JP5622197B2 - Hierarchical optical path cross-connect equipment for optical path networks - Google Patents

Description

  The present invention relates to a hierarchical optical path cross-connect device that functions as a relay node of an optical path network.

  In a hierarchical optical path network, wavelength division multiplexing (WDM) in which light of a plurality of wavelengths respectively corresponding to a plurality of wavelength channels (wave channels or light paths) divided every 100 GHz of a predetermined communication wavelength band is combined. : Wavelength Division Multiplexing), that is, a plurality of wavelengths are transmitted in parallel via a plurality of optical fibers. In each relay node of the optical path network, the wavelength group transmitted by an optical fiber or the like is switched as it is to an optical fiber in a predetermined transmission direction, and the wavelengths (channels) included in the wavelength group are separated as necessary. The recombined wavelength group is switched to an optical fiber in a predetermined transmission direction. The optical path cross-connect device disclosed in Patent Document 1 is an example.

  In recent years, a plurality of wavelength groups or wavelengths input from a plurality of transmission lines on the input side are transmitted in a predetermined transmission path on the output side in the optical path cross-connect device that constitutes the relay node due to an increase in communication capacity. Matrix used for route switching to route directly to the path, or switching for adding (adding) a plurality of input wavelength groups or wavelengths to other wavelength groups by dropping a part of the wavelengths. The scale of optical switches is increasing, and it is required to reduce the scale of the matrix optical switch as much as possible from the viewpoint of the scale and price of the apparatus.

JP 2008-252664 A

  By the way, as shown in FIG. 24, for example, K wavelength division multiplexed lights are respectively input via K input optical fibers, and each of the wavelength division multiplexed lights is configured in a band (wavelength group) path cross-connect section. Wavelength group path cross-connect unit BXC for switching the route in units of wavelength groups and routing the multiplexed wavelength division multiplexed light to K output side optical fibers, and the wavelength group dropped from the wavelength group path cross-connect unit A wavelength path cross-connect unit WXC for switching the path in units of wavelengths by demultiplexing the wavelength group into the wavelength and joining the combined wavelength group to the wavelength group path cross-connect unit BXC, a router, etc. The wavelength path cross-connect unit is connected to an electrical layer (electrical level) EL for performing signal conversion between an electrical signal and an optical signal in wavelength units. A hierarchical optical path cross-connect device including an optical signal termination processing unit for dropping an add wavelength output from the electrical layer to the wavelength path cross-connect unit WXC. It has been proposed to be used as a relay node.

  However, in order to build a dynamic network that can adaptively respond to traffic fluctuations, such a relay node allows any receiver in the electrical layer to receive optical signals of any wavelength from all network ports. A so-called colorless function that enables any transmitter in the electrical layer to transmit an optical signal of any wavelength to all network ports, and any receiver in the electrical layer A so-called directionless function that allows an optical signal to be received from an arbitrary fiber to a network port, or allows an arbitrary transmitter in an electrical layer to transmit an optical signal to an arbitrary fiber to all network ports. It is important to have For this reason, in order for the optical signal termination processing unit to generate these functions, the drop wavelength that is the terminated optical signal needs to be output in the order according to the wavelength according to a predetermined rule. A relatively large-scale matrix optical switch that can recombine the wavelength arbitrarily so that the add wavelength, which is the start-end optical signal, is also output in the order according to the destination according to a predetermined rule. There is a drawback that it is necessary between the cross-connect unit WXC.

  Further, as an unknown structure, as shown in FIGS. 25 and 26, grooming (re-establishment) to the wavelength path cross-connect unit WXC via the matrix optical switch or the wavelength group selection switch WBSS in the wavelength group path cross-connect unit BXC. Rather than transferring the wavelength group for termination processing or the wavelength group for termination processing or transferring the added wavelength group in the reverse direction, separate from the matrix optical switch in the wavelength group path cross-connect unit BXC It has been proposed to transfer a wavelength group for grooming (wavelength group recombination) or termination processing or transfer an added wavelength group in the reverse direction using a provided matrix optical switch. However, even in such a hierarchical optical path cross-connect device, the size of the matrix optical switch and the wavelength group selection switch WBSS in the wavelength group path cross-connect unit BXC is reduced, but the wavelength path and grooming that are terminated at the relay node are reduced. Since the wavelength path to be processed is transferred by the optical switch of the wavelength path cross-connect unit WXC, it is not possible to limit each termination processing function or wavelength grooming process, and the switch scale of the entire apparatus is large. There was still room for improvement.

  The present invention has been made against the background of the above circumstances, and its object is to provide a hierarchical optical path cross-connect device for an optical path network that can further reduce the scale of a matrix optical switch as a whole device. Is to provide.

  Based on the above situation, the present inventors have repeatedly considered that an optical switch for transferring a wavelength group for termination processing is independently provided between the input / output optical fiber and the termination processing unit. Wavelength group grooming for transferring wavelength group termination add / drop rate z related to processing between wavelength group path cross-connect unit BXC and wavelength path cross-connect unit WXC If the add / drop rate y for the wavelength grooming process is smaller than the add / drop rate z for the termination process, it can be set independently of the add / drop ratio y for the termination process. In particular, it has been found that the scale of the matrix optical switch provided in the termination processing unit is significantly reduced. The present invention has been made based on such findings.

That is, the gist of the invention according to claim 1 is that (1) a plurality of wavelength division multiplexed lights respectively transmitted through a plurality of input-side optical fibers are demultiplexed into wavelength groups respectively included; Wavelength group path cross-connect unit for switching the path of new wavelength division multiplexed light recombined in units of wavelength groups and transmitting from the output side optical fiber, and preset grooming add / drop from the wavelength group path cross-connect unit The wavelength group path cross-connect receives a wavelength group dropped at a rate below the wavelength group, demultiplexes the wavelength group into wavelengths included in the wavelength group, and incorporates the new wavelength group recombined in the wavelength unit into the wavelength division multiplexed light A wavelength path cross-connect unit to be transmitted to a unit and a wavelength path cross-connect unit included in any of a plurality of wavelength groups constituting the plurality of wavelength division multiplexed light transmitted through the input side optical fiber. A drop-side optical signal termination processing unit that selects the output wavelength and outputs it to the electrical layer, and adds the add wavelength input from the electrical layer to any of the plurality of wavelength groups included in the plurality of wavelength division multiplexed lights An optical path network hierarchical optical path cross-connect device comprising: an add-side optical signal termination processing unit to be transmitted from the output-side optical fiber, and (2) a wavelength transmitted by the plurality of input-side optical fibers A wavelength group that constitutes a wavelength division multiplexed light that is provided between the path of the division multiplexed light or the wavelength group path demultiplexed therefrom and the drop side optical signal termination processing unit and transmitted through the input side optical fiber a range of preset terminating add-drop rate the wavelength path drop-side optical scan output to the drop-side optical signal termination unit independent of the transfer path to the cross-connect unit And / or a wavelength division multiplexed light path corresponding to the plurality of output side optical fibers or a wavelength group path combined therewith, and the add side optical signal termination processing unit. The wavelength group transferred from the side optical signal termination processing unit is joined to the plurality of output side optical fibers independently of the joining path from the wavelength path cross-connect unit within a preset range of termination drop rate. An add-side optical switch mechanism, and the grooming add-drop rate and the termination add-drop rate can be set independently of each other .

