Patent ID: 7623791

Claim:
An optical signal multiplexing device for multiplexing optical signals by an optical time-division multiplexing system, the optical signal multiplexing device comprising: a plurality of delay-amount adjusting units that convert wavelengths of a plurality of obtained optical signals to be multiplexed and adjust delay amounts of the optical signals by passing the wavelength-converted optical signals through waveguides that generate propagation delays corresponding to the wavelengths in the optical signals; a plurality of waveform-degradation compensation units that compensate for degradation of a waveform of the optical signals while keeping a difference of propagation delay times between the optical signals delay amounts of which are adjusted by the delay-amount adjusting units; a plurality of optical gates that extract the optical signals compensated by the waveform-degradation compensation units at respective timings different from each other; and a multiplexing unit that multiplexes the optical signals extracted by the optical gates and a control signal including control data corresponding to the respective timings.