WO2011043122A1 - 光信号送信装置、光信号受信装置、波長多重分離光通信装置および波長パスシステム - Google Patents
光信号送信装置、光信号受信装置、波長多重分離光通信装置および波長パスシステム Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
- H04J14/0204—Broadcast and select arrangements, e.g. with an optical splitter at the input before adding or dropping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
- H04J14/0206—Express channels arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
- H04J14/021—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]
- H04J14/0212—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM] using optical switches or wavelength selective switches [WSS]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0254—Optical medium access
- H04J14/0256—Optical medium access at the optical channel layer
- H04J14/0257—Wavelength assignment algorithms
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0254—Optical medium access
- H04J14/0267—Optical signaling or routing
- H04J14/0269—Optical signaling or routing using tables for routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0287—Protection in WDM systems
- H04J14/0293—Optical channel protection
- H04J14/0295—Shared protection at the optical channel (1:1, n:m)
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0221—Power control, e.g. to keep the total optical power constant
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0278—WDM optical network architectures
- H04J14/0283—WDM ring architectures
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0278—WDM optical network architectures
- H04J14/0284—WDM mesh architectures
Definitions
- the present invention relates to an optical communication network based on wavelength demultiplexing, and more particularly, to an optical signal transmitting apparatus, an optical signal receiving apparatus, a wavelength demultiplexing optical communication apparatus, and a wavelength path system.
- WDM Widelength Division Multiplexing
- ROADM Reconfigurable Optical Add Drop Multiplexer
- Patent Document 1 describes a technology related to high reliability of a wavelength path network.
- FIG. 1 of Patent Document 1 shows a basic configuration of a wavelength path demultiplexing optical transmission device (hereinafter simply referred to as “transmission device”) and an example of switching when a failure occurs.
- FIG. 1B of Patent Document 1 shows a switching operation corresponding to the failure of the optical transmitter 12-1
- FIG. 1C of Patent Document 1 shows a failure of the transmission line 52-1. A switching operation corresponding to is shown.
- the signal selection circuit 11 switches the signal output destination from the optical transmitter 12-1 to the optical transmitter 13-1, so that the optical transmitter 13-1 prepared as a standby system operates as an active system.
- the wavelength multiplexing means 14 wavelength-multiplexes the optical signals from the optical transmitters 12-2 to 12-m and 13-1 to generate a wavelength-multiplexed optical signal, and the wavelength-multiplexed optical signal is transmitted to the transmission line 52-1. To send.
- the wavelength demultiplexing means 21 demultiplexes the wavelength multiplexed optical signal from the transmission line 52-1, into optical signals of each wavelength, and transmits the optical signals of each wavelength to the optical receivers 22-2 to 23-1. To do.
- Each of the optical receivers 22-2 to 23-1 receives an optical signal of each wavelength and outputs a signal corresponding to the optical signal to the signal selection circuit 24.
- the signal selection circuit 24 switches the output destination of the signal so that the signal from the optical receiver 23-1 is substituted for the signal from the optical receiver 22-1.
- the wavelength multiplexing means 14 wavelength-multiplexes the optical signals from the optical transmitters 12-1 to 12-m to generate a wavelength multiplexed optical signal, and outputs the wavelength multiplexed optical signal from the transmission line 52-1. Switch to system transmission line 52-2.
- the wavelength separation means 21 having the same wavelength input / output characteristics as the wavelength multiplexing means 14 separates the wavelength multiplexed optical signal from the transmission line 52-2 into the optical signals of the respective wavelengths and converts the optical signals of the respective wavelengths.
- the signals are sent to the optical receivers 22-1 to 22-m, respectively.
- FIG. 1 of Patent Document 1 shows a case where there are two transmission lines, an active system and a standby system, but it is also possible to use a plurality of operation system transmission lines. Further, as shown in FIG. 9 of Patent Document 1, it is possible to expand the network by an optical add / drop node.
- FIG. 1A is a diagram illustrating a transmission device described in Patent Document 1.
- FIG. 1A is a diagram illustrating a transmission device described in Patent Document 1.
- Signal selection circuits (optical matrix switches) 1501 and 1504 are provided, respectively.
- the transmission side and the reception side are connected via three or more transmission paths (or networks) 1506 to 1509.
- optical signals of wavelengths ⁇ 1 to ⁇ 4 transmitted from the optical transmitter 1505 are input to the input / output ports P1 to P4 of the wavelength multiplexing unit 1502 via the optical matrix switch 1501, respectively.
- the wavelength multiplexing unit 1502 wavelength multiplexes the optical signals of wavelengths ⁇ 1 to ⁇ 4 to generate a wavelength multiplexed optical signal, and outputs the wavelength multiplexed optical signal from the route port # 1. Thereafter, the wavelength multiplexed optical signal is input to the route port # 1 of the wavelength demultiplexing unit 1503 via the transmission line 1506.
- the wavelength demultiplexing unit 1503 separates the wavelength multiplexed optical signal for each wavelength, generates optical signals with wavelengths ⁇ 1 to ⁇ 4, and outputs the optical signals with wavelengths ⁇ 1 to ⁇ 4 from the input / output ports P1 to P4, respectively.
- optical signals of wavelengths ⁇ 1 to ⁇ 4 transmitted from the wavelength separation unit 1503 are received by the optical receiver 1510 via the optical matrix switch 1504.
- the transmission apparatus not only simultaneous switching from the active transmission line to the standby transmission line due to a transmission line failure, or switching operation for failure of the optical transmitter or optical receiver, but also any wavelength in any transmission line. An operation for transmitting an optical signal is required.
- Patent Document 1 has a problem that a combination of wavelength and path that cannot be selected occurs.
- wavelength multiplexing unit 1502 and wavelength separation unit 1503 input / output characteristics of the wavelength multiplexing unit 1502 and wavelength separation unit 1503 and input / output characteristics of the optical matrix switches 1501 and 1504 will be described.
- the wavelength multiplexing unit and the wavelength separation unit have the same configuration.
- FIGS. 2A and 2B are diagrams showing a connection relationship between the input / output ports P1 to P4 and the route ports # 1 to # 4 of the wavelength multiplexing unit and the wavelength separation unit.
- 2C and 2D are diagrams showing the connection relationship between the input / output ports P1 to P8 and the route ports # 1 to # 8 of the wavelength multiplexing unit and the wavelength demultiplexing unit.
- the connection relationship between the input / output ports P1 to P4 and the route ports # 1 to # 4 has wavelength dependency. Therefore, when an optical signal with wavelength ⁇ 1 is input to the input / output port P1, an optical signal with wavelength ⁇ 1 is output from the route port # 1, and when an optical signal with wavelength ⁇ 2 is input to the input / output port P1, the wavelength ⁇ 2 The optical signal is output from the route port # 2.
- FIG. 3A shows the 4 ⁇ 4 optical matrix switch 1501 shown in FIG. 1A. Note that the optical matrix switch 1504 shown in FIG. 1A has the same configuration as the optical matrix switch 1501.
- optical switch elements 1701 having first and second input portions and first and second output portions are arranged in a matrix in the same direction.
- 3B and 3C are diagrams showing the optical switch element 1701.
- the optical switch element 1701 outputs a light signal received at the first input unit from the first output unit and outputs an optical signal received at the second input unit from the second output unit, and a cross-state.
- the bar-state that outputs the optical signal received at the first input unit from the second output unit and the optical signal received at the second input unit from the first output unit is alternatively set. Is possible.
- an arbitrary port in one port group (vertical input / output port group in FIG. 3A) is the other port group (horizontal input / output port group in FIG. 3A). ) Can be connected to any port (non-blocking configuration). Also, in the optical matrix switch 1501, the input optical signals are output without being combined.
- the optical matrix switch 1501 transmits the wavelength to the input / output port P1 of the wavelength multiplexing unit. It is impossible to input an optical signal of ⁇ 2.
- An object of the present invention is to provide an optical signal transmitting apparatus, an optical signal receiving apparatus, a wavelength division multiplexing optical communication apparatus, and a wavelength path system that can solve the above-described problems.
