Patent ID: 8886032
Filing Date: 2014-11-11
Classification: H04B,H04J

Abstract:
1. A wavelength multiplexing optical transmission system including a transmitter for multiplexing a predetermined number of light signals into wavelength-multiplexed light and carrying out wavelength conversion on said wavelength-multiplexed light, and a receiver for demultiplexing the wavelength-multiplexed light from said transmitter into the predetermined number of light signals, wherein said transmitter includes: a plurality of operational transmission multiplexing transponders each for multiplexing a predetermined number of light signals inputted thereto into a light signal and converting this light signal into a light signal having a specific wavelength; an input selecting unit for selecting one light signal from light signals respectively inputted to each group of corresponding input ports of said plurality of operational transmission multiplexing transponders as output light thereof; a reserve transmission multiplexing transponder for multiplexing light signals selected by said input selecting unit into a light signal and converting this light signal into a light signal having a wavelength different from those of light signals from said plurality of operational transmission multiplexing transponders; a wavelength multiplexing unit for wavelength-multiplexing the multiplexed light signals having different wavelengths which are generated by said plurality of operational transmission multiplexing transponders and said reserve transmission multiplexing transponder into a wavelength multiplexed light signal, and outputting this wavelength multiplexed light signal to said receiver; a transmit side supervisory control unit having a failure detecting unit for detecting a failure occurring in said plurality of operational transmission multiplexing transponders, and a switching control unit for carrying out selection switching control on said input selecting unit according to a result of the failure detection by said failure detecting unit; and a supervisory control signal output unit for outputting a signal showing a supervisory control state of said transmit side supervisory control unit to said receiver, and said receiver includes: a wavelength demultiplexing unit for demultiplexing the wavelength multiplexed light from said wavelength multiplexing unit into light signals having different wavelengths; a plurality of operational reception multiplexing transponders each for demultiplexing a corresponding one of said light signals into which the wavelength multiplexed light is demultiplexed by said wavelength demultiplexing unit into a predetermined number of light signals; a reserve reception multiplexing transponder for demultiplexing a corresponding one of said light signals into which the wavelength multiplexed light is demultiplexed by said wavelength demultiplexing unit into a predetermined number of light signals; an output selecting unit for selecting a light signal from each group of light signals which are respectively demultiplexed by each of said plurality of operational reception multiplexing transponders and said reserve reception multiplexing transponder as output light thereof; a supervisory control signal detecting unit for detecting the supervisory control signal from said supervisory control signal output unit; and a receive side supervisory control unit for carrying out selection switching control on said output selecting unit according to the supervisory control signal detected by said supervisory control signal detection unit.