JP2009147913A - Optical transmission device, and optical network using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem wherein, in a WXC device 200A using a wavelength selection switch (WSS), a WDM signal composed of a plurality of wavelengths is transferred in a path where the signal is transferred from a reception side WSS 1 to a transmission side WSS 2, and it is not divided wavelength by wavelength, and thereby a regenerative repeater is not inserted. <P>SOLUTION: In order to insert a regenerative repeater into a WXC device 200A, there is provided at least one port that demultiplexes one wavelength among the wavelength multiplexed signals input to a WSS 1. An output of the port that demultiplexes one wavelength is input to the regenerative repeater 3, and its output is input to the WSS 1 again. Then the wavelength output from the regenerative repeater 3 is converted into another wavelength which is different from the wavelength that is input to the regenerative repeater 3 and is processed by the WSS 1 in advance. The output from the regenerative repeater 3 is input to the WSS 1 through an optical coupler 4 or another input port of the WSS 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optical transmission device and an optical network, and more particularly to an optical transmission device and an optical network using a wavelength selective switch.

  In wavelength-division-multiplexing (WDM: Wavelength Division Multiplexing) optical network in which light of multiple wavelengths is multiplexed in one optical fiber, in switching by wavelength at a transmission device node, some wavelengths of the multiple wavelengths are changed. Optical add / drop multiplexers (OADM: Optical Add / Drop Multiplexer) that receive by branching and insert and transmit a part of a plurality of wavelengths are becoming the mainstream of optical networks. In the future, not only will some of the wavelengths be split and received, but will also be sent by assigning arbitrary wavelengths to multiple routes, and some wavelengths will be inserted and sent to arbitrary routes. Wavelength cross-connect (WXC) devices using wavelength selective switches have been developed and are expected to be deployed in optical networks.

  With reference to FIG. 1, the topology of a wavelength-controlled optical network using OADM and WXC will be described. Here, FIG. 1 is a block diagram of an optical network. For the sake of simplicity, one-way transmission / reception is shown in FIG. FIG. 1A shows only one node. Further, only representative nodes are described in “Add” and “Drop”. In FIG. 1 and subsequent drawings, a thick solid line represents an optical signal having a wavelength of 1 or more, and a thin solid line represents an optical signal having a wavelength of 1.

  The OADM optical network is configured by a linear or ring network as shown in FIGS. A WDM signal in which a plurality of wavelengths are multiplexed is dropped, added, and through for each wavelength by the OADM device 100, and an optical signal is transmitted and received between the nodes.

  The WXC node of the WXC optical network is applied to a mesh network node or an inter-ring connection node as shown in FIGS. The WXC device 200 performs drop, add, and through operations for each wavelength of WDM signals coming from a plurality of routes, distributes the signals to a plurality of routes, and transmits and receives optical signals between the nodes.

  In FIG. 1D, a node other than the inter-ring connecting node is the OADM device 100, but may be a WXC device 200. In FIG. 1, the drop optical signal is output to a first optical transponder (not shown). On the other hand, the add optical signal is an output signal of a second optical transponder (not shown) having a predetermined wavelength.

The configuration of the OADM device will be described with reference to FIG. Here, FIG. 2 is a block diagram of the OADM apparatus. In FIG. 2, a WDM signal which is a wavelength multiplexed signal is separated for each wavelength by a DMUX (Demultiplexer) 11 and dropped or passed through. The added wavelength is multiplexed by a through signal and a MUX (Multiplexer) 12 and transmitted. The OADM device 100 has a two-way / bidirectional configuration of a route a and a route b. Here, since the through signal is separated into one wavelength for each wavelength, a regenerative repeater (RGN: Regenerator) 3 is used when the transmitted optical signal is deteriorated due to an optical SN shortage or the like. Thus, optical-electrical-optical conversion can be performed and a new optical signal can be transmitted.
However, for a WXC device using a wavelength selective switch, as shown in Patent Document 1, there is no port separated for each wavelength with respect to the through signal, so a regenerative repeater can be inserted. There wasn't.

JP 2003-125430 A

  The present invention provides an optical transmission apparatus and an optical network using a wavelength selective switch capable of regenerative relay for a through signal.

