Optical: systems and elements – Optical modulator
Reexamination Certificate
2005-11-29
2005-11-29
Epps, Georgia (Department: 2873)
Optical: systems and elements
Optical modulator
C385S122000, C385S037000
Reexamination Certificate
active
06970276
ABSTRACT:
An apparatus and method for nonlinear frequency mixing of light waves relying on a nonlinear material having a nonlinear coefficient d and a waveguide fabricated in the nonlinear material. The waveguide is equipped with a quasi-phase-matching (QPM) grating extending along the length of the waveguide and endowed with an asymmetry of the nonlinear coefficient d along the width of the waveguide. The transverse asymmetry is chosen to establish a mode overlap for nonlinear frequency mixing between different transverse width modes of light. The transverse asymmetry can be odd or else neither odd nor even so as to establish mode overlap for frequency mixing between even transverse width modes and odd transverse width modes. The QPM grating can have single or multiple grating stripes that can be staggered, interleaved, angled and otherwise altered to achieve the transverse asymmetry establishing a mode overlap for frequency mixing between even transverse width modes and odd transverse width modes.
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Fejer Martin M.
Kurz Jonathan R.
Epps Georgia
Hasan M.
Lumen Intellectual Property Services Inc.
The Board of Trustees of the Leland Stanford Junior University
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