Patent ID: 9547276
Date: 2017-01-17
CPC Classifications: G02B,G02F,G03H,H04Q

Claim:
1. An LCOS (liquid crystal on silicon) telecommunications light beam routing device employing polarization diversity, the device comprising: an optical input; one or more optical outputs; a first LCOS spatial light modulator (SLM) in an optical path between said input and said output, for displaying a kinoform; a second LCOS SLM; an optical system to selectively direct light of different polarizations to different respective of said first and second SLMs, each displaying a respective said kinoform, and to combine said light of different polarizations from said respective first and second SLMs to selectively provide the combined light to said one or more optical outputs; a data processor, coupled to said first and second LCOS SLMs, configured to provide kinoform data for displaying said kinoform on said first and second LCOS SLMs; wherein said kinoform data defines a kinoform which routes a beam from said optical input to a selected said optical output; wherein said data processor is configured to input routing data defining said selected optical output and to calculate said kinoform data for routing said beam responsive to said routing data; and wherein said data processor is configured to calculate said kinoform data by: determining an initial phase pattern for said kinoform; calculating a replay field of said phase pattern; modifying an amplitude component of said replay field to represent a target replay field for said beam routing, retaining a phase component of said replay field to provide an updated replay field; performing a space-frequency transform on said updated replay field to determine an updated phase pattern for said kinoform; and repeating said calculating and updating of said replay field and said performing of said space-frequency transform until said kinoform for display is determined; and outputting said kinoform data for display on said first and second LCOS SLMs.