Diffractive optical element and bidirectional optical...

Details Diffractive optical element and bidirectional optical... Diffractive optical element and bidirectional optical...

2008-11-20

2010-11-16

Allen, Stephone B (Department: 2872)

Optical: systems and elements

Diffraction

From grating

C359S569000, C398S084000, C398S087000

Reexamination Certificate

active

07835081

ABSTRACT:
A diffractive optical element has a diffraction grating which multiplexes light beams of different wavelengths, and the diffraction grating has a binary structure in which the diffraction surface top part and the diffraction surface bottom part repeat a concave and convex shape through a rising surface part along an optical axis direction P. The diffraction surface top part and the diffraction surface bottom part are inclined to the rising surface part. By this diffractive optical element, the diffraction angle of the light beam is maintained, and the diffraction efficiency of the light beam can be improved. By using this diffractive optical element in an optical communication module, while the separation angle of the light beam of the different wavelength is maintained, the signal receiving performance is increased.

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patent: 7-104154 (1995-04-01), None
patent: 7-261054 (1995-10-01), None
patent: 2003-344715 (2003-12-01), None

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