  In order to insert the regenerative repeater into the wavelength selective switch, at least one or more ports for separating one wavelength among the wavelength multiplexed signals input to the wavelength selective switch are provided. The output of the port from which one wavelength is separated is input to the regenerative repeater, and the output is input again to the wavelength selective switch. At this time, the wavelength output from the regenerative repeater is different from the wavelength input to the regenerative repeater and is converted into a wavelength that can be processed by the wavelength selective switch. The output from the regenerative repeater is input to the wavelength selective switch through an optical coupler, a wavelength multiplexing filter, or another input port of the wavelength selective switch. Since the output of the regenerative repeater is converted to a wavelength different from that of the input, it does not return to the input of the regenerative repeater again through the wavelength selective switch.

  The reproduced optical signal re-input to the wavelength selective switch is output to one of the output ports by the wavelength selective switch, and is sent to the corresponding path through another multi-important wavelength selective switch.

  The problem described above includes a wavelength selective switch having an input port and a plurality of output ports, and a regenerative repeater that regenerates an optical signal. The wavelength selective switch inputs an optical signal having a first wavelength to the regenerative repeater. The regenerative repeater can be achieved by an optical transmission device that converts an optical signal of the first wavelength into an optical signal of the second wavelength and inputs the optical signal to the first wavelength selective switch.

  In addition, a first wavelength selective switch including a first input port and first to third output ports, a second input port connected to the first output port, a third input port, and a fourth A second wavelength selective switch having an output port; and a regenerative repeater that regenerates an optical signal. The first wavelength selective switch receives the first wavelength multiplexed optical signal at the first input port; The optical signal of the first wavelength included in the first wavelength multiplexed signal is input from the third output port to the regenerative repeater, the drop optical signal is transmitted from the second output port, and the second wavelength selection The switch receives the add optical signal at the third input port, transmits the second wavelength multiplexed optical signal from the fourth output port, and the regenerative repeater transmits the optical signal of the first wavelength to the second wavelength. Transmission that is converted into an optical signal and input to the first wavelength selective switch The location can be achieved.

  Wavelengths connecting a first ring network interconnected by a plurality of optical branching devices, a second ring network interconnected by a plurality of optical branching devices, and the first ring network and the second ring network The wavelength cross-connect device includes a first wavelength selective switch including a first input port and first to third output ports, and a second wavelength connected to the first output port. A second wavelength selective switch having an input port, a third input port, and a fourth output port; and a regenerative repeater for regenerating an optical signal, wherein the first wavelength selective switch is a first input port The first wavelength-multiplexed optical signal is received at, and the optical signal of the first wavelength included in the first wavelength-multiplexed signal is input from the third output port to the regenerative repeater, and from the second output port drop The second wavelength selective switch receives the add optical signal at the third input port, transmits the second wavelength multiplexed optical signal from the fourth output port, and the regenerative repeater This is achieved by an optical network that converts an optical signal having a wavelength of 2 to an optical signal having a second wavelength and inputs the optical signal to the first wavelength selective switch.

  According to the present invention, it is possible to provide an optical transmission apparatus and an optical network in which a regenerative repeater can be used in combination with a wavelength selective switch, and optical path restriction due to signal quality degradation is free.

  Embodiments of the present invention will be described below with reference to the drawings using examples. The same reference numerals are assigned to substantially the same parts, and the description will not be repeated.

  With reference to FIG. 3, the configuration of a WXC apparatus using a wavelength selective switch will be described. Here, FIG. 3 is a block diagram of the WXC apparatus. In FIG. 3 and subsequent figures, the wavelength selective switch may be referred to as WSS (Wavelength Selective Switch).

  In FIG. 3, the WXC device 200 is a four-way WXC device. The WXC apparatus 200 uses 1-input N-output (hereinafter referred to as 1 × N, where N = 4) WSS1 and N × 1 WSS2 on the reception side and transmission side. The receiving side WSS 1 distributes not only the signal for dropping the received WDM signal to the drop port by the WXC device controller 5 but also the other three directions as the WDM signal. The transmitting-side WSS2 multiplexes signals distributed from the other three paths as WDM signals in addition to the add signal, and sends the multiplexed signals to the optical transmission path. A DMUX 11 is connected to the drop port of the receiving side WSS1 of the WXC apparatus 200, and wavelength-separates the dropped wavelength division multiplexed signal. Conversely, the MUX 12 is connected to the add port of the transmission side WSS2 of the WXC apparatus 200, and the optical signal to be added is wavelength-multiplexed. An optical transponder (not shown) is connected to each of the output port of DMUX 11 and the input port of MUX 12.

