Integrated optical wavelength demultiplexer (iowd)

Abstract

Abstract 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 -

Inventors

• 👤 Ettore Colombini

Bibliographic Details