JP5911104B2 - Optical demultiplexing transmission apparatus, control method, and optical demultiplexing transmission control system - Google Patents

Description

  The present invention relates to an optical demultiplexing transmission apparatus, a control method, and an optical demultiplexing transmission control system.

  In an optical fiber communication system, bidirectional communication (hereinafter referred to as “one-fiber bidirectional”) using a single-core optical fiber is advantageous in terms of equipment cost because it increases the utilization efficiency of the optical fiber. As the communication capacity increases, it is essential to increase the number of wavelength channels by wavelength division multiplexing (WDM) and to extend the transmission distance by using an optical fiber amplifier.

  On the other hand, OADM (Optical Add / Drop Multiplexing: optical add / drop multiplexer) that performs demultiplexing in units of wavelength channels in a repeater optical demultiplexing transmission device in two-way communication using two-core optical fibers (hereinafter referred to as two-fiber bi-directional) Therefore, an optical multiplex / demultiplexing apparatus for setting a wavelength path between repeater optical multiplex / demultiplexing apparatuses has been put into practical use, and a ROADM (Reconfigurable Optical Add / Drop Multiplexing) apparatus for performing wavelength path setting by remote control is widely used. . In general, an OADM or ROADM optical demultiplexing transmission apparatus that performs demultiplexing of wavelength channels is configured by combining a plurality of high-cost optical switch modules, optical fiber amplifiers, etc., so that the optical demultiplexing transmission apparatus is expensive. Become.

  Patent Document 1 discloses a related single-core bidirectional wavelength division multiplexing node. In the single-core bidirectional wavelength demultiplexing node disclosed in Patent Document 1, the wavelength is arranged in the repeater optical demultiplexing transmission apparatus in order to deploy the optical fiber amplifier in the transmission path because the wavelength deployment is odd wavelength → uplink, even wavelength → downlink. There is a need for a demultiplexer that demultiplexes channel interleaved and interleaved upstream and downstream wavelength channels.

  Patent Document 2 discloses a hierarchical optical path cross-connect device for an optical path network. The hierarchical optical path cross-connect device disclosed in Patent Document 2 reduces the scale of the switch mechanism of the wavelength path cross-connect unit by simplifying the optical switch mechanism to the termination processing unit.

  Patent Document 3 includes a reflector that reflects light that has passed through the wavelength demultiplexing means, so that the wavelength of the wavelength variable light source that serves as the signal light source can be easily adjusted to a wavelength that passes through the wavelength demultiplexing means. A transmission system is disclosed.

  Patent Document 4 does not require the provision of a large-scale cross-connect switch and a transponder aggregator depending on the number of corresponding routes, and enables transmission / reception optical signals of a specific transponder to communicate on any transmission route and any wavelength. A wavelength path communication node device that can reduce the introduction cost, reduce the device size, and reduce the power consumption is disclosed.

JP 2006-319557 A JP 2012-65292 A JP 2012-15557 A International Publication No. 2009/145118

In the single-core bidirectional wavelength demultiplexing node disclosed in Patent Document 1, a demultiplexer that interleaves adjacent wavelength channels requires steep filter characteristics when the wavelength interval is narrowed in order to increase the frequency density. Cost. Moreover, although the Example which arrange | positions an optical fiber amplifier for every individual transponder is shown, it becomes high cost compared with the case where an optical fiber amplifier is arranged collectively in a transmission line.
Accordingly, an object of the present invention is to reduce the cost of an optical demultiplexing transmission apparatus.

  An optical demultiplexing / transmitting apparatus according to the present invention includes wavelength band multiplexing means for multiplexing optical signals of first and second wavelength groups having different wavelengths transmitted from a first route and a second route, respectively. The optical signal of a predetermined wavelength among the multiplexed signals by the wavelength band multiplexing means is optically branched / inserted, and the signal is input / output to / from an external device, and the optical signal other than the predetermined wavelength is allowed to pass through. Wavelength for separating the wavelength of the optical signal output from the optical add / drop means and the optical signal output from the optical add / drop means and transmitting the separated first and second optical signals to either the first path or the second path Band separation means.

  The optical demultiplexing transmission method according to the present invention multiplexes the optical signals of the first and second wavelength groups having different wavelengths transmitted from the first route and the second route, and the wavelength band multiplexing means. Optically branching / inserting an optical signal having a predetermined wavelength among the multiplexed signals, inputting / outputting the signal to / from an external device, and passing an optical signal other than the predetermined wavelength, from the optical add / drop means The output optical signal is wavelength-separated, and the separated first and second optical signals are transmitted to either the first route or the second route.

  An optical demultiplexing transmission control system according to the present invention is an optical demultiplexing transmission control system including at least one optical demultiplexing transmission apparatus and a network control apparatus, and the optical demultiplexing transmission apparatus includes a first path, Wavelength band multiplexing means for multiplexing optical signals of the first and second wavelength groups having different wavelengths transmitted from the second path, and a predetermined wavelength among the multiplexed signals by the wavelength band multiplexing means The optical signal is optically branched / added, and the signal is input / output to / from an external device via the transponder, and the optical signal is inserted from the optical signal adding / dropping device that passes an optical signal other than the predetermined wavelength. Wavelength separation means for wavelength-separating the separated optical signal and transmitting the separated first and second optical signals to either the first route or the second route, and the network control device The network control device operates so that the optical add / drop unit of the optical demultiplexing / transmitting device performs optical add / drop of an optical signal of a predetermined wavelength, and a transponder inputs / outputs an optical signal of a predetermined wavelength. Control.

  An optical demultiplexing transmission apparatus, a control method, and an optical demultiplexing transmission control system with reduced costs are provided.

1 is a configuration diagram of an optical demultiplexing transmission apparatus according to a first embodiment; FIG. 6 is a diagram illustrating a configuration example of a linear topology of single-fiber bidirectional communication including one optical demultiplexing / transmitting device according to a second embodiment; It is a figure which shows the structural example of the linear topology of 1 fiber bidirectional | two-way communication provided with the two optical demultiplexing transmission apparatus concerning Embodiment 2. FIG. FIG. 10 is a diagram showing a control flow of the wavelength division multiplexing communication system according to the second exemplary embodiment. It is a figure which shows the structural example of the linear topology of the 2 core bidirectional | two-way communication concerning this Embodiment 3. FIG. It is a figure which shows the structural example of the ring topology of 1 core bidirectional | two-way communication concerning Embodiment 4. FIG. FIG. 10 is a diagram illustrating a configuration example of a ring topology of two-core bidirectional communication according to the fifth embodiment. 3 is a configuration example of an OADM function unit according to a second exemplary embodiment; 10 is a configuration example of an OADM function unit according to a sixth embodiment; 10 is a configuration example of an OADM function unit according to a sixth embodiment; 10 is a configuration example of an OADM function unit according to a sixth embodiment; 10 is a configuration example of an OADM function unit according to a sixth embodiment; 1 is a configuration example for explaining a system configuration according to a premise example of an embodiment; 1 is a configuration example for explaining a system configuration according to a premise example of an embodiment; It is a structural example of the OADM function part concerning the premise example of embodiment. It is a structural example of the OADM function part concerning the premise example of embodiment. It is a structural example of the OADM function part concerning the premise example of embodiment. It is a structural example of the OADM function part concerning the premise example of embodiment. It is a structural example of the OADM function part concerning the premise example of embodiment.

(Premise example of embodiment)
FIG. 13 shows an example of a one-way bidirectional wavelength division multiplexing communication system that can be recalled by a combination of related technologies. In FIG. 13, uplink and downlink communications are assigned to each of a short wavelength band and a long wavelength band or a plurality of wavelength bands within a specific wavelength band (C-band, L-band, etc.), and transmission path light is transmitted. One fiber bidirectional in the fiber 0613 is separated into a short wavelength band and a long wavelength band by the WDM coupler 0605 in the OADM optical multiplexing / demultiplexing transmission device 0612, and wavelength path demultiplexing (OADM) or transmission (without OADM as it is, OADM as it is) After setting the wavelength path (passing through the node), it is multiplexed again by the WDM coupler 0605 and transmitted in one-fiber bidirectional.

  The optical fiber amplifier 0604, the OADM unit 0606, and the DCM (Dispersion Compensation Module) 0603 in the OADM optical demultiplexing / transmission apparatus 0612 normally have components with specifications that cover all the bands of the wavelength bands assigned to the upstream and downstream. Although applied, the wavelength division multiplexed signal to which the component is input is only one of the short wavelength band and the long wavelength band, and the practical use efficiency of the component is 1/2 that of the two-core bidirectional system configuration in FIG. There is a problem.

  FIG. 14 shows an example of a two-core bidirectional wavelength division multiplexing communication system. 15 to 19 are typical examples of the OADM function unit of the optical demultiplexing transmission apparatus applied to FIG. 13 or FIG.

  In such an optical demultiplexing / transmitting apparatus, the optical fiber amplifier, the OADM function unit, and the DCM function unit are separately used in the upstream direction and the downstream direction, and there is a problem that the wavelength path utilization efficiency is poor. Since the OADM function unit is generally expensive and often has a large volume, there is a problem in that the cost of the optical demultiplexing transmission apparatus is increased and the volume is increased. In addition, since the OADM function unit provided in the optical demultiplexing transmission apparatus has different functions depending on the scene in which it is used, the size and cost are adjusted according to the required conditions, and the optimum optical There is a desire to use a demultiplexing transmission apparatus. Further, when a part of the optical demultiplexing transmission apparatus fails, the optical signal cannot be transmitted to another optical demultiplexing transmission apparatus connected via the optical demultiplexing transmission apparatus in which the failure has occurred. There is.

