PERFORMANCE OF MULTIWAVELENGTH SIMULTANEOUS MONITORING CIRCUIT EMPLOYING ARRAYED-WAVE-GUIDE GRATING

This paper proposes a novel multiwavelength simultaneous monitoring (M SM) circuit that uses the wavelength crossover properties of an arraye d-waveguide grating (AWG), The MSM circuit consists of an AWG, a stabi lized semiconductor laser as a reference light, and logarithmic amplif iers, The AWG chip is a simple planar-lightwave-circuit chip. It funct ions as multiple optical filters, and make it possible to monitor mult iple wavelengths simultaneously, The MSM circuit, locked to the refere nce wavelength produced by a semiconductor laser stabilized to the 154 7.49 nm (C2H2)-C-13 absorption line, achieved 10 MHz resolution and 30 MHz stability for 24 h in the stable polarization state, Measurement accuracy of better than 1.1 GHz can be realized even if the state of p olarization of the input light fluctuates at random, Multiwavelength s imultaneous monitoring is successfully demonstrated using tunable lase rs.