JP6510444B2 - Wavelength cross connect device and module - Google Patents

Description

  The present invention relates to a wavelength cross connect apparatus and module used in an optical network.

  2. Description of the Related Art Conventionally, an optical network composed of optical fibers connecting between a plurality of optical nodes is known. FIG. 19 shows a conventional optical network. The optical network 6 includes an optical cross connect (OXC) 7 that is an optical node, an optical fiber 8 that is a single core fiber that connects OXCs 7, and a client device 9 that is connected to each OXC 7. The optical network 6 transmits a signal of the client apparatus 9 through the optical paths 10 and 11 between the transmitting OXC 7 and the receiving OXC 7 when communication is performed between the client apparatuses 9 on the transmitting side and the receiving side. The transmission side OXC 7 is the OXC 7 to which the transmission side client device 9 is connected. The receiving side OXC 7 is the OXC 7 to which the receiving side client device 9 is connected.

FIG. 20 is a diagram showing functional blocks of the OXC 7 capable of transmitting / receiving signals to / from M (M is a natural number of 2 or more) routes.
The OXC 7 includes NNI (Network Node Interface) function units 71-1 to 71-M, 73-1 to 73-M, an optical switch function unit 72, and a UNI (User Network Interface) function unit 74. In the following description, reference numerals 71-1 to 71-M are written as 71-1 to M, and reference numerals 73-1 to 73-M are written to 73-1 to M. In the present specification, other symbols including "-" are represented similarly. The NNI function units 71-1 to M are provided corresponding to M input routes 801-1 to 80-M, respectively, and the wavelength division multiplexing signals (Wavelength Division Multiplexing signals) input from the input routes 801-1 to M are provided. Processing of amplifying a WDM signal and monitoring of optical path quality.

  The optical switch function unit 72 includes a WXC (Wavelength Cross-connect) function unit 721 and an Add / Drop function unit 722. The NNI function units 73-1 to 73-M are provided corresponding to the M output routes 802-1 to M, respectively. When the NNI function units 73-1 to 73-M output the WDM signals from the optical switch function unit 72 to the output routes 802-1 to 802-M, they amplify the WDM signals and monitor the optical path quality. The UNI function unit 74 has a function of terminating an optical path, and includes a UNI input port, a UNI output port, and a transponder for accommodating a client signal into an optical signal.

  Next, the details of the optical switch function unit 72 will be described. The WXC function unit 721 demultiplexes the WDM signal into optical signals of respective wavelengths, and selects (Throughs), (Drops), and adds (Adds) the demultiplexed optical signal. The Add / Drop function unit 722 has a Drop port for receiving the optical signal extracted from the WXC function unit 721, and an Add port for outputting the optical signal added from the UNI function unit 74 to the WXC function unit 721. . Also, the Add / Drop function unit 722 has a function of connecting the Drop port and the Add port with a desired transponder in the UNI function unit 74.

  The WXC function unit 721 selects whether to pass or extract the optical signal branched for each wavelength. The WXC function unit 721 generates a WDM signal by multiplexing optical signals to be passed to each route, and outputs the WDM signal to the corresponding NNI function units 73-1 to 73-M.

  The Add / Drop function unit 722 outputs the optical signal extracted by the WXC function unit 721 to a desired UNI input port. The UNI function unit 74 converts the extracted optical signal received through the UNI input port from the signal format for wide area transfer into a client signal which is a credit format used by the client apparatus 9, and outputs the signal from each UNI output port. Output to the client device 9.

  Further, when an optical signal is newly added to the optical switch function unit 72 from the client device 9 side, the UNI function unit 74 converts the client signal received from the client device 9 into an optical signal of a signal format for wide area transfer. Then, the optical signal is output to the Add / Drop function unit 722. The Add / Drop function unit 722 transmits the optical signal received from the UNI function unit 74 to the WXC function unit 721. The WXC function unit 721 performs switching such that the received optical signal is output from the desired NNI output port of the NNI function units 73-1 to 73-M. The NNI function units 73-1 to 73-M multiplex the signals input from the respective routes via the WXC function unit 721, and output the multiplexed signals to the corresponding output routes 802-1 to M.

  Next, the configuration of the WXC function unit 721 will be described with reference to a known configuration. As a known configuration of the WXC function unit 721, for example, there is a configuration described in Patent Document 1. FIG. 21 is a diagram showing the configuration of the WXC function unit 721. N shown in this figure is a number defined by N = M, where M is the number of routes. However, in FIG. 21, a Drop port provided on the output side of each 1 × N WSS (Wavelength Selective Switch) 181-1 to M, an Add port provided on the input side of each N × 1 WSS 182-1 to M, The NNI function units 71-1 to 7-M or NNI function units 73-1 to M provided between the input route 801-1 to 80 M or the output direction 802-1 to M and the WXC function unit 721 are omitted. ing.

  The WXC function unit 721 is provided for each of the NNI output ports of the 1 × N WSSs 181-1 to M provided for each NNI input port of the NNI function units 71-1 to M and the NNI output ports of the NNI function units 73-1 to M. N × 1 WSSs 182-1 to M are provided. Further, all the 1 × N WSSs 181-1 to M and the N × 1 WSSs 182-1 to M are connected by an optical fiber in a mesh shape. If, for example, 1 × 9 WSS currently on the market is used as 1 × N WSSs 181-1 to M, OXC 7 capable of supporting up to 8 routes can be configured.

JP, 2010-81374, A

MD Feuer, LENelson, K. Abedin, X. Zhou, TF Taunay, JFFini, B. Zhu, R. Isaac, R. Harel, G. Cohen, DM Marom “ROADM system for space division multiplexing with spatial superchannels,” Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference 2013, March. 2013, PDP5B.8

  As shown in FIG. 19, the OXCs 7 are connected by a single core fiber including one core in the fiber. In recent years, when traffic has increased, it has become an issue how to overcome the capacity limit that can be transmitted by a single core fiber. As a method for solving the problem, an optical transmission technology using a multi-core fiber including a plurality of cores in the fiber has attracted attention.

  The configuration of OXC in an optical network using a multi-core fiber is disclosed in Non-Patent Document 1. In Non-Patent Document 1, OXC uses an output port of 1 × 2 WSS as a plurality of input ports and a plurality of output ports and connects WSS in two stages to pass and extract optical signals transmitted by a multi-core fiber , Allow additional choices.

  However, the OXC described in Non-Patent Document 1 can only select in units of routes, such as outputting the optical signals of all cores in the same route to another route collectively, and can select an arbitrary core. There is a problem in that it is not possible to flexibly set path selection such as connecting optical paths between arbitrary cores.

  In order to solve the problems described above, it is necessary to realize an OXC that enables flexible wavelength path setting even when using a multi-core fiber. Then, a configuration using WXC capable of outputting an arbitrary wavelength from an arbitrary input route and an arbitrary input core to an arbitrary output route and an arbitrary output core can be considered as a solution to the problem. Therefore, in the case where the WXC function unit 721 shown in FIG. 21 is made to correspond to M routes constituted by a multi-core fiber, the configuration proposal is assumed and will be described below.

  FIG. 22 is a diagram showing a configuration proposal in the case where the WXC function unit 721 shown in FIG. 21 corresponds to M routes configured by multi-core fibers. In FIG. 22, each input route 191-1 to M is a multicore fiber with K cores (K is a natural number of 2 or more), and the input cores 191-11 to 1K, 191-21 to 2K,. And 191-M1 to MK, and each input core 191-11 to MK is connected to the NNI input port. Each output route 194-1 to M is a multicore fiber with K cores and has output cores 194-11 to 1K, 194-21 to 2K, ..., 194-M1 to MK, The output cores 194-11 to MK are connected to the NNI output port.

  Although not shown in FIG. 22, an NNI function unit is disposed between the WXC function unit 190 and each input / output route. Specifically, each NNI function unit on the input side has K input cores 191-11 to 1K, 191-21 to 2K,..., K units constituting M input routes 191-1 to M. 191-M1 to K have K NNI input ports connected. In addition, each NNI function unit on the output side has K output cores 194-11 to 1K, 194-21 to 2K, ..., 194-M1 constituting K output routes 194-1 to M. .. Have MK NNI output ports connected to.

  As shown in FIG. 22, the WXC function unit 190 includes 1 × N WSSs 192-11 to MK installed for each of the K NNI input ports corresponding to each of the input routes 191-1 to M and each output route. And N × 1 WSS 193-11 to MK installed for every K NNI output ports corresponding to 194-1 to M. In addition, all 1 × N WSSs 192-11 to MK and N × 1 WSSs 193-11 to MK are connected by an optical fiber in a mesh shape. However, the connection from the input side WSS provided corresponding to an arbitrary input route to the output side WSS corresponding to the output route which is the same route as the input route is excluded.

In the case of the WXC function unit 190, a large number of NNI input ports and NNI output ports for “number of paths (M) × number of cores (K)” are required. The number of output ports of 1 × N WSS 192-11 to MK connected to the NNI input port is only MK. However, Drop port is excluded. The same is true for the number of input ports of the N × 1 WSS 193-11 to MK connected to the NNI output port. In this case, 2KM pieces of 1 × N WSSs 192-11 to MK and N × 1 WSSs 193-11 to MK used in the WXC function unit 190 are required in total. Further, the number of cross points of the optical switch in one wavelength in the WXC function unit 190 is (MK) ² .

  Describing with a specific example, in the case of M = 8 and K = 12, 192 1 × 96 WSSs are required, and the number of cross points is 9,216. As described above, in the WXC function unit 190 shown in FIG. 22, the number of input / output ports of the WSS increases and the number of cross points increases as the number of paths and the number of cores increase. There is a problem of increasing.

