Optical module with high reflection isolation and compact size

Details Optical module with high reflection isolation and compact size Optical module with high reflection isolation and compact size

2004-06-18

2008-08-12

Font, Frank G (Department: 2883)

Optical waveguides

With optical coupler

Switch

C385S024000, C385S046000

Reexamination Certificate

active

07412124

ABSTRACT:
Techniques for designing optical devices with high reflection isolation are disclosed. According to one aspect of the devices, a pair of conjugate optical filters is used. To preserve the performance of the filters and minimize insertion loss, a lens has a first side and a second side, the first side being preferably perpendicular to an optical axis of the lens, and the second side being nearly perpendicular to the optical axis of the lens. Thus one of the conjugate optical filters is deposed towards the first side of the lens and the other one of the conjugate optical filters is deposed towards the second side of the lens. When a reflected light from one filter, presumably carrying residuals of a transmitted signal, hits another filter, the residuals are blocked, resulting in great isolation for the R-channel from the T-channel.

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