connected to each output terminal of the network and one output terminal connected to each input terminal of each of the wavelength division multiplexing transmission interfaces, wherein the plurality of predetermined input terminals and one output terminal are connected to each other; A plurality of first optical lines for setting an optical line predetermined between them or exchanging an optical signal for each cell under the control of the plurality of wavelength-division multiplexed reception interfaces with buffers and the plurality of reception interfaces with buffers. An optical switch; a plurality of input ends connected to an output end of the second optical selective switch network and one output end; the plurality of buffered wavelength division multiplexing reception interfaces and the plurality of buffered reception interfaces A plurality of second optical switches for exchanging optical signals for each cell under the control of a plurality of input terminals connected to respective output terminals of the buffered long multiplex receiving interface, and the first optical selective switch circuit An optical distribution switch circuit having a plurality of output terminals connected to a network and each input terminal of the second optical selection switch network, and switching an optical signal from the plurality of input terminals to the predetermined output terminal; An optical communication network node, comprising: a network. 9. An optical communication network node having both an ATM switching function for exchanging ATM cells and an optical switching function for exchanging optical signals as light, comprising: one input terminal, a plurality of first output terminals, and a plurality of first output terminals. After demultiplexing the wavelength-division multiplexed optical signal incident from the one input terminal through each of the plurality of first input optical transmission lines into a plurality of optical signals having different wavelengths, Either emitting a plurality of optical signals as light from each of the plurality of first output terminals or converting the plurality of optical signals into electrical signals and storing ATM cells extracted from a transmission frame in a temporary buffer, A plurality of buffered wavelength division multiplexing reception interfaces for processing a header of an ATM cell output from the buffer, converting the header into an optical signal, and outputting the optical signal from each of the plurality of second output terminals; It has an end and one output, taken out from the transmission frame optical signal incident through each of the input ends of the second input optical transmission path into an electric signal AT
A plurality of buffered receiving interfaces for accumulating M cells in a temporary buffer, processing headers of ATM cells output from the buffer, converting the ATM cells into optical signals, and outputting the optical signals from the output end; And a plurality of second input terminals and one output terminal, wherein each of the optical signals on the optical line incident from the plurality of first input terminals is converted into an optical signal of a predetermined wavelength as light. Alternatively, each of the optical signals from the plurality of second input terminals is converted into an electric signal, and the extracted ATM cell is stored in a transmission frame, and then converted into an optical signal of the predetermined wavelength, and The plurality of converted optical signals are multiplexed to generate a wavelength multiplexed optical signal from the one output terminal.
ATM cell having a plurality of wavelength multiplexing transmission interfaces for outputting to an output optical transmission line, an input terminal and an output terminal, and converting each optical signal incident from the input terminal into an electric signal and extracting the same. Are stored in a transmission frame, are converted into optical signals, and are output from the output terminal to a plurality of first output optical transmission lines, and are connected to first output terminals of the buffered wavelength division multiplexing reception interface. A plurality of input terminals and an output terminal connected to the input terminals of the plurality of wavelength multiplexing transmission interfaces, and sets the predetermined optical line between the plurality of predetermined input terminals and the output terminal. A first optical switch network, a plurality of input terminals to which a second output terminal of the buffered wavelength division multiplex receiving interface is connected, and the transmission interface of the transmission interface via an optical coupler. A plurality of output terminals connected to the power terminal, a second to exchange optical signals for each cell in the control of the wavelength multiplexing reception interface with the plurality of buffers
And a plurality of input terminals connected to output terminals of the plurality of buffered reception interfaces via an optical spectrometer, and a plurality of input terminals connected to input terminals of the transmission interface via the optical coupler. A third optical switch network for exchanging optical signals for each cell under the control of the plurality of buffered receiving interfaces, and a plurality of buffered receiving interfaces via the optical spectroscope. An optical signal having a plurality of input terminals connected to the output terminal and a plurality of output terminals connected to each of the second input terminals of the plurality of wavelength multiplexing transmission interfaces, and controlled by the plurality of buffered reception interfaces. And a fourth optical switch circuit for exchanging for each cell. 10. The receiving interface with a buffer, comprising: an opto-electric converter for converting an input optical signal into an electric signal; and inputting the electric signal converted by the opto-electric converter to convert a cell from a transmission frame. A cell extraction circuit to be extracted, a buffer for temporarily storing cells extracted from the cell extraction circuit, a routing table for analyzing a header of a cell output from the buffer and performing a process of rewriting the header to a predetermined value, 10. The optical communication network node according to claim 1, further comprising: an electro-optical converter that converts cells output from the routing table into optical cells and outputs the converted cells. 11. The transmission interface converts an optical signal input from the optical distribution switch network into an electric signal, and inputs and transmits the electric signal converted by the opto-electric converter. The cell insertion circuit for inserting the signal into a frame, and an electro-optical converter that converts the electric signal inserted into the transmission frame into an optical signal and outputs the optical signal by the cell insertion circuit, wherein 10. The optical communication network node according to 3 or 9. 12. The wavelength-division multiplexing receiving interface with a buffer, a wavelength-division demultiplexer for demultiplexing a wavelength-division multiplexed signal input from the first input optical transmission line into a plurality of wavelengths, and an output from the wavelength-division demultiplexer. When an optical signal of a plurality of wavelengths is subjected to ATM conversion by the optical switch network,
A plurality of optical switches that are output to the optical switch network or separated so as to be output to a photoelectric conversion and electro-optical conversion system; and provided in the photoelectric conversion and electro-optical conversion system of each optical switch. A photoelectric conversion device that converts the optical signal into an electric signal, a cell extraction circuit that receives the electric signal converted by the photoelectric conversion device and extracts a cell from a transmission frame, and a cell that is extracted from the cell extraction circuit. A buffer for temporarily storing the data, a routing table for analyzing a header of a cell output from the buffer and rewriting the header to a predetermined value, and an electric light for converting a cell output from the routing table to an optical cell. The optical communication network node according to claim 9, further comprising: a converter. 13. The wavelength-division multiplexing transmission interface includes: a plurality of wavelength converters for converting an optical signal exchanged in the first optical switch network into an optical signal of a predetermined wavelength; and the buffered reception interface. A plurality of opto-electrical converters provided in an opto-electrical converter for converting an optical signal, which has been ATM-converted by the fourth optical switch network into an electric signal, and an electro-optical converter; A plurality of cell insertion circuits for inserting an electric signal into a transmission frame; a plurality of electro-optical converters for converting an electric signal from the cell insertion circuit into an optical signal of a predetermined wavelength; An optical multiplexer provided for each optical conversion system and merging the optical signal whose wavelength has been converted by the wavelength converter and the optical signal converted by the electro-optical converter. Optical communication network node of claim 9 wherein. 14. The plurality of optical switch circuits, provided in each of a plurality of optical sub-switch modules, for converting an input optical signal into an optical signal of a predetermined wavelength, A star coupler that is provided in each of the sub-switch modules and multiplexes the wavelength of the optical signal input from the wavelength converter to branch into a plurality of wavelength-multiplexed signals; A plurality of optical switches for selecting one of the wavelength multiplexed signals branched from the coupler; and a plurality of optical switches provided for each of the optical sub-switch modules for each of the optical switches, and selected for each of the optical switches. And a variable wavelength filter that selects and outputs an optical signal of a predetermined wavelength from the one wavelength multiplexed signal. Optical communication network node according to claim 9, wherein.