  In view of the above circumstances, the present invention selectively converts any wavelength obtained from any input core of any input route using a multi-core fiber to any output core of any output route using a multi-core fiber. It is an object of the present invention to provide a wavelength cross connect device and a module in which an increase in the device scale is suppressed when realizing the WXC function that enables output to

  One embodiment of the present invention is an M1 (M1 is a natural number of 2 or more) input route composed of an optical fiber having K (K is a natural number of 2 or more) input cores or K optical fibers for input And an optical fiber having K output cores or M2 (M2 is a natural number of 2 or more) output routes composed of K output optical fibers are provided in an optical cross connect apparatus connected A wavelength cross connect apparatus for processing a first multiplexed optical signal in which optical signals of a plurality of wavelengths input from the input route are multiplexed, corresponding to each input core or the input optical fiber Are provided, and have M1 first input ports connected to each of the input routes, and M2 first output ports corresponding to each of the output routes, the first input being provided The first multiplexed optical signal input to the port is separated by wavelength. The first output port is switched according to each wavelength of the first optical signal after demultiplexing into one optical signal and the demultiplexed first optical signal and the input optical fiber, and second multiplexing is performed. A first route switching switch for outputting an optical signal, and M second input ports provided M2 corresponding to each of the output routes and connected to the first route switching switch, and Each of the output cores or K second output ports corresponding to the output optical fiber is provided, and the second multiplexed optical signal input from the first path switching switch The second output port is switched according to each wavelength of the demultiplexed second optical signal and each output route, and the third multiplexed optical signal is output. A first core switching switch, or M1 pieces corresponding to the respective input routes. Number of second input ports connected to each of the input cores or the input optical fiber, and K second output ports corresponding to each of the output cores or the output optical fiber. And demultiplexing the first multiplexed optical signal input from the input route into a first optical signal according to wavelength, to each wavelength of the demultiplexed first optical signal and to each input route Accordingly, K second switching switches are provided for switching the second output port and outputting a fourth multiplexed optical signal, and K are provided corresponding to the respective output cores or the output optical fibers, It has M1 first input ports connected to each of the second core changeover switches and M2 first output ports corresponding to each of the output routes, and input from the second core changeover switches The fourth multiplexed optical signal to be divided into wavelength-specific third optical signals, The first output port is switched according to each wavelength of the third optical signal after demultiplexing and each output core or each output optical fiber, and a second multiplexed optical signal is output. And a route switching switch according to any one of the second configurations.

  One embodiment of the present invention is the wavelength cross connect device as described above, wherein the first core switching switch or the second core switching switch comprises K pieces of the second input port and K pieces of the second switch. A first wavelength selective switch having an output port of

  One embodiment of the present invention is the wavelength cross connect device described above, wherein the first route changeover switch or the second route changeover switch comprises M1 first input ports and M2 above. It is a second wavelength selective switch having a first output port.

  One embodiment of the present invention is the above-mentioned wavelength cross connect apparatus, wherein the first wavelength selective switch includes K 1-input K-output wavelength selective switches and K K-input 1 output wavelength selective switches. One consisting of K 1-input K-output wavelength selective switches and K K-input 1-output optical couplers, or K 1-input K-output optical couplers and K K It consists of a wavelength selective switch with one input and one output.

  One embodiment of the present invention is the above-mentioned wavelength cross connect apparatus, wherein the second wavelength selective switch includes M1 single-input M2 output wavelength selective switches and M2 M1 input single-output wavelength selective switches. M1 1-input M2-output wavelength selective switch and M2 M1-input 1-output optical couplers, or M1 1-input M2 output optical couplers and M2 M1 optical couplers It consists of a wavelength selective switch with one input and one output.

  One aspect of the present invention is the wavelength cross connect apparatus described above, wherein the wavelength selective switch for K input / one output and the wavelength selective switch for one input M2 output are configured as a wavelength selective switch for K input / M2 output or K input M2 One in which the optical coupler of output is replaced, or the wavelength selective switch of one input K output and the wavelength selective switch of M1 input one output are replaced by a wavelength selective switch of M1 input K output or an optical coupler of M1 input K output It is.

  One embodiment of the present invention is a module used in the above wavelength cross connect apparatus, wherein the 1-input K-output wavelength selective switch, the K-input 1-output wavelength selective switch, the 1-input M2 output wavelength-selective switch, It is a module in which a plurality of wavelength selective switches of M1 input and 1 output, wavelength selective switches of the K input and M2 output, or wavelength selective switches of the M1 input and K output are integrated.

  One aspect of the present invention is the above-described module, wherein the optical coupler is further integrated.

  One embodiment of the present invention is the wavelength cross connect device described above, wherein the number of the first output ports is M1 + N while the number of the first input ports is M1 in the first route switching switch. (N is a natural number of 1 or more), or K + N (N is 1 or more) of the number of second output ports while the number of the second input ports is K in the second core switching switch And a natural number of

  One embodiment of the present invention is the above-mentioned wavelength cross connect device, wherein a part or all of the connections between each of the first route changeover switches and each of the first core changeover switches is α (α Are connected by an optical fiber of two or more natural numbers), or a part or all of the connections between each of the second core changeover switches and each of the second route changeover switches (α is 2) Connect with the above natural number optical fiber).

  According to the present invention, any wavelength obtained from any input core of any input route using a multi-core fiber can be selectively output to any output core of any output route using a multi-core fiber. In the wavelength cross connect device and the module, an increase in device size can be suppressed.

It is a figure which shows the outline of the optical network in this embodiment. It is a figure which shows the functional block of OXC2 in this embodiment. It is a figure which shows the structural example of the WXC function part 221A in 1st Embodiment. It is a figure which shows the structural example of the WXC function part 221B which becomes a modification of 1st Embodiment. It is a figure which shows the specific example of the core switching switch and route switching switch in 1st Embodiment. It is a figure which shows the specific example of the core switching switch and route switching switch in the modification of 1st Embodiment. It is a figure which shows the detailed specific example of the core switching switch and route switching switch in 1st Embodiment. It is a figure which shows the structural example of the WXC function part 221C in 2nd Embodiment. It is a figure which shows the structural example of WXC function part 221Ca which substituted KxM WSS to the optical coupler of KxM. It is a figure which shows the structural example of WXC function part 221 Cb which substituted 1xK WSS to the optical splitter of 1xK, and substituted Mx1 WSS to the optical splitter of Mx1. It is a figure which shows the structural example of WXC function part 221D in 3rd Embodiment. It is a figure which shows the structural example of WXC function part 221Da which is a modification of 3rd Embodiment. It is a figure which shows the structural example 1 of K serial (1xKWSS) module 81-1 which integrated | stacked K 1xK WSS in 3rd Embodiment. It is a figure which shows the structural example 2 of K serial (1xKWSS) module 81-1 which integrated K 1xK WSS in 3rd Embodiment. It is a figure which shows the structural example of the WXC function part 221E in 4th Embodiment. It is a figure which shows the structural example of the WXC function part 221F in 5th Embodiment. It is a figure which shows the structural example of the WXC function part 221G in 6th Embodiment. It is a figure which shows the structural example of the selector of K'xK SEL33 d-1. FIG. 1 illustrates a conventional optical network. It is a figure which shows the functional block of OXC7. It is a figure which shows the structure of the WXC function part 721. FIG. FIG. 23 is a diagram showing a configuration proposal when the WXC function unit 721 shown in FIG. 21 is made to correspond to a route of a multi-core fiber.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Configuration common to the first to sixth embodiments)
FIG. 1 is a diagram showing an outline of an optical network in the present embodiment. The optical network 1 includes an OXC 2 that is an optical node, an optical fiber 3 that is a multi-core fiber that connects the OXCs 2 to one another, and a client device 9 that is connected to each OXC 2. The optical network 1 communicates light between the OXC 2 to which the transmitting client device 9 is connected and the OXC 2 to which the receiving client device 9 is connected when communication is performed between the transmitting and receiving client devices 9. The optical paths 10 and 11 to be signal paths are set, and signals between the client apparatuses 9 are transferred. The optical fiber 3 is a multi-core fiber including K (K is a natural number of 2 or more) cores. The client device 9 is, for example, a computer or the like, and is a terminal device capable of communication via the optical network 1.

FIG. 2 is a diagram showing functional blocks of the OXC 2 in the present embodiment.
In FIG. 2, the OXC 2 includes NNI function units 21-1 to M and 23-1 to M, an optical switch function unit 22, and a UNI function unit 24. Each of the input routes 301-1 to M includes input cores 301-11 to 1K, ..., 301-M1 to MK as multi-core fibers. Each of the output routes 302-1 to 302-M includes output cores 302-11 to 1K,..., 302-M1 to MK as multi-core fibers. The OXC 2 is a device compatible with the optical network 1 using a multicore fiber. The OXC 2 has a WXC function of selectively outputting any wavelength obtained from any input core 301-11 to MK to any output core 302-11 to MK.

The NNI function units 21-1 to 21-M are provided corresponding to each of the M input routes 301-1 to M, and NNI to NNI are included in the input routes 301-1 to M, respectively. It amplifies the WDM signal input to the input port and monitors the optical path quality. The optical switch function unit 22 includes a WXC function unit (wavelength cross connect device) 221 and an Add / Drop function unit 222.
The WXC function unit 221 has a function of demultiplexing the WDM signal input from the NNI function units 21-1 to M, and selection (Through), extraction (Drop), and addition (Add) of the demultiplexed optical signal. And the ability to The Add / Drop function unit 222 includes a Drop port for receiving the optical signal extracted from the WXC function unit 221, and an Add port for outputting the optical signal added from the UNI function unit 24 to the WXC function unit 221. . The Add / Drop function unit 222 has a function of connecting the Drop port and the Add port with a desired transponder in the UNI function unit 24.

  The NNI function units 23-1 to 23-M are provided corresponding to the M output routes 302-1 to 302-M, amplify the WDM signal from the optical switch function unit 22, and monitor the optical path quality. The NNI function units 23-1 to M output the amplified WDM signals to the output cores 302-11 to MK included in the output routes 302-1 to M through the NNI output port. The number of NNI input ports of the NNI function units 21-1 to 21-M and the number of NNI output ports of the NNI function units 23-1 to 23-M are both M × K. The UNI function unit 24 has a function of terminating an optical path, and includes a UNI input port, a UNI output port, and a transponder for accommodating a client signal in an optical signal.

