JP2001044936A - Optical communication node and wavelength multiplex optical transmitter of ring constitution consisting of the node - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the constitution of a wavelength multiplex optical transmitter by providing a 2nd (1×2)-optical path selection means which outputs selectively the 2nd multiplexing optical signals to the 2nd and 1st optical coupling means. SOLUTION: The (n) pieces of optical signals λ1-λn which are outputted from the insertion separation (ADM) devices 111-1 to 111-n which undergo the wavelength division multiplexing via a wavelength multiplexing part 105, are amplified by an optical booster amplifier 106 as a single piece of optical signal and then are sent to a counterclockwise operating optical fiber transmission line via a (4×4)-optical switch 102. When two pieces of operating transmission lines are cut between the nodes 2 and 3, a path is changed by the switch 102 at the node 2 so as to input and output the optical signal that is connected to the path to be inputted and outputted to an operating transmission line set between the nodes 2 and 3 to a standby transmission line set between the nodes 2 and 3. At the node 3, a path is changed by the switch 102 so as to input and output the optical signal that is connected to the path to be inputted and outputted to an operating transmission line set between the nodes 2 and 3 to a standby transmission line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical transmission device having a ring configuration in which a plurality of nodes are connected in a ring, and more particularly to an optical transmission device having a ring configuration using a wavelength division multiplexing (WDM) technique.

[0002]

2. Description of the Related Art A conventional technology of a ring-shaped optical transmission device in which a plurality of nodes are connected in a ring will be described with reference to FIG. FIG. 16 is a diagram illustrating an example of a configuration of an optical transmission device having a ring configuration using m nodes.
Each node transmits an optical signal by performing optical wavelength division multiplexing on wavelengths of λ1 to λn.

In FIG. 16, 901-1 to 901-m
Is an optical add / drop node, 902-1 to 4 are transmission line optical fibers (902-1: counterclockwise operation system, 902-2: clockwise operation system, 902-3: counterclockwise standby system, 902-
4: clockwise standby system), 951 is an optical preamplifier (pre-optical amplifier), 952 is a wavelength separation unit, 953 is a wavelength multiplexing unit,
954 is an optical booster amplifier (booster optical amplifier), 9
55 is an optical preamplifier, 956 is a wavelength demultiplexing unit, 957 is a wavelength multiplexing unit, 958 is an optical booster amplifier, 959 is an optical preamplifier, 960 is a wavelength demultiplexing unit, 961 is a wavelength multiplexing unit,
962 is an optical booster amplifier, 963 is an optical preamplifier,
Reference numeral 964 denotes a wavelength demultiplexing unit, 965 denotes a wavelength multiplexing unit, 966 denotes an optical booster amplifier, and 967-1 to n denotes insertion / separation (AD
M) Apparatus, 971 to 974, a high-speed signal reception interface unit, 975 to 978, a high-speed signal transmission interface unit, 979, a cross-connect unit, and 980, a low-speed signal interface unit.

In FIG. 16, the m nodes are connected in a ring by four transmission line optical fibers, two in the bidirectional operation system and two in the bidirectional protection system. Each node sends an optical signal obtained by wavelength-division multiplexing n wavelengths of wavelengths λ1 to λn to each of the four optical fiber transmission lines, and each node transmits the optical signal from the four optical fiber transmission lines. An optical signal in which n wavelengths of wavelengths λ1 to λn are wavelength division multiplexed is received.

Next, the operation of each node of the conventional optical transmission device having the ring configuration having the above configuration will be described.

An optical signal received from a transmission line optical fiber of a counterclockwise operation system is amplified by an optical preamplifier 951 and separated into n wavelength components λ1 to λn by a wavelength separation unit 952. Here, the n optical signals λ1 to λn that have been wavelength-separated are input to the ADM devices 967-1 to 967-n, respectively. That is, the optical signal of the wavelength λ1 is input to the ADM device 967-1, the optical signal of the wavelength λ2 is input to the ADM device 967-2, and the wavelength λn is input to the ADM device 967-n.
Is input.

[0007] Each of the ADM devices 97-1 to 967-n outputs n optical signals having wavelengths λ1 to λn. That is, the optical signal of the wavelength λ1 is output from the ADM device 967-1, the optical signal of the wavelength λ2 is output from the ADM device 967-2,
Each of the ADM devices 967-n outputs an optical signal having a wavelength λn. The n optical signals of wavelengths λ1 to λn output from each of the ADM devices 97-1 to 967-n are
The signal is wavelength-division multiplexed at 53, amplified as one optical signal by an optical booster amplifier 954, and transmitted to an optical fiber transmission line of a counterclockwise operation system. Other transmission paths, ie, clockwise operation system 902-2, counterclockwise backup system 9
02-3, the demultiplexing operation of the wavelengths λ1 to λn is performed for the optical signals transmitted and received via the clockwise backup system 902-4 in the same manner as the above operation.

In FIG. 16, for a clockwise operation system, an optical preamplifier 955, a wavelength separation unit 956, a wavelength multiplexing unit 957, and an optical booster amplifier 958 are provided. For a counterclockwise standby system, an optical preamplifier 959, a wavelength separation unit 960,
The wavelength multiplexing unit 961 and the optical booster amplifier 962 are used for the clockwise standby system, and the optical preamplifier 963, the wavelength separation unit 964, the wavelength multiplexing unit 965, and the optical booster amplifier 966 are used for the clockwise standby system.
Are applied respectively.

The operation in the ADM device 967-1 is as follows.
It looks like this:

[0010] Wavelength separation units 952, 956, 960, 96
The four optical signals having the wavelength λ1 input from the high-speed signal receiving unit 4 are respectively high-speed signal receiving interface units (HSRx) 971 to 9
At 74, optical / electrical conversion, overhead signal termination, and time division are separated. Thereafter, the data is input to the cross connect unit 979 as an electric data signal. Also, the high-speed signal transmission interface units (HSTx) 975 to 978 receive an electric data signal from the cross-connect unit 979, perform time-division multiplexing, add overhead signals, and perform an electric / optical conversion operation. To the wavelength multiplexing units 953, 957, 9
61,965. The cross connect unit 979 is
High-speed signal receiving interface (HSRx) 971-9
The four pairs of electrical data signals input from the H.74 and the four pairs of electrical data signals output to the high-speed signal transmission interface units (HSTx) 975 to 978 are selected according to the failure state of a transmission line or the like in the ring network. And a function of separating and connecting part or all of the input electric data signal to the low-speed signal interface unit 980 and inserting a signal from the low-speed signal interface unit 980 into the output data signal. .

Next, a description will be given of a recovery operation when a failure occurs in a transmission line or the like in the conventional ring-shaped optical transmission device shown in FIG. FIG. 17 is a diagram showing this state.

In FIG. 17, first, (a) at normal time,
Data signals are transmitted and received between the node 2 and the node 5 via two operation transmission lines. In nodes 2 and 5, data signals are input / output from a low-speed signal interface unit inside the node, and a route is set in a cross-connect unit.

FIG. 17B shows the operation when two working transmission lines are disconnected between the node 2 and the node 3. In this case, the node 2 inserts and separates the data signal, which has been route-connected so as to be inserted and separated from the active transmission line between the nodes 2-3, to the standby transmission line between the nodes 2-3. Then, the route is changed in the cross connect unit. In the node 3, the optical signal input / output via the protection transmission line on the node 2 side is connected to the optical signal input / output via the operation transmission line on the node 4 side. The route is changed at the cross connect section. Thereby, communication of the data signal can be secured by avoiding the disconnected transmission path.

An operation system between the node 2 and the node 3
FIG. 17C shows the operation when both transmission paths of the standby system are disconnected. In this case, in the node 2, the node 2-3
The cross-connect unit changes the path of the data signal that has been route-connected to the active transmission line between the nodes 2-1 so as to be inserted and separated into the standby transmission line between the nodes 2-1. . In the node 3, the optical signal input / output via the protection transmission line on the node 4 side is connected to the optical signal input / output via the operation transmission line on the node 4 side. The route is changed at the cross connect section. Thereby, communication of the data signal can be secured by avoiding the disconnected transmission path.

FIG. 17 shows the operation when the node 3 fails.
(D) of FIG. In this case, in node 2, node 2-
The data path, which has been route-connected so as to be inserted / separated from the active transmission line between the nodes 3, is changed by the cross-connect unit so as to be inserted / separated from the standby transmission line between the nodes 2-1. . Also, in node 4, node 5
The path is changed by the cross-connect part so that the optical signal input / output via the protection transmission line on the side and the optical signal input / output via the operation transmission line on the node 5 are connected. I do. As a result, communication of the data signal can be secured while avoiding the failed part.

Next, another conventional ring-shaped optical transmission device will be described. FIG. 18 is an example of a configuration of a ring-shaped optical transmission device using m nodes.
Signals are transmitted by wavelength division multiplexing the wavelength of λn.

In FIG. 19, 901-1 to 901-m
Is an optical insertion / demultiplexing node, 902-1 to 4 are transmission line optical fibers (902-1: counterclockwise operation system, 902-2: clockwise operation system, 902-3: clockwise standby system, 902-
4: counterclockwise standby system), 1001 is an optical preamplifier, 1
002 is a wavelength demultiplexing unit, 1003 is a wavelength multiplexing unit, 1004
Is an optical booster amplifier, 1005 is an optical preamplifier, 10
06 is a wavelength demultiplexing unit, 1007 is a wavelength multiplexing unit, 1008 is an optical booster amplifier, and 1009-1 to n are insertion demultiplexers (A
DM) devices, 1010 and 1011 are optical repeater amplifiers,
12 to 1015 are 2 × 2 optical switches, 1051 and 105
4 is a high-speed signal receiving interface unit;
Reference numeral 3 denotes a high-speed signal transmission interface unit, 1055 denotes a cross-connect unit, and 1056 denotes a low-speed signal interface unit.

In FIG. 18, the m nodes are connected in a ring by a total of four transmission line optical fibers, two in the bidirectional operation system and two in the bidirectional backup system. From each node, the wavelength λ1
transmitting an optical signal obtained by wavelength division multiplexing n wavelengths of λn,
In addition, each node transmits wavelengths λ1 to λ from the optical fiber transmission line.
An optical signal in which n wavelengths of n wavelength division multiplexing are received.

The operation of each node in the normal state, that is, when no failure occurs in the network, is as follows.

An optical signal received from the transmission line optical fiber of the counterclockwise operation system is amplified by an optical preamplifier 1001 via a 2 × 2 optical switch 1012, and a wavelength separation unit 1002
Are separated into n wavelength components of λ1 to λn. Here, the n optical signals of wavelengths λ1 to λn are input to ADM devices 1009-1 to 1009-1n, respectively. That is,
The ADM device 1009-1 receives an optical signal of wavelength λ1, the ADM device 1009-2 receives an optical signal of wavelength λ2, and the ADM device 1009-n receives an optical signal of wavelength λn.

Each of the ADM devices 1009-1 to 1009-1-n outputs n optical signals having wavelengths λ1 to λn. That is, an optical signal of wavelength λ1 is output from the ADM device 1009-1, an optical signal of wavelength λ2 is output from the ADM device 1009-2, and an optical signal of wavelength λn is output from the ADM device 1009-n. Each ADM device 1009-1
The n optical signals of wavelengths λ1 to λn output from n are wavelength-division multiplexed by the wavelength multiplexing unit 1003 and amplified as one optical signal by the optical booster amplifier 1004.
The signal is transmitted to the optical fiber transmission line of the counterclockwise operation system via the × 2 optical switch 1013. Clockwise operation system 902
2, the demultiplexing operation of the wavelengths λ1 to λn is performed on the optical signal transmitted and received via the optical path 2.

In FIG. 18, for a clockwise operation system, a 2 × 2 optical switch 1015, an optical preamplifier 1005,
A wavelength separation unit 1006, a wavelength multiplexing unit 1007, an optical booster amplifier 1008, and a 2 × 2 optical switch 1014 are applied.

Next, a recovery operation when a failure occurs in a transmission line or the like in the conventional ring-shaped optical transmission device shown in FIG. 19 will be described. FIG. 19 is a diagram for explaining the recovery operation.

In FIG. 19, first, (a) at normal time,
Data signals are transmitted and received between the node 2 and the node 5 via two operation transmission lines. In nodes 2 and 5, data signals are input / output from a low-speed signal interface unit inside the node, and a route is set in a cross-connect unit.

FIG. 19B shows the operation when two working transmission lines are disconnected between the nodes 2 and 3. In this case, the node 2 inputs / outputs an optical signal which is routed so as to be input / output to / from the working transmission line side between the nodes 2-3, and inputs / outputs the optical signal to / from the backup transmission line side between the opposite nodes 2-1. In this case, the path is changed by the 2 × 2 optical switch. In the node 3, the optical signal routed so as to be input / output to / from the active transmission line between the nodes 2-3 is input / output to / from the backup transmission line between the opposite nodes 3-4. As described above, the path is changed by the 2 × 2 optical switch. Thereby, communication of the data signal can be secured by avoiding the disconnected transmission path.