(Embodiment 1)
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating an optical demultiplexing transmission apparatus. The optical demultiplexing / transmission apparatus 0112 includes a multiplexing WDM coupler 0011, an OADM function unit (wavelength path selection switching means) 0012, and a demultiplexing WDM coupler 0013.

The multiplexing WDM coupler 0011 is wavelength band multiplexing means for multiplexing and outputting optical signals input from two different paths. More specifically, the multiplexing WDM coupler 0011 multiplexes the optical signal input from the first path and the optical signal input from the second path. The optical signal input from the first route and the optical signal input from the second route have different wavelengths. For example, the first wavelength input from the first path is a long wavelength, and the second wavelength input from the second path is a short wavelength.
The multiplexing WDM coupler 0011 outputs the multiplexed optical signal to the OADM function unit 0012.

The OADM function unit 0012 performs optical branching and insertion of the input optical signal. A client device (external device: not shown) is connected to the OADM function unit 0012 via a multiplexing WDM coupler 0011, a demultiplexing WDM coupler 0013, and a transponder. The OADM function unit 0012 branches the optical signal input from the multiplexing WDM coupler 0011 and outputs the branched optical signal to the demultiplexing WDM coupler 0013 and the client device. The OADM function unit 0012 inserts a signal input from the client device via the transponder into an optical signal transmitted from the multiplexing WDM coupler 0011 to the demultiplexing WDM coupler 0013.
More specifically, the OADM function unit 0012 controls the optical signal having the wavelength to be output to the client device when the optical signal is branched from being output from the multiplexing WDM coupler 0011 to the demultiplexing WDM coupler 0013. The OADM function unit 0012 controls so that an optical signal having a wavelength input from the client apparatus is not output from the multiplexing WDM coupler 0011 to the demultiplexing WDM coupler 0013 when the optical signal is inserted.
The transponder will be described in detail in the second embodiment.

  The demultiplexing WDM coupler 0013 is wavelength band separation means for branching and outputting the optical signal input from the OADM function unit 0012. More specifically, the demultiplexing WDM coupler 0013 outputs an optical signal to each of the first route and the second route. Here, the wavelength of the optical signal output from the demultiplexing WDM coupler 0013 to the first path and the second path is demultiplexed into different sub-wavelength bands. Typically, the demultiplexing WDM coupler 0013 outputs an optical signal having the same wavelength as that input to the multiplexing WDM coupler 0011 from the first path to the second path. The demultiplexing WDM coupler 0013 outputs an optical signal having the same wavelength as the wavelength input from the second path to the multiplexing WDM coupler 0011 to the first path.

  Accordingly, the function of the OADM function unit in the optical demultiplexing transmission apparatus can be shared by the optical signal input from the first route and the optical signal input from the second route. Therefore, the cost of the optical demultiplexing transmission apparatus can be reduced.

(Embodiment 2)
2 and 3 are examples in which a network system is constructed with a linear topology. Specifically, FIG. 2 is an example provided with one optical demultiplexing / transmitting device (node device), and FIG. 3 is an example provided with two optical demultiplexing / transmitting devices. Hereinafter, a description will be given with reference to FIG. 2 and 3, the left side is described as West and the right side as East. The direction from the West side to the East side of the optical demultiplexing / transmission apparatus 0112 is defined as a first route (or downlink direction), and the direction from the East side to the West side is defined as a second route (or uplink direction).

  The wavelength division multiplexing optical communication network system includes a WDM terminal apparatus 0111, an optical demultiplexing transmission apparatus 0112, and a network control apparatus 0114. The WDM terminal apparatus 0111 and the optical demultiplexing / transmission apparatus 0112 are connected to the network control apparatus 0114 and receive setting information related to wavelength path setting from the network control apparatus 0114. One WDM terminal station device 0111 is provided on the west side and the east side of the optical demultiplexing / transmitting device 0112, which are respectively referred to as a WDM terminal station device 0111A and a WDM terminal station device 0111B. The WDM terminal station apparatus 0111A and the optical demultiplexing / transmission apparatus 0112, and the optical demultiplexing / transmission apparatus 0112 and the WDM terminal station apparatus 0111B are connected by one transmission line optical fiber 0113, respectively. In other words, the wavelength division multiplexing optical communication network system performs one-core bidirectional communication.

  The WDM terminal equipment 0111 includes a transponder 0101, a wavelength demultiplexing device 0102, a first DCM 0103A (dispersion compensation module), a second DCM 0103B, a first optical fiber amplifier 0104A, 2 optical fiber amplifiers 0104B, a first WDM coupler 0105A, and a second WDM coupler 0105B.

  The transponder 0101 provides communication between client apparatuses (not shown) connected to the WDM terminal apparatus 0111. The transponder 0101 has a full tunable function capable of selecting all wavelengths (WDM wavelength channels) within a specific wavelength band (C-band, L-band, etc.). More specifically, the transponder 0101 has an OTN (Optical Transport Network) frame generation termination function and a bit rate that comply with the ITU-T standard, and the wavelength of the WDM line optical output signal is defined in the standard. It has a function that can set any of a plurality of equally spaced frequencies. Here, a transponder with C-band as a specification is applied as OTU2 (bit rate = 10.709 Gbps), a frequency interval of 100 GHz, a WDM channel number of 40 channels, and a WDM band. In this embodiment, in order to realize one-core bidirectional transmission, the band of 100 GHz and 40 channels are divided into 20 channels of the short wavelength band and 20 channels of the super wavelength band, and the long wavelength band is optically multiplexed. Assume that the short wavelength band is assigned to the link setting in the direction from the east side device to the west side device in the link setting in the direction from the west side device to the east side device. In other words, the long wavelength band is assigned to the link setting in the direction from the WDM terminal station device 0111A to the WDM terminal station device 0111B, and the short wavelength band is assigned to the link setting in the direction from the WDM terminal station device 0111B to the WDM terminal station device 0111A.

  The transponder 0101 selects a wavelength channel with respect to the wavelength demultiplexing device 0102 and performs input / output. The transponder of the WDM terminal station device 0111A provided on the west side of the optical demultiplexing transmission device 0112 is a transponder 0101X, and the transponder of the WDM terminal device 0111B provided on the west side of the optical demultiplexing transmission device 0112 is a transponder 0101Z. And

  The wavelength demultiplexing device 0102 multiplexes the wavelength of the signal input from the transponder 0101. More specifically, the wavelength multiplexing / demultiplexing device 0102 has 40 port input / output ports for individually inputting / outputting optical signals of 40 channels at intervals of 100 GHz, and wavelength-multiplexes and outputs these optical signals. Or an uplink port for inputting a multiplexed signal for wavelength separation into a plurality of optical signals. The wavelength demultiplexing device 0102 outputs the multiplexed signal to the first WDM coupler 0105A. The wavelength demultiplexing device 0102 demultiplexes the multiplexed signal input from the first WDM coupler 0105A and outputs the demultiplexed signal to the transponder 0101X.

The first DCM 0103A is a module containing a dispersion compensating fiber for preventing deterioration in transmission quality. More specifically, the first DCM 0103A performs dispersion compensation in order to optimize the residual dispersion value generated at the transponder receiving end due to the positive chromatic dispersion accumulated by the transmission line optical fiber 0113. The first DCM 0103A uses DCF (Dispersion Compansation Fiber) or FBG (Fiber Bragg Grating), and the dispersion compensation amount is set so that the bit error rate at the receiving end is not more than a specified value.
The first DCM 0103A performs dispersion compensation on the signal input from the first WDM coupler 0105A and outputs the signal to the first optical fiber amplifier 0104A.

  The second DCM 0103B is a module containing a dispersion compensating fiber for preventing deterioration of transmission quality. The second DCM 0103B performs dispersion compensation on the signal input from the second optical fiber amplifier 0104B and outputs the signal to the first WDM coupler 0105A. Typically, the second DCM 0103B is the same as the first DCM 0103A, but is not limited thereto.

The first optical fiber amplifier 0104A is a module having a function of amplifying the attenuated signal. Typically, the optical fiber amplifier 0104A uses an EDF (Erbium Dopoed Fiber) as a gain medium, excites ionized Erbium added to the optical fiber by a pumping semiconductor laser, amplifies the input signal light, and outputs an output optical signal. Output as. The amplification gain, the input optical signal power, the output optical signal power, etc. of the optical fiber amplifier 0104A are the optical power level diagram determined by the loss of the passive optical device other than the transponder 0101 and the transmission line optical fiber. The power level and OSNR (Optical Signal to Noise Ratio) are determined so as to satisfy predetermined characteristics.
The first optical fiber amplifier 0104A amplifies the signal input from the first DCM 0103A and outputs the amplified signal to the second WDM coupler 0105B.

  The second optical fiber amplifier 0104B is a module having a function of amplifying the attenuated signal. The second optical fiber amplifier 0104B amplifies the signal input from the second WDM coupler 0105B and outputs the amplified signal to the second DCM 0103B. Typically, the second optical fiber amplifier 0104B is similar to the first optical fiber amplifier 0104A, but is not limited thereto.

  The first WDM coupler 0105A discriminates between the long wavelength band and the short wavelength band. For example, as the first WDM coupler 0105A, an optical fiber fused WDM coupler having a function of multiplexing or demultiplexing every 20 channels of the short wavelength band and 20 channels of the long wavelength band in the C-band is applied. The first WDM coupler 0105A outputs the signal input from the wavelength demultiplexing device 0102 to the first DCM 0103A. Also, the first WDM coupler 0105A outputs the signal input from the second optical fiber amplifier 0104B to the wavelength demultiplexing device 0102.