- the optical signal transmitter of the present invention is M (M is an integer of 2 or more) light output means for outputting optical signals having different wavelengths;
- Optical switch means comprising: M input ports connected to the M optical output means in a one-to-one relationship; M output ports; and switching means for switching connection between the input ports and the output ports; , The M reception ports connected to the M output ports on a one-to-one basis, and the connection with the reception port is switched according to the wavelength of the optical signal input to the reception port (N is 2 Wavelength division means for transmitting a multiplexed optical signal corresponding to the optical signal received by the reception port from the transmission port, the number of transmission ports being an integer of M or less)
- the switching means has an aggregate connection for connecting Y (Y is an integer not less than 2 and not more than M) specific input ports of the M input ports to one specific output port of the M output ports. When performing, the Y optical signals input to the Y specific input ports are combined to generate a combined signal, and the combined connection is performed by out
- the optical signal receiver of the present invention is N (N is an integer of 2 or more) receiving ports that accept wavelength-multiplexed optical signals, and M (the connection to the receiving port is switched according to the wavelength of the wavelength-multiplexed optical signal input to the receiving port.
- M is an integer greater than or equal to N) output ports;
- Optical switch means comprising: M input ports connected in a one-to-one relationship with the M output ports; M output ports; and a switching means for switching connection between the input ports and the output ports;
- M wavelength selecting means connected to the M output ports on a one-to-one basis and capable of selecting a transmission wavelength;
- M light receiving means connected to the M wavelength selecting means on a one-to-one basis and receiving the optical signal transmitted through the wavelength selecting means connected to the M wavelength selecting means;
- the switching means has a branch connection for connecting one specific input port of the M input ports to Y (Y is an integer of 2 or more and M or less) specific output ports of the M output ports. When performing, the branch connection is performed by dividing the optical signal input to the specific input port into Y branch signals and outputting the Y branch signals to the Y specific output ports, respectively.
- FIG. 4 shows a transmission side apparatus included in the wavelength path demultiplexing optical transmission apparatus as the first embodiment of the present invention.
- a transmission side device (optical signal transmission device) includes an optical matrix switch circuit 0101a, a wavelength path multiplexing / demultiplexing circuit 0102a, optical output units 0103aX to 0103aW, an optical transmission wavelength control circuit 0104a, and an optical switch branching / combining ratio control.
- a circuit 0106a, an optical transmission device control circuit 0105a, a storage unit 2a, and a storage unit 3a are included.
- the optical transmission wavelength control circuit 0104a, the optical switch branching / multiplexing ratio control circuit 0106a, and the optical transmission device control circuit 0105a are included in the control unit 1a.
- Control unit 1a can be generally referred to as control means.
- Storage unit 2a can generally be referred to as storage means.
- Storage unit 3a can be generally referred to as storage means.
- the optical matrix switch circuit 0101a can be generally referred to as optical switch means.
- the light output units 0103aX to 0103aW can be generally called light output means.
- the wavelength path multiplexing / separating circuit 0102a can be called wavelength multiplexing means.
- FIG. 5A is a diagram showing a configuration of the optical matrix switch circuit 0101a.
- M is not limited to 4, and may be an integer of 2 or more.
- the switching unit 6 can be generally referred to as switching means.
- the switching unit 6 connects Y (Y is an integer not less than 2 and not more than M) specific input ports among the M input ports 4a to 4d to one specific output port among the M output ports 5a to 5d.
- Y is an integer not less than 2 and not more than M
- the Y optical signals input to the Y specific input ports are combined to generate a combined signal, and the combined signal is output to the specific output port.
- the switching unit 6 multiplexes the Y optical signals so that the powers of the Y optical signals included in the combined signal are equal to each other.
- the switching unit 6 is composed of a plurality of optical switch elements 0301a connected in a grid.
- the optical switch element 0301a includes a port a (second input unit), a port b (first input unit), a port c (second output unit), and a port d (first input unit). Output section).
- the optical switch elements 0301a are arranged in a matrix in M rows and M columns in the same direction.
- the port b of the optical switch element 0301a in the Mth row (Dth row in FIG. 5A) is connected to the input port 4, and the port c of the optical switch element 0301a in the Mth column is the output port 5 Are connected to each other.
- the optical switch element 0301a combines the optical input signal from the port b with the optical input signal from the port a by appropriately adjusting the branching / combining ratio of the optical switch element 0301a. Is possible.
- the optical switch element 0301a can alternatively set a cross state, a bar state, and a combined state.
- the cross state is a state (Cross-state) in which the optical signal received at port b is output from port d and the optical signal received at port a is output from port c.
- the bar state is a state (Bar-state) in which an optical signal received at port b is output from port c and an optical signal received at port a is output from port d.
- the combined state is a state in which the optical signal received at port b and the optical signal received at port a are combined and output from port c.
- the optical switch element 0301a When performing the aggregate connection, the optical switch element 0301a generates a combined signal and outputs the combined signal from the specific output port in any of the cross state, the bar state, and the combined state. It becomes a state.
- M optical output units 0103aX to 0103aW are transponders or optical transmitters.
- the optical output units 0103aX to 0103aW can output an optical signal having an arbitrary WDM signal wavelength by the wavelength variable function.
- the optical output units 0103aX to 0103aW are connected to the input ports 4a to 4d of the optical matrix switch circuit 0101a on a one-to-one basis, and output optical signals having different wavelengths.
- the wavelength path multiplexing / demultiplexing circuit 0102a includes M wavelength demultiplexing ports (also referred to as “accepting ports”) P1 to P4 connected one-to-one with the output ports 5a to 5d of the optical matrix switch circuit 0101a, and ports P1 to P4.
- N is not limited to 4, and may be an integer from 2 to M.
- the storage unit 2a includes first-a connection information indicating connection relationships depending on wavelengths between the transmission ports # 1 to # 4 and the reception ports P1 to P4, and the reception ports P1 to P4 and the output ports 5a to 5d of the optical matrix switch circuit 0101a. And 2a connection information representing the connection relationship between the input ports 4a to 4d of the optical matrix switch circuit 0101a and the optical output units 0103aX to 0103aW.
- the 1a connection information, the 2a connection information, and the 3a connection information are included in the transmission side connection information (connection information).
- the optical output unit is specified as a transmission side communication unit (communication means) that outputs optical signals of Y types of communication wavelengths.
- the control unit 1a refers to the transmission side connection information in the storage unit 2a, and for each transmission side communication unit, of the M input ports 4a to 4d, the specific input connected to the transmission side communication unit.
- a port, a specific reception port connected to a communication port among the M reception ports P1 to P4, a specific output port connected to a specific reception port among the M output ports 5a to 5d, and a specific input port The specific optical path in the switching unit 6 to which the output port is connected is specified.
- the control unit 1a controls the switching unit 6 so that each of the specific optical paths is formed.
- control unit 1a when the control unit 1a specifies the transmission side communication unit, for each transmission side communication unit, the control unit 1a determines the specific optical path in the optical matrix switch circuit 0101a that is a part of the optical path from the transmission side communication unit to the communication port.
- the optical switch element 0301a is set to one of a cross state, a bar state, and a combined state so as to be specified by referring to the transmission side connection information in the storage unit 2a and to form each of the specific optical paths.
- control part 1a sets the specific optical switch element which exists in the location where specific optical paths merge among optical switch elements 0301a to a multiplexing state.
- Each optical switch element 0301a can multiplex an optical signal received at port b and an optical signal received at port a at an arbitrary ratio in a multiplexed state.
- the control unit 1a sets the specific optical switch element to the multiplexed state and sets the multiplexing ratio of the optical signals so that the powers of the optical signals after joining are equal.
- the control unit 1a also includes information indicating a communication port, a communication wavelength, a transmission side communication unit, a specific optical path in the switching unit 6, a specific input port, a specific output port, and a specific reception port. Is stored in the storage unit 3a.
- the optical transmission device control circuit 0105a When the optical transmission device control circuit 0105a receives the setting request indicating the route and wavelength (specific wavelength) by the higher-level setting means (not shown), the first-a connection information, the second-a connection information, and the third-a connection in the storage unit 2a With reference to the information, the optical transmission wavelength control circuit 0104a and the optical switch branching / combining ratio control circuit 0106a are controlled.