Between node 2 and node 3,
FIG. 19C shows the operation when both transmission paths of the standby system are disconnected. In this case, the transmission path disconnected by the same operation as described with reference to FIG. 19B can be avoided, and communication of the data signal can be secured.

FIG. 19D shows the operation when the node 3 fails. In this case, in the node 2, the optical signal which has been routed so as to be input / output to / from the active transmission line between the nodes 2-3 is input / output to / from the backup transmission line between the opposite nodes 2-1. In this case, the path is changed by the 2 × 2 optical switch. In the node 4, the optical signal which has been routed so as to be input / output to / from the active transmission line between the nodes 4-3 is input / output to / from the backup transmission line between the opposite nodes 4-5. As described above, the path is changed by the 2 × 2 optical switch. As a result, communication of the data signal can be secured by avoiding the disconnected transmission path.

[0028]

The conventional optical transmission device having a ring configuration has the following problems.

First, in an optical transmission device having a ring configuration according to the first prior art, four high-speed signal transmission / reception interface units are added to an insertion / separation (ADM) device that performs data signal processing for one wavelength in each node. And a cross-connect circuit for changing the path of all signals connected to the high-speed signal transmission / reception interface. For this reason, an optical transmission device having a ring configuration of n wavelengths requires n times as many devices, and has a problem that the device becomes very expensive and large-scale.

In the optical transmission device having a ring configuration according to the second conventional technique, an optical signal output from each node is
Only two routes can be set: the active transmission line and the backup transmission line in the opposite direction, and the route cannot be changed for the standby transmission line in the same direction. As in the example shown in FIG. 20, when a composite failure of the active transmission line between the nodes 2-3 and the node 6 occurs, the communication between the nodes 2-5 is interrupted in the second related art. For this reason, there has been a problem that the reliability of the optical transmission device having the ring configuration with respect to a failure is low.

The present invention relates to an optical communication node and a wavelength-division multiplexing optical transmission device having a ring configuration constituted by the same, and an object of the invention is to provide a system having a simple configuration and excellent reliability.

[0032]

In order to solve the above-mentioned drawbacks in the conventional configuration, an optical communication node of the present invention and a wavelength division multiplexing optical transmission device having a ring configuration constituted by the node are firstly described. As a configuration, each node has a first receiver and a second receiver that respectively convert a first received optical signal and a second received optical signal input from an input terminal into an electric signal, and an optical signal that is an optical signal. A first terminal unit and a second terminal unit respectively including a first transmitter and a second transmitter for converting the signals into a signal and outputting a first transmission optical signal and a second transmission optical signal from an output terminal, respectively; And a first bypass path and a second bypass path each having an input terminal and an output terminal.

Then, the counterclockwise operation system optical transmission line, the counterclockwise protection system optical transmission line, the output terminal of the second terminal unit, and the first
A first input port is connected to each output terminal of the bypass of the first, and a first input port is connected to each of input terminals of the clockwise operation system optical transmission line, the clockwise standby system optical transmission line, the first terminal unit, and the second bypass path. A first optical path switching switch for switching an optical path of an optical signal input from the first input port and outputting the signal to the first output port; a clockwise operation system optical transmission path; A second input port is connected to each of the standby optical transmission line, the output terminal of the first terminal unit, and the output terminal of the second bypass path, and a counterclockwise operation optical transmission line and a counterclockwise standby optical transmission line are connected. Second input ports are respectively connected to the output terminal of the second terminal unit and the output terminal of the first bypass path, and switch the optical path of the optical signal input from the second input port to the second output port. 2nd output to port
And an optical path switching switch.

Here, the first bypass path is arranged between the input terminal and the output terminal, and amplifies the input optical signal to perform the first bypass.
And a second bypass path is disposed between the input terminal and the output terminal, and amplifies the input optical signal to produce a second relay amplified optical signal. Is provided.

Each of the nodes is arranged between the first optical path switching switch and the first receiver in addition to the above-described configuration, and optically amplifies the first received optical signal to perform the first receiver operation. And a second pre-optical amplifier, which is disposed between the second optical path switch and the second receiver, optically amplifies the second received optical signal and outputs the amplified signal to the second receiver. And two pre-optical amplifiers.

Further, each node is arranged between the first optical path switching switch and the second transmitter, and optically amplifies the first transmission optical signal and outputs the amplified signal to the second optical path switching means. And a second booster disposed between the second optical path switching switch and the first transmitter for optically amplifying the first transmission optical signal and outputting the amplified signal to the first optical path switching switch And an optical amplifier.

The first terminal unit and the second terminal unit respectively perform a first receiving interface unit for performing an overhead termination and a separating operation on the first received optical signal and the second received optical signal, respectively. And a second receiving interface unit, which time-division multiplexes the input electric signals to perform overhead signal insertion, and generates and outputs an optical signal having the same wavelength as the optical signal input to the receiving interface. A first transmission interface unit and a second transmission interface unit. The first terminal unit and the second terminal unit are respectively a first transmission interface unit and a first terminal unit.
A low-speed signal interface unit for transmitting and receiving at least a part of a data signal input / output via the second transmission interface unit and the second reception interface, and a first reception interface unit and a second reception interface unit. The two pairs of electrical data signals input from the two reception interface units and the two pairs of electrical data signals output to the first transmission interface unit and the second transmission interface unit are converted into an optical signal in a wavelength-division multiplexing optical transmission device having a ring configuration. The connection is selectively performed according to the failure state of the transmission path or the node, and is input / output via the first transmission interface unit and the first reception interface, and the second transmission interface unit and the second reception interface. A clock for separating or inserting at least a part of the data signal and inputting / outputting it to / from the low-speed interface unit. It is characterized by comprising a Sukonekuto portion.

In the optical communication node according to the present invention, the first wavelength separation section and the second wavelength separation section each have an arrayed waveguide diffraction grating, and the first wavelength separation section and the second wavelength separation section have the second wavelength separation section. Each of the wavelength multiplexing units has an array waveguide diffraction grating.

Each of the first and second relay optical amplifiers is provided with an optical fiber amplifier or a semiconductor optical amplifier. Further, the first pre-optical amplifier and the second pre-optical amplifier each include an optical fiber amplifier or a semiconductor optical amplifier. The first booster optical amplifier and the second booster optical amplifier each include an optical fiber amplifier or a semiconductor optical amplifier.

The wavelength division multiplexing optical transmission device having a ring configuration according to the present invention includes m nodes, and the adjacent nodes mutually transmit the clockwise operation optical transmission line and the counterclockwise operation optical transmission. The optical transmission line is characterized in that four transmission lines, that is, a path, a clockwise backup optical transmission line, and a counterclockwise backup optical transmission line, are connected by an optical transmission line to form a ring.

Hereinafter, the second to eighth basic configurations of the present invention are also similar to the first basic configuration in that the optical communication node and the wavelength-division multiplexing optical transmission device having the ring configuration formed by the node are used. Since the relationship does not change, a description will be given as a wavelength division multiplexing optical communication device having a ring configuration.

The wavelength division multiplexing optical transmission apparatus having a ring configuration according to the present invention has a second basic configuration in which m nodes are arranged and adjacent nodes are connected by an optical transmission line to form a ring. In the wavelength-division multiplexing optical transmission device having a ring configuration, the optical transmission line is a clockwise operation system optical transmission line, a counterclockwise operation system optical transmission line, a clockwise backup system optical transmission line, and a counterclockwise protection system optical transmission line. And Each node receives a first input optical signal obtained by wavelength multiplexing an optical signal having a wavelength component of each of wavelengths λ1 to λn (n is an integer of 2 or more, the same applies hereinafter) input from an input terminal. A first wavelength separation unit that separates wavelengths for each wavelength component and outputs n first wavelength-separated light composed of each wavelength component, and a wavelength component of wavelengths λ1 to λn input from an input terminal. A first wavelength multiplexing unit that wavelength-multiplexes each optical signal and outputs a first multiplexed optical signal; and an optical signal input from an input terminal and having respective wavelength components of wavelengths λ1 to λn. A second wavelength demultiplexing unit that demultiplexes the converted second input optical signal into wavelengths for each wavelength component and outputs n second wavelength demultiplexed light composed of each wavelength component; , Each optical signal having wavelength components of wavelengths λ1 to λn A second wavelength multiplexing unit for wavelength multiplexing and outputting a second multiplexed optical signal. Furthermore, n
From the first wavelength-separated lights and the n second wavelength-separated lights,
A first wavelength separation light input unit and a second wavelength to which corresponding first wavelength separation light and second wavelength separation light having the same wavelength λi (1 ≦ i ≦ n) are input, respectively; A split optical input unit, a first add optical signal and a second add optical signal having the same wavelength as the wavelength λi (1 ≦ i ≦ n) are input, and the first add optical signal and the second add optical signal are input. N insertion / separation units each including a first insertion optical signal input unit and a second insertion optical signal input unit for respectively outputting an insertion optical signal to the first wavelength multiplexing unit and the second wavelength multiplexing unit; It has. A first bypass path and a second bypass path each having an input terminal and an output terminal; a counterclockwise operation optical transmission line, a counterclockwise backup optical transmission line, and an output terminal of the second wavelength multiplexing unit; And the first bypass output terminals
And a first output port is connected to each of input ends of the clockwise operation system optical transmission line, the clockwise standby system optical transmission line, the first wavelength separation unit, and the second bypass path. A first optical path switching switch for switching an optical path of an optical signal input from the first input port and outputting the optical signal to a first output port; a clockwise operation system optical transmission path, a clockwise standby system optical transmission path, and a first A second input port is connected to an output terminal of the wavelength multiplexing unit and an output terminal of the second bypass path, respectively, and a counterclockwise operation system optical transmission line, a counterclockwise standby system optical transmission line, and a second wavelength demultiplexer. A second input port is connected to an output terminal of the unit and an output terminal of the first bypass path, respectively, and switches an optical path of an optical signal input from the second input port and outputs the optical signal to the second output port. Optical path changeover switch It is.

Here, the first bypass path is disposed between the input terminal and the output terminal, amplifies the input optical signal having n wavelength components of λ1 to λn, and amplifies the first relay amplified optical signal. A first repeater optical amplifier for outputting a signal; a second bypass path disposed between an input terminal and an output terminal for amplifying an input optical signal having n wavelength components of λ1 to λn. A second repeater optical amplifier for outputting a second repeater amplified optical signal.

Each node is further disposed between the first optical path switching means and the first wavelength demultiplexing unit, and optically amplifies the input multiplexed optical signal and outputs it to the first wavelength demultiplexing unit. The first multiplexed optical signal is disposed between the first pre-amplifier and the second optical path switching unit and the second wavelength demultiplexing unit, and the optical signal is amplified and output to the second wavelength demultiplexing unit. A second pre-optical amplifier. Each of the nodes is arranged between the first optical path switching switch and the second wavelength multiplexing unit, and optically amplifies the second multiplexed optical signal and outputs the amplified signal to the first optical path switching unit. And a second optical path switching unit disposed between the second optical path switching means and the first wavelength multiplexing unit, for optically amplifying the first multiplexed optical signal and outputting the amplified signal to the second optical path switching switch. And a booster optical amplifier.

Each of the n insertion / separation units is the first
And an optical-electrical converter that converts each of the wavelength-separated light and the second wavelength-separated light into an electric signal, and performs an overhead termination and a separation operation on the first wavelength-separated light and the second wavelength-separated light, respectively. An optical signal having the same wavelength λi as an optical signal input to the receiving interface by performing time-division multiplexing on the input electrical data signals and inserting an overhead signal into each of the first and second receiving interface units; A first transmission interface unit and a second transmission interface unit for generating and outputting the same.

Further, the n insertion / separation units respectively include data signals input / output via the first transmission interface unit and the first reception interface, and the second transmission interface unit and the second reception interface. A low-speed signal interface unit for transmitting and receiving at least a part of the first and second pairs of electrical data signals input from the first and second reception interface units and the first
The two pairs of electrical data signals output to the transmission interface unit and the second transmission interface unit are selectively connected in accordance with a failure state of an optical transmission line or a node in a wavelength-division multiplexing optical transmission device having a ring configuration. And separating or inserting at least a part of a data signal input / output via the first transmission interface unit and the first reception interface and the second transmission interface unit and the second reception interface to input / output to / from the low-speed interface unit And a cross-connect part.

Further, as a third basic configuration of the present invention, each node is further disposed after the first wavelength demultiplexing unit,
The wavelengths λ1 to λn input from the first wavelength separation unit
And a first n × n optical switch for selectively connecting each optical signal to n insertion / separation units, and a second wavelength separation unit, and an input from the second wavelength separation unit. And a second n × n optical switch for selectively connecting each of the optical signals having the wavelengths λ1 to λn to the n insertion / separation units.

