Tunable filter for optical add/drop module

Details Tunable filter for optical add/drop module Tunable filter for optical add/drop module

2005-06-21

2005-06-21

Assaf, Fayez G. (Department: 2872)

Optical: systems and elements

Light interference

Electrically or mechanically variable

C359S583000, C359S589000, C359S494010, C359S490020

Reexamination Certificate

active

06909549

ABSTRACT:
A tunable filter includes a polarizing beam splitter and a half-wave plate that produce two equally polarized beams from an arbitrarily polarized input light. The polarized beams are directed toward a tunable component that consists of an optical substrate coated with a filter and a reflective element on its back and front surface, respectively. The pass and stop beams emerging from the tunable component are retro-reflected by roof structures and passed again through the filter. As a result of this combination of components, the filter's performance is not dependent on polarization and the filter's output channels are not shifted or deviated by tuning.

REFERENCES:
patent: 2002/0145803 (2002-10-01), He et al.

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