- the optical transmission wavelength control circuit 0104a sets the wavelength of the optical signal output from the optical output unit 0103a specified in the request to the transmission wavelength specified in the request. Set to (specific wavelength).
- the optical switch branching / combining ratio control circuit 0106a sets the branching / combining ratio of the optical switch element 0301a designated by the request.
- FIG. 6 shows a receiving side apparatus of the wavelength path demultiplexing optical transmission apparatus as the first embodiment of the present invention.
- the receiving side device includes an optical matrix switch circuit 0101b, a wavelength path multiplexing / demultiplexing circuit 0102b, optical receiving units 0103bX to 0103bW, an optical switch branching / combining ratio control circuit 0106b, and an optical transmission device control.
- the circuit includes a circuit 0105b, wavelength tunable filters 0108bX to 0108bW, a wavelength tunable filter control circuit 0107b, a storage unit 2b, and a storage unit 3b.
- the optical switch branching and multiplexing ratio control circuit 0106b, the optical transmission device control circuit 0105b, and the wavelength tunable filter control circuit 0107b are included in the control unit 1b.
- Control unit 1b can generally be referred to as control means.
- Storage unit 2b can be generally referred to as storage means.
- Storage unit 3b can be generally referred to as storage means.
- the optical matrix switch circuit 0101b can be generally referred to as optical switch means.
- the wavelength path multiplexing / separating circuit 0102b can be generally called wavelength separating means.
- the wavelength tunable filters 0108bX to 0108bW can be generally called wavelength selection means.
- the light receiving units 0103bX to 0103bW can be generally called light receiving means.
- the wavelength path multiplexing / demultiplexing circuit 0102b is connected to N wavelength multiplexed ports (hereinafter also referred to as “accepting ports”) # 1 to # 4 for receiving wavelength multiplexed optical signals and to ports # 1 to # 4.
- N wavelength multiplexed ports hereinafter also referred to as “accepting ports”
- M wavelength separation ports hereinafter also referred to as “transmission ports”
- P1 to P4 that are switched according to the wavelength of the wavelength multiplexed optical signal input to .about.4.
- FIG. 7A is a diagram showing a configuration of the optical matrix switch circuit 0101b. 7A shows a configuration when the optical matrix switch circuit 0101b shown in FIG. 6 is viewed from the back side.
- the optical matrix switch circuit 0101b includes M input ports 7a to 7d connected to the M transmission ports P1 to P4 of the wavelength path multiplexing / demultiplexing circuit 0102b on a one-to-one basis, and M output ports 8a to 8d. And a switching unit 9 for arbitrarily switching the connection between the input ports 7a to 7d and the output ports 8a to 8d.
- the switching unit 9 can be generally referred to as switching means.
- the switching unit 9 When performing branch connection in which one specific input port among the M input ports 7a to 7d is connected to one specific output port among the M output ports 8a to 8d, the switching unit 9 is connected to the specific input port.
- the input optical signal is divided into Y branch signals, and the Y branch signals are respectively output to Y specific output ports to perform branch connection.
- the switching unit 9 divides the optical signal input to the specific input port into the Y branch signals so that the powers of the Y branch signals are equal to each other.
- the switching unit 9 is composed of a plurality of optical switch elements 0301b connected in a grid.
- the optical switch element 0301b includes a port a (first output unit), a port b (second output unit), a port c (first input unit), and a port d (second output unit). Input section).
- the optical switch elements 0301b are arranged in a matrix in M rows and M columns in the same direction.
- the first input portion of the optical switch element 0301b in the Mth column is connected to the input port 7, and the second output portion of the optical switch element 0301b in the Mth row (Dth row in FIG. 7A) It is connected to the output port 8.
- the optical switch element 0301b can branch the optical input signal from the port c to the port a and the port b by appropriately adjusting the branching / combining ratio of the optical switch element 0301b. is there.
- the optical switch element 0301a can alternatively set a cross state, a bar state, and a branch state.
- the branch state is a state in which the optical signal received at port c is divided into two and output from port b and port a, respectively.
- the optical signal input to the specific input port is divided into Y branch signals, and the Y branch signals are output to the Y specific output ports, respectively.
- the state is one of a cross state, a bar state, and a branch state.
- M wavelength variable filters 0108bX to 0108bW are connected to the M output ports 8a to 8d of the optical matrix switch circuit 0101b on a one-to-one basis, and the transmission wavelength can be selected.
- the light reception units 0103bX to 0103bW are, for example, optical receivers or transponders.
- the M light receiving units 0103bX to 0103bW are connected to the wavelength tunable filters 0108bX to 0108bW on a one-to-one basis, and among the wavelength tunable filters 0108bX to 0108bW, optical signals having wavelengths transmitted through the wavelength tunable filter 0108b connected to itself. Receive.
- the storage unit 2b includes 1b connection information representing connection relationships depending on wavelengths between the transmission ports P1 to P4 of the wavelength path multiplexing / demultiplexing circuit 0102b and the receiving ports # 1 to # 4 of the wavelength path multiplexing / demultiplexing circuit 0102b; 2b connection information representing the connection relationship between the transmission ports P1 to P4 of the wavelength path multiplexing / demultiplexing circuit 0102b and the input ports 7a to 7d of the optical matrix switch circuit 0101b, and the output ports 8a to 8d of the optical matrix switch circuit 0101b and the light
- the 3b connection information representing the connection relationship with the receiving units 0103bX to 0103bW is stored.
- the 1b connection information, the 2b connection information, and the 3b connection information are included in the reception side connection information (connection information).
- the control unit 1b When receiving the setting request indicating the communication port that is one of the reception ports # 1 to # 4 and the Y types of communication wavelengths, the control unit 1b receives Y of the M light reception units 0103bX to 0103bW.
- the light receiving unit is specified as a receiving side communication unit (communication means) that receives optical signals of Y types of communication wavelengths.
- the control unit 1b refers to the receiving side connection information in the storage unit 1b, and for each receiving side communication unit, of the M output ports 8a to 8d, the receiving side communication unit A specific output port connected to the communication port, a specific output port connected to the communication port among the M output ports P1 to P4 of the wavelength path multiplexing / demultiplexing circuit 0102b, and a specific output port among the M input ports 7a to 7d And a specific optical path in the switching unit 9 for connecting the specific input port and the specific output port, and among the M wavelength variable filters 0108bX to 0108bW, connected to the receiving communication unit
- the transmission wavelength of the wavelength tunable filter 0108b (specific wavelength selection means) to be set is set to the communication wavelength accepted by the receiving side communication unit among the Y types of communication wavelengths, and that of the specific optical path Les controls the switching unit 9 so as to form.
- the control unit 1b specifies the reception side communication unit
- the specific optical path in the optical matrix switch circuit 0101b that becomes a part of the optical path from the communication port to the reception communication unit is determined.
- the optical switch element 0301b is set to one of the cross state, the bar state, and the branch state so as to be identified with reference to the receiving side connection information in the storage unit 2a and to form each of the specific optical paths.
- control part 1b sets the specific optical switch element which exists in the location where a specific optical path branches among the optical switch elements 0301b to a branch state.
- Each of the optical switch elements 0301b can branch the optical signal received at the port c at an arbitrary ratio when performing branch connection.
- the control unit 1b sets the specific optical switch element to the branching state and sets the branching ratio so that the powers of the branched optical signals of the respective wavelengths become equal.
- control unit 1b includes information indicating a communication port, a communication wavelength, a reception-side communication unit, a specific optical path in the switching unit 9, a specific input port, a specific output port, and a specific reception port. Are stored in the storage unit 3b.
- the optical transmission device control circuit 0105b When the optical transmission device control circuit 0105b receives the setting request indicating the route and wavelength (specific wavelength) by the higher setting means (not shown), the 1b connection information, the 2b connection information, and the 3b in the storage unit 2b are received. With reference to the connection information, the wavelength tunable filter control circuit 0107b and the optical switch branching / combining ratio control circuit 0106b are controlled.
- the optical switch branching / combining ratio control circuit 0106b sets the branching / combining ratio of the optical switch element 0301b in the optical matrix switch circuit 0101b specified by the request. .