Further, as a fourth basic configuration of the present invention,
Instead of the above configuration, each node includes p (p is an integer equal to or more than n, the same applies hereinafter) insertion / separation units including n insertion / separation units, and further, is provided downstream of the first wavelength separation unit. Placed,
N optical signals of wavelengths λ1 to λn are input from the wavelength separation unit, and a first n × p optical switch selectively connected to p insertion separation units, and a second wavelength separation unit A second n × p optical switch, which is disposed at a subsequent stage and receives n optical signals of wavelengths λ1 to λn from the wavelength separation unit and selectively connects to the p insertion separation units; A first p × n optical switch which is arranged in front of the wavelength multiplexing unit, receives p optical signals from each insertion / demultiplexing unit, and selectively connects to each input terminal of the first wavelength multiplexing unit. And p optical signals from each insertion / demultiplexing unit are arranged at a stage prior to the second wavelength multiplexing unit, and the first p signals are selectively connected to respective input terminals of the second wavelength multiplexing unit. × n optical switches. On the other hand, each insertion / separation unit is further provided with a wavelength selecting means for selecting the wavelength of the optical signal from the wavelengths λ1 to λn.

Each of the nodes further includes a first first wavelength separated light of the n first wavelength separated lights and a first first wavelength separated light of the n second wavelength separated lights. The second wavelength separation light is selectively switched to each other, and is output to the first wavelength separation light input unit and the second insertion separation unit of the first insertion separation unit among the n insertion separation units. The receiving side 2 × 2 optical switch, the first first optical signal among the n first optical signals, and the first first optical signal among the n second optical signals. And selectively switching between the two insertion optical signals,
It is characterized in that it comprises a transmission side 2 × 2 optical switch for outputting to the first wavelength multiplexing unit and the second wavelength multiplexing unit.

The wavelength division multiplexing optical transmission apparatus having a ring configuration according to the present invention has a fifth basic configuration in which m nodes are arranged and adjacent nodes are connected by an optical transmission line to form a ring. In the wavelength-division multiplexing optical transmission device having a ring configuration, the optical transmission line is a clockwise operation system optical transmission line, a counterclockwise operation system optical transmission line, a clockwise backup system optical transmission line, and a counterclockwise protection system optical transmission line. And Each node separates the wavelength of a first input optical signal, which is input from an input terminal and is multiplexed with an optical signal having wavelength components of wavelengths λ1 to λn, for each wavelength component, and demultiplexes each wavelength component. A first wavelength demultiplexing unit that outputs n first wavelength demultiplexed light composed of light components, and a first wavelength division multiplexing unit that wavelength-multiplexes each optical signal input from an input terminal and has wavelength components of wavelengths λ1 to λn. A first wavelength multiplexing unit that outputs the multiplexed optical signal of the above, and a second input optical signal obtained by wavelength multiplexing an optical signal having wavelength components of wavelengths λ1 to λn input from an input terminal. A second wavelength separation unit that separates wavelengths for each wavelength component and outputs n second wavelength-separated lights composed of the wavelength components, and wavelengths λ1 to λ input from an input terminal.
a second wavelength multiplexing unit that wavelength-multiplexes each optical signal having n wavelength components and outputs a second multiplexed optical signal, and a first receiving unit that converts the input optical signal into an electric signal. A second receiving means for converting the input optical signal into an electric signal, a first transmitting means for converting the electric signal into an optical signal and outputting the same, and a second transmitting means for converting the electric signal into an optical signal and outputting the same. And at least one insertion / separation unit including transmission means. Then, at least one of the n first wavelength-separated lights, and a second wavelength-separated light having a wavelength component of a wavelength λi corresponding to the wavelength λi of the first wavelength-separated light. A receiving side 2 × 2 optical switch for selectively switching light and light to each other and outputting the first and second receiving means of the insertion / separation unit corresponding to the wavelength λi of the insertion / separation unit; A first bypass path and a second bypass path each having an end and an output end, a counterclockwise operation optical transmission line, a counterclockwise standby optical transmission line, and an output end of the second wavelength multiplexing unit; The first input port is connected to the output terminal of the bypass of the first optical path, and the first input port is connected to the input terminal of the clockwise operation system optical transmission line, the clockwise standby system optical transmission line, the first wavelength separation unit, and the second bypass path. 1 output ports are connected and input from the first input port. A first optical path switching switch for switching the optical path of the optical signal thus output to the first output port, a clockwise operation system optical transmission path, a clockwise standby system optical transmission path, and an output terminal of the first wavelength multiplexing unit. And second output ports of the second bypass path are connected to the second input ports, respectively. The counterclockwise operation system optical transmission line, the counterclockwise standby system optical transmission line, the output terminal of the second wavelength separation unit, and the first A second input port is connected to each output end of the bypass path, and a second optical path switching switch that switches the optical path of the optical signal input from the second input port and outputs the optical signal to the second output port. Have.

Each of the nodes further includes an i-th first add optical signal of the n first add optical signals and an i-th first add optical signal of the n second add optical signals. A transmission side 2 × 2 optical switch for selectively switching the second add optical signal to each other and outputting to the first wavelength multiplexing unit and the second wavelength multiplexing unit is provided.

Here, the first bypass path and the second bypass path are disposed between the input terminal and the output terminal, and amplify the inputted optical signal having n wavelength components of λ1 to λn. A first repeater optical amplifier and a second repeater optical amplifier that respectively output a first repeater amplified optical signal and a second repeater amplified optical signal.

Each node is further disposed between the first optical path switching switch and the first wavelength demultiplexing unit, and optically amplifies the input multiplexed optical signal to perform the first wavelength demultiplexing. A first pre-amplifier that outputs the multiplexed optical signal to a second wavelength demultiplexer, and is disposed between the second optical path switching switch and the second wavelength demultiplexer. And a second pre-optical amplifier that outputs the signal to a second pre-optical amplifier.

Further, each node is disposed between the first optical path switching switch and the second wavelength multiplexing unit, and optically amplifies the second multiplexed optical signal to form a first optical path switching switch. A first booster optical amplifier for outputting, and a second optical path switching unit and a first wavelength multiplexing unit, which are disposed between the first optical amplifier and the first wavelength multiplexing unit, and optically amplify the first multiplexed optical signal to form a second optical path switching switch. And a second booster optical amplifier for outputting.

In the wavelength division multiplexing optical transmission apparatus having a ring configuration according to the present invention, as a fifth basic configuration, m nodes are arranged, and adjacent nodes are connected by an optical transmission line to form a ring. In the configured WDM optical transmission device having a ring configuration, the optical transmission line has a clockwise optical transmission line and a counterclockwise optical transmission line. Each node separates the wavelength of a first input optical signal, which is input from an input terminal and is multiplexed with an optical signal having wavelength components of wavelengths λ1 to λn, for each wavelength component, and demultiplexes each wavelength component. A first wavelength demultiplexing unit that outputs n first wavelength demultiplexed light composed of light components, and a first wavelength division multiplexing unit that wavelength-multiplexes each optical signal input from an input terminal and has wavelength components of wavelengths λ1 to λn. A first wavelength multiplexing unit that outputs a multiplexed optical signal, and wavelengths λn + 1 to λn + n input from an input terminal.
A second input optical signal, in which an optical signal having each wavelength component is wavelength-multiplexed, is wavelength-separated for each wavelength component, and n second wavelength-separated light composed of each wavelength component is output. And a wavelength λn +
A second wavelength multiplexing unit that wavelength-multiplexes each optical signal having wavelength components of 1 to λn + n to output a second multiplexed optical signal; n first wavelength-separated light and n second second-wavelength light; Out of the wavelength separated light, a first wavelength separated light having a wavelength component of wavelength λi (1 ≦ i ≦ n) and a second wavelength separated light having a wavelength component of wavelength λi + n corresponding to the first wavelength separated light Are respectively input, a first insertion optical signal having the same wavelength as the wavelength λi (1 ≦ i ≦ n), and a first insertion optical signal having the same wavelength as the wavelength λi (1 ≦ i ≦ n). A second add optical signal having a wavelength component of wavelength λi + n corresponding to the add optical signal is input, and the first add optical signal and the second add optical signal are input.
N add / separate sections each including a first add optical signal input section and a second add optical signal input section for respectively outputting the add optical signal to the first wavelength multiplex section and the second wavelength multiplex section. And Then, a part of the first input optical signal output from the counterclockwise optical transmission line, which is disposed between the counterclockwise optical transmission line and the first wavelength separation unit, is branched and the first
A first optical splitter that outputs a branched input optical signal, a second input optical signal that is disposed between the clockwise optical transmission line and the second wavelength separation unit, and that is output from the clockwise optical transmission line. A second optical splitter that splits a part of the optical signal and outputs a second split input optical signal, and a first wavelength splitter that selects the first input optical signal and the second split input optical signal and And a second 2 × 1 optical switch for selecting the second input optical signal and the first branch input optical signal and inputting the selected signal to the second wavelength separation unit. A first optical coupler for coupling the first multiplexed optical signal and the second branch multiplexed optical signal, and a first optical coupler for coupling the second multiplexed optical signal and the first branch multiplexed optical signal. 2 optical coupler, and disposed between the first wavelength multiplexing unit and the first optical coupler, and selects the first multiplexed optical signal as the first optical coupling means and the second optical coupler. Out A first 1 × 2 optical path selecting means, and a second wavelength multiplexing unit and a second optical coupler, for transmitting the second multiplexed optical signal to the second optical coupler and the first optical coupler. And a second 1 × 2 optical path selecting means for selecting and outputting to the optical coupling means.

Here, each node is further disposed between the counterclockwise optical transmission line and the first wavelength demultiplexing unit, and optically amplifies the input first input optical signal to perform the first wavelength demultiplexing. A first pre-optical amplifier, a clockwise optical transmission line, and a second
A second pre-optical amplifier, which is disposed between the first wavelength division unit and the second wavelength division unit and optically amplifies the input second input optical signal and outputs the amplified second input optical signal to the second wavelength division unit. A first booster optical amplifier disposed between the multiplexing unit and the counterclockwise optical transmission line for optically amplifying the first multiplexed optical signal and outputting the amplified signal to the counterclockwise optical transmission line; A second booster optical amplifier disposed between the unit and the clockwise optical transmission line, for optically amplifying the second multiplexed optical signal and outputting the amplified signal to the clockwise optical transmission line.

Further, as a sixth basic configuration of the present invention, in addition to the above-described configuration, each node is further disposed downstream of the first wavelength separation unit, and the wavelength λ1 input from the first wavelength separation unit is used. And a first n × n optical switch for selectively connecting each optical signal of .lambda.n to n insertion / separation units, and a second wavelength separation unit, which is disposed downstream of the second wavelength separation unit. And a second n × n optical switch for selectively connecting each of the optical signals of wavelengths λ1 to λn input to the n insertion / separation units.

As a seventh basic configuration of the present invention, instead of the above configuration, each node includes n (p is an integer equal to or greater than n, the same applies hereinafter) each including n insertion / separation units. , Further arranged downstream of the first wavelength separation unit, from which n optical signals of wavelengths λ1 to λn are input and selectively connected to p insertion separation units. A first n × p optical switch and a second wavelength demultiplexing unit, and n optical signals of wavelengths λ1 to λn are input from the wavelength demultiplexing unit. And a second n × p optical switch selectively connected to the first wavelength multiplexing section, and p optical signals from each insertion / demultiplexing section are generated. A first p × n optical switch selectively connected to an input end, and a first p × n optical switch arranged before the second wavelength multiplexing unit, The p number of optical signals from the separating portion, is characterized in that it comprises a first p × n optical switch for selectively connecting for each input end of the second wavelength multiplexer. Each insertion / separation unit is further provided with a wavelength selecting means for selecting the wavelength of the optical signal from the wavelengths λ1 to λn.

Each of the nodes further includes a first first wavelength-separated light of the n first wavelength-separated lights, and n
And selectively switching between the first second wavelength-separated light of the second wavelength-separated light and the first wavelength of the first insertion-separator of the n insertion-separators. A receiving side 2 × 2 optical switch for outputting to the demultiplexing optical input unit and the second insertion demultiplexing unit; and a first out of n first added optical signals.
The first wavelength-multiplexed unit and the second wavelength-multiplexed unit by selectively switching between the first first optical signal and the first second optical signal among the n second optical signals. And a transmission side 2 × 2 optical switch for outputting to the wavelength multiplexing unit.

