Variable optical attenuator and optical filter

Details Variable optical attenuator and optical filter Variable optical attenuator and optical filter

2007-07-31

2007-07-31

Sangahvi, Hemang (Department: 2874)

Optical waveguides

Accessories

Attenuator

C385S011000

Reexamination Certificate

active

11104633

ABSTRACT:
A variable optical attenuator includes an optical fiber on an incident side and an optical fiber on an emission side; a polarization rotator element that includes a liquid crystal layer and a pair of substrates that are arranged in such a manner that the liquid crystal layer is sandwiched between the substrates; and a Savart plate that is arranged between the optical fibers and the polarization rotator element. In the polarization rotator element, rotation of a polarizing direction is controlled by controlling a birefringence characteristic of liquid crystal, which is controlled by controlling alignment of the liquid crystal layer.

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patent: 6560396 (2003-05-01), Yan et al.
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patent: 7079320 (2006-07-01), Kewitsch
patent: 2004/0120683 (2004-06-01), Cohen
patent: 2001-13477 (2001-01-01), None

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