Liquid crystal device and method for optical performance...

Liquid crystal cells – elements and systems – Liquid crystal system – Variable or rotatable retarder used with other retarders to...

Reexamination Certificate

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Reexamination Certificate

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10637115

ABSTRACT:
A liquid crystal optical performance monitor is described that employs a liquid crystal tunable filter for receiving a P-polarization beam and a rotated S-polarization beam from a C-polarizer. The rotated S-polarization beam from a birefringent crystal in C-polarizer propagates through a waveplate which rotates the polarization by 90 degrees, resulting in the rotated S-polarization beam having the same polarization orientation as the P-polarization beam. The liquid crystal tunable filter therefore receives just the P-polarization orientation. The C-polarizer and a small beam collimator are rotated so that the polarization orientation of the P-polarization beam and the rotated S-polarization beam matches the orientation of the LC inside the LC cavity of the LC tunable filter. In a first embodiment, the liquid crystal optical performance monitor is implemented with a photodiode. In a second embodiment, the liquid crystal optical performance monitor is implemented with a bi-cell photo diode.

REFERENCES:
patent: 5666174 (1997-09-01), Cupolo, III
patent: 6208774 (2001-03-01), Sorin et al.
patent: 6522467 (2003-02-01), Li et al.
patent: 6680797 (2004-01-01), Juday
patent: 2002/0122444 (2002-09-01), Tsai
patent: 2003/0035605 (2003-02-01), Bouevitch et al.
patent: 2003/0103718 (2003-06-01), Chen
patent: 2003/0194165 (2003-10-01), Silberberg et al.

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