  The second WDM coupler 0105B discriminates between the long wavelength band and the short wavelength band. More specifically, the second WDM coupler 0105B outputs the signal input from the first optical fiber amplifier 0104A to the optical demultiplexing / transmitting device 0112 via the transmission line optical fiber 0113. The second WDM coupler 0105B outputs the signal input from the optical demultiplexing / transmission apparatus 0112 via the transmission line optical fiber 0113 to the second DCM 0103B. Typically, the second WDM coupler 0105B is the same as the first WDM coupler 0105A, but is not limited thereto.

  As the transmission line optical fiber 0113, SSMF (Standard Single Mode Fiber) is typically used. A transmission line optical fiber 0113 connected between the WDM terminal station 0111A and the optical demultiplexing / transmission apparatus 0112 is connected between the first optical cable, the optical demultiplexing / transmission apparatus 0112, and the WDM terminal station 0111B. The transmission line optical fiber 0113 is a second optical cable.

  The optical demultiplexing transmission device 0112 includes a transponder 0101Y, a third DCM 0103C, a third WDM coupler 0105C, a multiplexing WDM coupler 0107A, a demultiplexing WDM coupler 0107B, a third optical fiber amplifier 0108A, And a fourth optical fiber amplifier 0108B and an OADM function unit 0109. Here, typically, the optical demultiplexing / transmitting device 0112 is different from the optical demultiplexing / transmitting device 0001 shown in the first embodiment in the third DCM 0103C, the third WDM coupler 0105C, and the third optical fiber amplifier. 0108A and a fourth optical fiber amplifier 0108B are added.

  The transponder 0101Y provides communication between client apparatuses (not shown) connected to the optical demultiplexing / transmission apparatus 0112. The transponder 0101Y inputs / outputs a wavelength signal to / from the OADM function unit 0109.

  The third WDM coupler 0105C discriminates between the long wavelength band and the short wavelength band. More specifically, the third WDM coupler 0105C receives the signal input from the demultiplexing WDM coupler 0107B via the transmission line optical fiber 0113 and is provided at the WDM end provided on the west side of the optical demultiplexing transmission device 0112. Output to the station device 0111A. The third WDM coupler 0105C receives a signal input from the second WDM coupler 0105B of the WDM terminal device 0111B provided on the west side of the optical demultiplexing transmission device 0112 via the transmission line optical fiber 0113. The signal is output to the multiplexing WDM coupler 0107A. Typically, the third WDM coupler 0105C is similar to the first WDM coupler 0105A, but is not limited thereto. Hereinafter, the third WDM coupler 0105C may be referred to as a first transmission wavelength division multiplex coupler.

  The fourth WDM coupler 0105D discriminates between the long wavelength band and the short wavelength band. More specifically, the fourth WDM coupler 0105D receives the signal input from the demultiplexing WDM coupler 0107B via the transmission line optical fiber 0113 and is provided on the east end of the optical demultiplexing / transmission apparatus 0112. Output to the station apparatus 0111B. The fourth WDM coupler 0105D receives a signal input from the second WDM coupler 0105B of the WDM terminal equipment 0111B provided on the east side of the optical demultiplexing transmission device 0112 via the transmission line optical fiber 0113. The signal is output to the multiplexing WDM coupler 0107A. Typically, the fourth WDM coupler 0105D is the same as the first WDM coupler 0105A, but is not limited thereto. Hereinafter, the fourth WDM coupler 0105D may be referred to as a second transmission wavelength division multiplex coupler.

  The multiplexing WDM coupler 0107A is a wavelength band multiplexing unit that synthesizes and outputs input signals of respective wavelengths. Specifically, the multiplexing WDM coupler 0107A includes the optical signal of the first wavelength group input from the third WDM coupler 0105C and the optical signal of the second wavelength group input from the fourth WDM coupler 0105D. The signals are combined and output to the third optical fiber amplifier 0108A. Typically, the multiplexing WDM coupler 0107A is the same as the first WDM coupler 0105A, but is not limited thereto.

  The third optical fiber amplifier 0108A is a module having a function of amplifying the attenuated signal. The third optical fiber amplifier 0108A amplifies the signal input from the multiplexing WDM coupler 0107A and outputs the amplified signal to the third DCM 0103C. Typically, the third optical fiber amplifier 0108A is similar to the first optical fiber amplifier 0104A, but is not limited thereto.

  The third DCM 0103C is a module containing a dispersion compensating fiber for preventing transmission quality deterioration due to wavelength dispersion. The third DCM 0103C performs dispersion compensation on the signal input from the third optical fiber amplifier 0108A and outputs the signal to the OADM function unit 0109. Typically, the third DCM 0103C is the same as the first DCM 0103A, but is not limited thereto.

The OADM function unit 109 includes an optical add / drop unit. Specifically, the OADM function unit 0109 inputs a signal from the third optical fiber amplifier 0108A, and the OADM function unit 0109 inputs / outputs a signal to / from the transponder 0101Y. The OADM function unit 0109 outputs a signal to the fourth optical fiber amplifier 0108B. FIG. 8 is a configuration example of the OADM function unit 0109.
The OADM function unit 0109 includes a 2 × 1 wavelength selective switch 0901B, an optical coupler 1301, a DCM 0603, an optical fiber amplifier 0604A, an optical fiber amplifier 0604B, and a wavelength multiplexing / demultiplexing device 1302. Further, the OADM function unit 0109 has a node control circuit 0811 outside. In FIG. 8, optical signals having a long wavelength are displayed in red-band and signals having a short wavelength are displayed in blue-band.

  The DCM 0603 and the optical fiber amplifiers 0604A and 0604B are the same as the third DCM 0103C, the third optical fiber amplifier 0108A, and the fourth optical fiber amplifier 0108B described above.

  The 2 × 1 wavelength selective switch 0901B includes two input ports and one output port, and has a function of outputting an arbitrary wavelength channel input to an arbitrary input port to the output port. For example, the 2 × 1 wavelength selective switch 0901B includes a MEMS (Micro Electro Mechanical System) switch and a diffraction grating (grating). The 2 × 1 wavelength selective switch 0901B divides the WDM signal light input from the input port by irradiating the diffraction grating and separates the WDM signal light by using the MEMS mirror for each specific frequency component. Focus on the optical fiber.

  The optical coupler 1301 has one input port and two output ports, and the optical power of the ratio α (0 <α <1) is set to one output port over the entire operating wavelength band for the input wavelength channel. It has a function of demultiplexing and outputting optical power of -α to the other output port.

  The wavelength multiplexing / demultiplexing device 1302 includes one port for inputting / outputting wavelength multiplexed signals, and ports for inputting / outputting individual wavelength signals that have been separated, for the total number of wavelength channels in the operating wavelength band. The wavelength demultiplexing device 1302 is disposed between the optical coupler 1301 or the 2 × 1 wavelength selective switch 0901B and the transponder 0601, and has a wavelength channel demultiplexing function in the operation wavelength band. A device provided between the optical coupler 1301 and the transponder 0601 is a wavelength demultiplexing device 1302A, and a device provided between the 2 × 1 wavelength selective switch 0901B and the transponder 0601 is a wavelength demultiplexing device 1302B. In other words, a device that outputs a signal to the transponder 0601 is a wavelength demultiplexing device 1302A, and a device that inputs a signal from the transponder 0601 is a wavelength demultiplexing device 1302B. The wavelength demultiplexing device 1302 has the same function as that used in the WDM terminal equipment, but both short wavelength band and long wavelength band optical signals are input from the wavelength multiplexing port and output from the wavelength demultiplexing port. Therefore, it differs from the application form in the WDM terminal station device in the input / output direction. The transponder 0601 is the same as the transponder 0101Y.

  The node control circuit 0811 is connected to the transponder 0601 and the 2 × 1 wavelength selective switch 0901B, and controls the operation. Typically, the node control circuit 0811 controls the operations of the transponder 0601 and the 2 × 1 wavelength selective switch 0901B based on a control signal from the network control device 0114. For example, the node control circuit 0811 controls the transponder 0601 to input / output an optical signal having a specific wavelength. The node control circuit 0811 also passes or blocks the optical signal input from the DCM 0603 and transmitted through the optical coupler 1301 in the 2 × 1 wavelength selective switch 0901B for the specific wavelength, and from the wavelength demultiplexing device 1302B. Controls the passage or blocking of the input optical signal.

  The fourth optical fiber amplifier 0108B is a module having a function of amplifying the attenuated signal. The fourth optical fiber amplifier 0108B amplifies the signal input from the OADM function unit 0109 and outputs the amplified signal to the demultiplexing WDM coupler 0107B. Typically, the fourth optical fiber amplifier 0108B is similar to the first optical fiber amplifier 0104A, but is not limited thereto.

  The demultiplexing WDM coupler 0107B receives a signal from the fourth optical fiber amplifier 0108B. The demultiplexing WDM coupler 0107B is a wavelength band separation unit that separates an input signal based on a wavelength. More specifically, the demultiplexing WDM coupler 0107B refers to the wavelength of the signal, outputs a signal output to the west side of the optical demultiplexing transmission device 0112 to the third WDM coupler 0105C, and performs optical demultiplexing. The signal output to the east side of the transmission device 0112 is output to the fourth WDM coupler 0105D. Typically, the demultiplexing WDM coupler 0107B is the same as the first WDM coupler 0105A, but is not limited thereto.

  Next, the operation of the wavelength division multiplexing optical communication network system will be described with reference to the drawings. First, the operation of the network control device 0114 will be described. FIG. 4 is a control flow of the wavelength division multiplexing optical communication network system. FIG. 4 shows a control flow of signal transmission from the transponder 0101X of the WDM terminal apparatus 0111A to the transponder 0101Y of the optical demultiplexing transmission apparatus 0112.

  The network control device 0114 receives a wavelength path setting request from an upper service layer or the like, and sets the WDM terminal station device 0111 or the optical demultiplexing / transmission device 0112 as a wavelength path end point to be controlled in order to establish the requested wavelength path. Specify (step S1).

