Optical waveguides – Having nonlinear property
Patent
1996-07-05
1998-08-18
Ullah, Akm E.
Optical waveguides
Having nonlinear property
359326, 372 22, G02B 600
Patent
active
057969027
ABSTRACT:
A waveguide having alternating regions of different crystallographic orientations, thereby providing quasi-phase-matching for a non-linear frequency conversion, in which two wafers with or without epitaxial layers thereon are bonded together having different, preferably opposed, crystallographic orientations. One wafer is etched away, and a grating is etched such that one part of the grating has the orientation of one wafer and the other part has the orientation of the other wafer. Thereafter, a waveguide structure is epitaxially deposited upon the differentially oriented template so that the waveguide is differentially oriented in its axial direction. Thereby, quasi-phase-matching non-linear effects can be achieved. Several important devices can thereby be achieved, including a coherent optical source using frequency doubling and a frequency converter useful in wavelength division multiplexed communication, as well as others.
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Bhat Rajaram
Caneau Catherine
Koza Mark A.
Yoo Sung Joo
Bell Communications Research Inc.
Giordano Joseph
Hey David A.
Ullah Akm E.
Yeadon Loria B.
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