Coherent light generators – Particular active media – Semiconductor
Reexamination Certificate
2008-01-30
2010-11-09
Harvey, Minsun (Department: 2828)
Coherent light generators
Particular active media
Semiconductor
C372S020000
Reexamination Certificate
active
07830941
ABSTRACT:
An array of optically coupled cavities (called micro-cavities) of a semiconductor laser are defined by either an etch and/or by a native oxide of an aluminum-bearing III-V semiconductor material and are arranged serially end-to-end along the longitudinal direction. An etch and/or native oxide defines a refractive index change for the longitudinal optical mode and confines the optical field within the micro-cavities, resulting in reflection and optical feedback distributed periodically along the laser stripe in the form of an optically coupled micro-cavity. The wavelength of emission of the laser is controlled by a combination of the length of the optical micro-cavities and the spacing between adjacent optical micro-cavities. Single-longitudinal-mode operation is exhibited over an extended drive current range. In one embodiment, two or more linear arrays of end-coupled micro-cavities are arranged in the longitudinal axis of the laser cavity to obtain a tunable laser. The device, with multiple reflectors constructed out of optical micro-cavities, is tuned either thermally or by current injection partitioned among the elements. The tunable laser exhibits a vernier tuning amongst resonances of the two or more optically-coupled micro-cavities.
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McCallum David S.
Sugg Alan R.
Harvey Minsun
Patzik, Frank & Samotny Ltd.
Stafford Patrick
Vega Wave Systems, Inc.
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