  The network control device 0114 transmits a wavelength path setting command to the identified WDM terminal device 0111 or the optical demultiplexing / transmitting device 0112. The network control device 0114 transmits a setting command so as to transmit the newly set wavelength path at the set wavelength to all the optical demultiplexing / transmitting devices 0112 on the wavelength path route (step S2).

  Here, it is assumed that the resource status of the transponder and wavelength channel of each device is managed as resource information in the network control device 0114, each terminal device, or the optical demultiplexing transmission device. Further, in response to a wavelength path setting request from an upper service layer or the like, the network control device 0114 refers to resource information to select an appropriate wavelength and transponder, and a wavelength path setting command is related to the wavelength path setting. It is assumed that the data is transmitted to the device and the optical demultiplexing transmission device. However, the above assumptions are not meant to be exhaustive of the present invention.

  Next, the operation of setting the wavelength path P1 between the transponder 0101X of the WDM terminal station apparatus 0111A and the transponder 0101Y of the optical demultiplexing transmission apparatus 0112 will be described.

  The network control device 0114 receives the setting request for the wavelength path P1 from the upper service layer, and transmits the transmission signal wavelengths of the transponder 0101X and the transponder 0101Y to the WDM terminal station device 0111A and the optical demultiplexing transmission device 0112, respectively, and if necessary. Then, a setting command for setting the reception signal wavelength is transmitted (step S3). For the transponder 0101X, the wavelength λR1 is set for the transmission wavelength of the link from the WDM terminal apparatus 0111A to the optical demultiplexing / transmitting apparatus 0112, and the link from the optical demultiplexing / transmitting apparatus 0112 direction to the WDM terminal apparatus 0111A is set. A wavelength λB1 is set for the reception wavelength. For the transponder 0101Y, the wavelength λB1 is set for the transmission wavelength of the link from the optical demultiplexing / transmission apparatus 0112 direction to the WDM terminal station apparatus 0111A, and the link of the link from the WDM terminal apparatus 0111A to the optical demultiplexing transmission apparatus 0112 direction is set. A wavelength λR1 is set for the reception wavelength. If the setting of the reception wavelength is unnecessary, it may be omitted.

  First, regarding the wavelength path P1, a link (dotted arrow in FIG. 2) from the WDM terminal apparatus 0111A to the optical demultiplexing / transmission apparatus 0112 will be described.

  The wavelength demultiplexing device 0102 wavelength-multiplexes the optical signal having the wavelength λR1 transmitted from the transponder 0101X, and outputs the optical signal to the first WDM coupler 0105A (step S4). Here, the wavelength λR1 is a long wavelength band.

The first WDM coupler 0105A performs multiplexing / demultiplexing of the long wavelength band and the short wavelength band (step S5). In other words, the first WDM coupler 0105A performs multiplexing / demultiplexing of the long wavelength band signal output from the wavelength demultiplexing device 0102 and the short wavelength band signal input from the second DCM 0103B.
Here, the first WDM coupler 0105A outputs the optical signal having the wavelength λR1 to the second WDM coupler 0105B via the first DCM 0103A and the first optical fiber amplifier 0104A.

The second WDM coupler 0105B performs multiplexing / demultiplexing of the long wavelength band and the short wavelength band (step S6). In other words, the second WDM coupler 0105B performs demultiplexing of the long wavelength band signal input from the first optical fiber amplifier 0104A and the short wavelength band signal input from the third WDM coupler 0105C. .
Here, the second WDM coupler 0105B outputs the optical signal having the wavelength λR1 to the third WDM coupler 0105C of the optical demultiplexing transmission apparatus 0112 via the transmission line optical fiber 0113.

The third WDM coupler 0105C performs multiplexing / demultiplexing of the long wavelength band and the short wavelength band (step S6). In other words, the third WDM coupler 0105C performs multiplexing / demultiplexing of the long wavelength band signal input from the second WDM coupler 0105B and the short wavelength band signal input from the demultiplexing WDM coupler 0107B.
Here, third WDM coupler 0105C separates the wavelength band of the optical signal having wavelength λR1 after transmission and outputs the result to multiplexing WDM coupler 0107A.

The multiplexing WDM coupler 0107A multiplexes the long wavelength band optical signal input from the third WDM coupler 0105C and the short wavelength band optical signal on the opposite side (step S8). The multiplexing WDM coupler 0107A outputs the combined signal to the OADM function unit 0109 via the third optical fiber amplifier 0108A and the third DCM 103C.
The DCM 0103 is mounted on one or both of the WDM terminal station device 0111 and the optical demultiplexing transmission device 0112, compensates the chromatic dispersion of the transmission line optical fiber 0113, and sets an appropriate residual dispersion value at the transponder receiving end. The chromatic dispersion compensation amount of DCM is set so that

  Next, the operation of the OADM function unit 0109 will be described with reference to FIG.

  In the optical coupler 1301, the OADM function unit 0109 inputs the optical power with the ratio α (0 <α <1) to the wavelength demultiplexing device 1302A, and inputs the optical power with the ratio 1-α to the 2 × 1 wavelength selective switch 0901B. (Step S9). α is set within the above range in consideration of the network scale and optical loss budget.

  The transponder 0101Y receives the optical signal having the wavelength λR1 input to the wavelength demultiplexing device 1302A (step S10).

  On the other hand, the node control circuit 0811 performs control so that the optical signal of the wavelength λR1 input to the 2 × 1 wavelength selective switch 0901B is blocked (terminated) from being output to the output port in the 2 × 1 wavelength selective switch 0901B. (Step S11).

  Next, regarding the wavelength path P1, a link (solid arrow in FIG. 2) from the optical demultiplexing / transmitting device 0112 to the WDM terminal device 0111A will be described.

In the OADM function unit 0109, the wavelength multiplexing / demultiplexing device 1302B multiplexes the optical signal of wavelength λB1 transmitted from the transponder 0101Y together with the transmission optical signals of other transponders, and outputs the multiplexed signal to the 2 × 1 wavelength selective switch 0901B.
The node control circuit 0811 controls the 2 × 1 wavelength selective switch 0901B to output the optical signal having the wavelength λB1 input from the wavelength demultiplexing device 1302B to the output port. The wavelength λB1 is a short wavelength band.

  The 2 × 1 wavelength selective switch 0901B outputs the optical signal having the wavelength λB1 to the demultiplexing WDM coupler 0107B via the fourth optical fiber amplifier 0108B.

  The demultiplexing WDM coupler 0107B demultiplexes the optical signals in the long wavelength band and the short wavelength band. Here, the demultiplexing WDM coupler 0107B outputs a signal of the wavelength λB1, which is a short wavelength band, to the third WDM coupler 0105C.

The third WDM coupler 0105C demultiplexes the optical signals in the long wavelength band and the short wavelength band. In other words, the third WDM coupler 0105C performs multiplexing / demultiplexing of the short wavelength band signal input from the demultiplexing WDM coupler 0107B and the long wavelength band signal input from the second WDM coupler 0105B.
Here, the third WDM coupler 0105C outputs a signal of wavelength λB1 to the second WDM coupler 0105B via the transmission line optical fiber 0113.

The second WDM coupler 0105B demultiplexes the long wavelength band and short wavelength band optical signals. In other words, the second WDM coupler 0105B performs multiplexing / demultiplexing of the short wavelength band signal input from the third WDM coupler 0105C and the long wavelength band signal input from the first optical fiber amplifier 0104A. .
Here, the second WDM coupler 0105B outputs a signal of wavelength λB1 to the first WDM coupler 0105A via the second optical fiber amplifier 0104B and the second DCM 0103B.

The first WDM coupler 0105A demultiplexes the optical signals in the long wavelength band and the short wavelength band. In other words, the first WDM coupler 0105A performs multiplexing / demultiplexing of the short wavelength band signal input from the DCM 0103B and the long wavelength band signal input from the wavelength demultiplexing device 0102.
Here, the first WDM coupler 0105A outputs the signal of wavelength λB1 to the transponder 0101X via the wavelength demultiplexing device 0102.

  Accordingly, between the WDM terminal station device 0111A and the optical demultiplexing / transmitting device 0112, the link from the WDM terminal station device 0111A of the wavelength λR1 to the optical demultiplexing / transmitting device 0112 and the optical demultiplexing / transmitting device 0112 of the wavelength λB1 to the WDM A wavelength path P1 constituted by a link in the direction of the terminal device 0111A is established.

  Next, the operation of setting the wavelength path P2 between the transponder 0101X of the WDM terminal station device 0111A and the transponder 0101Z of the WDM terminal device 0111B will be described below.

  The network control device 0114 receives the setting request for the wavelength path P2 from the upper service layer, and transmits the transponder X and the transponder Z to the WDM terminal station device 0111A, the optical demultiplexing transmission device 0112, and the WDM terminal device 0111B, respectively. A setting command for setting the signal wavelength and, if necessary, the reception signal wavelength is transmitted. For the transponder X, the wavelength λR2 is set for the transmission wavelength of the WDM terminal station device 0111A to the WDM terminal station device 0111B, and the wavelength λB2 is set for the reception wavelength of the WDM terminal device device 0111B to the WDM terminal station device 0111A. Set. For the transponder Z, the wavelength λB2 is set for the transmission wavelength from the WDM terminal station device 0111B to the WDM terminal station device 0111A, and the wavelength λR2 is set for the reception wavelength from the WDM terminal device 0111A to the WDM terminal station device 0111B. Set. If the setting of the reception wavelength is unnecessary, it may be omitted.