According to a second aspect of the present invention, in the first aspect, the drop-side optical switch mechanism transmits a plurality of wavelength groups demultiplexed for each of the plurality of input-side optical fibers in parallel. to provided to the wavelength group path, a plurality of optical switches respectively output the number of wavelength groups was limited by the preset terminating add-drop rate of the wavelength groups of the plurality of to the drop-side optical signal termination unit , To include.

According to a third aspect of the present invention, in the first aspect, the drop-side optical switch mechanism transmits a plurality of wavelength groups demultiplexed for each of the plurality of input-side optical fibers in parallel. to provided to the wavelength group path, an optical switch for outputting the wavelength group of the plurality of the number of wavelength groups was limited by the preset terminating add-drop rate of the plurality wavelength groups output from the light switches And a wavelength group number limiting unit that outputs the signal to the drop-side optical signal termination processing unit.

According to a fourth aspect of the present invention, in the first aspect, the drop-side optical switch mechanism is provided for each of the plurality of input-side optical fibers and transmitted by the plurality of input-side optical fibers. a plurality of said wavelength group selecting switch output the number of wavelength groups restricted with preset terminating add-drop rate to the drop-side optical signal termination unit of the wavelength group constituting the wavelength division multiplexed light has , To include.

  The gist of the invention according to claim 5 is that, in claim 2, the drop-side optical signal termination processing unit receives the wavelength group output from the drop-side optical switch mechanism and converts the wavelength group into a wavelength. A plurality of wavelength demultiplexers each demultiplexing in units, and a plurality of wavelength demultiplexers and a plurality of receivers provided in the electrical layer, are demultiplexed by the wavelength demultiplexer And a single matrix optical switch that outputs a wavelength to any one of the plurality of receivers.

  According to a sixth aspect of the present invention, in the second aspect, the drop-side optical signal termination processing unit receives the wavelength group output from the drop-side optical switch mechanism and converts the wavelength group into a wavelength. A plurality of wavelength demultiplexers each demultiplexing in units, and a plurality of wavelength demultiplexers and a plurality of receivers provided in the electrical layer, are demultiplexed by the wavelength demultiplexer And a matrix optical switch having a three-stage configuration for outputting a wavelength to any one of the plurality of receivers.

  According to a seventh aspect of the present invention, in the second aspect, the drop-side optical signal termination processing unit receives the wavelength group separated by the drop-side optical switch mechanism and branches the wavelength group. Receiving the same number of optical couplers as the number of wavelength groups, and receiving all of the plurality of wavelength groups branched from the plurality of optical couplers, and selecting one wavelength group from the plurality of wavelength groups; And the same number of matrix optical switches that output to any one of a plurality of receivers having a coherent reception function provided in the layer.

  The gist of the invention according to claim 8 is that, in claim 3, the wavelength group number limiting unit receives the wavelength group separated by the drop side optical switch mechanism and branches. The same number of couplers and wavelength groups branched from the couplers are selected, and one wavelength group is selected from the plurality of wavelength groups, and is output to the drop side optical signal termination processing unit. It is to include the same number of matrix optical switches as the number of wavelength groups output to the optical signal termination processing unit.

According to the hierarchical optical path cross-connect device of the invention according to claim 1, the wavelength division multiplexed light path transmitted by the plurality of input side optical fibers or the wavelength group path demultiplexed therefrom and the drop side optical signal The wavelength path cross-connect is provided within a predetermined range of termination add / drop rates within a wavelength group that constitutes the wavelength division multiplexed light that is provided between the termination processing unit and transmitted via the input side optical fiber. A drop-side optical switch mechanism that outputs to the drop-side optical signal termination processing unit independently of the transfer path to the unit, and / or a wavelength-division-multiplexed light path corresponding to the plurality of output-side optical fibers, or a combination thereof to provided between the wavelength group path the add-side optical signal termination unit, the wavelength group transferred from the add-side optical signal termination unit, a preset terminating add-drop rate In enclosed, since add-side optical switch mechanism and the subscriber path from the wavelength path cross-connect unit to join to said plurality of output optical fibers independently are provided, simple optical switch mechanism for sending to the terminating device Therefore, the scale of the switch mechanism in the wavelength path cross-connect unit can be easily reduced. Also, the termination drop rate ( add / drop ratio z ) of the wavelength group transferred in relation to termination processing is related to the wavelength grooming processing between the wavelength group path cross-connect unit BXC and the wavelength path cross-connect unit WXC. Therefore, the scale of the matrix optical switch provided in the optical signal termination processing unit can be greatly reduced since it can be set independently of the grooming add / drop rate ( add / drop rate y ) of the wavelength group to be transferred.

According to the hierarchical optical path cross-connect device of the invention according to claim 2, the drop-side optical switch mechanism transmits a plurality of wavelength groups demultiplexed for each of the plurality of input-side optical fibers in parallel. A plurality of optical switches, each of which is provided in a wavelength group path, and outputs a number of wavelength groups of the plurality of wavelength groups limited by the preset termination drop rate to the drop-side optical signal termination processing unit. Therefore, the wavelength group path cross-connect unit BXC and the wavelength path cross-connect unit include the add / drop rate for termination ( add / drop rate z ) of the wavelength group transferred in association with the termination process by the plurality of optical switches. Since it can be set independently of the grooming add / drop rate ( add / drop rate y ) of the wavelength group transferred to and from the WXC in connection with the wavelength grooming process, The scale of the matrix optical switch provided in the signal termination processing unit is significantly reduced.

According to the hierarchical optical path cross-connect device of the invention of claim 3, the drop side optical switch mechanism transmits a plurality of wavelength groups demultiplexed for each of the plurality of input side optical fibers in parallel. to provided to the wavelength group path, an optical switch for outputting the wavelength group of the plurality, the number of wavelength groups was limited by the preset terminating add-drop rate of the plurality wavelength groups output from the light switch Wavelength group number limiting unit for outputting to the drop-side optical signal termination processing unit, respectively, the wavelength group number limiting unit uses the wavelength group number limiting unit to terminate the wavelength group to be transferred in association with termination processing ( add / the drop rate z), Adodo grooming of wavelength groups to be transferred in relation to the wavelength grooming process between the wavelength group path cross-connect unit BXC and the wavelength path cross-connect unit WXC Can be set independently of the-up rate (the add / drop ratio y), scale matrix optical switch provided in the optical signal termination section becomes smaller considerably.

According to the hierarchical optical path cross-connect device of the invention according to claim 4, the drop side optical switch mechanism is provided for each of the plurality of input side optical fibers, and is transmitted by the plurality of input side optical fibers. a plurality of said wavelength group selecting switch output the number of wavelength groups restricted with preset terminating add-drop rate to the drop-side optical signal termination unit of the wavelength group constituting the wavelength division multiplexed light has Therefore, by using the wavelength group selection switch, the wavelength group path cross-connect unit BXC and the wavelength path cross-connect unit are used to determine the termination add / drop rate ( add / drop rate z ) of the wavelength group transferred in association with termination processing. It is set independently of the add / drop rate ( add / drop rate y ) for the grooming of the wavelength group transferred with the WXC in connection with the wavelength grooming process. Therefore, the scale of the matrix optical switch provided in the optical signal termination processing unit is greatly reduced.