  Next, the operation of the OXC 2 will be described. The NNI function units 21-1 to 21-M amplify the WDM signals input from the input cores 301-11 to MK included in the input routes 301-1 to M, and output the amplified signals to the WXC function unit 221. The WXC function unit 221 demultiplexes the WDM signal received from the NNI function units 21-1 to 21-M, and selects whether to pass or extract the demultiplexed optical signal.

  The Add / Drop function unit 222 outputs the optical signal extracted by the WXC function unit 221 to a desired UNI input port. The UNI function unit 24 converts the extracted optical signal received through the UNI input port from the signal format for wide area transfer into a client signal which is a credit format used by the client apparatus 9, and outputs the signal from each UNI output port. Output to the client device 9.

  Also, when an optical signal is newly added to the optical switch function unit 22 from the client device 9 side, the UNI function unit 24 converts the client signal received from the client device 9 into an optical signal of a signal format for wide area transfer. Then, the optical signal is output to the Add / Drop function unit 722. The Add / Drop function unit 222 transmits the optical signal received from the UNI function unit 24 to the WXC function unit 221. The WXC function unit 221 performs switching on the received optical signal so as to be output from the desired NNI output port of the NNI function unit 23-M, and performs multiplexing corresponding to each output port. Generate and output a signal. The NNI function unit 23-1M amplifies the WDM signal output from the WXC function unit 221 and outputs the amplified signal to the output cores 302-11 to MK of the corresponding output route 302-1 to 302-M.

  Next, specific configurations of the WXC function unit 221 will be described as WXC function units 221A to 221G in FIGS. 3 to 9 and 12 to 14 and will be described as first to sixth embodiments. 3 to 9 and 12 to 14 are NNI function units 21 to 1 provided between the input routes 301-1 to M or output routes 302-1 to M and the WXC function units 221A to 221G. The M and NNI function units 23-1 to M are omitted. Further, the WXC function units 221A to 221G illustrated in FIGS. 3 to 9 and 12 to 14 also omit the configurations related to the Drop process and the Add process. The WXC functional units 221A to 221G illustrated in FIGS. 5 to 9 and 12 to 14 simplify the configuration regarding the input core and the output core. In the WXC function units 221A to 221G according to the first to sixth embodiments, although the configuration in which the input route and the output route have the same number of M is shown, the present invention is not limited to this. . For example, the WXC function units 221A to 221G are configured to correspond to M1 (M1 is a natural number of 2 or more) input routes and M2 (M2 is a natural number of 2 or more) output routes. In addition to the configuration of M1 = M2 shown in the embodiment, the configuration may be such that M1 and M2 have different numbers.

First Embodiment
FIG. 3 is a diagram showing a configuration example of the WXC function unit 221A in the first embodiment.
As shown in FIG. 3, the WXC function unit 221A is a multi-core in which M input routes 301-1 to M and output routes 302-1 to M and each route is configured by K cores It corresponds to a configuration that is a fiber. The WXC function unit 221A is configured for each core switching function unit 31 capable of switching the core as an output destination independently for each route and each wavelength, and for the optical signal output from the core switching function unit 31. And a route switching function unit 32 capable of switching a route to which the output destination is independently output for each of the core and each wavelength. The core switching function unit 31 and the route switching function unit 32 demultiplex the WDM signal input from each input port, and select and output an arbitrary output port for each wavelength of the demultiplexed optical signal, A plurality of optical signals received at each output port are combined and output as a WDM signal.

  The core switching function unit 31 includes M pieces of K input / output K core switching switches 31-1 to M provided corresponding to the input routes 301-1 to M, respectively. The core switching function unit 31 is configured of M core switching switches 31-1 to M in order to perform switching independently for each route. The route switching function unit 32 includes K M-input / M-output route switching switches 32-1 to K. The route switching function unit 32 is configured by K route switching switches 32-1 to K in order to perform switching independently for each core. The number of input ports of the WXC function unit 221A (= number of NNI input ports) and the number of output ports (= number of NNI output ports) are respectively MK.

  K input ports included in each of the core switching switches 31-1 to M are K NNI input ports connected to K input cores 301-11 to MK configuring each input route 301-1 to M. Connected to The K output ports of each of the core switching switches 31-1 to M are connected to different route switching switches 32-1 to M, respectively. The input ports of the core changeover switches 31-1 to 31-M are connected to the K input cores 301-11 to MK constituting the input routes 301-1 to M via an NNI input port. K optical fibers are connected to the output ports of the core changeover switches 31-1 to 31-M. The K optical fibers connected to the output ports of the core changeover switches 31-1 to M are connected to the corresponding input ports of the route changeover switches 32-1 to K, respectively. That is, all the output ports of the core changeover switches 31-1 to M are connected to all the input ports of the route changeover switches 32-1 to 32 K in a mesh shape by MK single core fibers (full mesh connection) .

  The output ports of the route switching switches 32-1 to 32 -K are connected to the MK output cores 302-11 to MK constituting the output route 302 via the NNI output port. The route switching switches 32-1 to K have M input ports and M output ports. The input ports of the route switching switches 32-1 to K are connected to different core switching switches 31-1 to M, respectively. The output ports of the route switching switches 32-1 to K are connected to different output routes 302-1 to M through NNI output ports.

  A control method when setting an optical path in the WXC function unit 221A shown in FIG. 3 will be described. Describes a control method when setting an optical path from a specified NNI input port corresponding to a specified input route and input core to a specific NNI output port corresponding to a specified output route and output core . In this case, it is assumed that, for example, the core switching switch 31-1 is connected to a specific NNI input port, and, for example, the route switching switch 32-1 is connected to a specific NNI output port.

  The control in the core switching switch 31-1 is control for connecting the input port connected to the NNI input port and the output port connected to the route switching switch 32-1. The control in the path switching switch 32-1 is control to connect the input port connected to the core switching switch 31-1 and the output port connected to the NNI output port. Thus, by controlling the core switching switch 31-1 and the route switching switch 32-1, an optical signal of an arbitrary wavelength obtained by demultiplexing the plurality of WDM signals input from the plurality of NNI input ports Can be delivered to a particular NNI output port. That is, the WXC function unit 221A can set an optical path from the specified input route and input core to the specified output route and output core.

The configuration of the WXC function unit 221A shown in FIG. 3 has the following two effects as compared with the configuration proposal of the WXC function unit 190 shown in FIG.
The first effect is that the number of output ports of the core changeover switches 31-1 to M and the number of input ports of the route changeover switches 32-1 to 32 K can be significantly reduced as compared with the prior art. . In FIG. 3, the number of output ports of each of the core changeover switches 31-1 to M is K, and the number of input ports of each of the route changeover switches 32-1 to K is M. On the other hand, in the conventional configuration shown in FIG. 22, MK output ports of 1 × N WSSs 192-11 to MK and input ports of N × 1 WSSs 193-11 to MK are respectively required. Furthermore, the number of input ports of the unit and the number of output ports for example 1 × N WSS192-11~1K and N × 1 WSS193-11~1K of WSS corresponding to route the one as in FIG. 3, respectively MK ² It becomes a book.

The second effect is that the number of cross points of the core switching switches 31-1 to M and the route switching switches 32-1 to K can be significantly reduced as compared with the prior art. The number of cross points is calculated by the number of input ports of the optical switch × the number of output ports. In Figure 3, the cross points of each core switching switch 31-1~M is ^{K 2.} Cross points of the route change-over switch 32-1~K is a ^{M 2.} Therefore, the number of cross points in the entire WXC function unit 221A is MK (M + K). On the other hand, in the conventional configuration shown in FIG. 22, the number of cross points in the entire WXC function unit 190 is (MK) ² . As a specific example, when M = 8 and K = 12, the number of cross points is 9,216 in the conventional configuration shown in FIG. 22, and the number of cross points is 1 in the configuration of the first embodiment shown in FIG. , 920 and about 1/5.

  As described above, the WXC function unit 221A according to the first embodiment can reduce the number of input / output ports of the optical switch and the number of cross points as compared with the conventional configuration. Thus, the WXC function unit 221A of the first embodiment can realize a more miniaturized wavelength cross connect device. Then, the optical cross connect apparatus including the WXC function unit 221A can realize downsizing and cost reduction.

(Modification of the first embodiment)
Next, a modification of the WXC function unit 221A shown in FIG. 3 will be described. A WXC function unit 221B having a configuration in which the order of the core switching function unit 31 and the route switching function unit 32 as shown in FIG. 4 is reversed from that of FIG. 3 will be described. FIG. 4 is a diagram showing a configuration example of the WXC function unit 221B which is a modification of the first embodiment. In the components shown in FIG. 4, the same components as those in FIG. 3 are assigned the same reference numerals, and the description will be simplified or omitted.

  As shown in FIG. 4, the WXC function unit 221 B outputs the optical signals output from the route switching function unit 32 to which the WDM signals from the input routes 301-1 to M are input and the route switching function unit 32. And a core switching function unit 31 for performing processing. The route switching function unit 32 includes K M-input / M-output route switching switches 32-1 to K. The M input ports of each of the route switching switches 32-1 to K are connected to the NNI input port. The M output ports of the route switching switches 32-1 to K are connected to the input ports of the core switching switches 31-1 to M, respectively. K optical fibers are connected to the output ports of the core changeover switches 31-1 to 31-M. The K optical fibers connected to the output ports of the core changeover switches 31-1 to M are connected to the MK output cores 302-11 to MK constituting the output path 302 via the NNI output port. Ru.

