Integrated optical wavelength demultiplexer (iowd)

Details Integrated optical wavelength demultiplexer (iowd) Integrated optical wavelength demultiplexer (iowd)

G - Physics

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G02B 5/00 (2006.01) G02B 6/12 (2006.01) G02B 6/124 (2006.01) G02B 6/30 (2006.01) G02B 6/34 (2006.01)

Patent

CA 1108903

INTEGRATED OPTICAL WAVELENGTH DEMULTIPLEXER (IOWD) Abstract of the Disclosure An integrated optical wavelength demulti- plexer has deposited on a waveguide layer a pair of Luneburg lenses, the first for collimating light from an optical fiber, the second for focussing light at an array of photo- detectors formed under the waveguide layer. Between the lenses is the dispersive element, a thin-film prism of a highly dispersive low-loss material such as arsenic trisulfide. A known integrated optical demultiplexer, which uses a chirped diffraction grating to spatially disperse (rather than angularly disperse) the optical wavelengths, would suffer a greater insertion loss particularly for wavelengths coupled out at a later point in the grating. Demultiplexing with a thin-film prism should also result in the capability to handle a larger number of channels, for a given channel isolation and substrate area. - i -

342055

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