  First, regarding the wavelength path P2, a link from the WDM terminal station device 0111A to the WDM terminal station device 0111B, that is, a link from the west side to the east side of the optical demultiplexing transmission device 0112 (dotted arrow in FIG. 3) will be described. .

  The wavelength demultiplexing device 0102 wavelength-multiplexes the optical signal having the wavelength λR2 transmitted from the transponder 0101X, and outputs it to the first WDM coupler 0105A. Here, the wavelength λR2 is a long wavelength band.

  The first WDM coupler 0105A performs multiplexing / demultiplexing of the long wavelength band and the short wavelength band. Here, the first WDM coupler 0105A outputs the optical signal having the wavelength λR2 to the second WDM coupler 0105B via the first DCM 0103A and the first optical fiber amplifier 0104A.

  The second WDM coupler 0105B performs multiplexing / demultiplexing of the long wavelength band and the short wavelength band. Here, the second WDM coupler 0105B outputs the optical signal having the wavelength λR2 to the third WDM coupler 0105C of the optical demultiplexing transmission apparatus 0112 via the transmission line optical fiber 0113.

  The third WDM coupler 0105C performs multiplexing / demultiplexing of the long wavelength band and the short wavelength band. Here, third WDM coupler 0105C separates the wavelength band of the optical signal having wavelength λR2 after transmission and outputs it to multiplexing WDM coupler 0107A.

  The multiplexing WDM coupler 0107A multiplexes the long-wavelength optical signal input from the third WDM coupler 0105C and the short-wavelength optical signal on the opposite side. The multiplexing WDM coupler 0107A outputs the combined signal to the OADM function unit 0109 via the third optical fiber amplifier 0108A and the third DCM 103C.

  In the optical coupler 1301, the OADM function unit 0109 inputs the optical power with the ratio α (0 <α <1) to the wavelength demultiplexing device 1302A, and inputs the optical power with the ratio 1-α to the 2 × 1 wavelength selective switch 0901B. To do.

  The node control circuit 0811 performs control so that the optical signal having the wavelength λR2 input to the 2 × 1 wavelength selective switch 0901B is output (transmitted) to the output port in the 2 × 1 wavelength selective switch 0901B. As a result, the 2 × 1 wavelength selective switch 0901B outputs the optical signal including the wavelength λR2 to the demultiplexing WDM coupler 0107B via the fourth optical fiber amplifier 0108B.

  The demultiplexing WDM coupler 0107B demultiplexes the optical signals in the long wavelength band and the short wavelength band. Here, the demultiplexing WDM coupler 0107B outputs a signal of the wavelength λR2 which is a long wavelength band to the fourth WDM coupler 0105D.

  The fourth WDM coupler 0105D demultiplexes the long wavelength band and short wavelength band optical signals. Here, the fourth WDM coupler 0105D outputs the signal having the wavelength λR2 to the second WDM coupler 0105B of the WDM terminal device 0111B via the transmission line optical fiber 0113.

  The second WDM coupler 0105B of the WDM terminal device 0111B demultiplexes the long wavelength band and short wavelength band optical signals. Here, in the WDM terminal apparatus 0111B, the second WDM coupler 0105B outputs a signal of wavelength λB1 to the first WDM coupler 0105A via the second optical fiber amplifier 0104B and the second DCM 0103B.

  The first WDM coupler 0105A of the WDM terminal equipment 0111B demultiplexes the long wavelength band and short wavelength band optical signals. Here, in the WDM terminal apparatus 0111B, the first WDM coupler 0105A outputs a signal of wavelength λR2 to the transponder 0101Z via the wavelength demultiplexing device 0102.

  Regarding the wavelength path P2, a link from the WDM terminal station device 0111B to the WDM terminal station device 0111A, that is, a link in the East → West direction is established by the same setting as described above. Therefore, the direction link (West → East direction link) of the wavelength λR2 from the WDM terminal station device 0111A to the WDM terminal station device 0111B and the direction link (East → East direction link) of the wavelength λB2 from the WDM terminal station device 0111B to the WDM terminal station device 0111A. A wavelength path P2 configured by a West direction link) is established.

As a result, the optical fiber amplifier, the OADM function unit, and the DCM function unit in the optical demultiplexing transmission apparatus can be shared with respect to the short wavelength band (upstream) and the long wavelength band (downstream). Can be maximized. Therefore, the cost of the optical demultiplexing transmission apparatus can be reduced.
More specifically, as compared with a configuration in which a functional block corresponding to the OADM function unit 0109 is provided for each of the two directions, only the OADM function unit for one direction has a short wavelength band and a long wavelength band. Therefore, the device cost of the OADM function unit can be reduced to ½. Therefore, it is possible to reduce the cost and size of the optical demultiplexing / transmission apparatus having the OADM function unit.

(Embodiment 3)
Next, an embodiment of the present invention will be described with reference to FIG. FIG. 5 is a diagram illustrating a state where two-way bidirectional communication is performed in the wavelength division multiplexing optical communication network system. In the following description, components having the same functions as the components described in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The wavelength division multiplexing optical communication network system includes a WDM terminal apparatus 0311A, a first optical demultiplexing transmission apparatus 0312A, a second optical demultiplexing transmission apparatus 0312B, a WDM terminal apparatus 0311B, and a network control apparatus 0114. Prepare. The second optical demultiplexing / transmitting device 0312B is provided on the east side of the first optical demultiplexing / transmitting device 0312A. The WDM terminal equipment 0311A is provided on the west side of the first optical demultiplexing / transmission apparatus 0312A. The WDM terminal device 0311B is provided on the east side of the second optical demultiplexing / transmitting device 0312B. The WDM terminal station devices 0311A and 0311B and the optical multiplexing / demultiplexing transmission devices 0312A and 0312B are connected to the network control device 0114, and receive setting information regarding wavelength path setting from the network control device 0114.

  The WDM terminal equipment 0311A and the first optical demultiplexing / transmission apparatus 0312A are connected by two transmission line optical fibers 0313A and 0313B. The first optical demultiplexing / transmitting device 0312A and the second optical demultiplexing / transmitting device 0312B are connected by two transmission line optical fibers 0313C and 0313D. The second optical demultiplexing / transmitting device 0312B and the WDM terminal device 0311B are connected by two transmission line optical fibers 0313E and 0313F.

  The WDM terminal equipment 0311A includes a transponder 0101X, a wavelength demultiplexing device 0302A, a first DCM 0103A, a second DCM 0103B, a first optical fiber amplifier 0304A, and a second optical fiber amplifier 0304B.

The wavelength demultiplexing device 0302A includes a multiplexing unit 0302B and a demultiplexing unit 0302C.
Multiplexer 0302B multiplexes the signal input from transponder 0101X and outputs the multiplexed signal to first DCM 0103A. The separation unit 0302C separates the signal input from the second DCM 0103B and outputs the separated signal to the transponder 0101X.

  The first optical fiber amplifier 0304A is a module having a function of amplifying the attenuated signal. The first optical fiber amplifier 0304A outputs the signal input from the first DCM 0103A to the first optical demultiplexing / transmitting device 0312A via the transmission line optical fiber 0313A.

  The second optical fiber amplifier 0304B is a module having a function of amplifying the attenuated signal. The second optical fiber amplifier 0304B outputs the signal input from the first optical demultiplexing transmission device 0312A via the transmission line optical fiber 0313B to the second DCM 0103B.

  The WDM terminal equipment 0311B includes a transponder 0101Z, a wavelength demultiplexing device 0302D, a first DCM 0103A, a second DCM 0103B, a third optical fiber amplifier 0304C, and a fourth optical fiber amplifier 0304D.

The wavelength demultiplexing device 0302D includes a multiplexing unit 0302E and a demultiplexing unit 0302F.
The multiplexing unit 0302E multiplexes the signal input from the transponder 0101Z and outputs the multiplexed signal to the first DCM 0103A. The separation unit 0302F separates the signal input from the second DCM 0103B and outputs the signal to the transponder 0101Z.

  The third optical fiber amplifier 0304C is a module having a function of amplifying the attenuated signal. The third optical fiber amplifier 0304C outputs the signal input from the first DCM 0103A to the second optical demultiplexing / transmitting device 0312B via the transmission line optical fiber 0313F.

  The fourth optical fiber amplifier 0304D is a module having a function of amplifying the attenuated signal. The fourth optical fiber amplifier 0304D outputs the signal input from the second optical demultiplexing transmission device 0312B through the transmission line optical fiber 0313E to the second DCM 0103B.

  The first optical demultiplexing transmission device 0312A includes a transponder 0101Y, a third DCM 0103C, a multiplexing WDM coupler 0307A, a demultiplexing WDM coupler 0307B, an optical fiber amplifier 0108A, an optical fiber amplifier 0108B, and an OADM. A function unit 0109 is provided.

  The multiplexing WDM coupler 0307A includes a signal input from the first optical fiber amplifier 0304A via the transmission line optical fiber 0313A, and a demultiplexing WDM coupler 0307D of the second optical demultiplexing transmission device 0312B described later. The signal input via the transmission line optical fiber 0313C is multiplexed. The multiplexing WDM coupler 0307A outputs the combined signal to the optical fiber amplifier 0108A.

  The demultiplexing WDM coupler 0307B demultiplexes the signal input from the optical fiber amplifier 0108B. For example, the demultiplexing WDM coupler 0307B outputs a long wavelength band signal to the multiplexing WDM coupler 0307C of the second optical demultiplexing transmission device 0312B, which will be described later, via the transmission line optical fiber 0313D. Is output to the second optical fiber amplifier 0304B via the transmission line optical fiber 0313B.

  The second optical demultiplexing transmission device 0312B includes a transponder 0101Y, a third DCM 0103C, a multiplexing WDM coupler 0307C, a demultiplexing WDM coupler 0307D, an optical fiber amplifier 0108A, an optical fiber amplifier 0108B, and an OADM. A function unit 0109 is provided.