  According to the hierarchical optical path cross-connect device of the invention according to claim 5, the drop-side optical signal termination processing unit receives the wavelength group output from the drop-side optical switch mechanism and converts the wavelength group into a wavelength. A plurality of wavelength demultiplexers each demultiplexing in units, and a plurality of wavelength demultiplexers and a plurality of receivers provided in the electrical layer, are demultiplexed by the wavelength demultiplexer Since it includes a single matrix optical switch that outputs a wavelength to any one of the plurality of receivers, it is possible to provide a so-called colorless function and a directionless function. .

  According to the hierarchical optical path cross-connect device of the invention according to claim 6, the drop-side optical signal termination processing unit receives the wavelength group output from the drop-side optical switch mechanism and converts the wavelength group into a wavelength. A plurality of wavelength demultiplexers each demultiplexing in units, and a plurality of wavelength demultiplexers and a plurality of receivers provided in the electrical layer, are demultiplexed by the wavelength demultiplexer Since it includes a three-stage matrix optical switch that outputs a wavelength to any one of the plurality of receivers, it is possible to provide a so-called colorless function and a directionless function. Become.

  According to the hierarchical optical path cross-connect device of the invention of claim 7, the drop-side optical signal termination processing unit receives the wavelength group separated by the drop-side optical switch mechanism and branches the wavelength group Receiving the same number of optical couplers as the number of wavelength groups, and receiving all of the plurality of wavelength groups branched from the plurality of optical couplers, and selecting one wavelength group from the plurality of wavelength groups; Since it includes the same number of matrix optical switches as the receiver that outputs to any one of a plurality of receivers having a coherent reception function provided in the layer, the so-called colorless function and directionless (Directionless) function can be provided.

  According to the hierarchical optical path cross-connect device of the invention according to claim 8, the wavelength group number limiting unit receives the wavelength group separated by the drop side optical switch mechanism and branches. The same number of couplers and wavelength groups branched from the couplers are selected, and one wavelength group is selected from the plurality of wavelength groups, and is output to the drop side optical signal termination processing unit. Since the same number of matrix optical switches as the number of wavelength groups output to the optical signal termination processing unit are included, the wavelength group termination limit add / drop by the wavelength group number limiting unit is transferred in association with termination processing. Wavelength group grooming add / drop rate for transferring the rate z in association with the wavelength grooming process between the wavelength group path cross-connect unit BXC and the wavelength path cross-connect unit WXC Can be set independently of the scale of the matrix optical switch provided in the optical signal termination section becomes smaller considerably.

It is a conceptual diagram for demonstrating the principal part structure of the relay node of the optical path network containing the optical signal termination | terminus apparatus of one Example of this invention. It is a figure explaining the structure of the termination process part and origin process part which were provided in the optical path cross-connect apparatus of FIG. It is a figure explaining the structure and function of a matrix optical switch used for the optical path cross-connect apparatus of FIG. It is a figure explaining the structure and function of the optical coupler used for the optical path cross-connect apparatus of FIG. It is a figure explaining the structure and function of the optical coupler used in the optical path cross-connect apparatus of FIG. It is a figure explaining the demultiplexing operation | movement of the duplexer comprised from the array type | mold waveguide grating | lattice AWG used in the optical path cross-connect apparatus of FIG. It is a figure explaining the wavelength selection operation | movement of the wavelength selective switch used in the optical path cross-connect apparatus of FIG. It is a figure explaining the wavelength group selection operation | movement of the wavelength group selection switch used in the optical path cross-connect apparatus of FIG. It is a figure explaining the structure of the hierarchical type optical path cross-connect apparatus of the other Example of this invention. It is a figure explaining the structure of the hierarchical type optical path cross-connect apparatus of the other Example of this invention. It is a figure explaining the structure of the hierarchical type optical path cross-connect apparatus of the other Example of this invention. It is a figure explaining the other structure of the termination process part and origin process part with which the hierarchical optical path cross-connect apparatus of the Example of FIG. 1, FIG. 9-11 is equipped. It is a figure explaining the other structure of the termination process part with which a hierarchical type optical path cross-connect apparatus is equipped. It is a figure explaining the other structure of the origin processing part with which a hierarchical type optical path cross-connect apparatus is equipped. It is a figure explaining the structure of the hierarchical type optical path cross-connect apparatus of the other Example of this invention. FIG. 16 is a diagram illustrating another configuration of the termination rate control unit and the origination rate control unit provided in the hierarchical optical path cross-connect device of the example of FIG. 15. It is a figure explaining the structure of the hierarchical type optical path cross-connect apparatus of the other Example of this invention. It is a figure explaining the other structure of the termination rate control part with which the hierarchical type optical path cross-connect apparatus of the Example of FIG. 17 is provided, and an origination rate control part. It is a figure explaining the structure of the hierarchical type optical path cross-connect apparatus of the other Example of this invention. It is a figure explaining the structure of the hierarchical type optical path cross-connect apparatus of the other Example of this invention. It is a figure explaining the structure of the hierarchical type optical path cross-connect apparatus of the other Example of this invention. It is a figure which shows the switch scale of the hierarchical optical path cross-connect apparatus of this invention in contrast with the conventional hierarchical optical path cross-connect apparatus. In the hierarchical optical path cross-connect device of the present invention, it is a diagram showing the change of the switch scale in the termination processing unit or origination processing unit when the termination add / drop ratio z is changed. It is a figure explaining the structure of the conventional hierarchical type optical path cross-connect apparatus. It is a figure explaining the structure of the conventional hierarchical type optical path cross-connect apparatus. It is a figure explaining the structure of the conventional hierarchical type optical path cross-connect apparatus.

  FIG. 1 shows an outline of the configuration of a relay node RN of an optical path network connected in a network by an optical fiber bundle composed of a plurality of, for example, K optical fibers F1 to FK. This relay node RN is provided between K input side optical fibers Fi1, Fi2,... FiK that function as wavelength group paths and K output side optical fibers Fo1, Fo2,. The optical path cross-connect device OXC and a termination processing unit TA and an origination processing unit TB functioning as an optical signal termination device are provided.

  In this embodiment, N wavelengths of light respectively corresponding to a plurality of wavelength channels (wave channels or light paths) divided every 100 GHz in a predetermined communication wavelength band, for example, are combined into one wavelength. A group WB is configured, and M (M sets) wavelength groups WB are combined to form one wavelength division multiplexing (WDM) light, and the wavelength division multiplexed light is provided for each optical fiber. Is transmitted. That is, WB11 to WB1M, WB21 to WB2M,... WBK1 to WBKM are input in parallel through input side optical fibers Fi1, Fi2,. The groups WB11 to WB1M, WB21 to WB2M,... WBK1 to WBKM are output in parallel via output side optical fibers Fo1, Fo2,. The above K, M, and N are integers.

  Here, for example, the wavelengths of the wavelength channels included in the wavelength group B11 are λ111 to λ11N, the wavelengths of the wavelength channels included in the wavelength group B12 are λ121 to λ12N, and the wavelengths of the wavelength channels included in the wavelength group B1M are λ1M1 to λ1MN The wavelengths of the wavelength channels included in the group BKM are λKM1 to λKMN, but these wavelengths, for example, λ121 to λ12N, may increase sequentially one after another or may be dispersive. Good.

