4-CHANNEL INTEGRATED-OPTIC WAVELENGTH DEMULTIPLEXER WITH WEAK POLARIZATION DEPENDENCE

A new planar four-channel wavelength demultiplexer with weak polarization dependence based on an optical-phased array, is proposed and demonstrated. An experimental device with dimensions 4.5 x 3.2 mm2 is designed and fabricated, using conventional (high quality) optical lithography. The demultiplexer operates in the wavelength range 776.5-781.2 nm, with a channel spacing of 1.55 nm. Insertion loss was 0.6 dB for the central channels and 1.2 dB for the outer channels for TE polarization, excluding 1.3-dB waveguide propagation loss. Crosstalk values measured 15.4-29.7 dB for the TE and 13.4-22.2 dB for the TM polarization.