  The multiplexing WDM coupler 0307C transmits the signal input from the third optical fiber amplifier 0304C via the transmission path optical fiber 0313F and the demultiplexing WDM coupler 0307B of the first optical demultiplexing transmission apparatus 0312A to the transmission path. The signal input through the optical fiber 0313D is multiplexed. The multiplexing WDM coupler 0307C outputs the combined signal to the optical fiber amplifier 0108A.

  The demultiplexing WDM coupler 0307D demultiplexes the signal input from the optical fiber amplifier 0108B. For example, the demultiplexing WDM coupler 0307D outputs a long wavelength band signal to the fourth optical fiber amplifier 0304D via the transmission line optical fiber 0313E, and sends a short wavelength band signal to the fourth optical fiber amplifier 0313C. Then, the signal is output to the multiplexing WDM coupler 0307A of the first optical demultiplexing / transmission apparatus 0312A.

  As a result, in the case where single-fiber bidirectional transmission is impossible because a directional device such as an optical fiber amplifier is installed in the transmission path in advance, it is possible to handle two-fiber bidirectional transmission. The size and cost of the device can be reduced.

(Embodiment 4)
FIG. 6 is an example of a wavelength division multiplexing optical communication network system for one-core bidirectional transmission in which a plurality of optical multiplexing / demultiplexing apparatuses are connected in a ring topology. A description will be given assuming that a wavelength division multiplexing optical communication network system for one-core bidirectional transmission connected in a ring topology includes first to fourth optical demultiplexing transmission apparatuses 0112A to 0112D.

The first optical demultiplexing / transmitting device 0112A is connected to the second optical demultiplexing / transmitting device 0112B and the fourth optical demultiplexing / transmitting device 0112D.
The second optical demultiplexing / transmitting device 0112B is connected to the first optical demultiplexing / transmitting device 0112A and the third optical demultiplexing / transmitting device 0112C.
The third optical demultiplexing / transmitting device 0112C is connected to the second optical demultiplexing / transmitting device 0112B and the fourth optical demultiplexing / transmitting device 0112D.
The fourth optical demultiplexing / transmitting device 0112D is connected to the first optical demultiplexing / transmitting device 0112A and the third optical demultiplexing / transmitting device 0112C.
Here, each of the first to fourth optical demultiplexing / transmission apparatuses 0112A to 0112D has the same configuration as the optical demultiplexing / transmission apparatus 0112 shown in the second embodiment.

Even in the case of such a ring topology, the optical fiber amplifier, the OADM function unit, and the DCM function unit in the optical demultiplexing transmission apparatus are connected to the short wavelength band (with the same method as that shown in the third embodiment. Since it is possible to make common with respect to the upstream and long wavelength bands (downstream), it is possible to reduce the size and cost of the apparatus.
Also, with this configuration, for example, when a signal is transmitted from the first optical demultiplexing / transmitting device 0112A to the third optical demultiplexing / transmitting device 0112C, there is a failure in the second optical demultiplexing / transmitting device 0112B. Even if it occurs, the signal can be transmitted via the fourth optical demultiplexing / transmitting device 0112D, so that the tolerance to the failure is increased.

(Embodiment 5)
FIG. 7 is an example of a wavelength division multiplexing optical communication network system for two-core bidirectional transmission in which a plurality of optical multiplexing / demultiplexing apparatuses are connected in a ring topology. A description will be given assuming that a wavelength division multiplexing optical communication network system for one-core bidirectional transmission connected in a ring topology includes first to fourth optical demultiplexing transmission apparatuses 0312A to 0312D.

The first optical demultiplexing / transmitting device 0312A is connected to the second optical demultiplexing / transmitting device 0312B and the fourth optical demultiplexing / transmitting device 0312D.
The second optical demultiplexing / transmitting device 0312B is connected to the first optical demultiplexing / transmitting device 0312A and the third optical demultiplexing / transmitting device 0312C.
The third optical demultiplexing / transmitting device 0312C is connected to the second optical demultiplexing / transmitting device 0312B and the fourth optical demultiplexing / transmitting device 0312D.
The fourth optical demultiplexing / transmitting device 0312D is connected to the first optical demultiplexing / transmitting device 0312A and the third optical demultiplexing / transmitting device 0312C.
Here, the first to fourth optical demultiplexing / transmitting devices 0312A to 0312D each have the same configuration as the optical demultiplexing / transmitting device 0312 shown in the third embodiment.

Even in the case of the ring topology as described above, the optical fiber amplifier, the OADM function unit, and the DCM function unit in the optical demultiplexing transmission apparatus are connected to the short wavelength band (in the same way as the method described in the fourth embodiment). Since it is possible to make common with respect to the upstream and long wavelength bands (downstream), it is possible to reduce the size and cost of the apparatus.
Also, with this configuration, for example, when a signal is transmitted from the first optical demultiplexing / transmitting device 0312A to the third optical demultiplexing / transmitting device 0312C, the second optical demultiplexing / transmitting device 0312B has a failure. Even if it occurs, the signal can be transmitted via the fourth optical demultiplexing / transmitting device 0312D, so that the tolerance to the failure is increased.

(Embodiment 6)
Another embodiment related to the OADM function unit will be described using differences from the OADM function unit 0109 shown in the first embodiment.

  9 includes a wavelength blocker 0801, an input-side optical coupler 1301A (optical power demultiplexing unit), an output-side optical coupler 1301B (optical power multiplexing unit), a DCM 0603, an optical fiber amplifier 0604, and wavelength division multiplexing. A device 1302A (wavelength path demultiplexing means), a wavelength demultiplexing device 1302B (wavelength path demultiplexing means), and a node control circuit 0911 are included. The interconnections between the components are as shown in the figure. The wavelength blocker 0801 has one input port and one output port, blocks the passage of channels of any wavelength with respect to individual input wavelength channels, and transmits and outputs other wavelength channels. It has the function to output to. The wavelength blocker 0801 is wavelength path transmission blocking means. Hereinafter, the wavelength demultiplexing device 1302A that outputs an optical signal to the transponder is referred to as a first wavelength demultiplexing device, and the wavelength demultiplexing device 1302B that inputs the optical signal from the transponder is referred to as a first wavelength demultiplexing device.

  The operation of the wavelength path setting related to the OADM function unit shown in FIG. 9 will be described. The drop optical signal from the WDM line to the transponder 0601 is optically branched from the WDM line by the input side optical coupler 1301A and then received by the transponder via the wavelength demultiplexing device 1302. At the same time, the wavelength blocker 0801 controlled by the node control circuit 1011 performs blocking setting so that the optical signal does not transmit the same wavelength as the Drop optical signal. The wavelength path transmission setting in the optical demultiplexing / transmission apparatus 0112 is set by the wavelength blocker 0801 controlled by the node control circuit 1011 so that the optical signal transmits at the same wavelength as the transmission optical signal. An Add optical signal from the transponder 0601 to the WDM line is multiplexed on the WDM line by the output side optical coupler 1301B via the wavelength demultiplexing device 1302.

  The OADM function unit 1009 shown in FIG. 10 includes optical components similar to those in the configuration example shown in FIG. 8 except for the node control circuit 0811. However, the 1 × 2 wavelength selective switch 0901A is used as the wavelength selective switch, and Is different. The interconnections between the components are as shown in the figure.

  The operation of the wavelength path setting related to the OADM function unit shown in FIG. 10 will be described. For drop setting from the WDM line to the transponder 0601, in the 1 × 2 wavelength selective switch 0901A controlled by the node control circuit 1011, the drop signal input from the input port is connected to the wavelength demultiplexing device 1302 Is output by the node control circuit 1011 and is received by the transponder 0601 via the wavelength demultiplexing device 1302. The wavelength path transmission setting in the optical demultiplexing / transmission apparatus 0112 is 1 by the node control circuit 1011 so that the transmitted optical signal input from the input port is output to the optical coupler 1301 in the 1 × 2 wavelength selective switch 0901A. The × 2 wavelength selective switch 0901A is controlled. An Add optical signal from the transponder 0601 to the WDM line is multiplexed on the WDM line by the optical coupler 1301 via the wavelength demultiplexing device 1302.

  The OADM function unit 1109 shown in FIG. 11 includes a 1 × N (N is a natural number of 2 or more) wavelength selective switch 1101, an optical coupler 1301, an optical fiber amplifier 0604, a DCM 0603, a wavelength demultiplexing device 1302, and a node control circuit 1111. The The interconnections between the components are as shown in the figure. The 1 × N wavelength selective switch 1101 has one input port and N output ports, and has a function of outputting any wavelength and the number of channels input from the input port to any output port.

  The operation of the wavelength path setting related to the OADM function unit shown in FIG. 11 will be described. For drop setting from the WDM line to the transponder 0601, in the 1 × N wavelength selective switch 1101 controlled by the node control circuit 1111, the Drop signal input from the input port is output from the output port connected to the designated transponder 0601. It is set by the node control circuit 1111 to output and received by the transponder 0601. The wavelength path transmission setting in the optical demultiplexing transmission device 0112 is performed by the node control circuit 1011 so that the 1 × N wavelength selective switch 1101 outputs the transmitted optical signal input from the input port to the optical coupler 1301. The × N wavelength selective switch 1101 is controlled. An Add optical signal from the transponder 0601 to the WDM line is multiplexed on the WDM line by the optical coupler 1301 via the wavelength demultiplexing device 1302.