  The optical path cross-connect device OXC is, for example, a hierarchical optical path cross-connect device that performs routing (route switching) in units of wavelength groups at the wavelength group level WBL and performs routing (route switching) in units of wavelengths at the wavelength level WLL. . This optical path cross-connect device OXC includes wavelength division multiplexed light, that is, wavelength groups WB11 to WB1M, WB21 of K groups (K sets) respectively input through K input side optical fibers Fi1, Fi2,. ~ WB2M, ... K 1xM wavelength group demultiplexers AB1 ~ ABK demultiplexing WBK1 ~ WBKM in units of wavelength groups, and wavelength groups demultiplexed by the wavelength group demultiplexers AB1 ~ ABK Drop side common to M K × zKM outputs for transferring a wavelength group to a termination (drop) processing unit TA at a preset add / drop rate z (0 to 1) provided in a path. Wave groups WB11 to WB1M, WB21 of the K groups (K sets) constituting the wavelength division multiplexed light respectively input through the optical switch mechanism SWA and the K input side optical fibers Fi1, Fi2,. ~ WB2M, ... WBK1 ~ WBK M is routed in units of wavelength groups, and one set is output to each of the K output side optical fibers Fo1, Fo2,... FoK, and wavelength groups WB11 to WB1M, WB21 to the input K groups are output. WB2M,... Wavelength group path for dropping a drop wavelength group to the wavelength path cross-connect unit WXC at a predetermined number of WBK1 to WBKM, that is, a preset grooming add / drop ratio y (arbitrary number of 0 to 1) The cross-connect unit BXC and a plurality of wavelengths constituting a predetermined ratio of wavelength groups dropped at a preset grooming drop / add rate y (an arbitrary number of 0 to 1) are routed in units of wavelengths and predetermined. The wavelength path cross-connect unit WXC that configures and outputs a percentage of the added wavelength group and the wavelength group path cross-connect unit BXC route-switches K lines Of the K group for outputting one set to each of the output optical fibers Fo1, Fo2,... FoK and the added wavelength group recombined by the wavelength path cross-connect unit WXC. Output wavelength optical fibers Fo1, Fo2,..., FoK, respectively, between the K wavelength group multiplexers BB1 to BBK and the wavelength group multiplexers BB1 to BBK and the wavelength group path cross-connect section BXC. M which joins one of the wavelength-division multiplexed lights with the added wavelength group added from the origination (add) processing unit TB at a preset termination add / drop rate z (any number from 0 to 1). And an add-side optical switch mechanism SWB common to zKM × K inputs. The connection part between the drop-side optical switch mechanism SWA and the termination processing unit TA has input ports to which wavelength groups output from M K × zKM optical switches are respectively input. You may comprise with the wavelength demultiplexer which demultiplexes to the wavelength which comprises each wavelength group, and outputs the wavelength from the output port of the same predetermined position irrespective of a wavelength group. Similarly, the connection part between the add-side optical switch mechanism SWB and the origination processing unit TB has input ports to which wavelengths belonging to different wavelength groups are input at the same predetermined positions, and the wavelengths are different from each other. A wavelength multiplexer that outputs from a different output port for each group may be configured by inputting the wavelength groups output from the wavelength multiplexer to M zKM × K optical switches.

  The wavelength group path cross-connect unit BXC routes the wavelength groups WB11 to WB1M, WB21 to WB2M,... WBK1 to WBKM of the K groups (K sets) constituting the input wavelength division multiplexed light in units of wavelength groups. , And M K × K matrix optical switches BMS1 to BMSK that output one set to each of the K output-side optical fibers Fo1, Fo2,... FoK, and the wavelength groups WB11 to WB11 to the input K groups. WB1M, WB21 to WB2M,... Drop wavelength group to wavelength path cross-connect unit WXC at a predetermined number of WBK1 to WBKM, that is, a preset grooming add / drop ratio y (arbitrary number of 0 to 1) Wavelength grooming optical switch WGSWD composed of M K × yKM optical switches to be added, and groomed add wavelength group from wavelength path cross-connect unit WXC And an optical switch WGSWA to join a wavelength group whose wavelength grooming of M YKM × K optical switches for sending to one of the fibers. The y is a preset grooming add / drop ratio (an arbitrary number from 0 to 1) of a wavelength group to be dropped or added between the wavelength group path cross-connect unit BXC and the wavelength path cross-connect unit WXC.

  The wavelength path cross-connect unit WXC is demultiplexed by wavelength demultiplexers AW1 to AWyKM that demultiplex each of yKM wavelength groups dropped from the wavelength group path cross-connect unit BXC into wavelengths constituting them. M yKM × yKM matrix optical switches WMS for recombination of wavelengths, and yKM yKM × 1 wavelength multiplexers for combining the wavelengths output from those yKM × yKM matrix optical switches WMS into wavelength groups BW1 to BWyKM are provided, and the combined add wavelength group is transferred to the yKM × K optical switch.

  The termination processing unit TA and the origination processing unit TB are configured such that a pre-designated drop wavelength included in the transmitted wavelength division multiplexed light is provided between the electrical signal and the wavelength unit optical signal by providing a router or the like. Output to an arbitrary receiver in the electric layer EL for optical / electrical signal conversion, or join a predetermined add wavelength output from a predetermined transmitter in the electric layer to a specified arbitrary wavelength group It functions as an optical signal termination device. The termination processing unit TA and the origination processing unit TB are similarly configured by optical functional parts capable of reversible operation, for example, as shown in FIG.

  In FIG. 2, the termination processing unit TA includes zKM wavelength demultiplexers WB for demultiplexing the zKM wavelength groups transferred from the drop-side switch mechanism SWA into a plurality of wavelengths respectively constituting the wavelength group, and zKM An electrical layer EL including a zKMN × zKMN matrix optical switch for selecting a pre-designated drop wavelength among zKMN wavelengths demultiplexed by each of the wavelength demultiplexers WB, and including the drop wavelength in a router or the like Are input to a designated one of the zKMN receivers (for example, photosensor diodes) PD provided in FIG. The origination processing unit TB receives an add wavelength output from a designated one of zKMN transmitters (for example, light emitting diodes) provided in the electrical layer EL, and joins a previously designated wavelength group × ZKMN × A zKMN matrix optical switch and zKM wavelength multiplexers WG that combine the add wavelengths output from the zKMN × zKMN matrix optical switch into a predetermined wavelength group are transmitted to the add-side switch mechanism SWB.

  The drop-side optical switch mechanism SWA is provided independently of the wavelength group path optical switch WGSWD of the wavelength group path cross-connect unit BXC in the wavelength group path demultiplexed by the wavelength group demultiplexers AB1 to ABK. In addition to the drop wavelength group transfer from the wavelength grooming optical switch WGSWD to the wavelength path cross-connect unit WXC, the drop wavelength group transfer to the termination processing unit TA is performed independently. The degree of freedom in setting the drop rate y and the terminal add / drop rate z is increased. Similarly, the add-side optical switch mechanism SWB is provided independently of the wavelength switch cross-connect unit WXC at the subsequent stage of the optical switch WGSWA that joins the wavelength-groomed wavelength group of the wavelength group path cross-connect unit BXC. In parallel with the transfer of the add wavelength group to the optical switch WGSWA that joins the wavelength groomed wavelength group, the transfer of the add wavelength group from the origination processing unit TB to the output side optical fiber is performed independently. The degree of freedom in setting the grooming add / drop rate y and the termination add / drop rate z is increased.

