Patent ID: 7133614
Filing Date: 2006-11-07
Classification: H04J,H04Q

Abstract:
1. An optical multiplex transmission method for transmitting optical signals from a first optical transmission line to a second transmission line, comprising: transmitting an optical signal group across a plurality of nodes in network wherein said second transmission line connects a first node to a next second node; for each of said nodes in said network, accepting from a first optical transmission line a multiplexed optical signal group, said optical sign group having a plurality of optical wavelength signals and outputting the resulting multiplexed optical wavelength signals to a second transmission line; wherein in the processing of outputting the multiplexed optical wavelength signal to said second transmission line, specifying wavelengths which are not used only in the second optical line by checking state of usage of wavelengths in said next second node; converting at least one of the optical wavelength signals included in the optical signal group, into a wavelength-converted optical wavelength signal whose wavelength is one among the wavelengths not used only in the second optical transmission line; and multiplexing said at least one said wavelength-converted optical wavelength signal with at least one other of the optical wavelength signals included in said optical signal group wherein said wavelength-converted optical wavelength signal is not multiplexed with the optical wavelength signal from which said wavelength-converted optical wavelength signal was originally converted.