Liquid crystal cells – elements and systems – Liquid crystal system – Variable or rotatable retarder used with other retarders to...
Reexamination Certificate
2007-11-20
2007-11-20
Nelms, David (Department: 2871)
Liquid crystal cells, elements and systems
Liquid crystal system
Variable or rotatable retarder used with other retarders to...
Reexamination Certificate
active
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.
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Liu Yongsheng
Yuan Haijun
Zhao Xingzhong
Avanex Corporation
Nelms David
Patterson & Sheridan LLP
Vu Phu
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