  According to the hierarchical optical path cross-connect device OXC of the present embodiment, the wavelength division multiplexed light path transmitted by the plurality of input side optical fibers or the wavelength groups demultiplexed by the wavelength group demultiplexers AB1 to ABK. A path provided between the path and the termination processing unit (drop-side optical signal termination processing unit) TA, separating a part of the wavelength group constituting the wavelength division multiplexed light, and a transfer path to the wavelength path cross-connect unit A drop-side optical switch mechanism SWA that outputs to the termination processing unit TA independently, and / or a wavelength-division multiplexed light path corresponding to a plurality of output-side optical fibers, or a wavelength group path combined with the path and an origination processing unit (additional unit). Side optical signal termination processing unit) TB, and the add wavelength group transferred from the origination processing unit TB is connected to the wavelength path cross-connect unit WXC. Since an add-side optical switch mechanism SWB that joins a plurality of output-side optical fibers is provided independently of these joining paths, an optical signal is sent to the optical signal termination processing unit (terminate processing unit TA and origination processing unit TB). The optical switch mechanism for sending is simplified, and the scale of the switch mechanism in the wavelength path cross-connect unit WXC is reduced. Further, the add / drop rate z for the wavelength group to be transferred in association with the optical signal termination processing unit (the termination processing unit TA and the origination processing unit TB) is set to the wavelength group path cross-connect unit BXC and the wavelength path cross-connect unit WXC. Can be set independently from the add / drop rate y for grooming of the wavelength group transferred in relation to the wavelength grooming process, so that it is provided in the optical signal termination processing unit (termination processing unit TA and origination processing unit TB). The scale of the matrix optical switch is greatly reduced.

  Further, according to the hierarchical optical path cross-connect device OXC of the present embodiment, the drop-side optical switch mechanism SWA transmits in parallel a plurality of wavelength groups demultiplexed for each of the plurality of input-side optical fibers. A plurality (M) each of which is provided in a group path and outputs a number of wavelength groups limited by a preset drop rate z among the plurality of wavelength groups to a termination processing unit (drop-side optical signal termination processing unit) TA. ) K × zKM optical switches, the add / drop ratio z for the wavelength group transferred in association with the termination processing is set to the wavelength group path cross-connect unit BXC and the wavelength by the plurality of optical switches. Since it can be set independently from the add / drop rate y for grooming of the wavelength group transferred in relation to the wavelength grooming process with the path cross connect unit WXC, the optical signal termination processing unit Scale matrix optical switch provided Termination unit TA and originated processor TB) is reduced significantly.

  Further, according to the hierarchical optical path cross-connect device OXC of this embodiment, the termination processing unit (drop side optical signal termination processing unit) TA receives the wavelength group output from the drop side optical switch mechanism SWA. A plurality of wavelength demultiplexers for demultiplexing these wavelength groups in units of wavelengths, and a wavelength demultiplexer provided between the wavelength demultiplexer WB and a plurality of receivers provided in the electric layer EL. A so-called colorless function because it includes a single zKMN × zKMN matrix optical switch that outputs the wavelength demultiplexed by the wave WB to any one of a plurality (zKMN) of receivers PD. And a directionless function.

  Here, a device used in the present embodiment will be described. For example, as shown in FIG. 3, the matrix optical switch MS outputs optical signals of wavelength groups or wavelength units respectively input to a plurality of input ports from a plurality of output ports in an arbitrary arrangement order. Using technology, the optical path between multiple input fibers and multiple output fibers can be selectively formed by collimation and one or two-axis micro movable mirror (MEMS mirror), or PLC (Planar Lightwave This is an optical matrix optical switch composed of a glass waveguide and MZI (Mach-Zehnder interferometer) using circuit technology. The matrix optical switch MS becomes complicated and expensive in proportion to the product of the number of input ports and the number of output ports. In addition, the optical coupler is configured by, for example, a part of cores of a plurality of optical fibers being melt-bonded to each other. As shown in FIG. In the case of having an output port, the wavelength-multiplexed lights λ1 to λ4 are output as they are from a plurality of output ports, and the optical signal intensity is 1 / number of each output port. Further, in the case of having one output port for a plurality of input ports as shown in FIG. 5, when wavelengths λ2, λ1, and λ4, λ3 are respectively input, all of the input optical signals are input. Wavelengths λ1 to λ4 are output from one output port, and the optical signal intensity of each wavelength is 1 / input port number of the input signal intensity.

  The above wavelength group demultiplexers AB1 to ABK, wavelength group multiplexers BB1 to BBK, wavelength demultiplexers AW1 to AWyKM, wavelength demultiplexers BW1 to BWyKM, wavelength demultiplexer WB, wavelength demultiplexer WG are well known. Arrayed waveguide grating AWG. For example, in the case of the 16 × 16 arrayed waveguide grating AWG in FIG. 6, the arrayed waveguide grating AWG is demultiplexed when wavelength multiplexed light λ1 to λ16 is input to the input port 1. Wavelengths λ1 to λ16 are output in parallel from the output ports. Conversely, when wavelengths λ1 to λ16 are input in parallel from 16 output ports, they are multiplexed from the input port and wavelength multiplexed light λ1 to λ16 are output. When the wavelength multiplexed light λ2 to λ17 is input to the input port 2, it is demultiplexed and the wavelengths λ2 to λ17 are output in parallel from the 16 output ports. Conversely, when wavelengths λ2 to λ17 are input in parallel from 16 output ports, they are multiplexed from the input port and wavelength multiplexed light λ2 to λ17 are output.

  The wavelength selective switch is for outputting an arbitrary wavelength or wavelength group constituting the wavelength-division multiplexed optical signal input to one input port from an arbitrary output port, using MEMS technology. An optical path between a plurality of input fibers and a plurality of output fibers is provided with a diffraction grating for multiplexing / demultiplexing, collimation, and a biaxial micro movable mirror (MEMS mirror), for example, arrayed on one substrate Thus, the optical signals from the plurality of optical fibers can be arbitrarily operated. For example, in the example shown in FIG. 7, when an optical signal in which wavelengths λ1 to λ8 are multiplexed is input to the input port, λ1 and λ4 are output from the output port 2 among the wavelengths constituting the wavelength multiplexed light. λ2, λ3, and λ7 are output from the output port 3, λ6 is output from the output port 4, and λ5 and λ8 are output from the output port 5. In the example shown in FIG. 8, when a wavelength group consisting of wavelengths λ1 to λ16 is input, the wavelength groups WB1 and WB2 are output from the output port 2, the wavelength group WB3 is output from the output port 3, and the wavelength The group WB4 is output from the output port 5.

  Next, another embodiment of the present invention will be described. In the following description, parts common to the embodiments are denoted by the same reference numerals and description thereof is omitted.

  The hierarchical optical path cross-connect device OXC shown in FIG. 9 differs from the optical path cross-connect device OXC in FIG. 1 in the contents of the wavelength group optical path cross-connect device BXC and the wavelength path cross-connect device WXC. The others are configured similarly.

  As shown in FIG. 9, the wavelength group optical path cross connect device BXC of the present embodiment includes wavelength groups WB11 to WB1M, WB21 to WB2M, which are demultiplexed by K wavelength group demultiplexers AB1 to ABK. K M × 1 wavelength group multiplexers CB1 to CBK for returning WBK1 to WBKM to the original wavelength division multiplexed light corresponding to the input side optical fibers Fi1, Fi2,. K 1 × (K + 1) wavelength group selection switches WBSS1 to WBSK for demultiplexing a predetermined wavelength group among the wavelength groups constituting the multiplexed light and outputting them from an arbitrary output port, and these wavelength groups Wavelengths corresponding to K output-side optical fibers Fo1, Fo2,... FoK by combining the wavelength groups output from the selection switches WBSS1 to WBSK and the wavelength groups groomed by the wavelength path cross-connect device WXC. The K (K + 1) × 1 optical couplers BPC1 to BPCK that output the split multiplexed light, and the K 1s that output the wavelength division multiplexed light output from these optical couplers BPC1 to BPCK by demultiplexing them into wavelength groups, respectively. × M wavelength group demultiplexers DB1 to DBK.