  As shown in FIG. 3, in the WXC apparatus 200 using the wavelength selective switches 1 and 2, a WDM signal composed of a plurality of wavelengths is transferred in a path transferred from the receiving side WSS1 to the transmitting side WSS2. . That is, the regenerative repeater cannot be inserted because it is not separated for each wavelength.

  This will be described with reference to FIG. In FIG. 4A, the receiving side WSS1 has 1 × N WSS (N = 4) with 1 input port and N output ports. The input light is composed of a wavelength group L1a composed of a plurality of wavelengths, and is distributed to wavelength groups L1b, L1c, L1d, and L1s of arbitrary wavelengths by the controller 5 shown in FIG. The number of wavelengths of L1a is equal to the sum of the number of wavelengths of L1b, L1c, L1d, and L1s. Wavelength groups L1b, L1c, and L1d are directed to paths b, c, and d, respectively, and L1s is a drop signal wavelength group.

  In FIG. 4B, the wavelength groups L1b, L1c, and L1d transferred to the transmission side WSS2 are WDM signals each composed of a plurality of wavelengths. The WSS 1 is a device that performs demultiplexing and path switching with a single housing module, and it is impossible to take out only a single wavelength from the housing and perform some processing. Therefore, the regenerative repeater cannot be inserted for each wavelength.

  Further, the transmission side WSS2 shown in FIG. 4B has Nx1 WSS (N = 4) with N input ports and 1 output port. The input light is a wavelength group L2a, L2c, L2d consisting of a plurality of wavelengths coming from the respective paths a, c, d, and an add signal wavelength group L2s. The controller 5 shown in FIG. Multiplexed and output. L2a = L1b. The sum of the number of wavelengths of L2a, L2c, L2d, and L2s is equal to the number of wavelengths of L2b. Therefore, in the WXC network using the wavelength selective switch described with reference to FIGS. 3 and 4, an optical signal passes through the node as it is without being converted into electricity and is transmitted to each path. For this reason, even if an optical signal deteriorates due to optical SNR or waveform distortion by passing through an optical transmission line, an optical amplifier, a WXC device, etc., it cannot be reproduced, and between desired nodes. Cannot be transmitted.

  With reference to FIG. 5, the configuration of another WXC apparatus using a wavelength selective switch will be described. Here, FIG. 5 is a block diagram of another WXC apparatus. As described with reference to FIG. 3, eight WSSs are required for the four-way route, but for simplicity of illustration, only two WSSs in one direction from the route a to the route b are taken out and described below. To do.

  In FIG. 5, the WXC apparatus 200 </ b> A includes 1 × 5 WSS 1, a wavelength separator 11, a wavelength multiplexer 12, 4 × 1 WSS 2, a regenerative repeater 3, a coupler 4, and a controller 5. The controller 5 controls the path setting for each wavelength of WSS1 and WSS2 and the output wavelength setting of the regenerative repeater 3 in the WXC apparatus 200A.

  The WXC apparatus 200A inputs the wavelength multiplexed signal composed of a plurality of wavelengths transmitted through the transmission path fiber of the path a to the input port 1ia of the reception side wavelength selective switch (WSS) 1 through the optical coupler 4. The receiving side WSS1 arbitrarily distributes the wavelength multiplexed signal to the output ports 1ob, 1oc, 1od, 1os, and 1os1, respectively, according to the setting from the controller 5. The output ports 1ob, 1oc, and 1od are outputs to the route b, the route c, and the route d, respectively. Since the transmission side WSS to the route c and the route d is omitted, the output port 1ob is connected to the input port 2ia of the transmission side WSS2 and is output from the output port 2ob of the transmission side WSS2 to the route b. The An output port 1os of WSS1 is a port for dropping to the WXC apparatus 200A, and is connected to a port 11o1 to 11on of the separator 11 to a transponder (not shown).

  Through the setting from the controller 5, the WSS 2 receives through signals from the route a, the route c, and the route d from the ports 2ia, 2ic, and 2id, respectively, and the multiplexer 12 connected to the port 2is is multiplexed. Add signal is input. The WSS2 transmits a WDM signal from the port 2ob to the route b. An optical transponder (not shown) is connected to the input ports 12 i 1 to 12 in of the multiplexer 12.

