Transmitter optical subassembly with volume phase...

Details Transmitter optical subassembly with volume phase... Transmitter optical subassembly with volume phase...

2003-01-23

2011-11-01

Van Roy, Tod T (Department: 2828)

Coherent light generators

Particular resonant cavity

Specified output coupling device

C372S101000, C372S102000, C372S050100, C372S050230, C359S016000

Reexamination Certificate

active

08050308

ABSTRACT:
A means for optically coupling a semiconductor laser to an optical fiber is disclosed. In one embodiment, a volume phase holographic element is disposed on a light-emitting surface of a semiconductor laser. The volume phase holographic element acts as an aberration-corrector for a lens that is disposed between the semiconductor laser and the optical fiber. In this way, an inexpensive lens that is not aberration free can be used. In some embodiments, the volume phase holographic element converts a Gaussian light beam emitted by the semiconductor laser into an annular beam that is more suitable for long distance transmission in multimode fibers.

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Hariharan, P.; “Optical holography: Principles, techniques and applications” @ Cambridge University Press 1984 (pp. 42-45).
Wyrowski, Frank and Bryngdahl, Olof, “Digital holography as part of diffractive optics” [review received Feb. 1991]; Physics Department, University of Essen, 4300 Essen 1, Federal Republic of Germany; (pp. 1481-1571).
Logue, James and Chisholm, Marilynn L.; “General approaches to mask design for binary optics”; SPIE vol. 1052 Holographic Optics: Optically and Computer Generated (1989); (pp. 19-24).

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