In the wavelength division multiplexing optical transmission apparatus having a ring configuration according to the present invention, as an eighth basic configuration, m nodes are arranged, and adjacent nodes are connected by an optical transmission line to form a ring. In the configured WDM optical transmission device having a ring configuration, the optical transmission line has a clockwise optical transmission line and a counterclockwise optical transmission line. Each node separates the wavelength of a first input optical signal, which is input from an input terminal and is multiplexed with an optical signal having wavelength components of wavelengths λ1 to λn, for each wavelength component, and demultiplexes each wavelength component. A first wavelength demultiplexing unit that outputs n first wavelength demultiplexed lights composed of the components, and a first wavelength division multiplexing unit that wavelength-multiplexes each optical signal having wavelength components of wavelengths λ1 to λn input from an input terminal. A first wavelength multiplexing unit that outputs a multiplexed optical signal, and wavelengths λn + 1 to λn + n input from an input terminal.
A second input optical signal, in which an optical signal having each wavelength component is wavelength-multiplexed, is wavelength-separated for each wavelength component, and n second wavelength-separated light composed of each wavelength component is output. And a wavelength λn +
A second wavelength multiplexing unit that wavelength-multiplexes each optical signal having wavelength components of 1 to λn + n and outputs a second multiplexed optical signal. A first receiver that converts the input optical signal into an electric signal; a second receiver that converts the input optical signal into an electric signal; and a second receiver that converts the electric signal into an optical signal and outputs the same. One transmitter, at least one insertion / separation unit including a second transmitter that converts an electric signal into an optical signal and outputs the converted signal, and at least one first of n n wavelength-separated lights. And the second wavelength-separated light having a wavelength component of wavelength λi + n corresponding to the wavelength λi of the first wavelength-separated light are selectively switched to each other, and the wavelength λi or A receiving side 2 × 2 optical switch for outputting to the first receiving means or the second receiving means of the insertion / separation unit corresponding to the wavelength λi + n.

Then, of the first add optical signal corresponding to the wavelength λi of one of the n first add optical signals and the n second add optical signals, Wavelength λi + n
A 2 × 2 optical switch on the transmitting side for selectively switching between the second add optical signal having the wavelength components of the above and outputting to the first wavelength multiplexing unit and the second wavelength multiplexing unit; A second input optical signal that is disposed between the transmission path and the first wavelength separation unit and that branches a part of the first input optical signal output from the counterclockwise optical transmission path to output a first split input optical signal; 1 optical splitter, and is disposed between the clockwise optical transmission line and the second wavelength separation unit, and branches a part of the second input optical signal output from the clockwise optical transmission line to form a second optical signal. A second optical splitter for outputting a first input optical signal and a second input optical signal for selecting and inputting the first input optical signal and the second input optical signal to the first wavelength separation unit.
A × 1 optical switch, a second 2 × 1 optical switch for selecting a second input optical signal and a first branch input optical signal and inputting the selected signal to a second wavelength separation unit, and a first multiplexed optical signal A first optical coupler that couples the signal and the second branch multiplexed optical signal; and a second optical coupler that couples the second multiplexed optical signal and the first branch multiplexed optical signal.
And an optical coupler disposed between the first wavelength multiplexing unit and the first optical coupling unit, and selecting the first multiplexed optical signal as the first optical coupling unit and the second optical coupling unit. Output first 1 × 2
An optical path selecting unit, disposed between the second wavelength multiplexing unit and the second optical coupling unit, and selecting the second multiplexed optical signal as the second optical coupling unit and the first optical coupling unit; The second 1 × to output
And two optical path selecting means.

Each node is further disposed between the counterclockwise optical transmission line and the first wavelength demultiplexing unit, and optically amplifies the input first input optical signal to perform the first wavelength demultiplexing. And a second pre-optical amplifier, which is disposed between the clockwise optical transmission line and the second wavelength demultiplexing unit, optically amplifies the input second input optical signal, and outputs the second pre-optical amplifier. And a second pre-optical amplifier that outputs the signal to a second pre-optical amplifier. Each node also has a first
Disposed between the wavelength multiplexing section and the counterclockwise optical transmission line,
A first booster optical amplifier for optically amplifying the first multiplexed optical signal and outputting the amplified multiplexed optical signal to a counterclockwise optical transmission line; and a second booster optical amplifier disposed between the second wavelength multiplexing unit and the clockwise optical transmission line. And a second booster optical amplifier for optically amplifying the multiplexed optical signal and outputting the amplified optical signal to the clockwise optical transmission line.

In the above-described first basic configuration of the wavelength division multiplexing optical transmission device having a ring configuration according to the present invention, only two high-speed signal transmission / reception interface units are used in the insertion / demultiplexing (ADM) device in each node. As a result, it is possible to reduce the size and the size at a very low cost as compared with the prior art shown first. Further, in the first basic configuration, a failure recovery operation is performed by a 4 × 4 optical switch, and the number of paths for avoiding a failure portion is larger than that in the related art shown in the second example, so that the reliability is excellent.

In the second basic configuration of the present invention, in addition to the functions and effects related to the above-described first basic configuration, in this basic configuration, n ××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××× VER amount s n optical switch, and insertion and separation (A
Since a (n-1): 1 redundant configuration can be provided for a failure of the (DM) device, the reliability is further improved.

In the third basic configuration of the present invention, in addition to the functions and effects of the above-described first basic configuration, in the third basic configuration, each wavelength signal received from the transmission line is transmitted to an arbitrary insertion / separation device. Since the wavelength to be input and output from each insertion / demultiplexing (ADM) device can be arbitrarily set, the insertion / demultiplexing (AD)
M) With respect to a device failure, a redundant configuration of n: (pn) can be provided, and the reliability is excellent. In addition, insertion separation (AD
M) Since the recovery operation at the time of device failure can be performed in a closed operation within the failed node, operability is excellent.

In the fourth basic configuration of the present invention, in addition to the functions and effects of the first basic configuration described above, in the fourth basic configuration, a wavelength signal that does not need to separate / insert a data signal in a node is used. Is output to the transmission line as an optical signal, a cross-connect operation is performed by a 2 × 2 optical switch, and a multiplexing terminal device having no cross-connect section is used instead of an insertion / demultiplexing (ADM) device. ,
Further, an inexpensive system can be provided.

In the fifth basic configuration of the present invention, only two high-speed signal transmission / reception interfaces are used in the insertion / separation (ADM) device in each node. It is very inexpensive and can be miniaturized. In addition, the wavelength channels for normal transmission are separately set for the clockwise transmission line and the counterclockwise transmission line, and when a failure occurs, the route can be avoided on each transmission line, so that only two transmission line fibers are required. Excellent economy as a whole network.

In the sixth basic configuration of the present invention, in addition to the functions and effects of the fifth basic configuration described above, the sixth basic configuration arbitrarily selects a wavelength channel to be input to an insertion / separation (ADM) device. Since an nxn optical switch is provided, by providing a protection wavelength, recovery can be performed even when a failure occurs in an insertion / separation (ADM) device, so that the reliability is excellent.

In the seventh basic configuration of the present invention, in addition to the functions and effects of the sixth basic configuration, in this basic configuration, each wavelength signal received from the transmission line is input to an arbitrary insertion / separation device, Since the wavelength output from each insertion / demultiplexing (ADM) device can be set arbitrarily, a redundant configuration of n: (pn) can be provided for failure of the insertion / demultiplexing (ADM) device, and the reliability is excellent. Further, since the recovery operation at the time of the failure of the insertion / separation (ADM) device can be performed in a closed operation within the failed node, the operability is excellent.

In the eighth basic configuration of the present invention, in addition to the functions and effects of the fifth basic configuration described above, the eighth basic configuration is provided for a wavelength signal that does not need to separate / insert a data signal in a node. Is output to the transmission line as it is as an optical signal, and further performs a cross-connect operation by a 2 × 2 optical switch, and uses a multiplexing terminal equipment having no cross-connect part instead of an insertion / demultiplexing (ADM) equipment. Thus, a more inexpensive system can be provided.

[0071]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an optical communication node according to the present invention and a wavelength division multiplexing optical transmission apparatus having a ring configuration constituted by the same will be described in detail with reference to the drawings.

FIG. 1 shows the configuration of a first embodiment of an optical communication node according to the present invention and a wavelength division multiplexing optical transmission apparatus having a ring configuration constituted by the optical communication node. FIG. 1 is an example of a configuration of an optical transmission device having a ring configuration using m nodes. Each node transmits a signal by performing optical wavelength division multiplexing on wavelengths of λ1 to λn.

In FIG. 1, 1-1 to 1-m are optical insertion / separation nodes, 2-1 to 4 are transmission line optical fibers (2-1: counterclockwise operation system, 2-2: clockwise operation system, 2-3: clockwise spare system, 2-4: counterclockwise spare system), 101,
102 is a 4 × 4 optical switch, 103 is a first optical preamplifier, 104 is a first wavelength demultiplexing unit, 105 is a first wavelength multiplexing unit, 106 is a first optical booster amplifier, and 107 is a second optical preamplifier. , 108 are second wavelength separation units, 109
Denotes a second wavelength multiplexing unit, 110 denotes a second optical booster amplifier, 111-1 to 111-n denote insertion / separation (ADM) devices, 11
Reference numerals 2 and 113 are optical repeater amplifiers, 201 and 202 are high-speed signal reception interface units, 203 and 204 are high-speed signal transmission interface units, 205 is a low-speed signal interface unit, and 206 is a cross-connect unit.

As for the m nodes, the operation system has two nodes in both directions,
The standby system is connected in a ring by two transmission optical fibers, two in each direction. Each node sends an optical signal obtained by wavelength-division multiplexing n wavelengths of wavelengths λ1 to λn to the respective optical fiber transmission lines, and each node sends n optical signals of wavelengths λ1 to λn from the optical fiber transmission line. An optical signal whose wavelength is wavelength division multiplexed is received.

The operation of each node in the normal state, that is, when no failure occurs in the network, is as follows. That is, the optical signal received from the transmission line optical fiber of the counterclockwise operation system is amplified by the optical preamplifier 103 via the 4 × 4 optical switch 101, and
4 separates into n wavelength components of λ1 to λn. Here, the n optical signals of wavelengths λ1 to λn are input to the ADM devices 111-1 to 111-n, respectively. That is, the optical signal of the wavelength λ1 is input to the ADM device 111-1, the optical signal of the wavelength λ2 is input to the ADM device 111-2, and the optical signal of the wavelength λn is input to the ADM device 111-n. .

Each of the ADM devices 111-1 to 111-n outputs n optical signals having wavelengths λ1 to λn. That is, an optical signal of wavelength λ1 is output from the ADM device 111-1, an optical signal of wavelength λ2 is output from the ADM device 111-2,
Each of the ADM devices 111-n outputs an optical signal having a wavelength λn. The n optical signals of wavelengths λ1 to λn output from each of the ADM devices 111-1 to 111-n are
At 05, the signal is amplified by the optical booster amplifier 106 as one optical signal, and then transmitted to the optical fiber transmission line of the counterclockwise operation system via the 4 × 4 optical switch 102. For the optical signal transmitted and received via the clockwise operation system 2-2, the demultiplexing operation of the wavelengths λ1 to λn is performed in the same manner as the above operation. For the clockwise operation system, the optical preamplifier 107, the wavelength separation unit 108, the wavelength multiplexing unit 10
9. The optical booster amplifier 110 is applied.

The above-described optical preamplifier and optical booster amplifier include an amplification optical fiber doped with a rare-earth element and an optical fiber amplifier having an excitation light source for injecting excitation light into the amplification optical fiber and an optical semiconductor. A semiconductor optical amplifier that directly amplifies light injected and input can be used.
In the present embodiment, the wavelength light separation units 104 and 10 are used.
8. All the optical preamplifiers 103 and 107 and the optical booster amplifiers 106 and
Although the configuration in which 110 is provided is shown, a configuration in which a part of these components is removed may be employed.

Next, a description will be given of a recovery operation when a failure occurs in a transmission line or the like in the first embodiment. FIG. 2 shows an explanatory diagram thereof.

In FIG. 2, first, (a) data signals are transmitted / received between the node 2 and the node 5 via two active transmission lines during normal times. At node 2 and node 5,
Data signals are input and output from the low-speed signal interface unit inside the node, and a route is set by the cross-connect unit.

FIG. 2B shows the operation when two working transmission lines are disconnected between the node 2 and the node 3.
In this case, the node 2 inputs and outputs the optical signal, which has been routed so as to be input / output to / from the active transmission line between the nodes 2-3, to / from the standby transmission line between the nodes 2-3. Then, the path is changed by the 4 × 4 optical switch. Also, in the node 3, the optical signal that has been routed so as to be input / output to / from the active transmission line between the nodes 2-3 is input / output to / from the standby transmission line between the nodes 2-3.
The path is changed by the 4 × 4 optical switch. Thereby, communication of the data signal can be secured by avoiding the disconnected transmission path.