  Only one specific wavelength is output to the output port 1os1 of the WSS1 by setting from the controller 5, and signal regeneration (3R: Reshaping, Retiming, Regeneration) is performed by the regenerative repeater (RGN) 3. At this time, the output wavelength is set from the controller 5 so that the wavelength λj output from the regenerative repeater 3 is different from the wavelength λi input to the regenerative repeater 3, and is converted into a wavelength that can be processed by the WSS1. . The output from the regenerative repeater 3 is input to the WSS 1 through the optical coupler 4. Since the output of the regenerative repeater 3 is converted to a wavelength λj different from the input, it does not return to the input of the regenerative repeater 3 again through the WSS 1. Here, the wavelength output from the regenerative repeater 3 needs to be determined in advance as a regeneration wavelength when the wavelength is fixed. However, by using a regenerative repeater incorporating a wavelength tunable optical transmitter, it is possible to select from among the unused wavelengths among all the wavelengths that can be used by the wavelength selection switch by setting from the controller 5. Effective use of resources becomes possible. Since the optical receiver built in the regenerative repeater 3 has a wide dynamic range with respect to the wavelength, the receiving side may have any wavelength that can pass through WSS1 and WSS2. The above description is the same in other examples of the present specification.

  The reproduction optical signal of wavelength λj re-input to WSS1 is output to any of output ports 1ob, 1oc, and 1od by WSS1 set by controller 5, and is transmitted through transmission side WSS2 or WSS (not shown).

Table 1 Port-wavelength (group) correspondence table -------------------------
Receiver WSS
-------------------------
Input port Wavelength group Output port Wavelength (group)
-------------------------
1ob L1b
1oc L1c
1ia L1a 1od L1d
1os L1s
1os1 λi
-------------------------

Tables 1 to 3 show a table summarizing wavelengths or wavelength groups set by the controller 5 for each port of the WSS and the regenerative repeater (RGN) for the operation in FIG. In Table 1, “1ia” is registered as information for identifying the input port of WSS1 in FIG. 5, and information “L1a” for identifying the wavelength group is registered as information on the wavelength group of the signal light input to this input port. The Table 1 also shows “1ob”, “1oc”, “1od”, “1os”, “1os1” as information for identifying the output port of WSS1, and information for identifying the signal light output from these output ports. “L1b”, “L1c”, “L1d”, “L1s”, and “λi” are registered.
Note that the number of wavelengths of L1a is the sum of the number of wavelengths of L1b, L1c, L1d, and L1s + 1. One of L1b, L1c, and L1d includes λj. L1a includes λi and λj.

Table 2 Port-wavelength (group) correspondence table -------------------------
Sender WSS
-------------------------
Input port Wavelength group Output port Wavelength (group)
-------------------------
2ia L2a
2ic L2c 2ob L2b
2id L2d
2is L2s
-------------------------
Similarly, in Table 2 regarding WSS2, as information identifying the input port of WSS2, “2ia”, “2ic”, “2id”, “2is” and wavelength group information “L2a”, “L2c”, “ “L2d” and “L2s” are registered. As information for identifying the output port of WSS2, “2ob” and wavelength group information “L2b” corresponding thereto are registered.
Note that the total number of wavelengths of L2a, L2c, L2d, and L2s is equal to the number of wavelengths of L2b. The number of wavelengths of L1a is equal to the number of wavelengths of L2b.

Table 3 Input / output wavelength table ------------
RGN
------------
Input wavelength Output wavelength
------------
λi λj
------------

Further, in Table 3, for the regenerative repeater (RGN) 3 in FIG. 5, “λi” is used as information for identifying the wavelength of the signal light input to the input port, and “λj” is used as information about the wavelength output after conversion. Are registered respectively. Note that λi is not equal to λj.
The wavelength cross-connect device 200A stores the information in Tables 1 to 3 in a memory (not shown). The controller 5 refers to the information stored in this memory and makes each setting for WSS1, WSS2, and RGN3.