- the wavelength tunable filter control circuit 0107b sets the transmission center wavelength of the wavelength tunable filter 0108bX to a wavelength received by the light receiving unit 0103bX in response to a request from the optical transmission device control circuit 0105b, and the wavelength tunable filter 0108bY. Is set to the wavelength received by the light receiving unit 0103bY, the transmission center wavelength of the wavelength tunable filter 0108bZ is set to the wavelength received by the light receiving unit 0103bZ, and the wavelength tunable filter 0108bW is set. Is set to the wavelength received by the light receiving unit 0103bW.
- FIG. 8 is a diagram showing a wavelength division multiplexing optical communication system in which the transmission side device shown in FIG. 4 and the reception side device shown in FIG. 6 are connected via transmission lines 1506 to 1509.
- the optical transmission device control circuit 0105a Upon receiving the wavelength path signal setting request for wavelength ⁇ 1 ⁇ path # 1, the optical transmission device control circuit 0105a specifies the optical output unit 0103aY and sets the wavelength of the optical signal transmitted from the optical output unit 0103aY to ⁇ 1. The optical transmission wavelength control circuit 0104a is notified of the setting.
- the optical transmission device control circuit 0105a connects the connection relationship between the wavelength separation ports P1-P4 and the route ports # 1- # 4 of the wavelength path multiplexing / demultiplexing circuit 0102a (first-a connection) stored in the storage unit 2a.
- Information; see FIG. 2B) for setting the wavelength path of ⁇ 1-path # 1, the optical signal transmitted from the optical output unit 0103aY is input to the wavelength separation port P1 of the wavelength path multiplexing / demultiplexing unit 0102a
- the optical matrix switch circuit 0101a needs to be set.
- the optical transmission device control circuit 0105a refers to the 2a connection information and the 3a connection information stored in the storage unit 2a, and for the optical switch elements D2, C2, B2, A3, and A4, branch multiplexing Setting (combining state setting) is not performed, but a normal OFF (cross) state is set, and a wavelength signal (optical signal) of wavelength ⁇ 1 input from the optical switch element B2 is applied to the optical switch element A2.
- the optical switch branching / combining ratio control circuit 0106a is notified that the state (bar state) to be output to the optical switch element A3 is set.
- the optical switch branching / combining ratio control circuit 0106a sets the optical switch elements D2, C2, B2, A3 and A4 to the cross state and sets the optical switch element A2 to the bar state in accordance with the notification from the optical transmission device control circuit 0105a. Set.
- the optical transmission wavelength control circuit 0104a sets the wavelength of the optical signal transmitted from the optical output unit 0103aY to ⁇ 1 in accordance with the notification from the optical transmission device control circuit 0105a.
- the wavelength optical signal having the wavelength ⁇ 1 transmitted from the optical output unit 0103aY is output to the route # 1.
- the optical transmission device control circuit 0105a When the optical transmission device control circuit 0105a receives the wavelength path signal setting request for wavelength ⁇ 3-path # 3 following the wavelength path signal setting request for wavelength ⁇ 1-path # 1, that is, wavelength ⁇ 1-path #, the optical output unit 0103aX is designated and the wavelength of the optical signal transmitted from the optical output unit 0103aX is set to ⁇ 3. This is notified to the optical transmission wavelength control circuit 0104a.
- the optical transmission device control circuit 0105a connects the connection relationship between the wavelength separation ports P1-P4 and the route ports # 1- # 4 of the wavelength path multiplexing / demultiplexing circuit 0102a (first-a connection) stored in the storage unit 2a.
- Information; see FIG. 2B) for the wavelength path setting of ⁇ 3-path # 3, the optical signal transmitted from the optical output unit 0103aX is input to the wavelength separation port P1 of the wavelength path multiplexing / demultiplexing unit 0102a
- the optical matrix switch circuit 0101a needs to be set.
- the optical transmission device control circuit 0105a refers to the 2a connection information and the 3a connection information stored in the storage unit 2a, and for the optical switch elements D1, C1, B1, A3, and A4, branch multiplexing Setting (combining state setting) is not performed, but a normal OFF (cross) state is set, and for the optical switch element A1, the wavelength signal of wavelength ⁇ 1 input from the optical switch element B1 is transmitted to the optical switch element A2.
- the optical switch branching / combining ratio control circuit 0106a is notified of the fact that it is set to the state (bar state) to be output to the optical switch.
- the optical transmission device control circuit 0105a includes the optical switch element A2 so that the optical switch element A2 aggregates (combines) the wavelength signals from the two input ports into one output port as shown in FIG. 9A.
- the optical switch branching / combining ratio control circuit 0106a is notified to set the multiplexing state with the branching ratio set to 1/2.
- the optical switch branching / combining ratio control circuit 0106a sets the optical switch elements D1, C1, B1, A3 and A4 to the cross state and sets the optical switch element A1 to the bar state in accordance with the notification from the optical transmission device control circuit 0105a. Then, the optical switching device A2 is set to a combined state in which the branching ratio of the optical switching device A2 is 1 ⁇ 2.
- the optical switch element A2 When the branching ratio is set to 1/2, the optical switch element A2 outputs the input signal ( ⁇ 3) from the optical switch element A1 to the optical switch element A3 with a transmission loss of 3 dB, and at the same time inputs from the optical switch element B2 The signal ( ⁇ 1) is output to the optical switch element A3 with a transmission loss of 3 dB. Therefore, assuming that the input optical power to the optical switch element A2 is X for the wavelength signals ⁇ 1 and ⁇ 3, the power of the output optical signal from the optical switch element A2 to the optical switch element A3 is X.
- the optical transmission wavelength control circuit 0104a sets the wavelength of the optical signal transmitted from the optical output unit 0103aX to ⁇ 3 in accordance with the notification from the optical transmission device control circuit 0105a.
- the optical signal having the wavelength ⁇ 3 can be input to the wavelength separation port P1 of the wavelength path multiplexing / demultiplexing unit 0102a to which the optical signal having the wavelength ⁇ 1 has already been input. For this reason, the optical signal of wavelength ⁇ 3 transmitted from the optical output unit 0103aX is output to the route # 3.
- the optical transmission device control circuit 0105a When the optical transmission device control circuit 0105a receives the wavelength path signal setting request for the wavelength ⁇ 2-path # 2 following the wavelength path signal setting request for the wavelength ⁇ 1-path # 1 and the wavelength ⁇ 3-path # 3, That is, upon receiving a wavelength path signal setting request for wavelength ⁇ 1-path # 1, wavelength ⁇ 3-path # 3, and wavelength ⁇ 2-path # 2, the optical output unit 0103aW is designated and the optical output unit The optical transmission wavelength control circuit 0104a is notified that the wavelength of the optical signal transmitted from 0103aW is set to ⁇ 2.
- the optical transmission device control circuit 0105a connects the connection relationship between the wavelength separation ports P1-P4 and the route ports # 1- # 4 of the wavelength path multiplexing / demultiplexing circuit 0102a (first-a connection) stored in the storage unit 2a.
- Information; see FIG. 2B) for setting the wavelength path of ⁇ 2-path # 2, the optical signal transmitted from the optical output unit 0103aW is input to the wavelength separation port P1 of the wavelength path multiplexing / demultiplexing unit 0102a
- the optical matrix switch circuit 0101a needs to be set.
- the optical transmission device control circuit 0105a refers to the 2a connection information and the 3a connection information stored in the storage unit 2a, and for the optical switch elements D4, C4, and B4, the branch multiplexing setting (multiplexing)
- the optical switch element A2 is set to the normal OFF (cross) state, and the optical switch element A2 is maintained in the setting state when the wavelength path of ⁇ 3-path # 3 is set.
- the optical switch branching / combining ratio control circuit 0106a is notified to set the multiplexing state (see FIG. 9A) with the branching ratio being 1/3.
- the optical switch branching / combining ratio control circuit 0106a sets the optical switch elements D4, C4, and B4 to the cross state according to the notification from the optical transmission apparatus control circuit 0105a, and for the optical switch element A2, the ⁇ 3-path # 3
- the setting state of the optical switch element at the time of setting the wavelength path is maintained, and the branching ratio of the optical switch element A4 is set to 1/3.