An operation system between the node 2 and the node 3
FIG. 2C shows the operation when both transmission paths of the standby system are disconnected. In this case, in node 2, node 2-
4 × 4 optical switch so that an optical signal which has been routed so as to be input / output to / from the working transmission line between the nodes 3 is input / output to / from the standby transmission line between the opposite nodes 2-1. Change the route with. In the node 3, the node 2-3
The optical signal which is routed so as to be input / output to / from the working transmission line between the nodes is switched to the 4 × 4 optical switch so as to be input / output to / from the protection transmission line between the nodes 3-4 on the opposite side. To change the route. Thereby, communication of the data signal can be secured by avoiding the disconnected transmission path.

FIG. 2D shows the operation when the node 3 fails. In this case, in the node 2, the optical signal which has been routed so as to be input / output to / from the active transmission line between the nodes 2-3 is input / output to / from the backup transmission line between the opposite nodes 2-1. In this case, the path is changed by the 4 × 4 optical switch. In the node 4, the optical signal which has been routed so as to be input / output to / from the active transmission line between the nodes 4-3 is input / output to / from the backup transmission line between the opposite nodes 4-5. As described above, the path is changed by the 2 × 2 optical switch. As a result, communication of the data signal can be secured by avoiding the disconnected transmission path.

The 4 × 4 optical matrix switch used in the optical transmission device of the present invention shown in FIG.
Has the configuration shown in FIG. In FIG. 3, 1601
-1 to 1601-4 are optical signal input terminals;
Reference numeral 1602-4 denotes an optical signal output terminal, and reference numeral 1603 denotes a 2 × 2 optical switch element.

In FIG. 3, the input four optical signals are routed while passing through a total of six 2 × 2 optical switch elements, and are routed to any of the output terminals 1602-1 to 1602-4. Is output. For the 2 × 2 optical switch element 1603, a ferroelectric material such as LiNbO3 is usually used.
The 2 × 2 optical switch elements 1603 are usually arranged in a matrix on a substrate, and an optical waveguide is used for connection between the switch elements.

In the wavelength separation section and the wavelength multiplexing section in FIG. 1, an arrayed waveguide diffraction grating (AWG: Arrayed
-Waveguide Grating) is used. FIG. 4 shows the structure of the AWG multiplexer / demultiplexer. The AWG multiplexer / demultiplexer is a planar lightwave circuit (PLC: P
This is an application of a LAN (Light Wave Circuit) technology, and includes a slab waveguide, an AWG, and the like provided on a silicon substrate.

The input wavelength-multiplexed optical signal of wavelengths λ1 to λn is diffracted and spread by the slab waveguide, and is distributed to the AWG with the same phase. Since the AWG has an optical path length difference, it interferes with each other on the output side slab waveguide, and is divided and outputted to the output side waveguide array into lights having different wavelengths. It plays a role like a kind of prism. Also, by inputting optical signals of each wavelength from the output side in the figure, it can also be used as a wavelength multiplexing function. FIG. 5 shows a characteristic example of the AWG multiplexer / demultiplexer.

According to the first embodiment of the present invention, only two high-speed signal transmission / reception interfaces are used in the insertion / separation (ADM) device in each node. It is very inexpensive and can be miniaturized. Further, in the first embodiment, a failure recovery operation is performed by a 4 × 4 optical switch, and there are more paths for avoiding a failure part than in the second conventional technique, so that there is an effect that the reliability is excellent. In the prior art shown in FIG. 20A, even if the failure cannot be avoided, the configuration of the present invention can avoid the failure as shown in FIG. 20B.

Next, a description will be given of a second embodiment having the second basic configuration of the optical communication node of the present invention and the wavelength division multiplexing optical transmission device having the ring configuration constituted by the node.

FIG. 6 is a diagram showing the configuration of a second embodiment of the wavelength division multiplexing optical transmission apparatus having a ring configuration according to the present invention. In FIG. 6, the same reference numerals as in FIG.
This is the same as that described above. For other numbers, 114 and 115 are nxn optical switches.

In FIG. 6, n × n optical switches 114 and 115 for selectively connecting optical signals of wavelengths λ1 to λn are arranged at the subsequent stage of the wavelength separation units 104 and 108, respectively. With this n × n optical switch, an optical signal received from the transmission line is input to an arbitrary insertion / separation device, and the path of the signal is changed. In the configuration shown in FIG.
n-1 is set as the service wavelength, and λn is set as the protection wavelength.
When any one of 11- (n-1) fails, the path is switched to the path passing through the insertion / separation device 111-n.

FIG. 7 shows the operation when the insertion / separation device fails.
Note that in FIG. 7, the components denoted by the same reference numerals as those in FIG. 6 are the same as those described in FIG. For other numbers, 210 to 211 are 2: 1 selectors.

In the configuration shown in FIG. 7, the optical signal of the wavelength λ1 is normally input to the insertion / separation device 111-1 via the n × n optical switch 114, and after insertion and separation of the data signal, It is output again with the optical signal of λ1. Here, when the high-speed signal receiving interface unit 201 in the insertion / separation device 111-1 fails, the n × n optical switch converts the input optical signal of the wavelength λ1 into the insertion / separation device 111-1.
Switch the path to connect to -n. Insertion / separation device 1
The optical signal of wavelength λ1 input to 11-n is subjected to optical / electrical conversion, demultiplexing, insertion / separation of data signals, and electrical / optical conversion, and is output to the transmission line as an optical signal of wavelength λn. The data signal to be separated / inserted into the low-speed signal interface unit is connected in such a manner that the cross-connect unit in the insertion / separation device 111-n is connected to the low-speed signal interface unit 205 in the insertion / separation device 111-1. 1 selector 2
Switch between 10 and 212. The optical signal of the wavelength λn transmitted from the insertion / separation device 111-n is nx in the next node.
The input / separation device 111-1 is switched so as to be input to the insertion / separation device 111-1 by the n optical switch. As a result, communication can be restored while avoiding a failure point of the insertion / separation device.

The operation of the other parts is the same as that in the description of the first embodiment.

According to the configuration of the second embodiment of the present invention, in addition to the effects of the first embodiment, the insertion and separation (A
DM) arbitrarily select a wavelength channel to be input to the device n
It has a × n optical switch, and by providing a protection wavelength, it is possible to recover even from a failure of an insertion / demultiplexing (ADM) device, so that there is an effect that the reliability is further improved.

Next, a description will be given of a third embodiment having the third basic configuration of the optical communication node of the present invention and the wavelength division multiplexing optical transmission apparatus having a ring configuration constituted by the node.

FIG. 8 is a diagram showing the configuration of a third embodiment of the wavelength division multiplexing optical transmission apparatus having a ring configuration according to the present invention. FIG.
In the figure, the components denoted by the same reference numerals as those in FIG. 1 are the same as those described in FIG. For other numbers, 1
50 and 152 are nxp optical switches, 151 and 153 are p
.Times.n optical switches 207 and 208 are high-speed signal interface units having a transmission wavelength setting function.

In the configuration shown in FIG. 8, optical signals of wavelengths λ1 to λn are selectively connected to the subsequent stages of wavelength separation units 104 and 108 for p subsequent insertion and separation devices 111-1 to 111-p. N × p optical switches 150 and 152
Are arranged respectively.

Further, p (p ≧ n) insertion / separation devices 11
The wavelength λ, which is the output of the insertion / separation device, is provided after 1-1 to p.
P × n optical switches 151 and 15 for selectively connecting optical signals of 1 to λn to wavelength multiplexing units 305 and 313
3, and the high-speed signal transmission interface in the insertion / separation device arbitrarily selects the wavelength of the optical signal to be transmitted from λ1 to λn. These n × p and p × n optical switches connect the wavelengths set and output by the insertion / demultiplexing device to predetermined wavelength input ports of the wavelength multiplexing units 105 and 109.

FIG. 9 shows the operation of the third embodiment of the present invention shown in FIG. 8 when the insertion / separation device fails.
In FIG. 9, those denoted by the same reference numerals as those in FIG. 8 are the same as those described in FIG. 8. For other numbers, 210 to 211 are 2: 1 selectors.

In the configuration shown in FIG. 9, the optical signal having the wavelength λ1 is input to the insertion / separation device 111-1 via the n × p optical switch 150 in a normal state, and after the data signal is inserted / separated, the wavelength p × n optical switch 1 with an optical signal of λ1
It is output again via 51. Insertion / separation device 111-1
When the middle high-speed signal reception interface unit 201 fails, the n × p optical switch 150 switches the path so that the input optical signal of the wavelength λ1 is connected to the insertion / separation device 111-p. The optical signal of wavelength λ1 input to the insertion / separation device 111-p is output as an optical signal of wavelength λ1 after being subjected to optical / electric conversion, multiplex separation, insertion / separation of data signal, and electric / optical conversion.

The p × n optical switch 151 changes the path so that the optical signal of the wavelength λ1 input from the insertion / separation device 111-p is output to the λ1 input port of the wavelength multiplexing unit. The data signal to be separated / inserted into the low-speed signal interface unit is connected in such a manner that the cross-connect unit in the insertion / separation device 111-p is connected to the low-speed signal interface unit 205 in the insertion / separation device 111-1. 1
The selectors 210 to 212 are switched. As a result, communication can be restored while avoiding a failure point of the insertion / separation device. The operation of the other parts is the same as that described in the first embodiment of the present invention.

According to the third embodiment of the present invention, in addition to the effects of the first embodiment, each wavelength signal received from the transmission line is input to an arbitrary insertion / separation device, and each insertion / separation ( Since the wavelength output from the ADM device can be arbitrarily set, n: (p−
The redundancy configuration of n) can be obtained, and there is an effect that the reliability is excellent. In addition, since the recovery operation at the time of the insertion / separation (ADM) device failure can be performed in a closed operation within the failed node, there is an effect that the operability is excellent.

Next, a description will be given of a fourth embodiment having the fourth basic configuration of the optical communication node of the present invention and the wavelength division multiplexing optical transmission apparatus having a ring configuration constituted by the node.

FIG. 10 is a diagram showing the configuration of a fourth embodiment of the wavelength division multiplexing optical transmission apparatus having a ring configuration according to the present invention.
In FIG. 4, the components denoted by the same reference numerals as those in FIG. 1 are the same as those described in FIG. For other numbers, 118 and 119 are 2 × 2 optical switches, 120 and 12
Reference numeral 1 denotes a multiplexing terminal device.

In FIG. 10, of the optical signals of wavelengths λ1 to λn output from the wavelength demultiplexing units 104 and 108, only λ1 is demultiplexed / inserted, and the other wavelengths are directly input to the wavelength multiplexing units 105 and 109. Optical booster amplifier 10
The signal is output to the transmission line via the 6,110 and 4 × 4 optical switches 101 and 102. Wavelength separation units 104 and 108
Are output to the 2 × 2 optical switch, and are selectively connected to the two multiplexing terminal devices 120 and 121. Multiplexing terminal equipment 120,1
In 21, the input optical signal is subjected to optical / electrical conversion, demultiplexing, and electric / optical conversion to generate and output an optical signal of wavelength λ1. The optical signals output from the multiplexing terminal devices 120 and 121 are selectively connected to the wavelength multiplexing units 105 and 109 by a 2 × 2 optical switch 119.

In the fourth embodiment of the present invention, communication between each node is set in wavelength units. That is, when communication is performed between the node 1 and the node 3, both the nodes 1 and 3 are set to perform insertion / separation of the same wavelength.

FIG. 2 shows the operation at the time of transmission line failure.
As shown in (1), the operation is the same as in the first embodiment.

According to the fourth embodiment of the present invention, in addition to the effects of the above-described first embodiment, wavelength signals for which it is not necessary to separate / insert a data signal in a node are transmitted as optical signals. And a cross-connect operation by a 2 × 2 optical switch, and a multiplexing terminal device without a cross-connect unit is used instead of an insertion / demultiplexing (ADM) device. The effect of being able to provide is obtained.

Next, a description will be given of a fifth embodiment having a fifth basic configuration of the optical communication node of the present invention and the wavelength division multiplexing optical transmission device having a ring configuration constituted by the node.

FIG. 11 is a diagram showing the configuration of a fourth embodiment of the wavelength division multiplexing optical transmission apparatus having a ring configuration according to the present invention.
In FIG. 5, 1-1 to 1-m are optical insertion separation nodes, 2
-1-2 are transmission line optical fibers (2-1: counterclockwise, 2
-2: clockwise), 301 is the first optical preamplifier, 30
2 is a first optical splitter, 303 is a first 2 × 1 optical switch, 304 is a first wavelength demultiplexing unit, 305 is a first wavelength multiplexing unit, 306 is a first 1 × 2 optical switch, 307 Is the first
308 is a first optical booster amplifier, 30
9 is a second optical preamplifier, 310 is a second optical splitter, 3
11 is a second 2 × 1 optical switch, 312 is a second wavelength demultiplexing unit, 313 is a second wavelength multiplexing unit, and 314 is a second 1 × 1 optical switch.
The two optical switch, 315 is the second optical coupler, and 316 is the second optical coupler.
Optical booster amplifiers, 317-1 to 317-n, are inserted and separated (A
DM) devices, 401 and 402 are high-speed signal reception interface units, 403 and 404 are high-speed signal transmission interface units, 405 is a low-speed signal interface unit, and 406 is a cross-connect unit.