  With reference to FIG. 6, the configuration of another WXC apparatus using a wavelength selective switch will be described. Here, FIG. 6 is a block diagram of another WXC apparatus. In FIG. 6, the WXC apparatus 200 </ b> B includes a 1 × 6 WSS 1, a separator 11, a multiplexer 12, a 4 × 1 WSS 2, two regenerative repeaters 3-1, a regenerative repeater 3-2, a coupler 4, and a controller 5. Is done. The controller 5 controls the path setting for each wavelength of WSS1 and WSS2 and the output wavelength setting of the two regenerative repeaters 3 in the WXC apparatus 200B.

  The WXC device 200B outputs only one specific wavelength to the two output ports 1os1 and 1os2 of the receiving side WSS1 according to the setting from the controller 5, and regenerates the signal by another regenerative repeater (RGN) 3. At this time, the output wavelength is set from the controller 5 so that the wavelength output from the regenerative repeater 3 is different from the wavelength input to the regenerative repeater 3, and is converted to a wavelength that can be processed by the receiving side WSS1. To do. Outputs from the two regenerative repeaters 3 are input to the receiving side WSS 1 through the optical coupler 4. Since the output of the regenerative repeater 3 is converted to a wavelength different from that of the input, it does not return to the input of the regenerative repeater 3 again through the WSS 1.

Table 4 Port-wavelength (group) correspondence table -------------------------
Receiver WSS
-------------------------
Input port Wavelength group Output port Wavelength (group)
-------------------------
1ob L1b
1oc L1c
1ia L1a 1od L1d
1os L1s
1os1 λi
1os2 λm
-------------------------

  Tables 4, 2 and 5 show the table summarizing the wavelengths or wavelength groups for the respective ports of the WSS and the regenerative repeater (RGN) set by the controller 5 for the operation in FIG. In Table 4, “1ia” is registered as information for identifying the input port of the WSS1 in FIG. 6, and information “L1a” for identifying the wavelength group is registered as information on the wavelength group of the signal light input to the input port. The Also, in Table 4, “1ob”, “1oc”, “1od”, “1os”, “1os1”, “1os2” as information for identifying the output port of WSS1, and the signal light output from these output ports are shown. “L1b”, “L1c”, “L1d”, “L1s”, “λi”, and “λm” are registered as information for identifying each.

  The number of wavelengths of L1a is the sum of the number of wavelengths of L1b, L1c, L1d, and L1s + 2. One of L1b, L1c, or L1d includes λj and λn. L1a includes λi, λj, λm, and λn. The port-wavelength (group) correspondence table for WSS2 is the same as Table 2.

Table 5 Input / output wavelength table -----------------------
RGN1 RGN2
------------------------
Input wavelength Output wavelength Input wavelength Output wavelength
------------------------

λi λj λm λn

------------------------

  In Table 5, “λi” is registered as information for identifying the wavelength of the signal light input to the input port, and “λj” is registered as information of the wavelength to be output after conversion, for the regenerative repeater 3-1. . In Table 5, similar information is registered for the regenerative repeater 3-2. Note that λi is not equal to λj. Also, λm is not equal to λn.

  The wavelength cross-connect device 200B stores the information shown in FIG. H in a memory (not shown). The controller 5 refers to the information stored in this memory and makes each setting for WSS1, WSS2, RGN3-1, and RGN3-2.

  With reference to FIG. 7, the configuration of another WXC apparatus using a wavelength selective switch will be described. Here, FIG. 7 is a block diagram of another WXC apparatus. In FIG. 7, the WXC device 200 </ b> C includes 2 × 5 WSS 1, a separator 11, a multiplexer 12, 4 × 1 WSS 2, a regenerative repeater 3, a coupler 4, and a controller 5. The controller 5 controls the path setting for each wavelength of WSS1 and WSS2 and the output wavelength setting of the regenerative repeater 3 in the WXC apparatus 200C.

The WXC device 200C inputs a wavelength multiplexed signal composed of a plurality of wavelengths transmitted through the transmission path fiber of the path a to the input port 1ia of the receiving side WSS1. The output from the regenerative repeater 3 is input to WSS1 through another input port 1is of the receiving side WSS1. Since the output of the regenerative repeater 3 is converted to a wavelength different from the input by the setting from the controller 5, it does not return to the input of the regenerative repeater 3 again through the WSS1.