- the optical switch element A4 When 1/3 is set as the branching ratio, the optical switch element A4 outputs the input signals ( ⁇ 1, ⁇ 3) from the optical switch element A3 to the wavelength separation port P1 with a transmission loss of 1.8 dB.
- the optical transmission wavelength control circuit 0104a sets the wavelength of the optical signal transmitted from the optical output unit 0103aW to ⁇ 2 in accordance with the notification from the optical transmission device control circuit 0105a.
- the optical signal having the wavelength ⁇ 2 can be input to the wavelength separation port P1 of the wavelength path multiplexing / demultiplexing unit 0102a to which the optical signals having the wavelengths ⁇ 1 and ⁇ 3 have already been input. For this reason, the optical signal of wavelength ⁇ 2 transmitted from the optical output unit 0103aW is output to the route # 2.
- the above operations are other than the operation of wavelength setting for the optical output unit 0103a and the operation performed by the wavelength tunable filter control circuit 0107b for setting the transmission wavelength corresponding to the wavelength path signal for the wavelength tunable filters 0108bX to 0108W.
- the optical signal multiplexing operation in the optical switch element becomes the optical signal branching operation (see FIG. 9B).
- the switching unit 6 generates a combined signal by combining the Y optical signals input to the Y specific input ports in the aggregated state, and outputs the combined signal as the specific output. Output to port.
- the switching unit 6 multiplexes the Y optical signals so that the powers of the Y optical signals included in the combined signal are equal to each other. For this reason, it becomes possible to prevent deterioration of the wavelength multiplexed optical signal.
- control unit 1a refers to the storage unit 2a to control the switching unit 6, thereby forming each of the specific optical paths in the switching unit 6. For this reason, each of the specific optical paths can be formed with high accuracy.
- the storage unit 3a is information indicating a communication port, a communication wavelength, a receiving-side communication unit, a specific optical path in the switching unit 6, a specific input port, a specific output port, and a specific reception port. Is stored. For this reason, it becomes possible to manage the information regarding the set wavelength path.
- the switching unit 6 is an optical matrix switch circuit 0101a in which optical switch elements 0301a are arranged in a matrix, and the optical switch element 0301a generates a combined signal in an aggregated state, and the combined signal is output as a specific output. As output from the port, it is in one of a cross state, a bar state, and a combined state. Therefore, it is possible to transmit optical signals having different wavelengths to one wavelength separation port (accepting port) of the wavelength path multiplexing / demultiplexing circuit 0102a using the optical matrix switch circuit 0101a.
- the switching unit 9 divides the optical signal input to the specific input port into Y branch signals, and outputs the Y branch signals to the Y specific output ports, respectively. Therefore, it becomes possible to appropriately receive the wavelength multiplexed optical signal transmitted from the transmission side apparatus shown in FIG.
- the switching unit 9 divides the optical signal input to the specific input port into the Y branch signals so that the powers of the Y branch signals are equal to each other. For this reason, it becomes possible to prevent the variation of the wavelength multiplexed optical signal.
- control unit 1b refers to the storage unit 2b to control the switching unit 9 and the wavelength tunable filters 0108bX to 0108bW, thereby forming each of the specific optical paths in the switching unit 9 and specifying the specific light path to the light receiving unit 0103b.
- An optical signal having a specific wavelength passing through the optical path is received. For this reason, it becomes possible to receive appropriately the optical signal for every wavelength contained in the wavelength division multiplexing optical signal transmitted from the transmission side apparatus shown in FIG.
- the storage unit 3b includes information indicating a communication port, a communication wavelength, a receiving-side communication unit, a specific optical path in the switching unit 9, a specific input port, a specific output port, and a specific reception port. Is stored. For this reason, it becomes possible to manage the information regarding the set wavelength path.
- the switching unit 9 is an optical matrix switch circuit 0101b in which optical switch elements 0301b are arranged in a matrix, and the optical switch element 0301b has Y branches when the optical signal input to the specific input port is branched.
- the signals are divided into signals, and a cross state, a bar state, or a branch state is set so that Y branch signals are respectively output to Y specific output ports. For this reason, it becomes possible to appropriately receive the wavelength multiplexed optical signal transmitted from the transmission side apparatus shown in FIG. 4 using the optical matrix switch circuit 0101b.
- a Mach-Zehnder interferometer-type TO (Thermal Optical) switch such as a silica-based waveguide is applied as the optical switch element in the optical matrix switch circuit 0101a shown in FIG. 4 and the optical matrix switch circuit 0101b shown in FIG. To do.
- the Mach-Zehnder interferometer-type TO (Thermal Optical) switch is a single device or device.
- FIG. 10 shows the transmission loss characteristics with respect to the heater applied power of the Mach-Zehnder interferometer type optical switch.
- the Mach-Zehnder interferometer type optical switch is driven at a point indicated by a black circle in the graph of FIG. 10 in the ON / OFF (Bar / Cross) operation.
- the applied heater power is adjusted according to the multiplexing / branching ratio using the transmission loss characteristics between them.
- the white circles in the graph of FIG. 10 are points at which equal transmission loss characteristics are obtained for the two output ports of the Mach-Zehnder interferometer type optical switch, each having a transmission loss of 3 dB.
- FIG. 11A and FIG. 11B are diagrams showing a Mach-Zehnder interferometer type optical switch of a silica-based waveguide that is formed into an 8 ⁇ 8 array and can be connected without blocking between an input 8 port and an output 8 port.
- a wavelength path multiplexing / separating circuit 0102 is connected to the right side of the optical matrix switch circuit 0101.
- FIGS. 11A and 11B show an 8 ⁇ 8 optical matrix switch, this embodiment is not limited to this switch scale.
- the operation shown in FIG. 11A corresponds to the operation of multiplexing the optical signal to a single port on the transmission side described with reference to FIG.
- the optical switch elements A7, E8, and H7 are set to the complete ON (bar) state, and the optical switch element F5 has the optical signal having the wavelength ⁇ 1 from the input port 1 and the wavelength ⁇ 3 from the port 7.
- the optical switch branching / combining ratio control circuit 0106b controls the power applied to each heater so that the optical signals are combined and the peak levels of the combined optical signals match.
- the optical switch element G6 combines the wavelength path signals ( ⁇ 1, ⁇ 3) input from the optical switch element F5 and the wavelength path signal ( ⁇ 2) input from the optical switch element F7, and all the combined signals
- the optical switch branching / combining ratio control circuit 0106b controls the power applied to each heater so that the peak levels of the optical signals coincide with each other.
- the optical signals (wavelength path signals) of wavelengths ⁇ 1, ⁇ 2, and ⁇ 3 are combined and input to the wavelength separation port of the wavelength path multiplexing / demultiplexing circuit 0102a.
- the operation shown in FIG. 11B corresponds to the operation of branching an optical signal to a plurality of ports on the receiving side described with reference to FIG.
- the optical switch elements A7, E8 and H7 are set to the complete ON (Bar) state, and the optical switch element G6 branches and branches the wavelength path signals ( ⁇ 1, ⁇ 2, ⁇ 3) from the optical switch element H7.
- the optical switch branching / combining ratio control circuit 0106b controls the power applied to each heater so that the peak levels of the optical signals that have been made coincide.
- the optical switch element F5 branches the wavelength path signals ( ⁇ 1, ⁇ 2, ⁇ 3) input from the optical switch element G6, and the optical switch branches so that the peak levels of all the branched optical signals match.
- the multiplexing ratio control circuit 0106b controls the power applied to each heater.
- the wavelength path signal obtained by combining the wavelength path signals of the wavelengths ⁇ 1, ⁇ 2, and ⁇ 3 passes through the wavelength variable filter 0108b in which the transmission center wavelength is set to the wavelength of the wavelength path to be received. Received at.
- FIGS. 12A and 12B show the method of selecting a path port of wavelength path multiplexing / demultiplexing circuits 0102a and 0102b (hereinafter simply referred to as “wavelength path multiplexing / demultiplexing circuit 0102”) and the wavelength of the wavelength path multiplexed in the wavelength demultiplexing port. It is a figure for demonstrating the relationship.
- route ports # 1, 2, 3, and 4 are assigned to routes A, B, C, and D, respectively.