  The OADM function unit 1209 illustrated in FIG. 12 includes a 1 × N wavelength selective switch 1201A, an N × 1 wavelength selective switch 1201B, an optical fiber amplifier 0604, and a DCM 0603. The interconnections between the components are as shown in the figure. The OADM function unit 109B is provided with a node control circuit 1211 outside. The node control circuit 1211 is connected to the 1 × N wavelength selective switch 1201A, the N × 1 wavelength selective switch 1201B, and the transponder 0601, respectively.

  Thereby, since the WDM signal of the transponder is directly accommodated in the input / output port of the 1 × N wavelength selective switch 1201A, the setting of the WDM transmission signal wavelength and the reception signal wavelength of the transponder is not limited, and the operation band (for example, C− Band) all wavelength channels can be set. On the other hand, the wavelength demultiplexing device 1302 in the configuration examples shown in FIGS. 8 to 11 has a fixed connection between the wavelength demultiplexing port for inputting / outputting the fixed wavelength and the input / output port for the WDM transmission signal and the WDM reception signal of the transponder. The WDM transmission / reception wavelength setting of the transponder is fixed to the wavelength of the wavelength separation port of the connected wavelength demultiplexing device. Since this restriction is eliminated, the embodiment of the present invention has an effect that the WDM transmission signal wavelength and the WDM reception signal wavelength of the transponder can be arbitrarily set.

  Note that the node control circuits 0911, 1011, 1111, and 1211 control the optical components necessary for the wavelength path setting of the OADM function unit based on the wavelength path setting request received from the network control device 0114, similarly to the node control circuit 0811. And is connected to each optical component by a control line in the optical demultiplexing transmission apparatus. For example, the node control circuit 1211 is connected to the 1 × N wavelength selective switch 1201A and the N × 1 wavelength selective switch 1201B and the transponder 0601, respectively, and sets the wavelength path based on the wavelength path setting request received from the network control device 0114. Take control.

  Thus, the OADM function unit can change the configuration in accordance with the required conditions. Therefore, since the size and cost of the OADM function unit can be optimized according to the scene used, the size and cost of the optical demultiplexing transmission apparatus having the OADM function unit can be optimized.

(Embodiment 6)
With the optical power / loss budget design and chromatic dispersion design, the error rate at the transponder receiver is determined for the parameters that determine the transmission quality, such as the received power level, OSNR (Optical Signal to Noise Ratio), and residual dispersion value at the optical receiver of the operational transponder. Is within the required numerical range. At this time, in the WDM terminal device 0111 in FIG. 2, the functional unit constituted by the optical couplers 0105A, O105B, DCM 0103A, 0103B, and the optical fiber amplifiers 0104A, 0104B is removed from the wavelength multiplexing / demultiplexing device 0112, and the OADM functional unit 0109 is removed. A functional configuration in which the DCM 0103C and the optical fiber amplifier 0108B are connected may be replaced.

  As a result, the short wavelength band and the long wavelength band DCM and the optical fiber amplifier can be shared in the WDM terminal station apparatus 0111, and the WDM terminal station apparatus can be reduced in size and cost.

  Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention. For example, in the second embodiment, a long wavelength band optical signal is transmitted from a device provided on the west side of the optical demultiplexing transmission device 0112 to a device provided on the east side, and the device provided on the east side transmits the west signal. The apparatus provided on the side has been described as transmitting an optical signal in a short wavelength band, but is not limited thereto. In addition, as for the plurality of DCMs 0103 and the optical fiber amplifier 0104 used in the above, different performance parameters (dispersion compensation amount, gain, input / output optical power range, etc.) may be applied depending on where they are deployed. .

  A part or all of the above embodiment can be described as in the following supplementary notes, but is not limited thereto.

(Appendix 1)
In a wavelength path multiplex / demultiplex transmission apparatus configured with a wavelength path and a wavelength band multiplex / demultiplex function unit and a transponder and setting a plurality of wavelength paths for a plurality of paths
The wavelength band is divided into a plurality of sub-wavelength bands associated with a plurality of routes,
The wavelength path and wavelength band demultiplexing function unit is composed of wavelength band multiplexing means, wavelength band separation means and wavelength path selection switching means,
The wavelength band multiplexing means connects a transmission line corresponding to a plurality of paths and an input port, multiplexes wavelength signals included in a sub-wavelength band input to the input port, and outputs the multiplexed signal to an output port. The output port of the band multiplexing means is connected to the input port of the wavelength path selection switching means,
The wavelength path selection switching means is connected to the transponder via a wavelength path demultiplexing port,
The output port of the wavelength path selection switching means is connected to the input port of the wavelength band separation means,
The wavelength band separation means separates a wavelength path multiplexed signal input from an input port into a plurality of sub-wavelength bands and outputs it to an output port, and the output port of the wavelength band separation means transmits corresponding to a plurality of routes. A wavelength-path multiplexing / demultiplexing transmission device characterized by being configured to be connected to a path.
(Appendix 2)
The wavelength band multiplexing means is connected to a transmission line corresponding to a plurality of paths via a one-core bidirectional wavelength band multiplexing means,
The wavelength path demultiplexing / transmission apparatus according to appendix 1, wherein the wavelength band demultiplexing means is connected to a transmission line corresponding to a plurality of paths via a one-core bidirectional wavelength band demultiplexing means.
(Appendix 3)
The wavelength path multiplexing switching means is composed of a first wavelength path selection switching means and a second wavelength path selection switching means,
An output port of the wavelength band multiplexing means is connected to an input port of the first wavelength path selection switching means;
An output port of the first wavelength path selection switching means is connected to a reception port of the transponder;
An output port of the first wavelength path selection switching means is connected to an input port of the second wavelength path selection switching means;
A transmission port of the transponder is connected to an input port of the second wavelength path selection switching means;
The wavelength path multiplex / demultiplex transmission apparatus according to appendix 1 or appendix 2, wherein an output port of the second wavelength path selection switching means is connected to an input port of the wavelength band separation means.
(Appendix 4)
The wavelength path demultiplexing unit is composed of optical power multiplexing means, wavelength path transmission blocking means, optical power demultiplexing means, wavelength path multiplexing means, and wavelength path demultiplexing means,
An output port of the wavelength band multiplexing means is connected to an input port of the optical power demultiplexing means;
The output port of the optical power demultiplexing means is connected to the reception port of the transponder via the wavelength path separation means,
The output port of the optical power multiplexing means is connected to the input port of the previous wavelength path transmission blocking means,
An output port of the wavelength path transmission blocking means is connected to an input port of the optical power multiplexing means;
The transmission port of the transponder is connected to the input port of the optical power multiplexing means via the wavelength path multiplexing means,
The wavelength path multiplex / demultiplex transmission apparatus according to appendix 1 or appendix 2, wherein an output port of the optical power multiplexing unit is connected to an input port of the wavelength band demultiplexing unit.
(Appendix 5)
The wavelength path demultiplexing unit is composed of optical power demultiplexing means, wavelength path selection switching means, wavelength path multiplexing means, and wavelength path demultiplexing means,
An output port of the wavelength band multiplexing means is connected to an input port of the optical power demultiplexing means;
The output port of the optical power demultiplexing means is connected to the reception port of the transponder via the wavelength path separation means,
The output port of the optical power demultiplexing means is connected to the input port of the previous wavelength path selection switching means,
The transmission port of the transponder is connected to the input port of the wavelength path selection switching means via the wavelength path multiplexing means,
The wavelength path multiplex / demultiplex transmission apparatus according to claim 1 or 2, wherein an output port of the wavelength path selection switching means is connected to an input port of the wavelength band separation means.
(Appendix 6)
The wavelength path demultiplexing unit is composed of optical power multiplexing means, wavelength path selection switching means, wavelength path multiplexing means, and wavelength path separation means,
An output port of the wavelength band multiplexing means is connected to an input port of the wavelength path selection switching means;
The output port of the wavelength path selection switching means is connected to the reception port of the transponder via the wavelength path separation means,
An output port of the wavelength path selection switching means is connected to an input port of the optical power multiplexing means;
The transmission port of the transponder is connected to the input port of the optical power multiplexing means via the wavelength path multiplexing means,
The wavelength path multiplex / demultiplex transmission apparatus according to appendix 1 or appendix 2, wherein an output port of the optical power multiplexing unit is connected to an input port of the wavelength band demultiplexing unit.
(Configuration example 7)
The wavelength path demultiplexing unit is composed of optical power multiplexing means, wavelength path selection switching means, and wavelength path multiplexing means,
An output port of the wavelength band multiplexing means is connected to an input port of the wavelength path selection switching means;
The output port of the wavelength path selection switching means is connected to the reception port of the transponder;
An output port of the wavelength path selection switching means is connected to an input port of the optical power multiplexing means;
The transmission port of the transponder is connected to the input port of the optical power multiplexing means via the wavelength path multiplexing means,
The wavelength path multiplex / demultiplex transmission apparatus according to appendix 1 or appendix 2, wherein an output port of the optical power multiplexing unit is connected to an input port of the wavelength band demultiplexing unit.
(Appendix 8)
8. The wavelength path demultiplexing / transmission apparatus according to any one of appendix 1 to appendix 7, wherein an optical amplifying unit is inserted between an input port and an output port of any two functional units constituting the wavelength path demultiplexing unit .
(Appendix 9)
8. The wavelength path demultiplexing transmission according to any one of appendix 1 to appendix 7, wherein chromatic dispersion compensation means is inserted between the input port and output port of any two functional means constituting the wavelength path demultiplexing unit apparatus.
(Appendix 10)
An optical amplification means is inserted between the input port and the output port of any two functional means constituting the wavelength path demultiplexing unit,
8. The wavelength path according to claim 1, further comprising chromatic dispersion compensation means inserted between the input port and the output port of any two functional means constituting the wavelength path demultiplexing unit. Demultiplexing transmission device. (Appendix 11)
In a wavelength path demultiplexing network configured by a wavelength path demultiplexing device composed of a wavelength path and a wavelength band demultiplexing function unit and a transponder, and setting a plurality of wavelength paths for a plurality of paths,
Dividing the wavelength band into multiple sub-wavelength bands associated with multiple paths,
The wavelength path and wavelength band demultiplexing function unit are:
A wavelength band multiplexed signal is generated by wavelength band multiplexing wavelength signals included in a sub wavelength band input from a transmission path corresponding to a plurality of paths,
For any wavelength path included in the wavelength band multiplexed signal,
The wavelength path signal is separated from the wavelength band multiplexed signal and input to the transponder receiving unit, or the wavelength path signal transmitted from the transponder transmitting unit is wavelength path multiplexed to the wavelength band multiplexed signal, or the node device Wavelength path transmission output to an arbitrary path without performing the wavelength path separation and the wavelength path multiplexing operation,
Any one or any combination of actions
About the wavelength band multiplexed signal after the processing of the wavelength path separation, the wavelength path multiplexing, or the wavelength path transmission output is performed,
A wavelength path setting method characterized by separating wavelength bands into a plurality of sub-wavelength bands and outputting the sub-wavelength bands to a transmission line corresponding to the plurality of paths.
(Appendix 12)
In the wavelength path and wavelength band demultiplexing function unit,
The wavelength path signal output from the node device and input to the adjacent node device and the wavelength path signal output from the adjacent node device and input to the node device are wavelength band multiplexed and wavelength band separated to obtain a single signal. The wavelength path setting method according to appendix 1, wherein transmission is performed through a transmission path.