  The wavelength path cross-connect device WXC is output from the wavelength selection switches WSS1 to WSSK for demultiplexing a predetermined wavelength from the wavelength groups received from the wavelength group selection switches WBSS1 to WBSK and the wavelength selection switches WSS1 to WSSK, respectively. Optical couplers WPC1 to WPCK for combining wavelengths and outputting to the optical couplers BPC1 to BPCK are provided. The wavelength group optical path cross-connect device BXC and the wavelength path cross-connect device WXC of this embodiment have the same functions as the optical path cross-connect device OXC of FIG. 1, and therefore the optical path cross-connect device of FIG. The same effect as OXC can be obtained. That is, the optical switch mechanism for sending an optical signal to the optical signal termination processing unit (terminate processing unit TA and origin processing unit TB) is simplified, and the scale of the switching mechanism in the wavelength path cross-connect unit WXC is reduced. Further, the add / drop rate z for the wavelength group to be transferred in association with the optical signal termination processing unit (terminate processing unit TA and origination processing unit TB) is set as the wavelength group path cross-connect unit BXC and the wavelength path cross-connect unit WXC. Can be set independently from the add / drop rate y for grooming of the wavelength group transferred in relation to the wavelength grooming process, so that it is provided in the optical signal termination processing unit (termination processing unit TA and origination processing unit TB). The scale of the matrix optical switch is greatly reduced.

  The hierarchical optical path cross-connect device OXC shown in FIG. 10 has contents of K drop-side optical switch devices SWA and add-side optical switch devices SWB as compared with the optical path cross-connect device OXC shown in FIGS. Are different, but the others are configured similarly.

  In FIG. 10, K drop-side optical switch mechanisms SWA are provided for each of M wavelength group paths respectively corresponding to one wavelength division multiplexed light demultiplexed from K wavelength group demultiplexers AB1 to ABK. The M × zM optical switch transfers zKM wavelength group paths to the termination processing unit TA. The add-side optical switch mechanism SWB is a zM × M optical switch provided for each of the M wavelength group paths respectively corresponding to the output-side optical fibers, and has zKM wavelength groups transferred from the origination processing unit TB. The path is joined to a predetermined output side optical fiber. Since the drop-side optical switch mechanism SWA and the add-side optical switch mechanism SWB have functions similar to those of the optical path cross-connect device OXC shown in FIGS. 1 and 9, the same operational effects can be obtained. In the present embodiment, the termination add / drop ratio z can be set for each fiber.

  The hierarchical optical path cross-connect device OXC shown in FIG. 11 differs from the optical path cross-connect device OXC shown in FIGS. 1 and 9 in the contents of the drop-side optical switch device SWA and the add-side optical switch device SWB. However, others are configured similarly.

  In FIG. 11, the drop-side optical switch device SWA is a K × zK optical switch provided in M on the wavelength group path for transmitting the wavelength groups demultiplexed from the K wavelength group demultiplexers AB1 to ABK. , ZKM wavelength group paths are transferred to the termination processing unit TA. The add-side optical switch device SWB is a zK × K optical switch provided in M wavelength group paths respectively corresponding to the output-side optical fibers, and the zKM wavelength group paths transferred from the origination processing unit TB are set to a predetermined value. Join the output optical fiber. Since the drop-side optical switch device SWA and the add-side optical switch device SWB have the same functions as those of the optical path cross-connect device OXC of FIGS. 1 and 9, the same operational effects can be obtained. In this embodiment, the termination add / drop rate z can be set in units of wavelength groups.

  The termination processing unit TA shown in FIG. 12 receives a wavelength group output from the drop-side optical switch mechanism SWA and demultiplexes the wavelength group into wavelength units, and a plurality of wavelength demultiplexers. Provided between the wave WB and the plurality of receivers PD provided in the electric layer EL, and outputs the wavelength demultiplexed by the wavelength demultiplexer WB to any one of the plurality of receivers PD. A matrix optical switch MS1, MS2, MS3 having a three-stage configuration, and an a-branch optical coupler PC provided between the matrix optical switch MS2 and the matrix optical switch MS3 are provided. The matrix optical switch MS1 is an a × (2a-1) matrix optical switch, the matrix optical switch MS2 is 2a-1 r × r matrix optical switches, and the matrix optical switch MS1 and the matrix optical switch MS2 are mutually connected. Cross connected. The matrix optical switch MS3 is zKMN (2a-1) × 1 matrix optical switches. Here, a is expressed by Formula 1 and r is expressed by Formula 2.

  The origination processing unit TB shown in FIG. 12 is provided in the plurality of wavelength multiplexers WG that multiplex the wavelength group to be output to the add-side optical switch mechanism SWB, the plurality of wavelength demultiplexers WG, and the electrical layer EL. A matrix light having a three-stage configuration that is provided between a plurality of transmitters ED and that multiplexes add wavelengths input from the plurality of transmitters ED provided in the electrical layer EL and outputs them to the wavelength multiplexer WG. The switches MS1, MS2, and MS3, and the a-branch optical coupler PC provided between the matrix optical switch MS2 and the matrix optical switch MS3 are provided. The matrix optical switch MS1 is a (2a-1) × a matrix optical switch, the matrix optical switch MS2 is 2a-1 r × r matrix optical switches, and the matrix optical switch MS1 and the matrix optical switch MS2 are mutually connected. Cross connected. The matrix optical switch MS3 is zKMN 1 × (2a-1) matrix optical switches. According to the termination processing unit TA and the origination processing unit TB of the present embodiment, since it has the same functions as the termination processing unit TA and the origination processing unit TB of FIG. It is possible to provide a colorless function and a directionless function. Further, the termination processing unit TA and the origination processing unit TB of the present embodiment are composed of matrix optical switches MS1, MS2, and MS3 having a three-stage configuration as compared with the termination processing unit TA and the origination processing unit TB of FIG. Therefore, the switch scale becomes small.

  The termination processing unit TA shown in FIG. 13 receives zKM wavelength groups output from the drop-side optical switch mechanism SWA and branches respectively, and all wavelengths from the zKM optical couplers. And zKMN zKM × 1 matrix optical switches that receive the group and select any one wavelength group to output to the electrical layer EL. The electric layer EL has a digital coherent reception processing function, extracts a desired wavelength channel included in the wavelength group received by the receiver (photodiode), and converts it into an electric signal corresponding to the wavelength. The origination processing unit TB shown in FIG. 14 receives zKMN 1 × zKM matrix optical switches that receive a predetermined wavelength output from the transmitter of the electrical layer EL and outputs it from any output port, and 1 of those zKMN XzKM optical couplers that combine the wavelengths from the zKM matrix optical switch into a wavelength group and output the resultant to the add-side optical switch mechanism SWB. According to the termination processing unit TA and the origination processing unit TB of the present embodiment, since it has the same functions as the termination processing unit TA and the origination processing unit TB of FIG. It is possible to provide a colorless function and a directionless function. Further, the termination processing unit TA and the origination processing unit TB of the present embodiment are provided with only zKMN zKM × 1 matrix optical switches as compared with the termination processing unit TA and the origination processing unit TB of FIG. Scale is reduced.