In FIG. 11, m nodes are bidirectionally connected in a ring by two transmission line optical fibers. The operation of each node in the normal state, that is, when no failure occurs in the network, is as follows.
That is, from each node, an optical signal obtained by wavelength division multiplexing n wavelengths of the wavelengths λ1 to λn in the counterclockwise direction with respect to the two optical fiber transmission lines is converted into the wavelength λn in the clockwise direction.
+1 to .lambda.n + n, and transmits an optical signal obtained by wavelength division multiplexing the n wavelengths.
An optical signal in which n wavelengths of .about..lambda.n are wavelength division multiplexed, and an optical signal in which n wavelengths of wavelengths .lambda.n + 1 to .lambda.n + n are wavelength division multiplexed from the clockwise direction are received.

The optical signal received from the counterclockwise transmission line optical fiber is amplified by the optical preamplifier 301, and the optical signal received from the clockwise transmission line optical fiber is amplified by the optical preamplifier 310.
The two optical signals are amplified by the optical splitter 302,
310 and 2 × 1 optical switches 303 and 311 are connected in a confounding manner and input to the wavelength separation units 304 and 312. The wavelength separation unit 304 converts the input optical signal into a wavelength λ1
To λn, and the wavelength separation unit 312 separates the input optical signal into n wavelength components of wavelengths λn + 1 to λn + n. The wavelength-separated optical signals of λ1 to λn and λn + 1 to λn + n are input to the ADM devices 317-1 to 317-n, respectively. That is, optical signals of wavelengths λ1 and λn + 1 are input to the ADM device 317-1, optical signals of wavelengths λ2 and λn + 2 are input to the ADM device 317-2, and optical signals of wavelengths λn and λn + n are input to the ADM device 317-n. An optical signal is input.

The ADM devices 317-1 to 317-n output optical signals of wavelengths λ1 to λn and λn + 1 to λn + n. That is, the optical signals of the wavelengths λ1 and λn + 1 are output from the ADM device 317-1.
The optical signals of the wavelengths λ2 and λn + 2 are output from the ADM device 31.
7-n output optical signals of wavelengths λn and λn + n, respectively. Of the signals output from the ADM units 317-1 to 317-n, n optical signals of wavelengths λ1 to λn are wavelength division multiplexed by the wavelength multiplexing unit 305, and the wavelengths λn + 1 to λn
The n optical signals of + n are wavelength division multiplexed by the wavelength multiplexing unit 314. The optical signal from the wavelength multiplexing unit 305 is selected and output from the optical coupler 307 or 315 by the 1 × 2 optical switch 306, and the optical signal from the wavelength multiplexing unit 314 is optically coupled by the 1 × 2 optical switch 314. One of the devices 307 or 315 is selected and output. Optical coupler 3
The optical signal combined at 07 is supplied to the optical booster amplifier 30.
The optical signal amplified at 8 is output to the counterclockwise transmission line, and the optical signal combined by the optical coupler 315 is amplified by the optical booster amplifier 316 and output to the clockwise transmission line.

Next, a description will be given of a recovery operation when a failure occurs in a transmission line or the like in the fifth embodiment of the present invention shown in FIG. FIG. 12 shows an explanatory diagram thereof.

In FIG. 12, (a) at normal time,
Data signals are transmitted and received between the node 2 and the node 5 via two bidirectional transmission lines. In nodes 2 and 5, data signals are input / output from a low-speed signal interface unit inside the node, and a route is set in a cross-connect unit.

FIG. 12B shows the operation when the clockwise transmission line is disconnected between the nodes 2 and 3.
In this case, the node 3 couples the optical signal, which has been routed to be output to the clockwise transmission path side between the nodes 2-3, to the counterclockwise transmission path side between the nodes 3-4. The path is changed by the 1 × 2 optical switch 314. In the node 2, a 2 × 1 optical switch is connected so that the optical signal that has been routed so as to be input from the clockwise transmission line between the nodes 2-3 is input from the counterclockwise transmission line between the nodes 1-2. At 311 the route is changed. Thereby, communication of the data signal can be secured by avoiding the disconnected transmission path.

FIG. 12C shows the operation when both the clockwise and counterclockwise transmission lines are disconnected between the nodes 2 and 3. In this case, in addition to the operation performed in FIG.
The optical signal that has been routed so as to be output to the counterclockwise transmission line side between the third and third channels is routed by the 1 × 2 optical switch 306 so as to be output to the clockwise transmission line side between 1-2. A change is made so that the optical signal which has been route-connected at the node 5 so as to be input from the counterclockwise transmission path between the nodes 5 and 4 is input from the clockwise transmission path between the nodes 5 and 6 so that The path is changed by the × 2 optical switch 303. Thereby, communication of the data signal can be secured by avoiding the disconnected transmission path.

FIG. 12 shows the operation when the node 3 fails.
(D). In this case, in the node 4, the nodes 4-3
The 1 × 2 optical switch 314 changes the path of the optical signal that has been routed so as to be output to the clockwise transmission path between the nodes 4 and 5 so as to be coupled to the counterclockwise transmission path between the nodes 4 and 5. I do. In the node 2, a 2 × 1 optical switch is connected so that an optical signal routed so as to be input from the clockwise transmission line side between the nodes 2-3 is input from the counterclockwise transmission line side between the nodes 1-2. At 311, the path is changed, and the optical signal that has been routed so as to be output to the counterclockwise transmission path between the nodes 2-3 is output to the clockwise transmission path between the nodes 1-2. As described above, the path is changed by the 1 × 2 optical switch 306. Further, at the node 5, the optical signal which has been route-connected so as to be input from the counterclockwise transmission path between the nodes 5-4 is input to the 1 × so as to be input from the clockwise transmission path between the nodes 5-6.
The path is changed by the two-optical switch 303. This allows
Communication of the data signal can be secured by avoiding the disconnected transmission path.

According to the fifth embodiment of the present invention, only two high-speed signal transmission / reception interface units are used in the insertion / separation (ADM) device in each node. It is very inexpensive and can be miniaturized. In addition, the wavelength channels for normal transmission are separately set for the clockwise transmission line and the counterclockwise transmission line, and when a failure occurs, the route can be avoided on each transmission line, so that only two transmission line fibers are required. The effect is that the economy of the entire network is excellent.

Next, a description will be given of a sixth embodiment of the optical communication node according to the present invention and the sixth basic configuration of the wavelength division multiplexing optical transmission device having a ring configuration constituted by the optical communication node.

FIG. 13 is a diagram showing the configuration of a sixth embodiment of the wavelength division multiplexing optical transmission apparatus having a ring configuration according to the present invention.
In FIG. 13, the same reference numerals as in FIG.
This is the same as that described in 1. For other numbers, 318 and 319 are n × n optical switches.

In FIG. 13, wavelength separation units 304 and 31
The n × n optical switches 318 and 319 for selectively connecting the optical signals of the wavelengths λ1 to λn and λn + 1 to λn + n are arranged at the subsequent stage of 2, respectively. With this n × n optical switch, an optical signal received from the transmission line is input to an arbitrary insertion / separation device, and the path of the signal is changed. In FIG.
λ1 to λn-1 and λn + 1 to λn + (n-1) are set as service wavelengths, and λn and λn + n are set as protection wavelengths.
If any one of .about.317- (n-1) fails, the path is switched to the path passing through the insertion / separation device 317-n.

The operation at the time of failure of the insertion / separation device is the same as the operation described with reference to FIG. 7 in the second embodiment of the present invention.

The operation of the other parts is the same as that described in the fifth embodiment of the present invention.

According to the sixth embodiment of the present invention, in addition to the effects of the above-described fifth embodiment, insertion separation (ADM)
Since an nxn optical switch for arbitrarily selecting a wavelength channel to be input to the device is provided, by providing a protection wavelength, it is possible to recover from the failure of the insertion / separation (ADM) device. There is an effect that the reliability is excellent.

Next, a description will be given of a seventh embodiment of the optical communication node of the present invention and the seventh basic configuration of the wavelength division multiplexing optical transmission apparatus having the ring configuration constituted by the optical communication node.

FIG. 14 is a diagram showing the configuration of a seventh embodiment of the wavelength division multiplexing optical transmission apparatus having a ring configuration according to the present invention.
In FIG. 14, the components denoted by the same reference numerals as those in FIG. 11 are the same as those described in FIG. 11 and FIG. For other numbers, 350 and 352 are nxp optical switches,
Reference numerals 351 and 353 denote p × n optical switches, and 407 and 408 denote high-speed signal interface units having a transmission wavelength setting function.

In FIG. 14, the wavelengths λ1 to λn or λn + 1 to n +
The n optical signals are transmitted to the subsequent p insertion / separation devices 317-1 to 317-1.
n × p optical switches 150 and 152 selectively connected to p are arranged.

Also, p (p ≧ n) insertion / separation devices 31
The wavelength λ, which is the output of the insertion / separation device, is provided after 7-1 to p.
The p × n optical switches 315 and 353 for selectively connecting the optical signals of 1 to λn or λn + 1 to λn + n to the wavelength multiplexing units 305 and 313 are arranged, respectively. Λ1 to λn or λn + 1 to λn + n are arbitrarily selected. These n × p and p × n optical switches connect the wavelengths set and output by the insertion / demultiplexing device to predetermined wavelength input ports of the wavelength multiplexing units 305 and 313.

The operation at the time of failure of the insertion / separation device is the same as the operation shown in FIG. 9 described in the third embodiment of the present invention.

The operation of the other parts is the same as that described in the fifth embodiment of the present invention.

According to the seventh embodiment of the present invention, in addition to the effects of the fifth embodiment, each wavelength signal received from the transmission line is input to an arbitrary insertion / separation device, and each insertion / separation ( Since the wavelength output from the ADM device can be arbitrarily set, n: (p−
The redundancy configuration of n) can be obtained, and there is an effect that the reliability is excellent. In addition, since the recovery operation at the time of the insertion / separation (ADM) device failure can be performed in a closed operation within the failed node, there is an effect that the operability is excellent.

Next, a description will be given of an eighth embodiment of the optical communication node according to the present invention and the eighth basic configuration of the wavelength division multiplexing optical transmission device having a ring configuration constituted by the optical communication node.

FIG. 15 is a diagram showing the configuration of an eighth embodiment of the wavelength division multiplexing optical transmission apparatus having a ring configuration according to the present invention.
In FIG. 15, components denoted by the same reference numerals as those in FIG. 11 are the same as those described in FIG. For other numbers, 324 and 325 are 2 × 2 optical switches, 32
Reference numeral 2,323 denotes a multiplexing terminal device.

In FIG. 15, wavelengths λ1 to λn and λn + 1 to λn + n output from wavelength separation units 304 and 312 are shown.
Out of the optical signal, only λ1 and λn + 1 are separated / inserted, and the other wavelengths are directly
3 and 1 × 2 optical switches 306 and 314, optical couplers 307 and 315, and optical booster amplifiers 308 and 3
16 to the transmission path. Optical signals 2 of wavelengths λ1 and λn + 1 output from wavelength separation units 304 and 308
The book is input to the 2 × 2 optical switch 324 and is selectively connected to the two multiplexing terminal devices 322 and 323.
The multiplexing terminal devices 322 and 323 perform optical / electrical conversion, demultiplexing, and electrical / optical conversion on the input optical signals, respectively, and generate and output optical signals of wavelengths λ1 and λn + 1, respectively. The optical signals output from the multiplexing terminal devices 322 and 323 are selectively connected to the wavelength multiplexing units 305 and 313 by the 2 × 2 optical switch 325.

In the eighth embodiment, communication between nodes is set in units of wavelength. That is, when communication is performed between the node 1 and the node 3, both the node 1 and the node 3 are set to perform insertion and separation of the same wavelength.

The operation at the time of transmission line failure is the same as that of the fifth embodiment shown in FIG.

According to the eighth embodiment of the present invention, in addition to the effects of the above-described fifth embodiment, wavelength signals for which it is not necessary to separate / insert a data signal in a node are transmitted as optical signals. The multiplexed terminal device having no cross-connect unit is used instead of the ADM device, so that a more inexpensive system can be realized. There is an effect that it can be provided.

[0139]

As described above, according to the optical communication node of the present invention and the wavelength division multiplexing optical transmission apparatus having the ring configuration constituted by the same, the insertion and separation (AD) in each node is performed.
M) Since only two high-speed signal transmission / reception interface units are used in the device, it is possible to make the device very inexpensive and miniaturized as compared with the first conventional technique. Further, in the first embodiment, the failure recovery operation is performed by the 4 × 4 optical switch, and the number of paths for avoiding the failure portion is larger than that in the second prior art, so that there is an effect that the reliability is excellent.

