Integrated optical wavelength demultiplexer

Details Integrated optical wavelength demultiplexer Integrated optical wavelength demultiplexer

1979-12-18

1981-07-21

Corbin, John K.

Multiplex communications

Wide area network

Packet switching

350 9611, 350 9612, 350 9618, 370 1, G02B 514

Patent

active

042794641

ABSTRACT:
An integrated optical wavelength demultiplexer 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 photodetectors 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.

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Ulrich et al., "Geometrical Optics In Thin Film Light Guides", Applied Optics, vol. 10, No. 9, Sep. 1971, pp. 2077-2085.
Tseng et al., "A Thin-Film Prism As a Beam Separator . . . ", Optics Commun., vol. 13, No. 3, Mar. 1975, pp. 342-346.
Boyd et al., "An Integrated Optical Waveguide And Charge-Coupled Device Image Array", IEEE J.Q.E., vol. QE-13, No. 4, Apr. 1977, pp. 282-287.
Yao et al., "Shadow Sputtered Diffraction-Limited Waveguide Luneberg Lenses", A.P.L., vol. 33, No. 4, Aug. 1978, pp. 307-309.
Anderson, "Integrated Optical Spectrum Analyzer: An Imminent `Chip`", IEEE Spectrum, Dec. 1978, pp. 22-29.

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