Polarized-holographic filtering providing improved...

Details Polarized-holographic filtering providing improved... Polarized-holographic filtering providing improved...

2005-02-08

2005-02-08

Chan, Jason (Department: 2633)

Optical communications

Optical communication over freee space

Transmitter and receiver

C398S128000, C398S129000, C398S131000, C359S015000, C359S019000, C359S029000

Reexamination Certificate

active

06853812

ABSTRACT:
A filtering technique for free space communication that features an improved extinction ratio by providing a filter that employs a bulk holographic transform function and a polarizing film. In this manner, a greater number of channels of communication may be provided in a unit volume while preventing unwanted cross-talk between the communication channels. To that end, the system includes a source of energy to direct energy along a path, a detector disposed in the path, and a filter. The filter has a surface upon which a polarizing film is disposed and a holographic transform function recorded throughout a volume thereon.

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