A cost-effective yet robust and versatile dual-channel spectral comparator is presented. The silica-on-silicon planar-waveguide integrated device includes two holographic Bragg-grating reflectors (HBRs) with complementary spectral transfer functions. Output comprises projections of input signal spectra onto the complementary spectral channels. Spectral comparators may be useful in optical code-division multiplexing, optical packet decoding, spectral target recognition, and the identification of molecular spectra. HBRs may be considered to be mode-specific photonic crystals.
© 2004 Optical Society of America
(050.7330) Diffraction and gratings : Volume gratings
(130.3120) Integrated optics : Integrated optics devices
(230.7390) Optical devices : Waveguides, planar
(230.7400) Optical devices : Waveguides, slab
T. W. Mossberg, D. Iazikov, and C. Greiner, "Planar-waveguide integrated spectral comparator," J. Opt. Soc. Am. A 21, 1088-1092 (2004)