0101 Transponder 0102 Wavelength demultiplexing device 0104, Optical fiber amplifier 0105A-D WDM coupler 0107A, 0107B WDM coupler 0108A, 0108B Optical fiber amplifier 0109 Function unit 0111 Terminal station device 0112 Optical demultiplexing transmission device 0113 Transmission path optical fiber 0114 Network control device 0302A, 0302D Wavelength demultiplexing device 0302B, 0302E Multiplexer 0302C, 0302F Demultiplexer 0304A-D Optical fiber amplifier 0307A, 0307C Demultiplexing WDM coupler 0307B, 0307D Demultiplexing WDM coupler 0311A, 0311B End station devices 0312A, 0312B Optical demultiplexing Separation transmission device 0313A-F Transmission path optical fiber 0601 Transponder 0604 Optical fiber amplifier 0605 Coupler 606 OADM unit 0612 Optical demultiplexing transmission device 0613 Transmission line optical fiber 0801 Wavelength selection switch 0811 Node control circuit 0901 Wavelength selection switch 0909 OADM function unit 0911 Node control circuit 1009 OADM function unit 1011 Node control circuit 1101 Wavelength selection switch 1109 OADM function unit 1111 Node control circuit 1201 Wavelength selective switch 1209 OADM function part 1211 Node control circuit 1301 Optical coupler 1301A Input side optical coupler 1301B Output side optical coupler 1302 Wavelength demultiplexing device 1302A Wavelength demultiplexing device 1302B Wavelength demultiplexing device

Claims (12)

Wavelength band multiplexing means for multiplexing the optical signals of the first and second wavelength groups having different wavelengths transmitted from the first route and the second route;
The optical signal having a predetermined wavelength among the optical signals multiplexed by the wavelength band multiplexing means is optically branched / inserted, and the signal is input / output to / from an external device, and an optical signal other than the predetermined wavelength is allowed to pass. Optical add / drop means;
Wavelength separation means for wavelength-separating the optical signal output from the optical add / drop means, and transmitting the separated first and second optical signals to either the first route or the second route; With
The wavelength band multiplexing means inputs an optical signal of the first wavelength group from a first optical cable, inputs an optical signal of the second wavelength group from a second optical cable,
The wavelength band separation unit outputs one optical signal of the first or second optical signal to a third optical cable and the other of the first or second optical signal to a fourth optical cable. Output the optical signal of
Optical demultiplexing transmission device. The wavelength band demultiplexing means outputs an optical signal having a first wavelength input from the first path to the wavelength band multiplexing means to a second path, and outputs the second signal to the wavelength band multiplexing means. An optical signal of the second wavelength input from is output to the first path;
The optical demultiplexing transmission apparatus according to claim 1. The optical demultiplexing transmission device comprises:
The optical signal from the first path and the optical signal output from the wavelength band separation unit to the first path are input, and the optical signal from the first path is input to the wavelength band multiplexing unit. A first wavelength division multiplexing unit for transmission that multiplexes and multiplexes the optical signal so that the optical signal input from the wavelength band separation unit is output to the first path.
The optical demultiplexing transmission apparatus according to claim 1 or 2 . The optical add / drop means includes an optical coupler for demultiplexing the optical signal input from the wavelength band multiplexing means,
A first wavelength demultiplexing device that separates an input signal input from the first optical coupler and outputs an optical signal having a predetermined wavelength to the external device;
A second wavelength demultiplexing device that outputs an optical signal of a predetermined wavelength input from the external device;
A 2 × 1 wavelength selective switch that multiplexes the optical signal demultiplexed by the optical coupler and the optical signal input from the external device;
The optical demultiplexing transmission apparatus according to any one of claims 1 to 3 . The optical add / drop means comprises:
A 1 × 2 wavelength selective switch for separating an input optical signal;
A first wavelength demultiplexing device that separates an input signal input from the 1 × 2 wavelength selective switch and outputs an optical signal having a predetermined wavelength to the external device;
A second wavelength demultiplexing device that outputs an optical signal of a predetermined wavelength input from the external device;
An optical coupler that multiplexes the optical signal passed through the 1 × 2 wavelength selective switch and the optical signal input from the external device;
The optical demultiplexing transmission apparatus according to any one of claims 1 to 3 . The optical add / drop means comprises:
A 1 × N (N is a natural number of 2 or more) wavelength selective switch for separating an input optical signal and outputting an optical signal having a predetermined wavelength to the external device;
A second wavelength demultiplexing device that outputs an optical signal of a predetermined wavelength input from the external device;
An optical coupler that multiplexes the optical signal that has passed through the 1 × N wavelength selective switch and the optical signal input from the external device;
The optical demultiplexing transmission apparatus according to any one of claims 1 to 3 . The optical add / drop means comprises:
A 1 × N (N is a natural number of 2 or more) wavelength selective switch for separating an input optical signal and outputting an optical signal having a predetermined wavelength to the external device;
An N × 1 wavelength selective switch that multiplexes an optical signal that has passed among the optical signals separated by the 1 × N wavelength selective switch and an optical signal input from the external device;
The optical demultiplexing transmission apparatus according to any one of claims 1 to 3 . An optical demultiplexing transmission control system comprising the optical demultiplexing transmission device according to any one of claims 1 to 7 ,
The plurality of optical demultiplexing transmission devices are connected by a linear topology,
Optical demultiplexing transmission control system. An optical demultiplexing transmission control system comprising the optical demultiplexing transmission device according to any one of claims 1 to 7 ,
The plurality of optical demultiplexing transmission devices are connected by a ring topology,
Optical demultiplexing transmission control system. The optical add / drop means comprises:
An input-side optical coupler that separates an input optical signal;
A first wavelength demultiplexing device that separates an input signal input from the first optical coupler and outputs an optical signal having a predetermined wavelength to the external device;
A wavelength blocker for controlling the passage and blocking of a part of the optical signal separated by the optical coupler;
A second wavelength demultiplexing device that outputs an optical signal of a predetermined wavelength input from the external device;
An output-side optical coupler that multiplexes the optical signal that has passed through the wavelength blocker and the optical signal that has been input from the second wavelength demultiplexing device;
The optical demultiplexing transmission apparatus according to any one of claims 1 to 4 . Multiplexing the optical signals of the first and second wavelength groups having different wavelengths transmitted from the first route and the second route,
Optically splitting / inserting an optical signal having a predetermined wavelength among the optical signals multiplexed by the wavelength band multiplexing means, inputting / outputting the signal to / from an external device, and passing an optical signal other than the predetermined wavelength ,
Wavelength-separating the optical signal output from the optical add / drop means, and transmitting the separated first and second optical signals to either the first route or the second route ;
The wavelength band multiplexing means inputs an optical signal of the first wavelength group from a first optical cable, inputs an optical signal of the second wavelength group from a second optical cable,
The wavelength band separation unit outputs one optical signal of the first or second optical signal to a third optical cable and the other of the first or second optical signal to a fourth optical cable. Output the optical signal of
Optical demultiplexing transmission method. An optical demultiplexing transmission control system comprising at least one optical demultiplexing transmission apparatus and a network control apparatus,
The optical demultiplexing transmission device
Wavelength band multiplexing means for multiplexing the optical signals of the first and second wavelength groups having different wavelengths transmitted from the first route and the second route;
The optical signal having a predetermined wavelength among the optical signals multiplexed by the wavelength band multiplexing means is optically branched / inserted, and the signal is input / output to / from an external device via a transponder. An optical add / drop means for passing an optical signal;
Wavelength separation means for wavelength-separating the optical signal output from the optical add / drop means, and transmitting the separated first and second optical signals to either the first route or the second route; With
The network control device includes:
The network control device controls the operation so that the optical add / drop unit of the optical demultiplexing / transmitting device performs optical add / drop of an optical signal having a predetermined wavelength, and the transponder inputs / outputs an optical signal having a predetermined wavelength. ,
The wavelength band multiplexing means inputs an optical signal of the first wavelength group from a first optical cable, inputs an optical signal of the second wavelength group from a second optical cable,
The wavelength band separation unit outputs one optical signal of the first or second optical signal to a third optical cable and the other of the first or second optical signal to a fourth optical cable. Output the optical signal of
Network control system.

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