Patent ID: 7764881
Filing Date: 2010-07-27
Classification: H04J,H04Q

Abstract:
1. An optical apparatus, comprising: a plurality of input ports; a plurality of output ports; a plurality of upstream side optical devices provided corresponding to said input ports; a plurality of downstream side optical devices provided corresponding to said output ports; each of said plural upstream side optical devices having an input connected to a corresponding one of said input ports and a plurality of outputs individually connected to said plural downstream side optical devices; each of said downstream side optical devices having a plurality of inputs individually connected to the outputs of said upstream side optical devices and an output connected to a corresponding one of said output ports; said upstream side optical devices and said down-stream side optical devices being configured so as to be capable of changing over said output ports which are to be determined as output destinations of lights from said input ports for each of wavelengths; an upstream side standby switch having a plurality of inputs individually connected to said input ports and capable of changing over an output of the lights from said inputs for each of the wavelengths; a downstream side standby switch having an input connected to the output of said upstream side standby switch and a plurality of outputs individually connected to said output ports and capable of outputting the light from the input to said outputs for each of the wavelengths; and a controller to perform changeover control between a path between said input ports and said output ports for each of the optical wavelengths set by said upstream side optical devices and said downstream optical devices and another path set by said upstream side standby switch and said downstream side standby switch; wherein each of said upstream side optical devices is formed as an upstream side optical switch capable of selectively outputting the light from the input to said outputs for each of the wavelengths; said optical apparatus further comprises: a plurality of input port side optical couplers individually corresponding to said input ports each for branching a wavelength division multiplexed signal inputted from the corresponding input port into two signals and for outputting one of the branched signals to the upstream side optical device corresponding to the input port and outputting the other one of the branched signals to the upstream side standby switch; and a plurality of output port side optical couplers individually corresponding to said output ports each for multiplexing an output wavelength multiplexing optical signal outputted from the corresponding downstream side optical device and an optical signal from said downstream side standby switch; and said controller includes: a wavelength path table to store, for each of wavelengths used to form the wavelength multiplexing optical signals, a relationship between said input ports and said output ports between which a wavelength path is to be set; and a setting changing section to change a changeover setting between said upstream side optical devices and downstream side optical devices and between said upstream side standby switch and said downstream side standby switch based on contents of said wavelength path table.