Patent ID: 9134479
Filing Date: 2015-09-15
Classification: G02B

Abstract:
1. An optical demultiplexing system comprising: a polarization splitter portion operative to receive an input optical signal having a first polarization, a second polarization and multiple channels, and split the input optical signal into a first optical signal having the first polarization and a second optical signal having the second polarization; a polarization rotator portion communicatively connected to the polarization splitter portion, the polarization rotator portion operative to receive the first optical signal, rotate the first polarization of the first optical signal to substantially match the second polarization of the second optical signal and output the first optical signal; a focal point at an input free space region that receives the second optical signal and the rotated first optical signal prior to being multiplexed, and combines the second optical signal and the rotated first optical signal, each having the matching polarization, to generate a multi-mode optical field; and an optical demultiplexing portion communicatively connected to the polarization rotator portion and the polarization splitter portion, the optical demultiplexing portion disposed downstream from the focal point and operative to receive the combined first optical signal and the second optical signal from the focal point, and to output each channel of the first optical signal and the second optical signal to a photodetector device corresponding to each channel.