Optical waveguides – Planar optical waveguide
Patent
1993-11-03
1995-07-18
Ullah, Akm E.
Optical waveguides
Planar optical waveguide
257 80, G02B 644
Patent
active
054349435
ABSTRACT:
The present invention is directed at an electrically tunable filter for wavelength filtering of light. The filter comprises a substrate region, a waveguide region over the substrate, an upper region over the waveguide region, and current blocking regions adjacent to the waveguide region. The waveguide region comprises a semiconductor having a bandgap wavelength sufficiently different from the light for high peak transmission of the light. A waveguide rib layer may also be included in the waveguide region to channel the light through the filter. The current blocking regions narrow the waveguide region to increase the current density. The present invention is also directed at a method of manufacturing the filter described above.
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Katsuaki Margari, "Optical Signal Selection with a Constant Gain and a Gain Bandwidth by a Multielectrode Distributed Feedback Laser Amplifier" Appl. Phys. Lett., vol. 51, No. 24 (Dec. 14, 1987).
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Journal of Lightwave Technology, vol. 6, No. 5, May 1994, New York US, pp. 629-631, A. Dentai et al. "Electrically Tunable Semiconductor Fabry-Perot Filter".
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Dentai Andrew G.
Stone Julian
AT&T Corp.
Ullah Akm E.
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