Further, it has an n × n optical switch for arbitrarily selecting a wavelength channel to be input to the insertion / demultiplexing (ADM) device. By providing a protection wavelength, it is possible to prevent failure of the insertion / demultiplexing (ADM) device. However, since recovery can be performed, there is an effect that reliability is further improved.

Further, each wavelength signal received from the transmission line can be input to an arbitrary insertion / separation device, and the wavelength output from each insertion / separation (ADM) device can be set arbitrarily. Therefore, a redundant configuration of n: (pn) can be obtained, and there is an effect that the reliability is excellent. In addition, since the recovery operation at the time of the insertion / separation (ADM) device failure can be performed in a closed operation within the failed node, there is an effect that the operability is excellent.

A wavelength signal that does not require a data signal to be separated / inserted in the node is output as an optical signal to the transmission line, and a cross-connect operation is performed by a 2 × 2 optical switch to perform insertion / demultiplexing (ADM). Since a multiplexing terminal device having no cross-connect section is used instead of the device, there is an effect that a more inexpensive system can be provided.

Since only two high-speed signal transmission / reception interface units are used in the insertion / separation (ADM) device,
It is very inexpensive and can be miniaturized as compared with the first prior art. In addition, the wavelength channels for normal transmission are separately set for the clockwise transmission line and the counterclockwise transmission line, and when a failure occurs, the route can be avoided on each transmission line, so that only two transmission line fibers are required. There is also an effect that the economy as a whole network is excellent. Since it has an n × n optical switch for arbitrarily selecting a wavelength channel to be input to the insertion / demultiplexing (ADM) device, by providing a protection wavelength, it is possible to recover from the failure of the insertion / demultiplexing (ADM) device. Since it can be performed, there is also an effect that the reliability is excellent.

Each wavelength signal received from the transmission line is input to an arbitrary insertion / separation device, and the wavelength output from each insertion / separation (ADM) device can be set arbitrarily. Therefore, a redundant configuration of n: (pn) can be obtained, and there is an effect that the reliability is excellent. In addition, since the recovery operation at the time of the insertion / separation (ADM) device failure can be performed in a closed operation within the failed node, there is an effect that the operability is excellent.

Further, wavelength signals for which it is not necessary to separate / insert a data signal in a node are output to the transmission line as optical signals, and a cross-connect operation is performed by a 2 × 2 optical switch to perform insertion / demultiplexing (ADM). Since a multiplexing terminal device having no cross-connect section is used instead of the device, there is an effect that a more inexpensive system can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing the configuration of a first embodiment of a wavelength division multiplexing optical transmission device having a ring configuration according to the present invention.

FIG. 2 is a diagram for explaining a recovery operation when a failure occurs in the first embodiment of the wavelength division multiplexing optical transmission device having a ring configuration according to the present invention.

FIG. 3 is a diagram showing an example of the configuration of a 4 × 4 optical switch used in a first embodiment of the wavelength division multiplexing optical transmission device having a ring configuration according to the present invention.

FIG. 4 is a diagram showing an example of a configuration of an AGW multiplexing / demultiplexing module used in a first embodiment of the wavelength division multiplexing optical transmission device having a ring configuration according to the present invention.

5 is a diagram illustrating a characteristic example of the AGW multiplexing / demultiplexing module illustrated in FIG. 4;

FIG. 6 is a diagram illustrating a configuration of a second embodiment of the wavelength division multiplexing optical transmission device having a ring configuration according to the present invention.

FIG. 7 is a diagram for explaining a recovery operation when a failure occurs in the second embodiment of the wavelength division multiplexing optical transmission device having a ring configuration according to the present invention.

FIG. 8 is a diagram showing the configuration of a third embodiment of the wavelength division multiplexing optical transmission device having a ring configuration according to the present invention.

FIG. 9 is a diagram for explaining a recovery operation when a failure occurs in a third embodiment of the wavelength division multiplexing optical transmission device having a ring configuration according to the present invention.

FIG. 10 is a diagram showing the configuration of a fourth embodiment of the wavelength division multiplexing optical transmission device having a ring configuration according to the present invention.

FIG. 11 is a diagram showing the configuration of a fifth embodiment of the wavelength division multiplexing optical transmission device having a ring configuration according to the present invention.

FIG. 12 is a diagram for explaining a recovery operation when a failure occurs in a fifth embodiment of the wavelength division multiplexing optical transmission device having a ring configuration according to the present invention.

FIG. 13 is a diagram showing a configuration of a sixth embodiment of the wavelength division multiplexing optical transmission device having a ring configuration according to the present invention.

FIG. 14 is a diagram showing the configuration of a seventh embodiment of the wavelength division multiplexing optical transmission device having a ring configuration according to the present invention.

FIG. 15 is a diagram showing the configuration of an eighth embodiment of the wavelength division multiplexing optical transmission device having a ring configuration according to the present invention.

FIG. 16 is a diagram illustrating a configuration of an optical transmission device according to a first conventional technique.

FIG. 17 is a diagram for explaining a recovery operation when a failure occurs in the optical transmission device of the first conventional technique.

FIG. 18 is a diagram showing a configuration of an optical transmission device according to a second conventional technique.

FIG. 19 is a diagram for explaining a recovery operation when a failure occurs in the optical transmission device of the second conventional technique.

FIG. 20 is a diagram for explaining states when a failure occurs in each of the optical transmission device according to the related art and the wavelength division multiplexing optical transmission device having the ring configuration of the present invention.

[Explanation of symbols]

1-1 to 1-m Optical insertion / separation node 2-1 to 4 Transmission line optical fiber (2-1: counterclockwise operation system, 2-2: clockwise operation system, 2-3: clockwise backup system, 2-4: counterclockwise standby system), 101,102 4 × 4 optical switch 103 first optical preamplifier 104 first wavelength demultiplexing unit 105 first wavelength multiplexing unit 106 first optical booster amplifier 107 second Optical preamplifier 108 Second wavelength demultiplexing unit 109 Second wavelength multiplexing unit 110 Second optical booster amplifiers 111-1 to n Insertion and demultiplexing (ADM) devices 112 and 113 Optical repeater amplifiers 201 and 202 High-speed signal receiving interface unit 203, 204 High-speed signal transmission interface unit 205 Low-speed signal interface unit 206 Cross-connect unit 114, 115 n × n optical switch 150, 152 n × p optical switch 151,153 p × n optical switch 207,208 High-speed signal interface unit with transmission wavelength setting function 118,119 2 × 2 optical switch 120,121 Multiplexing terminal equipment 1-1-1-1-m Optical insertion / demultiplexing node 2 -1 to 2 transmission line optical fiber (2-1: counterclockwise,
(2-2: clockwise) 301 first optical preamplifier 302 first optical splitter 303 first 2 × 1 optical switch 304 first wavelength separation unit 305 first wavelength multiplexing unit 306 first 1 × 2 Optical switch 307 First optical coupler 308 First optical booster amplifier 309 Second optical preamplifier 310 Second optical splitter 311 Second 2 × 1 optical switch 312 Second wavelength demultiplexer 313 Second wavelength Multiplexing unit 314 Second 1 × 2 optical switch 315 Second optical coupler 316 Second optical booster amplifier 317-1 to n Insertion / separation (ADM) device 401,402 High-speed signal reception interface unit 403,404 High-speed signal transmission Interface section 405 Low-speed signal interface section 406 Cross-connect section 318,319 nxn optical switch 350,352 nxp optical switch 3 51,353 p × n optical switch 407,408 High-speed signal interface unit with transmission wavelength setting function 324,325 2 × 2 optical switch 322,323 Multiplexing terminal equipment 901-1 to 901-m Optical insertion / demultiplexing node 902 1-4 Transmission line optical fiber (902-1: counterclockwise operation system, 902-2: clockwise operation system, 902-
951: Optical clock preamplifier 952 Wavelength separation unit 953 Wavelength multiplexing unit 954 Optical booster amplifier 954 Optical preamplifier 957 Wavelength separation unit 957 Wavelength multiplexing unit 958 Optical booster amplifier 959 Optical preamplifier 960 Wavelength separation unit 961 Wavelength multiplexing unit 962 Optical booster amplifier 963 Optical preamplifier 964 Wavelength separation unit 965 Wavelength multiplexing unit 966 Optical booster amplifier 967-1-n Insertion / separation (ADM) device 971-974 High-speed signal receiving interface unit 975-978 High-speed Signal transmission interface unit 979 Cross-connect unit 980 Low-speed signal interface unit 901-1 to 901-m Optical insertion separation node 902-1 to 4 Transmission line optical fiber (902-1: counterclockwise operation system, 902-2: clockwise operation) Operating system, 902-
1001 Optical preamplifier 1002 Wavelength separation unit 1003 Wavelength multiplexing unit 1004 Optical booster amplifier 1005 Optical preamplifier 1006 Wavelength separation unit 1007 Wavelength multiplexing unit 1008 Optical booster amplifier 1009-1 To n insertion / separation (ADM) device 1010, 1011 optical repeater amplifier 1012 to 1015 2 × 2 optical switch 1051, 1054 high-speed signal reception interface unit 1052, 1053 high-speed signal transmission interface unit 1055 cross-connect unit 1056 low-speed signal interface unit 1601-1 1601-4 Optical signal input terminal 1602-1 to 1602-4 Optical signal output terminal 1603 2 × 2 optical switch element 210-211 2 × 1 selector 210-211 2 × 1 selector

Claims (29)

