SUBSTRATE WAVELENGTH-DEMULTIPLEXING OPTICAL INTERCONNECTS BASED ON SUPERIMPOSED HOLOGRAPHIC GRATINGS AND 3-DIMENSIONAL BRAGG-DIFFRACTION

A four-channel substrate wavelength-division (de)multiplexer based on superimposed holographic gratings, three-dimensional Bragg diffraction , and substrate wave propagation is demonstrated. The device operates at the He-Ne laser wavelengths of 543.0,594.1,611.9, and 632.8 nm and has a measured maximum diffraction efficiency of 72% with less than -3 0 dB of channel cross talk. It is shown that the polarizations of the demultiplexed beams can be controlled by the grating index modulation, as predicted by holographic diffraction theory. The substrate wavelen gth-division (de)multiplexer device, whose demultiplexed signal propag ation directions can be defined during fabrication, should find widesp read use in integrated fiber-optic communication networks and systems.