Path-reversed substrate-guided-wave optical interconnects for wavelength-division demultiplexing

A path-reversed substrate-guided-wave holographic interconnection scheme is investigated for a wavelength-division demultiplexing application. Using a beveled edge of a waveguiding plate allows optical signals to be coupled i nto the waveguiding plate and then to be coupled out of the plate by a wave guide hologram. Theoretical analyses are given for dispersion, bandwidth, a nd recording parameters of various guided-wave holographic gratings. A devi ce is fabricated with a 45 degrees incident angle and a 45 degrees diffract ion angle by use of a 20-mu m photopolymer film. The 3-dB bandwidth of the device is measured to be 20 nm. Four-channel wavelength demultiplexing is d emonstrated at 796, 798, 800, and 802 nm with no cross talk observed. A one -to-five cascaded four-channel wavelength-division demultiplexer with +/-5% energy uniformity under s polarization is also demonstrated to increase th e user-sharing capacity. Twenty fan-out channels (5 x 4) are achieved exper imentally. (C) 1999 Optical Society of America.