  Compared with the hierarchical optical path cross-connect device OXC shown in FIG. 10, the hierarchical optical path cross-connect device OXC shown in FIG. 15 adds and drops between the drop-side optical switch mechanism SWA and the termination processing unit TA. A rate control unit (terminate rate control unit) ZCA is provided, and an add drop rate control unit (originate rate control unit) ZCB is provided between the add-side switch mechanism SWB and the origination processing unit TB. Yes.

  As shown in FIG. 16, the add / drop rate control unit ZCA includes KM zK branch couplers provided corresponding to the KM wavelength groups transferred from the drop-side optical switch mechanism SWA, and outputs from them. And zKM K × 1 matrix optical switches that select a predetermined wavelength group from the selected wavelength group and output the selected wavelength group to the termination processing unit TA. The add drop rate control unit ZCB receives zKM wavelength groups from the origination processing unit TB, selects zKM to be added to any fiber, and outputs them from the 1 × K matrix optical switch. KM zK branching couplers that combine the wavelength groups from the determined wavelengths and transfer them to the add-side optical switch mechanism SWB.

  Since the optical path cross-connect device OXC of this embodiment has the same function as the hierarchical optical path cross-connect device OXC shown in FIGS. 1 and 10, the optical signal termination processing unit (termination processing unit TA) In addition, the optical switch mechanism for sending an optical signal to the origination processing unit TB) is simplified, and the reduction of the scale of the switch mechanism in the wavelength path cross-connect unit WXC is simplified. Further, according to the hierarchical optical path cross-connect device OXC of the present embodiment, the add / drop for wavelength group to be transferred in association with the termination processing by the add / drop rate control unit ZCA (wavelength group number limiting unit). Since the rate z can be set independently of the wavelength group grooming add / drop rate y transferred between the wavelength group path cross-connect unit BXC and the wavelength path cross-connect unit WXC in association with the wavelength grooming process, The scale of the matrix optical switch provided in the signal termination processing unit (termination processing unit TA and origination processing unit TB) is significantly reduced.

  Compared with the hierarchical optical path cross-connect device OXC shown in FIG. 11, the hierarchical optical path cross-connect device OXC shown in FIG. 17 adds and drops between the drop-side optical switch mechanism SWA and the termination processing unit TA. A rate control unit ZCA is provided, and an add drop rate control unit ZCB is provided between the add side switch mechanism SWB and the origin processing unit TB.

  As shown in FIG. 18, the add / drop rate control unit ZCA includes KM zM branch couplers provided corresponding to the KM wavelength groups transferred from the drop-side optical switch mechanism SWA, and outputs from them. A predetermined wavelength group is selected from the selected wavelength group, and zKM M × 1 matrix optical switches that output to the termination processing unit TA are provided. The add drop rate control unit ZCB receives zKM wavelength groups from the origination processing unit TB and selects which fiber to add to one of the fibers, and outputs from them. KM zM branching couplers that combine the wavelength groups from the determined wavelengths and transfer them to the add-side optical switch mechanism SWB.

  The optical path cross-connect device OXC of this embodiment has the same function as the hierarchical optical path cross-connect device OXC shown in FIGS. 9 and 11, and therefore, an optical signal termination processing unit (terminate processing unit TA). In addition, the optical switch mechanism for sending an optical signal to the origination processing unit TB) is simplified, and the reduction of the scale of the switch mechanism in the wavelength path cross-connect unit WXC is simplified. Further, according to the hierarchical optical path cross-connect device OXC of the present embodiment, the add / drop for wavelength group to be transferred in association with the termination processing by the add / drop rate control unit ZCA (wavelength group number limiting unit). Since the rate z can be set independently of the wavelength group grooming add / drop rate y transferred between the wavelength group path cross-connect unit BXC and the wavelength path cross-connect unit WXC in association with the wavelength grooming process, The scale of the matrix optical switch provided in the signal termination processing unit (termination processing unit TA and origination processing unit TB) is significantly reduced.

  The hierarchical optical path cross-connect device OXC shown in FIG. 19 is different from the hierarchical optical path cross-connect device OXC shown in FIG. The difference is that it is composed of KM 1 × 2 switches provided in the above, but the rest is similarly constructed. Also in this embodiment, the same effect as the hierarchical optical path cross-connect device OXC shown in FIG. 15 can be obtained. The add / drop rate control unit ZCA and the add / drop rate control unit ZCB of the present embodiment are configured as shown in FIGS. 16 and 18, for example.

  The hierarchical optical path cross-connect device OXC shown in FIG. 20 is different from the hierarchical optical path cross-connect devices OXC shown in FIGS. 1, 9, 10 and 11 in terms of wavelength group demultiplexers AB1 to ABK and wavelength group multiplexing. The drop-side switch mechanism SWA is not provided with the devices BB1 to BBK, and the drop-side switch mechanism SWA has K 1 × (zM + 1) provided in the wavelength division multiplexed optical path corresponding to the input-side optical fibers Fi1, Fi2,. The add-side switch mechanism SWB is composed of wavelength group selection switches WBSS. The add-side switch mechanism SWB includes K (zM + 1) branch couplers provided in the wavelength division multiplexing optical path corresponding to the output-side optical fibers Fo1, Fo2,. Consists of The 1 × (zM + 1) wavelength group selection switch WBSS may be configured by multistage connection of smaller wavelength group selection switches WBSS. Also in this embodiment, the same effect as the hierarchical optical path cross-connect device OXC of the above-described embodiment can be obtained.

  The hierarchical optical path cross-connect device OXC shown in FIG. 21 is similar to the hierarchical optical path cross-connect device OXC shown in FIG. 20 in the hierarchical optical path cross-connect device OXC shown in FIGS. On the other hand, the wavelength group demultiplexers AB1 to ABK and the wavelength group multiplexers BB1 to BBK are not provided, and the configurations of the wavelength group path cross-connect unit BXC and the wavelength path cross-connect unit WXC are different. The drop-side switch mechanism SWA is different in that it is provided in the wavelength group path cross-connect unit BXC. The wavelength group path cross-connect unit BXC multiplexes K 1 × (K + zM + 1) wavelength group selection switches WBSS, the wavelength group output from them, and the groomed wavelength group from the wavelength path cross-connect unit WXC. K (K + 1) branch couplers are provided. The K 1 × (K + zM + 1) wavelength group selection switches WBSS include an output port to the termination processing unit TA in addition to the output port to the wavelength path cross-connect unit WXC and the (K + 1) branch coupler, and the drop side Also serves as a switch mechanism SWA. Also in this embodiment, the same effect as the hierarchical optical path cross-connect device OXC of the above-described embodiment can be obtained.

  The present inventors have adopted the termination processing unit TA and the origination processing unit TB shown in FIG. 2 in the hierarchical optical path cross-connect device OXC of FIG. 17 in contrast to the conventional hierarchical optical path cross-connect device of FIG. 17 (first configuration), when the hierarchical optical path cross-connect device OXC in FIG. 17 employs the termination processing unit TA and origin processing unit TB shown in FIG. 12 (second configuration), the hierarchy in FIG. Type optical path cross-connect device OXC employs termination processing unit TA and origination processing unit TB shown in FIG. 13 and FIG. 14 (third configuration). Wavelength group number M is 10, wavelength number N in wavelength group is 8, grooming add / drop ratio y is 0.2, termination add / drop ratio z It compared the switch scale of time that was 0.3. FIG. 22 shows the comparison result. FIG. 23 shows the termination processing unit TA or the origination processing when only the origination / termination ratio (add / drop ratio for termination) z is changed in the first configuration, the second configuration, and the third configuration. The change of the switch scale in the part TB is shown.

