Ii-vi Delaware, Inc.

Lixin (Lawrence) Wang

Jack Robert Kelly

Haiji J Yuan

Helen Chen

Guomin Jiang

Qingyu (Tom) Li

Kun Gao

Xinran Wang

A two-step optimization process is utilized to define an optimal phase profile for a LCoS spatial light modulator. The two-step optimization process first utilizes a nonlinear constrained optimization (NCO) program to determine the specific parameters required to obtain an optimal phase profile (hologram), where the 'optimal phase profile' is typically defined as that profile which achieves maximum diffraction efficiency for optical switching. Following this first step, phase scaling (and perhaps an adjustment in the number of pixels per period) is employed to slightly modify the values of the optimal phase profile to effectively suppress crosstalk peaks. If any orders still exhibit an unacceptable level of crosstalk, these orders are then subtracted from the phase profile to create the final design.

Optimization of wavelength selective switch using phase control of liquid crystal spatial light modulator

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Fremont, CA, United States of America

Lixin (Lawrence) Wang