  Also in the case of the configuration of the WXC function unit 221B shown in FIG. 4, the same effect as that of the WXC function unit 221A shown in FIG. 3 can be obtained. That is, the WXC function unit 221B, which is a modified example of the first embodiment, can reduce the number of input / output ports of the optical switch and the number of cross points as compared with the conventional configuration shown in FIG. As a result, the WXC function unit 221B, which is a modified example of the first embodiment, can realize a wavelength cross connect device that is further miniaturized. Then, the optical cross connect apparatus including the WXC function unit 221B can realize downsizing and cost reduction.

(Specific example of the first embodiment)
Next, a configuration using a wavelength selective switch (WSS) will be described as a specific example of the core switching switches 31-1 to M and the route switching switches 32-1 to K shown in FIG. FIG. 5 is a view showing a specific example of the core switching switch and the route switching switch in the first embodiment. In the components shown in FIG. 5, the same components as those shown in FIG. 3 or the same components are denoted by the same reference numerals, and the description will be simplified or omitted.

  As shown in FIG. 5, the core changeover switches 31-1 to 31 -M in FIG. 3 can be configured by M K × K WSSs 31 a-1 to M. The route switching switches 32-1 to K in FIG. 3 can be configured by K M × M WSSs 32a-1 to K. K × K WSSs 31 a-1 to M are wavelength selection switches having K input ports for inputting a WDM signal and K output ports for outputting a WDM signal. A wavelength selective switch (WSS) is a device having a function capable of outputting an optical signal obtained by demultiplexing a WDM signal to an arbitrary output port in wavelength units. The WSS in the present embodiment has a contention-less function that can select an output port without restriction for each wavelength and each input port with respect to an input signal.

  By using K × K WSSs 31 a-1 to M as core switching switches 31-1 to M, a core switching function unit 31 capable of selecting an output core for each core and each wavelength can be realized. By using M × M WSSs 32 a-1 to K as the route switching switches 32-1 to K, it is possible to realize the route switching function unit 32 which can select the output route for each route and each wavelength.

  A control method for setting an optical path in the WXC function unit 221A shown in FIG. 5 will be described. Describes a control method when setting an optical path from a specified NNI input port corresponding to a specified input route and input core to a specific NNI output port corresponding to a specified output route and output core . In this case, for example, K × K WSS 31 a-1 is connected to a specific NNI input port, and for example, M × M WSS 32 a-1 is connected to a specific NNI output port.

  The control in the K × K WSS 31 a-1 is control to connect the input port connected to the NNI input port and the output port connected to the M × M WSS 32 a-1. The control in the M × M WSS 32 a-1 is control for connecting the input port connected to the K × K WSS 31 a-1 and the output port connected to the NNI output port. In this manner, by controlling the K × K WSS 31a-1 and the M × M WSS 32a-1, a plurality of WDM signals input from a plurality of NNI input ports are demultiplexed to acquire an optical signal of an arbitrary wavelength. A WDM signal obtained by multiplexing the acquired optical signals of arbitrary wavelengths can be made to reach a specific NNI output port. As described above, the core switching function unit 31 is configured by M K × K WSSs 31 a-1 to M, and the route switching function unit 32 is configured by K M × M WSSs 32 a-1 to K. A function similar to that of the WXC function unit 221A shown in FIG.

(Specific Example of Modification of First Embodiment)
Next, specific examples of the core switching switches 31-1 to M and the route switching switches 32-1 to 32K illustrated in FIG. 4 will be described. FIG. 6 is a view showing a specific example of the core switching switch and the route switching switch in the modification of the first embodiment. The WXC function unit 221B shown in FIG. 6 has a configuration in which the order of the core switching function unit 31 and the route switching function unit 32 is reversed from that of FIG. The core changeover switches 31-1 to 31-M in FIG. 4 can be configured by M K × K WSSs 31a-1 to M. The route changeover switches 32-1 to K shown in FIG. 4 can be configured by K M × M WSSs 32a-1 to K. As described above, the core switching function unit 31 is configured by M K × K WSSs 31 a-1 to M, and the route switching function unit 32 is configured by K M × M WSSs 32 a-1 to K. A function similar to that of the WXC function unit 221B shown in FIG.

  The WXC function unit 221B shown in FIG. 6 can reduce the number of input / output ports of the optical switch and the number of cross points as compared with the conventional configuration shown in FIG. As a result, the WXC function unit 221B, which is a modified example of the first embodiment, can realize a wavelength cross connect device that is further miniaturized. Then, the optical cross connect apparatus including the WXC function unit 221B can realize downsizing and cost reduction.

(Detailed Example of First Embodiment)
Next, a configuration using 1 × K WSS and K × 1 WSS will be described as a specific example of the core switching switches K × K WSSs 31 a-1 to M shown in FIG. 5. A configuration using 1 × M WSS and M × 1 WSS will be described as a specific example of the route switching switch M × M WSS 32a-1 to K shown in FIG. FIG. 7 is a diagram showing a detailed specific example of the core switching switch and the route switching switch in the first embodiment. In the components shown in FIG. 7, the same components as those shown in FIG. 5 or the same components are denoted by the same reference numerals, and the description will be simplified or omitted.

  As shown in FIG. 7, each of the K × K WSSs 31 a-1 to M shown in FIG. 5 is configured by K 1 × K WSSs 31 a-11 to 11 K and K K × 1 WSSs 31 a to 121 to 12 K. In FIG. 7, 1 × K WSSs 31 a-11 K and K × 1 WSSs 31 a-12 K are omitted to prevent the drawing from being complicated. Further, for the same reason, the symbols for 1 × K WSS and K × 1 WSS in K × K WSS 31 a-2 and K × K WSS 31 a -M are also omitted.

  The output ports of the K 1 × K WSSs 31 a-11 to 11 K are connected in full mesh with the input ports of the K K × 1 WSSs 31 a-12 to 12 K. The 1 × K WSS is a device having one input port for inputting a WDM signal and K output ports for outputting a WDM signal, and having a function capable of selecting an output port in wavelength units. The K × 1 WSS is a device having K input ports for inputting a WDM signal and one output port for outputting a WDM signal, and having a function capable of selecting an input port in wavelength units. The manufacturing technology of this 1 × K WSS is established if K = 20 or less, and it is a device marketed as a product.

  As shown in FIG. 7, M × M WSSs 32 a-1 to K shown in FIG. 5 are configured by M 1 × M WSSs 32 a-11 to 11 M and M K × 1 WSSs 32 a-121 to 12 M. In addition, in FIG. 7, in order to prevent the drawing from being complicated, reference numerals for 1 × M WSS and M × 1 WSS in the M × M WSS 32a-2 are omitted. The output ports of the M 1 × M WSSs 32 a-11 to 11 M are connected to the input ports of the M M × 1 WSSs 32 a-121 to 12 M by full mesh.

  Thus, K × K WSS can be configured by combining 1 × K WSS and K × 1 WSS. The core switching function unit 31 shown in FIG. 7 has a function of selecting an output core for each input core and each wavelength. The route switching function unit 32 shown in FIG. 7 has a function of selecting an output route for each input route and each wavelength.

  A control method when setting an optical path in the WXC function unit 221A shown in FIG. 7 will be described. Describes a control method when setting an optical path from a specified NNI input port corresponding to a specified input route and input core to a specific NNI output port corresponding to a specified output route and output core . For example, it is assumed that, for example, 1 × K WSSs 31a to 111 are connected to a specific NNI input port, and, for example, M × 1 WSSs 32a to 121 are connected to a specific NNI output port. In this case, the WXC function unit 221A is connected between the 1 × K WSS 31a-111 and the M × 1 WSS 32a-121 in addition to the 1 × K WSS 31a-111 and the M × 1 WSS 32a-121. 1 Control the WSSs 31a-121 and 1 × M WSSs 32a-111.

  The control in the 1 × K WSS 31 a-11 1 is control for connecting the input port connected to the NNI input port and the output port connected to the K × 1 WSS 31 a-121. The control in the K × 1 WSS 31 a-121 is control to connect an input port connected to the 1 × K WSS 31 a-1111 and an output port connected to the 1 × M WSS 32 a-111. The control in the 1 × M WSS 32 a-11 1 is a control for connecting an input port connected to the K × 1 WSS 31 a-121 and an output port connected to the M × 1 WSS 32 a-121. The control in the M × 1 WSSs 32a to 121 is control to connect an input port connected to the 1 × M WSSs 32a to 111 and an output port connected to the NNI output port.

  Thus, by controlling 1 × K WSS 31a-111, K × 1 WSS 31a-121, 1 × M WSS 32a-111 and M × 1 WSS 32a-121, the WDM signal input from a specific NNI input port is divided. It is possible to wave to acquire an optical signal of an arbitrary wavelength, and a WDM signal obtained by multiplexing the acquired optical signals of an arbitrary wavelength can reach a specific NNI output port. Thus, the WXC function unit 221A illustrated in FIG. 7 can set the designated input route and the optical path from the input core to the designated output route and output core.

  As described above, the WXC function unit 221A shown in FIG. 7 is an N in a technology field of an optical network, using 1 × N (N is a natural number of 2 or more) wavelength selective switches (WSS) whose technology is mature. × N Implement WSS. As a result, in addition to the effects of the WXC function unit 221A shown in FIG. 3 described above, the WXC function unit 221A shown in FIG. 7 can improve the reliability of the apparatus and suppress the cost.

  In FIG. 7, the WSS may be replaced by an optical coupler which is a more inexpensive device. Specifically, in FIG. 7, either one of 1 × K WSS and K × 1 WSS is replaced with a 1 × K optical coupler or a K × 1 optical coupler. Since the optical coupler only has the function of distributing (or aggregating) WDM signals, it replaces one of the two WSSs. This allows the other WSS to select an input port (or output port) for each wavelength.