- an optical signal of wavelength ⁇ 1 from route A An optical signal of wavelength ⁇ 2 from the path B, an optical signal of wavelength ⁇ 3 from the path C, and an optical signal of wavelength ⁇ 4 from the path D are simultaneously transmitted to the path port # 1 of the wavelength path multiplexing / separating circuit 0102,
- the optical signals (wavelength path signals) of wavelengths ⁇ 1, ⁇ 2, ⁇ 3, and ⁇ 4 are all output to wavelength separation port P1 (see FIG. 2B). .
- the center transmission wavelength of the wavelength tunable filter 0108b is adjusted to the wavelength of the wavelength path signal to be selected.
- route ports # 1, 3, 5, and 7 are assigned to routes A, B, C, and D, respectively.
- an optical signal of wavelength ⁇ 1 from route A An optical signal of wavelength ⁇ 3 from the path B, an optical signal of wavelength ⁇ 5 from the path C, and an optical signal of wavelength ⁇ 7 from the path D are simultaneously transmitted to the path port # 1 of the wavelength path multiplexing / demultiplexing circuit 0102,
- the optical signals (wavelength path signals) of wavelengths ⁇ 1, ⁇ 3, ⁇ 5, and ⁇ 7 are all output to wavelength separation port P1 (see FIG. 2B). .
- the center transmission wavelength of the wavelength variable filter 0108b is adjusted to the wavelength of the wavelength path signal to be selected.
- the wavelength intervals of the wavelength path signals multiplexed and output to the wavelength separation port are widened, and the wavelength tunable filter 0108b. Therefore, the filter characteristics required for the filter can be made gentle and the cost can be reduced.
- FIG. 13 shows a MEMS (Micro Electro Mechanical System) optical matrix switch (output switching means) 0405a, a 2: 1 multiplexing / branching optical coupler (generation means) 0401a, and an optical matrix switch circuit 0101a shown in FIG. It is the figure which showed the transmission side apparatus using 1 multiplexing / branching optical coupler (generation means) 0402a and 4: 1 multiplexing / branching optical coupler (generation means) 0403a.
- MEMS Micro Electro Mechanical System
- FIG. 14 shows a MEMS optical matrix switch (output switching means) 0405b, a 2: 1 multiplexing / branching optical coupler (branching means) 0401b, and a 3: 1 multiplexing / branching optical coupler as the optical matrix switch circuit 0101b shown in FIG. It is the figure which showed the receiving side apparatus using (branch means) 0402b and 4: 1 multiplexing / branching optical coupler (branch means) 0403b.
- the optical matrix switch circuit is not limited to the MEMS optical matrix switch as long as the optical matrix switch can connect the input / output ports without blocking.
- the optical switch elements shown in FIG. 3A are arranged in a matrix in the same direction.
- N The maximum value of N of the multiplexing / branching optical coupler matches the number of corresponding routes.
- a 4: 1 multiplexing / branching coupler may be provided.
- the wavelength path signals of wavelengths ⁇ 1 and ⁇ 2 transmitted from the optical output unit 0103 are set to the route ports # 1 and # 2 of the wavelength path multiplexing / demultiplexing circuit 0102, respectively. The operation will be described.
- the optical transmission device control circuit 0105a Upon receiving the wavelength path transmission setting request ( ⁇ 1-path # 1, ⁇ 2-path # 2), the optical transmission device control circuit 0105a refers to the storage unit 2a and separates the wavelength paths of the wavelengths ⁇ 1 and ⁇ 2. It is determined that it is necessary to input to port P1.
- the optical transmission device control circuit 0105a uses the 2: 1 multiplexing / branching optical coupler 0401a to multiplex the wavelength path signals in the storage unit. With reference to 2a, the optical switch branching / combining ratio control circuit 0106a is controlled.
- the optical transmission device control circuit 0105a also inputs the combined wavelength path signal ( ⁇ 1, ⁇ 2) to the wavelength separation port P1 of the wavelength path demultiplexing / multiplexing circuit 0102, so that the optical switch branching / combining ratio control circuit 0106a To control.
- the wavelength path of the wavelengths ⁇ 1 and ⁇ 2 is wavelength-separated with reference to the storage unit 2b. It is determined that the data is output from the port P1.
- the optical transmission device control circuit 0105b uses the 2: 1 multiplexing / branching optical coupler 0401b to branch the wavelength path signal in order to store the storage unit 2a.
- the optical switch branching / combining ratio control circuit 0106b is controlled.
- the optical transmission device control circuit 0105b outputs the branched wavelength path signals ( ⁇ 1, ⁇ 2) to the port to which the light receiving unit 0103bX is connected among the ports of the wavelength path demultiplexing / multiplexing circuit 0102b.
- the optical switch branching / combining ratio control circuit 0106b is controlled with reference to the storage unit 2a.
- the same setting is performed for the light receiving unit 0103bY, and the transmission center wavelength of the wavelength tunable filter 0108bY is set to the wavelength ⁇ 1.
- FIGS. 15 and 16 are diagrams showing a WDM wavelength path system in which a plurality of nodes including a wavelength path demultiplexing optical transmission device including any of the transmission side device and the reception side device of the above embodiment are arranged.
- the WDM wavelength path system includes a wavelength network node 0901 having a wavelength cross-connect-WXC (Wavelength Cross-Connect) function, a transponder (light output means and light reception means) 1406, an optical fiber 0903, a transmission path 0902, and a wavelength.
- the wavelength network node 0901, the transponder 1406, and the wavelength network management controller 0910 are included in each node in the WDM wavelength path system.
- Each node multiplexes or separates wavelength paths for a plurality of wavelength path multiplex transmission lines.
- the wavelength path is configured at least between an optical output unit (for example, a transponder) included in one of arbitrary two nodes and an optical reception unit (for example, a transponder) included in the other.
- the WDM wavelength path system can construct an arbitrary network topology such as a ring topology shown in FIG. 15 and a mesh topology shown in FIG.
- FIG. 17 is a diagram illustrating a node 0901 including a wavelength path demultiplexing optical transmission device including any of the transmission side device and the reception side device of the above embodiment.
- the node 0901 includes a WDM line unit 1423, a transponder accommodation function unit 1422, a transponder 1421, and an optical transmission device control circuit 1432.
- the transponder accommodating function unit 1422 includes wavelength path multiplexing / demultiplexing units 1404 and 1405.
- the wavelength path multiplexing / demultiplexing unit 1404 is the receiving-side wavelength path multiplexing / demultiplexing unit 0102b shown in FIG.
- the wavelength path multiplexing / demultiplexing unit 1405 is the wavelength path multiplexing / demultiplexing unit 0102a on the transmission side illustrated in FIG.
- the optical matrix switch circuit 1326 is the optical matrix switch circuit 0101b on the receiving side shown in FIG.
- the optical matrix switch circuit 1327 is the optical matrix switch circuit 0101a on the transmission side shown in FIG.
- the WDM line unit 1423 includes a plurality of optical branching couplers 1403 and a plurality of wavelength selection circuits 1402.
- Optical branching coupler 1403 can be generally referred to as optical power branching means.
- Wavelength selection circuit 1402 can be generally referred to as wavelength selective switch means.
- the WDM line unit 1423 generates a WDM line signal by wavelength multiplexing the wavelength optical signal transmitted from the transponder 1421 provided in the node, or wavelength-demultiplexes the WDM line signal and receives the wavelength optical signal received by the transponder 1421. Or generate.
- the WDM line unit 1423 has a function of outputting a wavelength optical signal that enters and passes through this node to an appropriate route.
- the optical branching coupler 1403 is connected to a plurality of wavelength path multiplex transmission lines on a one-to-one basis.
- the wavelength selection circuit 1402 is connected to a plurality of wavelength path multiplex transmission lines on a one-to-one basis.
- the optical branching coupler 1403 divides the wavelength multiplexed optical signal input from the wavelength path multiplexed transmission line connected to itself into the own node into two, and one wavelength multiplexed optical signal is out of the plurality of wavelength selection circuits 1402. Outputs to the wavelength selection circuit 1402 connected to the wavelength path multiplex transmission line other than the wavelength path multiplex transmission line, and outputs the other wavelength multiplexed optical signal to the reception port of the wavelength path multiplexing / separation unit 1404 within itself.
