Patent ID: 8195052
Filing Date: 2012-06-05
Classification: H04J

Abstract:
1. An optical wavelength multiplexing system comprising: a plurality of optical wavelength converters that convert input optical signals into arbitrary preset wavelengths and generate converted optical signals respectively; a plurality of ports in which predetermined wavelengths are preset and to which the optical wavelength converters are connected respectively; a plurality of first optical-power-level detectors that are connected to the ports respectively, and detect optical power levels of the converted optical signals input into the ports respectively; an optical coupler that multiplexes all the converted optical signals input from the ports to generate a multiplexed optical signal, the generated multiplexed optical signal being transmitted to a receiving device in the optical wavelength multiplexing system and dennultiplexed into optical signals of predetermined wavelengths; a plurality of input units that are provided in the ports respectively and input the converted optical signals input into the ports, into the optical coupler; an input controller that controls each of the input units so as not to input the converted optical signal into the optical coupler until an optical power level of the converted optical signal is detected by the first optical-power-level detector, and also controls each of the input units so as to input the converted optical signal into the optical coupler when the optical power level of the converted optical signal is detected; a second optical-power-level detector that detects, from the multiplexed optical signal, each optical power level of the predetermined wavelengths set in the ports after the converted optical signals are multiplexed; an incorrect connection detector that compares each optical power level of the converted optical signals detected by the first optical-power-level detector with each optical power level of the predetermined wavelengths detected by the second optical-power-level detector, and detects that an optical wavelength converter that converts the optical signal into a wavelength different from the predetermined wavelength set in a connected port is incorrectly connected to the port when there is a difference therebetween in the comparison result; an optical branching unit that branches the multiplexed optical signal multiplexed by the optical coupler; and a multiplexed-optical-signal demultiplexer that demultiplexes the branched multiplexed optical signal into optical signals of the respective predetermined wavelengths set in the ports, wherein the second optical-power-level detector detects, from the demultiplexed optical signals, each optical power level of the predetermined wavelengths set in the ports after the branched multiplexed optical signal is demultiplexed, and the incorrect connection detector compares each optical power level of the converted optical signals detected by the first optical-power-level detector with each optical power level of demultiplexed optical signals detected by the second optical-power-level detector, and detects that an optical wavelength converter that converts the optical signal into a wavelength different from the predetermined wavelength set in a connected port is incorrectly connected to the port when there is a difference therebetween in the comparison result.