  Even if one of 1 × K WSS and K × 1 WSS in FIG. 7 is replaced with a 1 × K optical coupler or a K × 1 optical coupler in this manner, the same effect as the WXC functional unit 221A shown in FIG. 7 is obtained. Can be played. Thereby, in addition to the effect of the WXC function part 221A shown in FIG. 7, it can implement | achieve using a cheaper optical device. In the configuration of FIG. 7 as well, as shown in the above-described modification, the order of the core switching function unit 31 and the route switching function unit 32 can be reversed.

Second Embodiment
Next, a second embodiment of the present invention will be described.
FIG. 8 is a diagram showing a configuration example of the WXC function unit 221C in the second embodiment. As shown in FIG. 8, the WXC function unit 221C is provided with K 1-piece K-output 1 × K WSS 81-11 to MK provided corresponding to each input route 301-1 to M, and each input route K input M outputs K × M WSS 82-11 to MK provided corresponding to each of 301 to M and M input 1 provided for each of K corresponding to each output route 302-1 to M An output M × 1 WSS 83-11 to MK is provided.

  In the components shown in FIG. 8, the same components as those shown in FIG. 7 or the same components are denoted by the same reference numerals, and the description will be simplified or omitted. Further, in FIG. 8, 1 × K WSS 81-1 K, 1 × K WSS 81-2 K,..., 1 × K WSS 81 connected to the K-th input core of each input route to prevent the drawing from becoming complicated. -MK is omitted. Similarly, K × M WSS 82-1 K, K × M WSS 82-2 K,..., K × M WSS 82-MK corresponding to the above 1 × K WSS 81-1 K etc. and K th output core of each output route are connected M × 1 WSS 83-1K, M × 1 WSS 83-2 K,..., M × 1 WSS 83-MK are omitted.

  The WXC function unit 221C shown in FIG. 8 is a configuration using K × M WSS having contention that is mature in the technical field of optical networks. The WXC function unit 221C shown in FIG. 8 has a configuration in which K × 1 WSS of the core switching function unit 31 shown in FIG. 7 and 1 × M WSS of the route switching function unit 32 are replaced by one K × W WSS. It is. The K × M WSS with contention has K input ports for inputting a WDM signal and M output ports for outputting a WDM signal, in wavelength units of an optical signal obtained by dividing the WDM signal. It is a device having a function capable of selecting an output port (or input port). Here, having contention means that only one input port and one output port can be selected for each wavelength, and two or more signals of the same wavelength can not be passed simultaneously. This contention-based K × M WSS changes part (K−1) of N (eg, N = K + M−1) output ports to an input port in a device having the same structure as 1 × N WSS It can be realized only by K × M WSS can be realized by devices sold in the market if the total number of ports determined by K + M is small.

  A control method for setting an optical path in the WXC function unit 221C shown in FIG. 8 will be described. Describes a control method when setting an optical path from a specified NNI input port corresponding to a specified input route and input core to a specific NNI output port corresponding to a specified output route and output core . For example, it is assumed that 1 × K WSS 81-11 is connected to a specific NNI input port and, for example, M × 1 WSS 83-11 is connected to a specific NNI output port. In this case, for example, the WXC function unit 221C is connected between the 1 × K WSS 81-11 and the M × 1 WSS 83-11 in addition to the 1 × K WSS 81-11 and the M × 1 WSS 83-11. Control the K × M WSS 82-11.

  The control in the 1 × K WSS 81-11 is control for connecting an input port connected to the NNI input port and an output port connected to the K × M WSS 82-11. The control in the K × M WSS 82-11 is control for connecting an input port connected to the 1 × K WSS 81-11 and an output port connected to the M × 1 WSS 83-11. The control in the M × 1 WSS 83-11 is control to connect the input port connected to the K × M WSS 82-11 and the output port connected to the NNI output port.

  Thus, by controlling the 1 × K WSS 81-11, the K × M WSS 82-11 and the M × 1 WSS 83-11, the WDM signal input from a specific NNI input port is demultiplexed into an arbitrary wavelength. An optical signal can be acquired, and a WDM signal obtained by multiplexing the acquired optical signals of arbitrary wavelengths can be made to reach a specific NNI output port. Thus, the WXC function unit 221C shown in FIG. 8 can set the designated input route and the optical path from the input core to the designated output route and output core.

  The WXC function unit 221C shown in FIG. 8 has the following advantages over the configuration of the WXC function unit 221A shown in FIG. The WXC function unit 221A shown in FIG. 7 passes through four WSSs until an optical signal is output from the NNI input port to the NNI output port. On the other hand, in the WXC function unit 221C shown in FIG. 8, the number of passing WSSs is three. That is, the WXC function unit 221C shown in FIG. 8 reduces the number of WSSs to be used and reduces the number of WSSs passing from the NNI input port to the NNI output port, as compared with the WXC function unit 221A shown in FIG. be able to. Thus, the WXC function unit 221C shown in FIG. 8 can reduce the loss (in-node loss) of the optical signal in the device more than the WXC function unit 221A shown in FIG.

  As described above, the WXC function unit 221C shown in FIG. 8 obtains the effect of reducing the number of parts and the loss in the node, in addition to the advantage of using the matured technology, by using the K × M WSS having contention. be able to. In the configuration of FIG. 8, 1 × M WSS → M × K WSS → K × 1 WSS may be adopted in which the order of 1 × K WSS → K × M WSS → M × 1 WSS is reversed.

(Modification of the second embodiment)
Next, a modification of the second embodiment of the present invention will be described.
As a first modified example, a configuration in which one WSS is replaced with an optical coupler (CPL) or an optical splitter (SPL) in the configuration of the WXC function unit 221C shown in FIG. 8 will be described.

  FIG. 9 is a diagram showing a configuration example of the WXC functional unit 221Ca in which K × M WSS is replaced with a K × M optical coupler. In the constituent elements shown in FIG. 9, the same components as those shown in FIG. 8 or the same functions are denoted by the same reference numerals, and description thereof will be simplified or omitted. As shown in FIG. 9, the WXC function unit 221Ca has 1 input K outputs 1 × K WSS 81-11 to MK, and K input M outputs provided K for each input route 301-1 to M. And M × 1 WSSs 83-11 to MK. The WXC function unit 221Ca shown in FIG. 9 is configured by replacing K × M WSS 82-11 to MK of the WXC function unit 221C shown in FIG. 8 with K × M CPL (K × M optical coupler) 82a-11 to MK. It is.

  In this configuration, the K × M CPLs 82 a-11 to MK perform aggregation and distribution of WDM signals. The input port and output port of the K × M CPL 82a-11 to MK are selected by selecting the output port of the 1 × K WSS 81-11 to MK of the former stage and the input port of the M × 1 WSS 83-11 to MK of the latter stage Be done.

  A configuration in which K × M WSS is replaced by a K × M optical coupler as in the WXC function unit 221Ca shown in FIG. 9 can reduce the number of WSSs more than the configuration of the WXC function unit 221C shown in FIG. The cost reduction of the device can be realized. The control method when setting an optical path in the WXC function unit 221Ca shown in FIG. 9 is substantially the same as the control method in the WXC function unit 221C shown in FIG. Then, by replacing the K × M WSS with the K × M optical coupler, the WXC function unit 221Ca shown in FIG. 9 does not need to control the optical switch, which is necessary in the configuration using the K × M WSS. That is, the WXC function unit 221Ca shown in FIG. 9 is easier to control than the WXC function unit 221C shown in FIG.

  As a second modification, a configuration in which one WSS is replaced with an optical splitter (SPL) in the configuration of the WXC function unit 221C shown in FIG. 8 will be described. FIG. 10 is a diagram showing a configuration example of the WXC functional unit 221Cb in which 1 × K WSS is replaced with a 1 × K optical splitter and M × 1 WSS is replaced with an M × 1 optical splitter. In the components shown in FIG. 10, the same components as those shown in FIG. 8 or the same components are denoted by the same reference numerals, and the description will be simplified or omitted.

  As shown in FIG. 10, the WXC function unit 221Cb is provided with K 1 input K outputs 1 × K SPL 81a-11 to MK provided corresponding to each input route 301-1 to M, and K input M output K × M WSSs 82-11 to MK and M × 1 SPLs 83a-11 to MK provided with K for each of the output routes 302-1 to M. In the configuration of the WXC function unit 221C shown in FIG. 8, the WXC function unit 221Cb shown in FIG. 10 replaces the 1 × K WSS 81-11 to MK with 1 × K SPL 81a-11 to MK, and M × 1 WSS 83-11 to MK Are replaced with M × 1 SPL 83a-11 to MK. In this configuration, the 1 × K SPLs 81 a-11 to MK distribute WDM signals, and the M × 1 SPLs 83 a-11 to MK collect WDM signals. By selecting the input port and output port of K × M WSS 82-11 to MK, the output port at the position of 1 × K SPL 81a-11 to MK and the input port at the position of M × 1 SPL 83a-11 to MK, respectively Will be selected.

  The configuration in which 1 × K WSS and M × 1 WSS are replaced with 1 × K optical splitter and M × 1 optical splitter like the WXC function unit 221Cb shown in FIG. 10 is the same function as the WXC function unit 221C shown in FIG. Is realized. The WXC function unit 221Cb illustrated in FIG. 10 can reduce the number of WSSs in the apparatus more than the WXC function unit 221C illustrated in FIG. The control method when setting an optical path in the WXC function unit 221Cb shown in FIG. 10 is substantially the same as the control method in the WXC function unit 221C shown in FIG. Then, the WXC function unit 221Cb illustrated in FIG. 10 does not require the control of the optical switch that is necessary in 1 × K WSS and M × 1 WSS. That is, the WXC function unit 221Cb shown in FIG. 10 is easier to control than the WXC function unit 221C shown in FIG.

Third Embodiment
Next, a third embodiment of the present invention will be described.
FIG. 11 is a diagram showing a configuration example of the WXC function unit 221D in the third embodiment. As shown in FIG. 11, the functional configuration of FIG. 8 and the WSS is the same. A point different from FIG. 8 in FIG. 11 is that K pieces of WSSs are integrated into one module (wavelength cross connect module) as the WSs of the K series. In the components shown in FIG. 11, the same components as those shown in FIG. 8 or the same components are denoted by the same reference numerals, and the description will be simplified or omitted. Also in FIG. 11, the same omission as in FIG. 8 is performed.

