Patent ID: 8693880
Filing Date: 2014-04-08
Classification: H04J,H04Q

Abstract:
1. A wavelength path communication node apparatus that is used in an optical communication network in which respective traffics are assigned by a wavelength division multiplexing transmission method to a plurality of wavelength paths for performing data communication using optical signals having unique wavelengths, wavelength path signals of the wavelength paths are multiplexed into one optical signal, and the optical signal is transmitted via wavelength multiplexing transmission lines, and that switches and connects the wavelength path between the wavelength multiplexing transmission lines, the apparatus comprising: a plurality of optical branching couplers which are arranged for the respective wavelength multiplexing transmission lines, and each of which branches power of an optical signal received from the wavelength multiplexing transmission line into a plurality of branched optical signals; a plurality of multiplexing system wavelength selection switches which are arranged for the respective wavelength multiplexing transmission lines, and each of which selects wavelength path signals of arbitrary wavelengths from the plurality of branched optical signals branched by said optical branching couplers, multiplexes the wavelength path signals into one optical signal, and transmits the optical signal to the wavelength multiplexing transmission line; a wavelength path demultiplexer which includes a plurality of wavelength multiplexing ports that are arranged for said respective optical branching couplers and receive the branched optical signals from said optical branching couplers, and a plurality of wavelength demultiplexing ports whose connection correspondence with the wavelength multiplexing ports is uniquely determined by a wavelength, and which demultiplexes the branched optical signals input to the wavelength multiplexing ports into wavelength path signals of respective wavelengths, and outputs the wavelength path signals from the wavelength demultiplexing ports corresponding to the respective wavelengths; a wavelength path multiplexer which includes a plurality of wavelength multiplexing ports that are arranged for said respective multiplexing system wavelength selection switches and output wavelength path signals of at least one wavelength to said multiplexing system wavelength selection switches, and a plurality of wavelength demultiplexing ports whose connection correspondence with the wavelength multiplexing ports is uniquely determined by a wavelength, and which outputs wavelength path signals input to the wavelength demultiplexing ports from the wavelength multiplexing ports corresponding to wavelengths of the wavelength path signals; a plurality of transponders each of which includes a wavelength path transmission port and a wavelength path reception port, is connected to a client apparatus that performs data communication using a wavelength path of one wavelength, converts a wavelength path signal input to the wavelength path transmission port into a client transmission signal to transmit the client transmission signal to the client apparatus, and converts a client reception signal received from the client apparatus into a wavelength path signal of the wavelength to output the wavelength path signal from the wavelength path reception port; a demultiplexing system optical matrix switch which switches and connects the wavelength demultiplexing ports of said wavelength path demultiplexer and the wavelength path transmission ports of said transponders; a multiplexing system optical matrix switch which switches and connects the wavelength demultiplexing ports of said wavelength path multiplexer and the wavelength path reception ports of said transponders; a node controller which controls switching of said multiplexing system wavelength selection switches, said demultiplexing system optical matrix switch, and said multiplexing system optical matrix switch, assigns a wavelength path of one wavelength to said transponder, and acquires a fault generation notification from a counter transponder detected by said transponder; a transponder information table which stores, for an identification number of each transponder, connection port numbers of said demultiplexing system optical matrix switch and said multiplexing system optical matrix switch to which said transponder is connected, a transmission line number of the wavelength multiplexing transmission line on which an operating system wavelength path of said transponder is multiplexed, and a wavelength number indicating a wavelength of the operating system wavelength path; and a port correspondence table which stores, for a wavelength number indicating a wavelength of each wavelength path, a correspondence between a transmission line number of the wavelength multiplexing transmission line connected to each wavelength multiplexing port and a port number of the wavelength demultiplexing port as the connection correspondences in said wavelength path demultiplexer and said wavelength path multiplexer, wherein when setting the operating system wavelength path of said transponder, said node controller looks up said transponder information table to acquire the transmission line number, the wavelength number, and the connection port number regarding the operating system wavelength path of said transponder, looks up said port correspondence table to specify port numbers indicating the wavelength demultiplexing ports of said wavelength path multiplexer and said wavelength path demultiplexer corresponding to the transmission line number and the wavelength number, and controls switching of said demultiplexing system optical matrix switch and said multiplexing system optical matrix switch to connect the wavelength demultiplexing port of the port number specified from said port correspondence table and a connection port of the connection port number acquired from said transponder information table.