[Claims] An optical signal input from a clockwise optical transmission line input terminal and an output terminal, a counterclockwise optical transmission line input terminal and an output terminal, and having wavelength components of wavelengths λ1 to λn, respectively, input from the input terminal. A first wavelength demultiplexing means for demultiplexing the wavelength-multiplexed first input optical signal for each wavelength component and outputting n first wavelength demultiplexed light composed of each wavelength component; First wavelength multiplexing means for wavelength multiplexing each optical signal having wavelength components of wavelengths λ1 to λn and outputting a first multiplexed optical signal; A second input optical signal in which optical signals having wavelength components of λn + 1 to λn + n are wavelength-multiplexed is wavelength-separated for each wavelength component, and n second wavelength-separated lights composed of each wavelength component are output. Second wavelength separating means for performing Second wavelength multiplexing means for wavelength-multiplexing each optical signal having a wavelength component of each of wavelengths λn + 1 to λn + n to output a second multiplexed optical signal; Out of the second wavelength separated light, the first wavelength separated light having a wavelength component of wavelength λi (1 ≦ i ≦ n) and the wavelength having a wavelength component of wavelength λi + n corresponding to the first wavelength separated light. A first wavelength separation light input unit and a second wavelength separation light input unit to which a second wavelength separation light is respectively input, and the wavelength λi (1 ≦ i ≦ n)
And a second add optical signal having a wavelength component of wavelength λi + n corresponding to the first add optical signal having the same wavelength as that of the first add optical signal. A first output unit that outputs a second add optical signal to the first wavelength multiplexing unit and the second wavelength multiplexing unit, respectively;
N insertion / separation units each including an insertion optical signal input unit and a second insertion optical signal input unit; and disposed between the counterclockwise optical transmission line and the first wavelength separation unit; A first optical branching unit that branches a part of the first input optical signal output from the counterclockwise optical transmission line and outputs a first branched input optical signal; A second wavelength division unit that is disposed between the second wavelength division unit and branches a part of the second input optical signal output from the clockwise optical transmission line to output a second branched input optical signal; An optical branching unit; a first 2 × that selects the first input optical signal and the second branched input optical signal and inputs the selected signal to the first wavelength separation unit;
One optical switch, and a second 2 ×, which selects the second input optical signal and the first branch input optical signal and inputs the selected signal to the second wavelength separating means.
One optical switch; first optical coupling means for coupling the first multiplexed optical signal and the second branch multiplexed optical signal; and the second multiplexed optical signal and the first branch multiplexing A second optical coupling unit that couples the first multiplexed optical signal with the first optical coupling unit; and a second optical coupling unit that couples the first multiplexed optical signal to the first wavelength multiplexing unit. And a first 1 × 2 optical path selecting means for selecting and outputting to the second optical coupling means, and being disposed between the second wavelength multiplexing means and the second optical coupling means. And a second 1 × 2 optical path selecting means for selecting and outputting the second multiplexed optical signal to the second optical coupling means and the first optical coupling means. Communication node. 2. Each of the nodes is further disposed between the counterclockwise optical transmission line and the first wavelength demultiplexing unit, and optically amplifies the input first input optical signal to form the second node. A first pre-optical amplifier for outputting to the first wavelength demultiplexing means, and a second pre-optical amplifier disposed between the clockwise optical transmission line and the second wavelength demultiplexing means for optically amplifying the input second input optical signal. 2. The optical communication node according to claim 1, further comprising: a second pre-optical amplifier that outputs the signal to the second wavelength separation unit. 3. Each of said nodes is further disposed between said first wavelength multiplexing means and said counterclockwise optical transmission line, and optically amplifies said first multiplexed optical signal to produce said signal. A first booster optical amplifier that outputs to the clockwise optical transmission line; and a second booster optical amplifier disposed between the second wavelength multiplexing unit and the clockwise optical transmission line, and optically amplifies the second multiplexed optical signal. And a second booster optical amplifier that outputs the clock signal to the clockwise optical transmission line.
The optical communication node as described in the above. 4. An optical-electrical converting means for converting the first wavelength-separated light and the second wavelength-separated light into electric signals, respectively, wherein the n insertion / separation means; A first receiving interface unit and a second receiving interface unit for performing an overhead terminating operation and a separating operation on the light and the second wavelength-separated light, respectively; A first transmission interface unit and a second transmission interface unit that perform insertion and generate and output an optical signal having the same wavelength λi as the optical signal input to the reception interface. The optical communication node according to any one of claims 1 to 3, wherein: 5. The n insertion / separation units enter via the first transmission interface unit and the first reception interface and the second transmission interface unit and the second reception interface, respectively. A low-speed signal interface unit for transmitting and receiving at least a part of the output data signal; two pairs of electric data signals input from the first reception interface unit and the second reception interface unit; The two pairs of electrical data signals output to the transmission interface unit and the second transmission interface unit are selectively connected according to the failure state of the optical transmission line or the node, and the first transmission interface unit and the A first receiving interface, the second transmitting interface unit, and the second receiving interface; Optical communication node according to claim 4, characterized in that it comprises a cross-connect unit at least partially separated or inserted to be output to the low-speed interface unit to the data signal to be input and output. 6. The respective nodes are further disposed downstream of the first wavelength demultiplexing means, and each of the nodes inserts n optical signals of wavelengths λ1 to λn inputted from the first wavelength demultiplexing means into the n number of the insertions. A first n × n optical switch selectively connected to the demultiplexing means; and a wavelength λ1 to λn input from the second wavelength demultiplexing means and arranged at a stage subsequent to the second wavelength demultiplexing means. The apparatus according to any one of claims 52 to 5, further comprising a second (nxn) optical switch for selectively connecting an optical signal to the n insertion / separation units. 4. The optical communication node according to item 1. 7. Each of the nodes includes p (p is an integer equal to or larger than n, the same applies hereinafter) insertion / separation units including the n insertion / separation units, further comprising: Disposed at a subsequent stage, and n optical signals of wavelengths λ1 to λn are input from the wavelength separating means,
A first selectively connected to the p insertion / separation means;
An n × p optical switch, and n optical signals of wavelengths λ1 to λn are input from the wavelength separation unit,
A second selectively connected to the p insertion / separation means;
And an n × p optical switch, which is arranged before the first wavelength multiplexing means, receives p optical signals from the respective insertion / demultiplexing means, and is connected to each input terminal of the first wavelength multiplexing means. A first p × n optical switch selectively connected to the second wavelength multiplexing means, and p optical signals from each of the insertion / demultiplexing means are provided; 6. The apparatus according to claim 1, further comprising: a first p × n optical switch selectively connected to each input terminal of the wavelength multiplexing means. Optical communication node. 8. The apparatus according to claim 1, wherein each of the insertion / separation units further includes a wavelength selection unit that selects a wavelength of an optical signal from the wavelengths λ1 to λn. Optical communication node. 9. Each of the nodes further includes: a first first wavelength-separated light of n pieces of the first wavelength-separated light; and a node of n pieces of the second wavelength-separated light. The first and second wavelength-separated lights are selectively switched to each other, and the first wavelength-separated light input section of the first one of the n insertion-separation means and the second wavelength-separated light is connected to the second one. 9. The optical communication node according to claim 1, further comprising a receiving side 2 × 2 optical switch for outputting to the insertion / separation unit. 10. Each of the nodes further comprises: a first first add optical signal of n first add optical signals; and a n first add optical signal of n second add optical signals. A transmission side 2 × 2 optical switch for selectively switching between the first and second insertion optical signals and outputting the signals to the first wavelength multiplexing means and the second wavelength multiplexing means is provided. The optical communication node according to claim 9, wherein: 11. The first wavelength separating means and the second wavelength separating means.
The optical communication node according to any one of claims 1 to 10, wherein each of the wavelength separation means includes an array waveguide diffraction grating. 12. The apparatus according to claim 1, wherein said first wavelength multiplexing means and said second wavelength multiplexing means each include an array waveguide diffraction grating.
An optical communication node according to claim 1. 13. The first pre-optical amplifier and the second pre-optical amplifier.
3. The optical communication node according to claim 2, wherein each of the pre-optical amplifiers includes an optical fiber amplifier. 14. The first pre-optical amplifier and the second pre-optical amplifier.
3. The optical communication node according to claim 2, wherein each of the pre-optical amplifiers includes a semiconductor optical amplifier. 15. The optical amplifier according to claim 3, wherein each of the first booster optical amplifier and the second booster optical amplifier comprises an optical fiber amplifier. An optical communication node according to claim 1. 16. The optical amplifier according to claim 3, wherein each of the first booster optical amplifier and the second booster optical amplifier includes a semiconductor optical amplifier. An optical communication node according to claim 1. 17. The clockwise optical transmission line input terminal and the clock of the node for optical communication according to any one of claims 1 to 16, wherein m of the nodes for optical communication according to any one of claims 1 to 16 are arranged. The output end of the clockwise optical transmission line, the input end of the counterclockwise optical transmission line, and the output end of the counterclockwise optical transmission line are connected by a clockwise optical transmission line and a counterclockwise optical transmission line, respectively, and are formed in a ring shape. A wavelength-division multiplexing optical transmission device having a ring configuration. 18. A clockwise optical transmission line input terminal and a clockwise optical transmission line output terminal, a counterclockwise optical transmission line input terminal and a counterclockwise optical transmission line output terminal, and a wavelength λ1 input from the input terminal. To λn, and demultiplexes the first input optical signal wavelength-multiplexed with the optical signal having each wavelength component for each wavelength component to output n first wavelength-separated lights composed of each wavelength component. A first wavelength demultiplexing unit, and a first wavelength multiplexing unit that wavelength multiplexes each optical signal having wavelength components of wavelengths λ1 to λn input from an input terminal and outputs a first multiplexed optical signal. A second input optical signal obtained by wavelength-multiplexing an optical signal having wavelength components of wavelengths λn + 1 to λn + n input from an input terminal and wavelength-division-multiplexed each of the wavelength components to be composed of each wavelength component. A second wave that outputs n second wavelength-separated lights Demultiplexing means, and second wavelength multiplexing means for wavelength-multiplexing each optical signal having wavelength components of wavelengths λn + 1 to λn + n input from the input terminal and outputting a second multiplexed optical signal, First receiving means for converting the inputted optical signal into an electric signal, second receiving means for converting the inputted optical signal into an electric signal, and first transmitting means for converting the electric signal into an optical signal and outputting the same. And at least one insertion / separation unit including a second transmission unit for converting an electric signal into an optical signal and outputting the converted signal, and a first wavelength separation unit for at least one of the n first wavelength separation lights. Light and a wavelength λi + n corresponding to the wavelength λi of the first wavelength-separated light.
And the second wavelength-separated light having the wavelength component of
Or a receiving side 2 × 2 optical switch for outputting to the first receiving means or the second receiving means of the insertion / separation means corresponding to the wavelength λi + n, and the n out of the first inserted optical signals A first insertion optical signal corresponding to a wavelength λi of one first wavelength-separated light; and the wavelength λi + n among n pieces of the second insertion optical signals.
A transmission side 2 × 2 optical switch that selectively switches between a second add optical signal having a wavelength component of each other and outputs the signals to a first wavelength multiplexing unit and the second wavelength multiplexing unit; A first branching unit that is disposed between the counterclockwise optical transmission line and the first wavelength separation unit and that branches a part of the first input optical signal output from the counterclockwise optical transmission line to form a first branch; A first optical branching unit that outputs an input optical signal; a second input that is disposed between the clockwise optical transmission line and the second wavelength separation unit and that is output from the clockwise optical transmission line. A second optical branching unit for branching a part of the optical signal and outputting a second branched input optical signal; and selecting the first input optical signal and the second branched input optical signal and selecting the second The first 2 × input to one wavelength separation means
One optical switch, and a second 2 × that selects the second input optical signal and the first branch input optical signal and inputs the selected signal to the second wavelength separating unit.
One optical switch; first optical coupling means for coupling the first multiplexed optical signal and the second branch multiplexed optical signal; and the second multiplexed optical signal and the first branch multiplexing A second optical coupling unit that couples the first multiplexed optical signal to the first optical coupling unit, and a second optical coupling unit that couples the first multiplexed optical signal to the first wavelength multiplexing unit. And a first 1 × 2 optical path selecting means for selecting and outputting to the second optical coupling means, and being disposed between the second wavelength multiplexing means and the second optical coupling means. And a second 1 × 2 optical path selecting means for selecting and outputting the second multiplexed optical signal to the second optical coupling means and the first optical coupling means. Communication node. 19. Each node is further disposed between the counterclockwise optical transmission line and the first wavelength demultiplexing unit, and optically amplifies the input first input optical signal to form the first node. A first pre-optical amplifier for outputting to the first wavelength demultiplexing means, and a second pre-optical amplifier disposed between the clockwise optical transmission line and the second wavelength demultiplexing means for optically amplifying the input second input optical signal. 19. The optical communication node according to claim 18, further comprising: a second pre-optical amplifier that outputs the signal to the second wavelength separation unit. 20. Each of said nodes is further disposed between said first wavelength multiplexing means and said counterclockwise optical transmission line, and optically amplifies said first multiplexed optical signal to produce said signal. A first booster optical amplifier that outputs to the clockwise optical transmission line; and a second booster optical amplifier disposed between the second wavelength multiplexing unit and the clockwise optical transmission line, and optically amplifies the second multiplexed optical signal. 20. The optical communication node according to claim 18, further comprising a second booster optical amplifier that outputs the clock signal to the clockwise optical transmission line. 21. The n insertion and separation means,
Photoelectric conversion means for converting each of the first wavelength-separated light and the second wavelength-separated light into an electric signal; and an overhead terminal for each of the first wavelength-separated light and the second wavelength-separated light. A first receiving interface unit and a second receiving interface unit that perform a demultiplexing operation and time-division multiplexing of input electric data signals to perform overhead signal insertion, and are identical to optical signals input to the receiving interface. 21. The apparatus according to claim 18, further comprising a first transmission interface unit and a second transmission interface unit for generating and outputting an optical signal having the wavelength λi. 4. The optical communication node according to item 1. 22. The n insertion and separation means,
Low-speed transmission and reception for transmitting and receiving at least a part of a data signal input / output via the first transmission interface unit and the first reception interface and the second transmission interface unit and the second reception interface; A signal interface unit, two pairs of electric data signals input from the first reception interface unit and the second reception interface unit, and two pairs output to the first transmission interface unit and the second transmission interface unit Selectively connecting the electrical data signal according to the failure state of the optical transmission line or the node, the first transmission interface unit and the first reception interface and the second transmission interface unit, At least a part of the data signal input / output via the second receiving interface is separated. 22. A cross-connect unit which separates or inserts and inputs / outputs the low-speed interface unit.
The optical communication node as described in the above. 23. The first wavelength separation means and the second wavelength separation means.
23. The optical communication node according to claim 18, wherein each of the wavelength separation means includes an array waveguide diffraction grating. 24. The apparatus according to claim 18, wherein each of the first wavelength multiplexing means and the second wavelength multiplexing means includes an array waveguide diffraction grating.
The optical communication node according to claim 2. 25. The first pre-optical amplifier and the second pre-optical amplifier.
20. The optical communication node according to claim 19, wherein each of the pre-optical amplifiers includes an optical fiber amplifier. 26. The first pre-optical amplifier and the second pre-optical amplifier.
20. The optical communication node according to claim 19, wherein each of the pre-optical amplifiers includes a semiconductor optical amplifier. 27. The apparatus according to claim 20, wherein each of the first booster optical amplifier and the second booster optical amplifier includes an optical fiber amplifier.
27. An optical communication node according to claim 26. 28. The apparatus according to claim 20, wherein each of the first booster optical amplifier and the second booster optical amplifier includes a semiconductor optical amplifier. An optical communication node according to claim 1. 29. The optical communication node according to claim 18, wherein m optical communication nodes are arranged, and the clockwise optical transmission path input terminal and the clock of the adjacent nodes are arranged. The output end of the clockwise optical transmission line, the input end of the counterclockwise optical transmission line, and the output end of the counterclockwise optical transmission line are connected by a clockwise optical transmission line and a counterclockwise optical transmission line, respectively, and are formed in a ring shape. A wavelength-division multiplexing optical transmission device having a ring configuration.