  In FIG. 11, a K-series (1 × K WSS) module 81-1 combines K 1 × K WSSs 81-11 to 1K connected to K input cores of the input route 301-1 into one module. Accumulate. Similarly, the K-series (1 × K WSS) module 81-2 integrates K 1 × K WSS 81-21-2K connected to K input cores of the input route 301-2 into one module. Do. The K-series (1 × K WSS) module 81-M integrates K 1 × K WSSs 81-M1 to MK connected to K input cores of the input route 301-M into one module.

  The K-series (K × M WSS) module 82-1 integrates the K K × M WSSs 82-11 to 1K of the second stage into one module. The K-series (K × M WSS) module 82-2 integrates K K × M WSSs 82-21 to 2K into one module. The K-series (K × M WSS) module 82-M integrates K K × M WSSs 82-M1 to MK into one module. The input ports of the K-series (K × M WSS) modules 82-1 to M are connected to the output ports of the K-series (1 × K WSS) modules 81-1 to M, respectively.

  The K-series (M × 1 WSS) module 83-1 integrates the K M × 1 WSSs 83-11 to 1K of the third stage into one module. The K-series (M × 1 WSS) module 83-2 integrates K M × 1 WSSs 83-21 to 2K into one module. The K-series (M × 1 WSS) module 83-M integrates K M × 1 WSSs 83-M1 to MK into one module. The output ports of the K-series (M × 1 WSS) modules 83-1 to 83-M are connected to the output cores of the output routes 302-1 to 302-M via the NNI output port.

  The WXC function unit 221D illustrated in FIG. 11 has the following advantages by integrating a plurality of WSSs into one module. The WXC function unit 221D illustrated in FIG. 11 can realize an optical cross connect device with a smaller number of modules than the number of WSSs as compared with the WXC function unit 221C illustrated in FIG. The WXC function unit 221D illustrated in FIG. 11 can realize the optical cross connect device with only 3M modules in which M, which is the number of input routes, is multiplied by 3 modules corresponding to one input route. By using the integrated module, the WXC function unit 221D illustrated in FIG. 11 can reduce the number of parts, and can realize the node configuration more simply.

(Modification of the third embodiment)
Next, a modification of the third embodiment of the present invention will be described.
The modification of the third embodiment integrates a plurality of WSSs and an optical coupler into one module. FIG. 12 is a diagram showing a configuration example of the WXC function unit 221Da which is a modified example of the third embodiment. In the constituent elements shown in FIG. 12, the same components as those shown in FIG. 11 or the same components are denoted by the same reference numerals, and description thereof will be simplified or omitted. The WXC function unit 221Da shown in FIG. 12 differs from the WXC function unit 221D shown in FIG. 11 in the K-series (1 × K WSS) module 81-1 and the K-series (K × M WSS) module 82-1 and the K-series (K × M WSS) module 82-1. A series (1 × K WSS) module 81-2 and a K series (K × M WSS) module 82-2,..., A K series (1 × K WSS) module 81-M and a K series (K × M WSS) module 82-M are integrated into one module, and K × M WSS is replaced with K × M CPL.

  As replacement of CPL, the WXC function unit 221Da illustrated in FIG. 12 includes K K × M WSSs 82-11 to 1K, K K × M WSSs 82-21 to 2K,. M WSS 82-M1 to MK are replaced by K × M CPL 82a-11 to 1K, K pieces of K × M CPL 82a-21 to 2K,..., K pieces of K × M CPL 82a-M1 to MK. The WXC function unit 221Da illustrated in FIG. 12 is a module 84-1 in which 1 × K WSSs 81-11 to 1K and K × M CPLs 82a-11 to 1K are integrated in one module, and 1 × K WSS 81–21 to 2K and K A module 84-2 in which the × M CPLs 82a-21 to 2K are integrated in one module, and a module 84-M in which the 1 × K WSS81-M1 to MK and the K × M CPL 82a-M1 to MK are integrated in one module And For the planar lightwave circuit shown in FIG. 14 described later, K K × M optical couplers may be integrated.

  As in the modules 84-1 to 84-M included in the WXC function unit 221Da illustrated in FIG. 12, there are the following advantages by integrating a plurality of WSSs and optical couplers into one module. The WXC function unit 221Da illustrated in FIG. 12 can realize the same function with a smaller number of modules than the WXC function unit 221D illustrated in FIG. The WXC function unit 221Da illustrated in FIG. 12 can realize the same function as the WXC function unit 221D illustrated in FIG. 11 with the number of modules × two modules. Thus, the WXC function unit 221Da illustrated in FIG. 12 can reduce the number of components as compared to the WXC function unit 221D illustrated in FIG. 11, and the node configuration can be realized more simply.

  Next, a specific configuration example of a module (wavelength cross connect module) in which a plurality of WSSs shown in FIG. 11 are integrated will be described.

(Configuration Example 1 of Third Embodiment)
FIG. 13 is a diagram illustrating a configuration example 1 of a K-series (1 × K WSS) module 81-1 in which K 1 × K WSSs are integrated in the third embodiment. A K-series (1 × K WSS) module 81-1 illustrated in FIG. 13 illustrates a configuration example of a module in the case of K = 3.

  The K-series (1 × K WSS) module 81-1 includes light input units 101-1 to 101-3 which are collimators and the like, and light output units 102-11, 12, 13, 21, 22, 23 and 31 which are collimators and the like. , 32, and 33 (hereinafter, referred to as light output units 102-11 to 33), a diffraction grating 103, lenses 104-1 to 104-3, and a switch element 105. The diffraction grating 103 splits the WDM signals input from the light input units 101-1 to 3 by being diffracted and reflected at different angles depending on the wavelength, and is reflected by the switch element 105. The optical signals output to the light output units 102-11 to 102 are multiplexed. The lenses 104-1 to 3 transmit the optical signal demultiplexed by the diffraction grating 103 to a predetermined area of the switch element 105, and the optical signal whose deflection angle is controlled by the switch element 105 is determined to a predetermined value of the diffraction grating 103. To the area of

  The switch element 105 is composed of K switch elements 105-1 to 105-3, and the optical signal demultiplexed by the diffraction grating 103 is input to arbitrary light output units 102-11 to 33 for each wavelength. Control the beam deflection angle of the light signal. Specifically, the switch element 105-1 performs control to input the optical signal demultiplexed by the diffraction grating 103 to one of the optical output units 102-11 and 102-12 for each wavelength. Similarly, the switch element 105-2 performs control to input the optical signal demultiplexed by the diffraction grating 103 to any one of the optical output units 102-21 and 102-22 for each wavelength. The switch element 105-3 performs control to input the optical signal demultiplexed by the diffraction grating 103 to one of the optical output units 102-31 and 102-33 for each wavelength.

  For example, the 1 × K WSS 81-11 of FIG. 11 includes the light input unit 101-1 of FIG. 13, the light output units 102-11 and 102-12, the diffraction grating 103, the lens 104-1, and the switch element 105. And -1. Then, K 1 × K WSSs are vertically aligned and integrated. Each of the light input units 101-1 to 101-3 and the light output units 102-11 to 102 is, for example, a fiber collimator. The switch element 105 is made of, for example, LCOS (Liquid Crystal on Silicon).

  Next, a configuration of an optical system for integrating a plurality of WSSs into one module as in the K-series (1 × K WSS) module 81-1 shown in FIG. 13 will be described. The optical systems of the plurality of WSSs can be spatially separated by arranging the light input units 101-1 to 101-3 and the light output units 102-11 to 102 of the plurality of WSSs in the vertical direction in FIG. . At this time, in the optical input units 101-1 to 101-3 and the optical output units 102-11 to 102 corresponding to the input and output ports of each WSS, the incident optical signals are in the same area of the diffraction grating 103 and the switch element 105. It is arranged to be incident. The K-series (1 × K WSS) module 81-1 in FIG. 13 has a configuration in which one diffraction grating 103 and one switch element 105 are shared by a plurality of WSSs.

  In addition, although a K-series (1 × K WSS) module 81-1 in FIG. 13 illustrates a configuration example in which three 1 × 3 WSSs are integrated, the present invention is not limited to this. The configuration of FIG. 13 is also applicable to a configuration in which K pieces of K × M WSS in which the values of K and M are 2 or more are integrated. That is, by changing the arrangement and control method of a part of optical system members using the same optical system members as in FIG. 13, a module in which a plurality of M × N WSSs in which K and M are 2 or more are integrated is realized It is possible. That is, by applying the configuration of FIG. 13, the K-series (K × M WSS) modules 82-1 to M and the K-series (M × 1 WSS) module 83-1 shown in FIG. 11 can be realized.

(Configuration Example 2 of Third Embodiment)
Next, configuration example 2 of a module that integrates a plurality of M × N WSSs will be described.
FIG. 14 is a diagram illustrating a configuration example 2 of the K-series (1 × K WSS) module 81-1 in which K 1 × K WSSs are integrated in the third embodiment. A K-series (1 × K WSS) module 81-1 shown in FIG. 14 has a configuration using a planar lightwave circuit. A K-series (1 × K WSS) module 81-1 illustrated in FIG. 14 includes a light input / output unit 111, a diffraction grating 112, a lens 113, and a switch element 114. The light input / output unit 111 includes, for example, a planar lightwave circuit such as a silica-based planar lightwave circuit (PLC) that performs processing such as branching or coupling of optical signals. The light input / output unit 111 includes an input / output port 601 including a plurality of input / output waveguides, a plurality of slab waveguides 602 each connected to K input / output ports, and an arrayed waveguide 603. , And a slab waveguide 604. The plurality of slab waveguides 602 having the K input / output ports are formed of a planar lightwave circuit.