Table 6 Port-wavelength (group) correspondence table -------------------------
Receiver WSS
-------------------------
Input port wavelength (group) Output port wavelength (group)
-------------------------
1ob L1b
1oc L1c
1ia L1a 1od L1d
1is λj 1os L1s
1os1 λi
-------------------------

Table 6, Table 2, and Table 3 summarize the wavelength or wavelength group set for each port of the WSS and the regenerative repeater (RGN) set by the controller 5 for the operation in FIG. Table 6 identifies “1ia” and “1is” as information for identifying the input port of the WSS1 in FIG. 7, and identifies the wavelength (group) as information on the wavelength (group) of signal light input to these input ports. Information “L1a” and “λj” to be registered are associated with each input port. Table 6 also identifies “1ob”, “1oc”, “1od”, “1os”, “1os1” as information for identifying the output port of WSS1, and the signal light output from these output ports. “L1b”, “L1c”, “L1d”, “L1s”, and “λi” are registered as information.
The number of wavelengths of L1a is the total number of wavelengths of L1b, L1c, L1d, and L1s. One of L1b, L1c, and L1d includes λj. L1a includes λi.

The port-wavelength (group) correspondence table for WSS2 is the same as Table 2. The input / output wavelength table for the regenerative repeater 3 is the same as Table 3.
The wavelength cross-connect device 200C stores the information shown in Table 6, Table 2, and Table 3 in a memory (not shown). The controller 5 refers to the information stored in this memory and makes each setting for WSS1, WSS2, and RGN3.

  With reference to FIG. 8, the configuration of another WXC apparatus using a wavelength selective switch will be described. Here, FIG. 8 is a block diagram of another WXC apparatus. In FIG. 8, the WXC device 200D is composed of 2 × 6WSS1, separator 11, multiplexer 12, 4 × 1WSS2, two regenerative repeaters 3-1, regenerative repeater 3-2, coupler 4 and controller 5. Is done. The controller 5 controls the path setting for each wavelength of WSS1 and WSS2 and the output wavelength setting of the regenerative repeater 3 in the WXC apparatus 200D.

The WXC device 200D outputs only one specific wavelength to the plurality of output ports 1os1, 1os2 of the receiving side WSS1 according to the setting from the controller 5, and regenerates the signal by another regenerative repeater (RGN) 3. At this time, the output wavelength is set from the controller 5 so that the wavelength output from the regenerative repeater 3 is different from the wavelength input to the regenerative repeater 3, and is converted to a wavelength that can be processed by the receiving side WSS1. To do. Outputs from the two regenerative repeaters 3 are input to the receiving side WSS1 through the optical coupler 4 and the input port 1is of the receiving side WSS1. Since the output of the regenerative repeater 3 is converted to a wavelength different from that of the input, it does not return to the input of the regenerative repeater 3 again through the WSS 1.

Table 7 Port-wavelength (group) correspondence table -------------------------
Receiver WSS
-------------------------
Input port Wavelength group Output port Wavelength (group)
-------------------------
1ob L1b
1oc L1c
1ia L1a 1od L1d
1is λj, λn 1os L1s
1os1 λi
1os2 λm
-------------------------

  Tables 7, 2 and 5 show a table summarizing wavelengths or wavelength groups set by the controller 5 for each port of the WSS and the regenerative repeater (RGN) for the operation in FIG. Table 7 identifies “1ia” and “1is” as information for identifying the input port of the WSS 1 in FIG. 8, and identifies the wavelength (group) as information on the wavelength (group) of signal light input to these input ports. Information “L1a”, “λj”, and “λn” to be registered are associated with each input port. Table 7, “1ob”, “1oc”, “1od”, “1os”, “1os1”, “1os2” as information for identifying the output port of WSS1, and the signal light output from these output ports, respectively As identification information, “L1b”, “L1c”, “L1d”, “L1s”, “λi”, and “λm” are registered.

The number of wavelengths of L1a is the total number of wavelengths of L1b, L1c, L1d, and L1s. Λj and λn are included in any of L1b, L1c, or L1d. L1a includes λi and λm.
The port-wavelength (group) correspondence table for WSS2 is the same as Table 2. The regenerative repeater 3-1 and the regenerative repeater 3-2 are the same as those in Table 5.
The wavelength cross-connect device 200D stores the information shown in Table 7, Table 2, and Table 5 in a memory (not shown). The controller 5 refers to the information stored in this memory and makes each setting for WSS1, WSS2, RGN3-1, and RGN3-2.

