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US RE37,051 E1Granted
Semiconductor gain medium with multimode and single mode regions
AssigneeSDL, Inc.
InventorsDavid F. Welch, David G. Mehuys, Donald R. Scifres
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Abstract
A semiconductor gain medium has an optical cavity comprising a multimode region permitting propagation of light with a diverging phase front and a single mode region. An optical cavity is formed by optical feedback within the medium. Preferably, the feedback comprises a combination of a cleaved facet and a grating. The gain medium may be an amplifier or, in addition to the amplifier, may include a resonator cavity, or operate as an unstable resonator.
Claims8
A semiconductor gain medium comprising:
- a multimode region having a gain portion and providing light propagation with a diverging phase front to a first reflector comprising a cleaved facet;
- at least one single mode region having a first end coupled to a first end of said multimode region opposite said first reflecting surface reflector and having at a second end a second reflector comprising a grating reflector formed in said single mode region;
- and
- an optical cavity formed between said first and second reflectors.
1 more element
Dependencies are inferred from the claim text.