  The K-series (1 × K WSS) module 81-1 includes three slab waveguides 602. This indicates that the value of M + N in the M × N WSS constructed in the K-series (1 × K WSS) module 81-1 is three. That is, the K-series (1 × K WSS) module 81-1 includes M + N slab waveguides 602 when having a function corresponding to M × N WSS. Therefore, it can be said that the K-series (1 × K WSS) module 81-1 illustrated in FIG. 14 includes 1 × 2 WSS. An optical signal is input to one of the three waveguides 601-1 included in the input / output port 601, and an optical signal is output from two of them. Further, in each slab waveguide unit 602 shown in FIG. 14, two waveguides 601-1 and 601-2 are connected. This indicates the number of M × N WSSs constructed in the K-series (1 × K WSS) module 81-1. Therefore, it can be said that the K-series (1 × K WSS) module 81-1 illustrated in FIG. 14 includes two 1 × 2 WSSs.

  In the configuration shown in FIG. 14, three slab waveguides 602 are used in order to have one input port and two output ports, but in the configuration shown in FIG. Absent. For example, in a configuration having one or more input ports and one or more output ports, if the total number of input ports and output ports is K, then K slabs What is necessary is just to comprise by a waveguide part.

  In the slab waveguide unit 602 alone, the traveling direction of the optical signal output from the slab waveguide unit 602 is different for each optical signal input from each input port of the slab waveguide unit 602. The light input / output unit 111 can also integrate a plurality of slab waveguides 602. In FIG. 14, a plurality of slab waveguides 602 are integrated in one light input / output unit 111. In this case, in each slab waveguide unit 602, the optical signal input from the input port with the same port number is output in the same traveling direction at the output port of each slab waveguide unit 602. As a result, K pieces of M × N WSSs are configured by inputting optical signals input from the same M × N WSS input ports to the input ports of the same port number of each slab waveguide unit 602. The optical systems of the above can be configured separately.

  As shown in FIG. 14, by forming the slab waveguide portion 602 by a planar lightwave circuit having a plurality of input ports and output ports, it is possible to utilize the miniaturization technology of the planar lightwave circuit. That is, with the input / output port increased by the number of M × N WSSs included in the K-series (1 × K WSS) module 81-1, the device can be miniaturized and integrated.

Fourth Embodiment
An internal blocking in an optical network will be described. The WXC function units 221A to 221D described in FIGS. 3 to 11 shown as the first to third embodiments are connected between the vacant input / output ports even if the NNI input port and the NNI output port are vacant. There is a case that can not be done (this is called internal occlusion). For example, in the WXC function unit 221A shown in FIG. 5, an NNI input connected to the first input core (hereinafter referred to as input core 1) of the input route 301-1 as the first optical path first. The optical signal is connected from the port to the NNI output port connected to the first output core (hereinafter referred to as output core 1) of the output route 302-1. In this case, the optical signal is connected and set to pass through the K × K WSS 31 a-1 connected to the input core 1 and the M × M WSS 32 a-1 connected to the output core 1.

  In this state, as a second optical path, an output path 302-from an NNI input port connected to a second input core (hereinafter referred to as input core 2) of the input path 301-1. Consider the case where an optical signal is to be connected to the NNI output port connected to the first output core of 2 (hereinafter referred to as output core 2). In this case, for the connection of the optical signal, the optical signal can be passed through the K × K WSS 31a-2 connected to the input core 2 and the M × M WSS 32a-1 connected to the output core 2. There is a need to. However, the first light path has already passed through the K × K WSS 31a-1 and the M × M WSS 32a-1. For this reason, there is no vacancy in the route leading to the K × K WSS 31a-1 and the M × M WSS 32a-1. Therefore, in the second optical path, although the other NNI input port and the other NNI output port are open, a state occurs in which the optical path can not be set. This condition is called internal occlusion.

  FIG. 15 is a diagram showing a configuration example of the WXC function unit 221E in the fourth embodiment. The WXC function unit 221E in the fourth embodiment can avoid the internal blockage which is a problem in the WXC function units 221A to 221D described in FIGS. The WXC function unit 221E illustrated in FIG. 15 corresponds to a multi-core fiber with the number of routes M and the number of cores K, similarly to the WXC function unit 221A illustrated in FIG. In the components shown in FIG. 15, the same components as in FIG. 5 are assigned the same reference numerals, and the description will be simplified or omitted.

  As compared with the WXC function unit 221A shown in FIG. 5, the WXC function unit 221E shown in FIG. 15 has α cores (α is a natural number of 2 or more) between the core switching function unit 31b and the route switching function unit 32b. It differs in that it is connected by an optical fiber. The core switching function unit 31b of the WXC function unit 221E illustrated in FIG. 15 includes K × αK WSSs 31b-1 to 31-M that are the input port number K and the output port number αK. The route switching function unit 32 b includes αM × M WSSs 32 b-1 to K that are the input port number αM and the output port number M.

  Here, it will be described that the WXC function unit 221E shown in FIG. 15 can avoid the internal blockage. In the WXC function unit 221E shown in FIG. 15, it is assumed that the first optical path is connected from the first input core of the input route 301-1 to the first output core of the output route 302-1. A case where the second optical path is connected from the second core of the input route 301-1 to the first core 1 of the output route 302-2 in the WXC function unit 221 E shown in FIG. 15 is considered. In this case, both the first optical path and the second optical path are connected by passing through K × αK WSS 31b-1 of the same core switching function unit 31b and αM × M WSS 32b-1 of the route switching function unit 32b. Ru. In the WXC function unit 221A shown in FIG. 5, only one optical fiber is connected between the K × K WSS 31a-1 of the core switching function unit 31 and the M × M WSS 32a-1 of the route switching function unit 32. An internal occlusion has occurred. However, in the WXC function unit 221E shown in FIG. 15, the K × αK WSS 31b-1 of the core switching function unit 31b and the αM × M WSS 32b-1 of the route switching function unit 32b are connected by a plurality of optical fibers. The second light path can also be set. Thus, the WXC function unit 221E shown in FIG. 15 increases the number of output ports more than the number of WSS input ports in the core switching function unit 31b, and outputs the WSS in the route switching function unit 32b. Internal blockage can be avoided by increasing the number of input ports rather than the number of ports.

Fifth Embodiment
FIG. 16 is a diagram showing a configuration example of the WXC function unit 221F in the fifth embodiment. The WXC function unit 221F in the fifth embodiment can avoid the internal blockage which is a problem in the WXC function units 221A to 221D described in FIGS. The WXC function unit 221F illustrated in FIG. 16 corresponds to a multi-core fiber with the number of routes M and the number of cores K, similarly to the WXC function unit 221A illustrated in FIG. In the components shown in FIG. 16, the same components as those in FIG. 5 are denoted by the same reference numerals, and the description will be simplified or omitted.

  As compared with the WXC function unit 221A shown in FIG. 5, in the WXC function unit 221F shown in FIG. 16, a part of α optical fibers connecting between the core switching function unit 31c and the route switching function unit 32c is α (α The difference is that ≧ 2). The core switching function unit 31c of the WXC function unit 221F illustrated in FIG. 16 includes K × K ′ WSSs 31c-1 to M that are the number of input ports K and the number of output ports K ′. The route switching function unit 32 c includes M ′ × M WSSs 32 c-1 to K that are the input port number M ′ and the output port number M. Here, it is a relation of K <K '<αK and M <M' <αM. In FIG. 16, the Nth output port in the K × K ′ WSS 31 c-1 to M in the Nth core switching function unit 31 c and the Nth in M ′ × M WSS 32 c-1 to K in the route switching function unit 32 c. Connection to the input port of the network, but is not limited thereto. In the K × K ′ WSSs 31 c-1 to M, any number of output ports may be connected to any number of input ports in M ′ × M WSS 32 c-1 to K by α optical fibers.

  The WXC function unit 221F shown in FIG. 16 has the following effects. The WXC function unit 221F shown in FIG. 16 connects a part between the core switching function unit 31c and the route switching function unit 32c with α optical fibers as compared with the WXC function unit 221A shown in FIG. This reduces the incidence of internal occlusion. The WXC function unit 221F illustrated in FIG. 16 can reduce the number of WSS ports of the core switching function unit 31c and the WSS port of the route switching function unit 32c, as compared with the WXC function unit 221E illustrated in FIG. As described above, the WXC function unit 221F illustrated in FIG. 16 reduces internal blocking by connecting a part between the core switching function unit 31c and the route switching function unit 32c with a plurality of optical fibers, And, the increase in the number of ports of WSS can be suppressed.

Sixth Embodiment
FIG. 17 is a diagram showing a configuration example of the WXC function unit 221G in the sixth embodiment. The WXC function unit 221G in the sixth embodiment can avoid the internal blockage which is a problem in the WXC function units 221A to 221D described in FIGS. The WXC function unit 221G shown in FIG. 17 corresponds to a multi-core fiber with the number of routes M and the number of cores K, similarly to the WXC function unit 221A shown in FIG. In the components shown in FIG. 17, the same components as those in FIG. 5 are denoted by the same reference numerals, and the description will be simplified or omitted.

  The WXC function unit 221G shown in FIG. 17 differs from the WXC function unit 221A shown in FIG. 5 in the following three points. The number of WSSs of the path switching function unit 32d is α (α ≧ 1) more than the number (K) of cores. The core switching function unit 31d of the WXC function unit 221G includes K × K ′ WSSs 31d-1 to M with the number of input ports K and the number of output ports being K ′ (= K + α). Between the path switching function unit 32 d and the NNI output port, K ′ × K SEL 33 d-1 to M which selects K ports from K ′ ports and connects them to the NNI output port are provided.