It is a figure explaining the node which comprises an optical network. It is a block diagram of an optical network. It is a block diagram of an OADM device. It is a block diagram of a WXC device. It is operation | movement explanatory drawing of WSS. It is a block diagram of another WXC apparatus. It is a block diagram of another WXC apparatus. It is a block diagram of another WXC apparatus. It is a block diagram of another WXC apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Reception side wavelength selection switch (WSS), 2 ... Transmission side wavelength selection switch (WSS), 3 ... Regenerative repeater, 4 ... Optical coupler, 5 ... Controller, 11 ... Wavelength separator, 12 ... Wavelength multiplexer, 100 ... optical add / drop multiplexer (OADM), 200 ... wavelength cross-connect (WXC) apparatus.

Claims (10)

An optical transmission device comprising a first wavelength selective switch having a first input port and a plurality of first output ports, and a regenerative repeater for regenerating an optical signal,
The first wavelength selective switch inputs an optical signal having a first wavelength to the regenerative repeater,
The optical transmission apparatus, wherein the regenerative repeater converts the optical signal of the first wavelength into an optical signal of the second wavelength and inputs the optical signal to the first wavelength selective switch. The optical transmission device according to claim 1,
And a second wavelength selective switch comprising a plurality of second input ports and a second output port,
One of the plurality of first output ports and one of the plurality of second input ports are connected to each other. The optical transmission device according to claim 1 or 2,
An optical transmission apparatus characterized in that the transmitter of the regenerative repeater has a variable wavelength. The optical transmission device according to any one of claims 1 to 3,
The first wavelength selective switch further includes a third input port,
The regenerative repeater inputs an optical signal of the second wavelength from the third input port to the first wavelength selective switch. A first wavelength selective switch including a first input port and first to third output ports; a second input port connected to the first output port; a third input port; and a fourth output. An optical transmission device comprising a second wavelength selective switch having a port and a regenerative repeater for regenerating an optical signal,
The first wavelength selective switch receives a first wavelength multiplexed optical signal at the first input port, and receives an optical signal of a first wavelength included in the first wavelength multiplexed signal as the third wavelength. From the output port, input to the regenerative repeater, transmit a drop optical signal from the second output port,
The second wavelength selective switch receives an add optical signal at the third input port, and transmits a second wavelength multiplexed optical signal from the fourth output port;
The optical transmission apparatus, wherein the regenerative repeater converts the optical signal of the first wavelength into an optical signal of the second wavelength and inputs the optical signal to the first wavelength selective switch. The optical transmission device according to claim 5,
An optical transmission apparatus characterized in that the transmitter of the regenerative repeater has a variable wavelength. The optical transmission device according to claim 5 or 6, wherein
The first wavelength selective switch further includes a fourth input port,
The regenerative repeater inputs an optical signal of the second wavelength from the fourth input port to the first wavelength selective switch. Connecting a first ring network interconnected by a plurality of optical branching devices, a second ring network interconnected by a plurality of optical branching devices, and the first ring network and the second ring network In an optical network composed of wavelength cross-connect devices that
The wavelength cross-connect device includes: a first wavelength selective switch including a first input port and first to third output ports; a second input port connected to the first output port; A second wavelength selective switch having an input port and a fourth output port; and a regenerative repeater for regenerating an optical signal;
The first wavelength selective switch receives a first wavelength multiplexed optical signal at the first input port, and receives an optical signal of a first wavelength included in the first wavelength multiplexed signal as the third wavelength. From the output port, input to the regenerative repeater, transmit a drop optical signal from the second output port,
The second wavelength selective switch receives an add optical signal at the third input port, and transmits a second wavelength multiplexed optical signal from the fourth output port;
The regenerative repeater converts the optical signal having the first wavelength into an optical signal having the second wavelength and inputs the optical signal to the first wavelength selective switch. The optical network according to claim 8, comprising:
The optical network characterized in that the transmitter of the regenerative repeater has a variable wavelength. An optical network according to claim 8 or claim 9, wherein
The first wavelength selective switch further includes a fourth input port,
The regenerative repeater inputs the optical signal of the second wavelength from the fourth input port to the first wavelength selective switch.

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