- the wavelength selection circuit 1402 accepts the wavelength multiplexed optical signal from the optical branching coupler 1403 and the wavelength multiplexed optical signal from the transmission port of the wavelength path multiplexing / separating unit 1405 in its own node. Either one is output to the wavelength path multiplex transmission line connected to itself.
- FIG. 18 is a diagram showing an input / output interface of the wavelength selection circuit (WSS) 1402.
- the wavelength selection circuit (WSS) 1402 is output from a port for inputting an arbitrary wavelength multiplexed optical signal input from each transmission line via the optical branching coupler 1403 and a transponder accommodation function unit 1422 provided in the node.
- the transponder accommodation function unit 1422 and the transponder 1421 correspond to the configuration shown in FIGS. 4 and 6 or the configuration shown in FIGS. 13 and 14.
- transponder accommodation function unit 1422 and the transponder 1421 are as described in the second embodiment or the second embodiment.
- the transponder 1421 includes a fully tunable wavelength tunable optical transmitter 1201, an optical receiver 1202, a client signal processing / optical transmitter 1204, and a client signal processing / optical receiver 1203.
- this embodiment is the same as that of the first embodiment or the second embodiment except that the wavelength selection switch 1402 from the optical transmission device control circuit 1432 needs to be set for the wavelength selection circuit 1402 in the WDM line unit 1423.
- the operation is the same as that described in the embodiment.
- the configuration shown in this embodiment makes it possible to set wavelength signals between arbitrary nodes in an arbitrary network topology having an arbitrary number of wavelength network nodes.
- the first effect is that it is possible to avoid combinations of wavelengths and routes that cannot be selected with respect to the wavelength paths transmitted and received from the wavelength path demultiplexing optical transmission apparatus.
- wavelength paths of a plurality of different wavelengths can be accommodated between the connection ports between the optical matrix switch circuit, which is wavelength path switching / multiplexing / branching means, and the wavelength path multiplexing / demultiplexing unit.
- the second effect is that the wavelength discrimination characteristic required for the wavelength tunable filter is relaxed, and the cost of the system can be reduced.
- the wavelength path multiplexing wavelength paths sharing the same output port can be widened by associating the wavelength path multiplexing ports of the wavelength path multiplexing / demultiplexing unit with the paths with an interval. It is.
- Optical matrix switch circuit 0103 Transponder optical transmitter or receiver 0102 Wavelength path demultiplexing circuit 1506, 1507, 1508, 1509 Transmission path or network 0301, 1701 Optical switch element 0101 Optical matrix switch circuit 0106 Optical switch branching / combining ratio control circuit 0105, 0805 Optical transmission device control circuit 0104 Optical transmission wavelength control circuit 0107 Variable wavelength filter control circuit 0108 Variable wavelength filter 1201 Fully tunable variable wavelength optical transmitter 1202 Optical receiver 1203 Client signal processing / optical receiver 1204 Client signal processing / Optical transmitter 1402 Wavelength selection circuit 1403 Optical branching coupler 1423 WDM line unit 1422 Transponder accommodation function unit 1421 Transponder 1432 Wavelength path multiplexing Hanareko transmission equipment control circuit 0910 Wavelength network management control device
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Abstract
Description
互いに異なる波長の光信号を出力するM(Mは2以上の整数)個の光出力手段と、
前記M個の光出力手段と1対1で接続されたM個の入力ポート、M個の出力ポート、および、前記入力ポートと前記出力ポートとの接続を切り換える切換手段、を備える光スイッチ手段と、
前記M個の出力ポートと1対1で接続されたM個の受付ポート、および、前記受付ポートとの接続が前記受付ポートに入力された光信号の波長に応じて切り換わるN(Nは2以上M以下の整数)個の送出ポート、を備え前記受付ポートが受け付けた光信号に応じた多重光信号を前記送出ポートから送信する波長多重手段と、を含み、
前記切換手段は、前記M個の入力ポートのうちY(Yは2以上M以下の整数)個の特定入力ポートを前記M個の出力ポートのうち1個の特定出力ポートに接続する集約接続を行う場合、前記Y個の特定入力ポートに入力されたY個の光信号を合波して合波信号を生成し、当該合波信号を前記特定出力ポートに出力することによって前記集約接続を行う。
波長多重光信号を受け付けるN(Nは2以上の整数)個の受付ポート、および、前記受付ポートとの接続が前記受付ポートに入力された波長多重光信号が有する波長に応じて切り換わるM(MはN以上の整数)個の送出ポート、を備える波長分離手段と、
前記M個の送出ポートと1対1で接続されたM個の入力ポート、M個の出力ポート、および、前記入力ポートと前記出力ポートとの接続を切り換える切換手段、を備える光スイッチ手段と、
前記M個の出力ポートと1対1で接続され透過波長を選択可能なM個の波長選択手段と、
前記M個の波長選択手段と1対1で接続され自己と接続された前記波長選択手段を透過した光信号を受信するM個の光受付手段と、を含み、
前記切換手段は、前記M個の入力ポートのうち1個の特定入力ポートを前記M個の出力ポートのうちY(Yは2以上M以下の整数)個の特定出力ポートに接続する分岐接続を行う場合、前記特定入力ポートに入力された光信号をY個の分岐信号に分け、当該Y個の分岐信号を前記Y個の特定出力ポートにそれぞれ出力することによって前記分岐接続を行う。