  FIG. 18 is a diagram showing a configuration example of a selector of K ′ × K SEL33 d-1. As shown in FIG. 18, the K ′ × K SEL 33 d-1 includes 1 × K selectors 33 d-1 to 1 α and K (α + 1) × 1 selectors 33 d-21 to 2 K. K '× K SEL33d-2 to M have the same configuration as K' × K SEL33d-1 shown in FIG.

  The input ports of the 1 × K selectors 33 d-11 to 1 α are α pieces of input for connecting to the WSS added to the route switching function unit 32 d among the K ′ input ports in K ′ × K SEL 33 d −1 Connect with port Then, each output of the 1 × K selectors 33 d-11 to 1 α and each K input ports are selected by the (α + 1) × 1 selectors 33 d-21 to 2 K.

  The configuration shown in FIGS. 17 and 18 will explain that the WXC function unit 221G can avoid internal blockage. It is assumed that the first optical path is connected from the first input core of the input route 301-1 to the first output core of the output route 302-1. Further, consider the case where the second optical path is connected from the second input core of the input route 301-1 to the first output core of the output route 302-2. In this case, when setting the second optical path, with the configuration of the WXC function unit 221A shown in FIG. 5, internal blockage has occurred and could not be set. However, in the WXC function unit 221G shown in FIGS. 17 and 18, the second optical path is different from the M × M WSS 32d-1 of the route switching function unit 32d used at the time of setting the first optical path. By using the WSS 32 d-K ′, internal blockage can be avoided and set. Although the WXC function unit 221G shown in FIGS. 17 and 18 has a configuration in which the WSS of the route switching function unit 32d is increased, the present invention is not limited to this. For example, even if K × K ′ WSS of the core switching function unit 31 d is increased, the same effect can be obtained. Thus, the WXC function unit 221G shown in FIGS. 17 and 18 increases the WSS of the core switching function unit 31d by the number of routes or the WSS of the route switching function unit 32d by the number of cores. In addition, the internal occlusion can be reduced.

  In the first to sixth embodiments described above, an example in which a multi-core fiber is connected to the input / output port is shown, but the present invention is not limited to this. You may connect the multi fiber which bundled multiple single core fibers to the input-output port. For example, a configuration in which the multi-core fiber of the input route shown in FIG. 3 is replaced with a bundle of K single-core fibers (optical fibers for input) and the multi-core fiber of the output route are K single-core fibers (output Optical fiber) is replaced with a bundle of

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design and the like within the scope of the present invention.

  A wavelength cross-connect device and module according to the present invention are devices incorporated in an optical node in an optical network including an optical fiber and an optical node connected between the optical fibers, and the optical network includes It is suitable as an apparatus for controlling the transmission destination of multiplexed optical signals such as WDM signals to be transmitted.

DESCRIPTION OF SYMBOLS 1 ... Optical network, 2 ... Optical cross connect apparatus, 3 ... Optical fiber (multi-core fiber), 9 ... Client apparatus, 21-1-21-M, 23-1-23-M .. · · NNI function unit, 22 · · · optical switch function unit, 221, 221A ~ 221G · · · WXC function unit, 222 · · · Add / Drop function unit, 24 · · · UNI function unit, 301-301 -M: Input route, 302-1 to 302-M: Output route, 301-11 to 301-MK: Input core, 302-11 to 302-MK: Output core

Claims (9)

M1 (M1 is a natural number of 2 or more) input routes composed of K (K is a natural number of 2 or more) input cores or K input optical fibers and K output cores Provided in an optical cross-connect apparatus in which M2 (M2 is a natural number of 2 or more) output routes comprising an optical fiber having K or K output optical fibers are connected, and an input is made from the input route A wavelength cross connect apparatus for processing a first multiplexed optical signal in which optical signals of a plurality of wavelengths are multiplexed;
There are K provided corresponding to each of the input cores or the input optical fibers, and M1 first input ports connected to each of the input routes and M2 first corresponding to each of the output routes The first multiplexed optical signal input to the first input port is split into first optical signals by wavelength, and each of the first optical signals after splitting is separated. A first route switching switch that switches the first output port according to the wavelength and the input core or the input optical fiber, and outputs a second multiplexed optical signal;
There are M second input ports provided corresponding to each of the output routes, and K corresponding to the K second input ports connected to each of the first route switches and each of the output cores or the output optical fibers. , And the second multiplexed optical signal input from the first path switching switch is split into second optical signals by wavelength, and A first core switching switch that switches the second output port according to each wavelength of the second optical signal and each output route, and outputs a third multiplexed optical signal;
A first configuration, or
M1 are provided corresponding to each of the input routes, and correspond to K second input ports connected to each of the input cores or the input optical fibers, and each of the output cores or the output optical fibers The first multiplexed optical signal having K second output ports, which is input from the input route, is demultiplexed into first optical signals of different wavelengths, and the demultiplexed first light is generated. A second core switching switch that switches the second output port according to each wavelength of the signal and each input route, and outputs a fourth multiplexed optical signal;
There are K provided corresponding to each of the output cores or the output optical fibers, and M1 first input ports connected to each of the second core changeover switches and M2 corresponding to each of the output routes The fourth multiplexed optical signal input from the second core switching switch is split into third optical signals by wavelength, and the third split optical signal is split. A second route switching switch that switches the first output port according to each wavelength of the optical signal and each output core or each output optical fiber, and outputs a third multiplexed optical signal;
A wavelength cross connect apparatus comprising any one of the configurations of the second configuration comprising:   The first wavelength selection switch according to claim 1, wherein the first core switching switch or the second core switching switch is a first wavelength selective switch having K second input ports and K second output ports. The wavelength cross connect apparatus as described. The first wavelength changeover switch or the second path changeover switch is a second wavelength selective switch having M1 first input ports and M2 first output ports. The wavelength cross connect apparatus according to 1 or 2 . The first wavelength selective switch includes K 1-input K-output wavelength selective switches and K K-input 1-output wavelength selective switches, or K 1-input K-output wavelength selection It is composed of a switch and K K-input one-output optical couplers, or K K one-input K-output optical couplers and K K-input one-output wavelength selective switches. Item 2. The wavelength cross connect device according to item 2. The second wavelength selective switch includes M1 1-input M2-output wavelength selective switches and M2 M1-input 1-output wavelength selective switches, or M1 1-input M2 outputs wavelength-selective It consists of a switch and M2 M1 input 1 output optical couplers, or M1 1 input M2 output optical couplers and M2 M1 input 1 output wavelength selective switches Item 3. The wavelength cross connect device according to item 3. M1 (M1 is a natural number of 2 or more) input routes composed of K (K is a natural number of 2 or more) input cores or K input optical fibers and K output cores Provided in an optical cross-connect apparatus in which M2 (M2 is a natural number of 2 or more) output routes comprising an optical fiber having K or K output optical fibers are connected, and an input is made from the input route A wavelength cross connect apparatus for processing a first multiplexed optical signal in which optical signals of a plurality of wavelengths are multiplexed;
There are M first input ports provided corresponding to each of the input routes, and K first input ports connected to each of the input cores or the input optical fiber and each of the output routes and each of the output cores or outputs An optical path switch having (K × M2) first output ports corresponding to the optical fiber;
M2 are provided corresponding to each of the output routes, and (K × M1) second input ports connected to each of the route changeover switches and each of the output cores or the output optical fiber A core changeover switch having K second output ports;
Equipped with
The route changeover switch is composed of K 1-input M2-output wavelength selective switches, and the core changeover switch is K M1-input K-output wavelength selective switches and K K-input 1-output wavelengths Configured by selection switch, or
The route changeover switch is composed of K 1-input M2-output wavelength selective switches, and the core changeover switch is K M1-input K-output optical couplers and K K-input 1-output wavelengths selected Configured by a switch, or
The route changeover switch is composed of K 1-input M2-output optical couplers, and the core changeover switch is K M1-input K-output wavelength selective switches and K K-input 1-output optical couplers Composed of
Wavelength cross connect device. M1 (M1 is a natural number of 2 or more) input routes composed of K (K is a natural number of 2 or more) input cores or K input optical fibers and K output cores Provided in an optical cross-connect apparatus in which M2 (M2 is a natural number of 2 or more) output routes comprising an optical fiber having K or K output optical fibers are connected, and an input is made from the input route A wavelength cross connect apparatus for processing a first multiplexed optical signal in which optical signals of a plurality of wavelengths are multiplexed;
There are M second input ports provided corresponding to each of the input routes and connected to each of the input cores or the input optical fiber, and each of the output routes and each of the output cores or outputs A core changeover switch having (K × M2) second output ports corresponding to the optical fiber for the optical fiber;
(M × 2) corresponding to each of the output routes, and (K × M1) first input ports connected to each of the core changeover switches, and K corresponding to each of the output cores or the output optical fibers A directional changeover switch having a plurality of first output ports,
Equipped with
The core changeover switch is composed of K 1-input K-output wavelength selective switches and K K-input M2 output wavelength-selective switches, and the route changeover switch is K M1 input 1-output wavelengths Configured by selection switch, or
The core changeover switch is composed of K 1-input K-output wavelength selective switches and K K-input M2 output optical couplers, and the route changeover switch is K M1 input 1-output wavelength selection Configured by a switch, or
The core switching switch is composed of K 1-input K-output optical couplers and K K-input M2 output wavelength selective switches, and the route switching switch is K M1-input 1-output optical couplers Composed of
Wavelength cross connect device.   In the first route switching switch, the number of the first output ports is M1 + N (N is a natural number of 1 or more) while the number of the first input ports is M1 or the second The wavelength cross connect device according to claim 1, wherein the number of the second output ports is K + N (N is a natural number of 1 or more) while keeping the number of the second input ports K in the core switching switch.   Connect a part or all of the connections between each of the first route changeover switches and each of the first core changeover switches by α number (α is a natural number of 2 or more) of optical fibers, or The wavelength according to claim 1, wherein a part or all of the connection between the second core changeover switch and each of the second route changeover switches is connected by α (α is a natural number of 2 or more) optical fibers Cross connect device.

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