Cholesteric liquid crystal cell devices and systems

Details Cholesteric liquid crystal cell devices and systems Cholesteric liquid crystal cell devices and systems

2006-04-25

2006-04-25

Nguyen, Dung T. (Department: 2871)

Optical waveguides

With optical coupler

Switch

C385S016000, C385S018000, C349S196000

Reexamination Certificate

active

07035501

ABSTRACT:
Cholesteric liquid crystal cell units are used for reflecting or transmitting incident light responsive to control signals. A cholesteric liquid crystal cell unit has a first cholesteric liquid crystal cell and a second cholesteric liquid crystal cell. The second cholesteric liquid crystal cell respectively reflects or transmit lights from the first cholesteric liquid crystal cell responsive to a control signal when the first cholesteric liquid crystal cell reflects circularly polarized light of one state or transmits the incident light. In one embodiment of the cell unit, a π-phase waveplate element is located between the first and second cholesteric liquid crystal cells. With the cholesteric liquid crystal cell units, devices such as optical switches, and WDM add/drop multiplexers, and optical switch systems with arrays of input and output optical fibers between a switching matrix formed by the cholesteric liquid crystal cell units, may be constructed.

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