  As shown in FIG. 22, the scale of the switch is greatly increased in the first configuration, the second configuration, and the third configuration in which the present invention is applied to the conventional hierarchical optical path cross-connect device in FIG. The first configuration is reduced by 64%, and the second configuration is reduced by 62%. As shown in FIG. 23, in the first configuration, the second configuration, and the third configuration, the switch scale decreases as the termination add / drop ratio z decreases.

  As mentioned above, although one Example of this invention was described based on drawing, this invention is applied also in another aspect.

  For example, in the relay node of the above-described embodiment, the input side optical fibers Fi1, Fi2,... FiK and the output side optical fibers Fo1, Fo2,. Number of groups M, number of wavelengths N included in one wavelength group, add / drop rate y between wavelength group level WBL and wavelength level WLL, add / drop rate between wavelength group level WBL and electrical level EL z can be variously changed as necessary.

  Further, the termination processing unit TA and the origination processing unit TB provided in the optical path cross-connect device OXC provided in the above-described relay node may be replaced with each other.

  In addition, although not illustrated one by one, the present invention can be variously modified without departing from the spirit of the present invention.

OXC: Optical path cross-connect device (hierarchical optical path cross-connect device)
BXC: Wavelength group path cross-connect unit WXC: Wavelength path cross-connect unit TA: Terminate processing unit (drop-side optical signal termination processing unit)
TB: Origination processing unit (add-side optical signal termination processing unit)
SWA: drop side optical switch mechanism SWB: add side optical switch mechanism RN: relay node EL: electrical layer MS: matrix optical switch

Claims (8)

A plurality of wavelength division multiplexed lights respectively transmitted through a plurality of input side optical fibers are demultiplexed into respective wavelength groups, and the route of the new wavelength division multiplexed light recombined in units of the wavelength groups is switched. wavelength included a wavelength group path cross-connect unit to transmit, to the wavelength group receiving the dropped wavelength group by the following grooming for add-drop rate set in advance from the wavelength group path cross-connect unit from the output optical fiber Te A wavelength path cross-connect unit that sends a new wavelength group that has been recombined into the wavelength units to the wavelength-division multiplexed light so as to be included in the wavelength division multiplexed light, and via the input-side optical fiber Drop-side optical signal for selecting a drop wavelength included in any of a plurality of wavelength groups constituting the plurality of wavelength division multiplexed lights transmitted and outputting the selected drop wavelength to the electrical layer An end processing unit, and an add-side optical signal termination process in which an add wavelength input from the electrical layer is added to one of a plurality of wavelength groups included in the plurality of wavelength division multiplexed lights and transmitted from the output-side optical fiber An optical path network hierarchical optical path cross-connect device comprising:
Provided between the path of wavelength division multiplexed light transmitted by the plurality of input side optical fibers or the wavelength group path demultiplexed therefrom and the drop side optical signal termination processing unit, via the input side optical fiber The wavelength group constituting the wavelength division multiplexed light transmitted in the above range is within a preset termination add-drop ratio , and the drop-side optical signal termination processing unit is independent of the transfer path to the wavelength path cross-connect unit. A drop-side optical switch mechanism that outputs to and / or a wavelength-division multiplexed light path corresponding to the plurality of output-side optical fibers, or a wavelength group path that combines them, and the add-side optical signal termination processing unit provided, the wavelength groups transferred from the add-side optical signal termination section, within the range of preset terminating add-drop rate, Germany and join path from the wavelength path cross-connect unit Add side optical switch mechanism which join a plurality of output optical fiber to a saw including,
The grooming add / drop rate and the termination add / drop rate can be set independently of each other.
A hierarchical optical path cross-connect device for an optical path network. The drop-side optical switch mechanism is provided in the wavelength group path for transmitting a plurality of wavelength groups that are demultiplexed for each of the plurality of input optical fibers a parallel manner, is the pre-set among the wavelength group of said plurality of 2. The hierarchical optical path cross-connect device for an optical path network according to claim 1, further comprising a plurality of optical switches that respectively output the number of wavelength groups limited by the termination add / drop ratio to the drop-side optical signal termination processing unit. The drop-side optical switch mechanism is provided in a wavelength group path that transmits a plurality of wavelength groups demultiplexed for each of the plurality of input-side optical fibers in parallel, and outputs the plurality of wavelength groups; a wavelength group number limiting unit for outputting respective wavelength group number which is limited by the preset terminating add-drop rate of the plurality wavelength groups output from the light switch to the drop-side optical signal termination unit The hierarchical optical path cross-connect device for an optical path network according to claim 1. The drop-side optical switch mechanism is provided for each of the plurality of input side optical fiber, which is the pre-set of the plurality of wavelength groups which constitute the plurality of input optical wavelength division multiplexed light that has been transmitted by the fiber 2. The hierarchical optical path cross-connect device for an optical path network according to claim 1, further comprising a wavelength group selection switch for outputting the number of wavelength groups limited by the termination add / drop ratio to the drop-side optical signal termination processing unit.   The drop-side optical signal termination processing unit receives a wavelength group output from the drop-side optical switch mechanism and demultiplexes the wavelength group in units of wavelengths, and the plurality of wavelength demultiplexers A single matrix light that is provided between a receiver and a plurality of receivers provided in the electrical layer, and outputs the wavelength demultiplexed by the wavelength demultiplexer to any one of the plurality of receivers The hierarchical optical path cross-connect device for an optical path network according to claim 2, further comprising a switch.   The drop-side optical signal termination processing unit receives a wavelength group output from the drop-side optical switch mechanism and demultiplexes the wavelength group in units of wavelengths, and the plurality of wavelength demultiplexers A three-stage matrix that is provided between a receiver and a plurality of receivers provided in the electrical layer, and outputs the wavelength demultiplexed by the wavelength demultiplexer to any one of the plurality of receivers 3. The hierarchical optical path cross-connect device for an optical path network according to claim 2, further comprising an optical switch.   The drop-side optical signal termination processing unit receives the wavelength group separated by the drop-side optical switch mechanism, and branches and outputs the wavelength group, and the same number of optical couplers as the number of wavelength groups, and the plurality of optical couplers Receiving all of the plurality of wavelength groups branched from the wavelength group, selecting one wavelength group from the plurality of wavelength groups, to any one of the plurality of receivers having a coherent reception function provided in the electrical layer 3. The hierarchical optical path cross-connect device for an optical path network according to claim 2, wherein the optical path network includes the same number of matrix optical switches as the receivers. The wavelength group number limiting unit receives and branches the wavelength groups separated by the drop-side optical switch mechanism, receives the same number of couplers as the wavelength groups, and receives the wavelength groups branched from the couplers. A matrix optical switch having the same number as the number of wavelength groups output to the drop side optical signal termination processing unit, selecting one wavelength group from a plurality of wavelength groups and outputting the selected wavelength group to the drop side optical signal termination processing unit; The hierarchical optical path cross-connect device for an optical path network according to claim 3.

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