図4は、本発明の第1実施形態としての波長パス多重分離光伝送装置に含まれる送信側装置を示す。
次に、本発明の第2実施形態について図面を参照して詳細に説明する。以下では、第2実施形態について、第1実施形態と異なる点を中心に説明する。
次に、本発明の第3実施形態について図面を参照して詳細に説明する。以下では、第3実施形態について、第1実施形態と異なる点を中心に説明する。
次に、本発明の第4実施形態について図面を参照して詳細に説明する。
0103 トランスポンダ光送信器または受信器
0102 波長パス多重分離回路
1506、1507、1508、1509 伝送路またはネットワーク
0301、1701 光スイッチ素子
0101 光マトリクススイッチ回路
0106 光スイッチ分岐合波比率制御回路
0105、0805 光伝送装置制御回路
0104 光送信波長制御回路
0107 波長可変フィルタ制御回路
0108 波長可変フィルタ
1201 フルチューナブル波長可変光送信器
1202 光受信器
1203 クライアント信号処理・光受信器
1204 クライアント信号処理・光送信器
1402 波長選択回路
1403 光分岐カプラ
1423 WDMライン部
1422 トランスポンダ収容機能部
1421 トランスポンダ
1432 波長パス多重分離光伝送装置制御回路
0910 波長ネットワーク管理制御装置
Claims (14)
- 互いに異なる波長の光信号を出力するM(Mは2以上の整数)個の光出力手段と、
前記M個の光出力手段と1対1で接続されたM個の入力ポート、M個の出力ポート、および、前記入力ポートと前記出力ポートとの接続を切り換える切換手段、を備える光スイッチ手段と、
前記M個の出力ポートと1対1で接続されたM個の受付ポート、および、前記受付ポートとの接続が前記受付ポートに入力された光信号の波長に応じて切り換わるN(Nは2以上M以下の整数)個の送出ポート、を備え前記受付ポートが受け付けた光信号に応じた多重光信号を前記送出ポートから送信する波長多重手段と、を含み、
前記切換手段は、前記M個の入力ポートのうちY(Yは2以上M以下の整数)個の特定入力ポートを前記M個の出力ポートのうち1個の特定出力ポートに接続する集約接続を行う場合、前記Y個の特定入力ポートに入力されたY個の光信号を合波して合波信号を生成し、当該合波信号を前記特定出力ポートに出力することによって前記集約接続を行う、光信号送信装置。 - 請求項1に記載の光信号送信装置において、
前記切換手段は、前記合波信号に含まれるY個の光信号のパワーが互いに等しくなるように、当該Y個の光信号を合波する、光信号送信装置。 - 請求項1または2に記載の光信号送信装置において、
前記送出ポートと前記受付ポートの接続関係と、前記受付ポートと前記出力ポートの接続関係と、前記入力ポートと前記光出力手段の接続関係と、を表す接続情報を記憶した記憶手段と、
前記送出ポートのいずれかである通信用ポートとY種類の通信用波長とを示す設定要求を受け付けると、前記M個の光出力手段のうちY個の光出力手段を前記Y種類の通信用波長の光信号をそれぞれ出力する通信手段として特定し、前記記憶手段内の接続情報を参照して、前記通信手段ごとに、前記M個の入力ポートのうち当該通信手段と接続する前記特定入力ポートと、前記M個の受付ポートのうち前記通信用ポートと接続する特定受付ポートと、前記M個の出力ポートのうち前記特定受付ポートと接続する前記特定出力ポートと、前記特定入力ポートと前記特定出力ポートを接続する前記切換手段内の特定光路と、を特定し、当該特定光路のそれぞれが形成されるように前記切換手段を制御する制御手段と、をさらに含む光信号送信装置。 - 請求項3に記載の光信号送信装置において、
格納手段をさらに含み、
前記制御手段は、前記通信用ポートと、前記通信用波長と、前記通信手段と、前記切換手段内の特定光路と、前記特定入力ポートと、前記特定出力ポートと、前記特定受付ポートと、を示す情報を、前記格納手段に格納する、光信号送信装置。 - 請求項1から4のいずれか1項に記載の光信号送信装置において、
前記切換手段は、第1および第2入力部と第1および第2出力部とを有する光スイッチ素子が互いに同じ向きでM行M列にマトリクス状に配列され、M行目の光スイッチ素子の第1入力部が前記入力ポートと接続され、かつ、M列目の光スイッチ素子の第2出力部が前記出力ポートと接続された光マトリクススイッチであり、
前記光スイッチ素子は、前記集約接続を行う場合には、前記合波信号が生成され、当該合波信号が前記特定出力ポートから出力されるように、クロス状態と、バー状態と、前記第1入力部で受け付けた光信号と前記第2入力部で受け付けた光信号を合波して前記第2出力部から出力する合波状態と、のいずれかの状態になる、光信号送信装置。 - 請求項1から4のいずれか1項に記載の光信号送信装置において、
前記切換手段は、
前記集約接続を行う場合に前記合波信号を生成する生成手段と、
前記生成手段にて生成された合波信号を、前記特定出力ポートに出力する出力切換手段と、を含む、光信号送信装置。 - 波長多重光信号を受け付けるN(Nは2以上の整数)個の受付ポート、および、前記受付ポートとの接続が前記受付ポートに入力された波長多重光信号が有する波長に応じて切り換わるM(MはN以上の整数)個の送出ポート、を備える波長分離手段と、
前記M個の送出ポートと1対1で接続されたM個の入力ポート、M個の出力ポート、および、前記入力ポートと前記出力ポートとの接続を切り換える切換手段、を備える光スイッチ手段と、
前記M個の出力ポートと1対1で接続され透過波長を選択可能なM個の波長選択手段と、
前記M個の波長選択手段と1対1で接続され自己と接続された前記波長選択手段を透過した光信号を受信するM個の光受付手段と、を含み、
前記切換手段は、前記M個の入力ポートのうち1個の特定入力ポートを前記M個の出力ポートのうちY(Yは2以上M以下の整数)個の特定出力ポートに接続する分岐接続を行う場合、前記特定入力ポートに入力された光信号をY個の分岐信号に分け、当該Y個の分岐信号を前記Y個の特定出力ポートにそれぞれ出力することによって前記分岐接続を行う、光信号受信装置。 - 請求項7に記載の光信号受信装置において、
前記切換手段は、前記Y個の分岐信号のパワーが互いに等しくなるように、前記特定入力ポートに入力された光信号を当該Y個の分岐信号に分ける、光信号受信装置。 - 請求項7または8に記載の光信号受信装置において、
前記受付ポートと前記送出ポートの接続関係、前記送出ポートと前記入力ポートの接続関係、および、前記出力ポートと前記光受付手段の接続関係、を表す接続情報を記憶した記憶手段と、
前記受付ポートのいずれかである通信用ポートとY種類の通信用波長とを示す設定要求を受け付けると、前記M個の光受付手段のうちY個の光受付手段を前記Y種類の通信用波長の光信号をそれぞれ受け付ける通信手段として特定し、前記記憶手段内の接続情報を参照して、前記通信手段ごとに、前記M個の出力ポートのうち当該通信手段と接続する前記特定出力ポートと、前記M個の送出ポートのうち前記通信用ポートと接続する特定送出ポートと、前記M個の入力ポートのうち前記特定送出ポートと接続する前記特定入力ポートと、前記特定入力ポートと前記特定出力ポートを接続する前記切換手段内の特定光路と、を特定すると共に、前記M個の波長選択手段のうち当該通信手段と接続する特定波長選択手段の透過波長を前記Y種類の通信用波長のうち当該通信手段が受け付ける通信用波長に設定し、当該特定光路のそれぞれが形成されるように前記切換手段を制御する制御手段と、をさらに含む光信号受信装置。 - 請求項9に記載の光信号受信装置において、
格納手段をさらに含み、
前記制御手段は、前記通信用ポートと、前記通信用波長と、前記通信手段と、前記切換手段内の特定光路と、前記特定入力ポートと、前記特定出力ポートと、前記特定受付ポートと、を示す情報を、前記格納手段に格納する、光信号受信装置。 - 請求項7から10のいずれか1項に記載の光信号受信装置において、
前記切換手段は、第1および第2入力部と第1および第2出力部とを有する光スイッチ素子が互いに同じ向きでM行M列にマトリクス状に配列され、M列目の光スイッチ素子の第1入力部が前記入力ポートと接続され、かつ、M行目の光スイッチ素子の第2出力部が前記出力ポートと接続された光マトリクススイッチであり、
前記光スイッチ素子は、前記分岐接続を行う場合には、前記特定入力ポートに入力された光信号がY個の分岐信号に分けられ、当該Y個の分岐信号が前記Y個の特定出力ポートにそれぞれ出力されるように、クロス状態と、バー状態と、前記第1入力部で受け付けた光信号を2つに分けて前記第1および第2出力部からそれぞれ出力する分岐状態と、のいずれかの状態になる、光信号受信装置。 - 請求項7から11のいずれか1項に記載の光信号受信装置において、
前記切換手段は、
前記分岐接続を行う場合に前記特定入力ポートに入力された光信号を前記Y個の分岐信号に分ける分岐手段と、
前記分岐手段からの前記Y個の分岐信号を、前記Y個の特定出力ポートにそれぞれ出力する出力切換手段と、を含む、光信号受信装置。 - 請求項1から6のいずれか1項に記載の光信号送信装置と、
請求項7から12のいずれか1項に記載の光信号受信装置と、を含む波長多重分離光通信装置。 - 複数の波長パス多重伝送路に対して波長パスを多重または分離する複数のノードを含む波長パスシステムであって、
前記ノードは、
請求項13に記載の波長多重分離光通信装置と、
前記複数の波長パス多重伝送路と1対1で接続された複数の光パワー分岐手段と、
前記複数の波長パス多重伝送路と1対1で接続された複数の波長選択スイッチ手段と、を含み、
前記波長パスは、少なくとも、任意の2ノードのうちの一方に含まれる光出力手段と、他方に含まれる光受付手段と、の間で構成されるものであり、
前記光パワー分岐手段は、自己と接続された波長パス多重伝送路から自ノードへ入力される波長多重光信号を2つに分け、一方の波長多重光信号を、前記複数の波長選択スイッチ手段のうち、当該波長パス多重伝送路以外の波長パス多重伝送路と接続された波長選択スイッチ手段に出力し、他方の波長多重光信号を、自己内の波長分離手段の受付ポートに出力し、
前記波長選択スイッチ手段は、前記光パワー分岐手段からの波長多重光信号と、自ノード内の波長多重手段の送出ポートからの波長多重光信号と、を受け付け、受け付けられた波長多重光信号のいずれかを、自己と接続された波長パス多重伝送路に出力する、波長パスシステム。
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US20120195594A1 (en) | 2012-08-02 |
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