公开(公告)号：US20230393445A1

公开(公告)日：2023-12-07

申请号：US17805342

申请日：2022-06-03

Applicant: II-VI Delaware, Inc.

Inventor： Helen Chen ,  Guomin Jiang ,  Tom Li ,  Lawrence Wang ,  Jim Yuan

IPC: G02F1/29 ,  G02F1/313 ,  H04J14/02 ,  H04Q11/00

CPC classification number: G02F1/292 ,  G02F1/3131 ,  H04J14/0212 ,  H04Q11/0005 ,  G02F2201/305 ,  H04Q2011/0018

Abstract: In a wavelength selective switch, an input port transmits an input beam, and diffraction grating disperses the input beam into optical channels. A liquid-crystal-on-silicon (LCoS) switch assembly has a phase grating profile and has addressable pixels, which are liquid crystal based. The LCoS switch assembly can selectively direct first-order diffracted beams of the optical channels for output to selected output ports. A tunable optical wedge adjacent the LCoS switch assembly can direct higher-order diffraction beams in the space between the output ports to reduce crosstalk. The wedge is a liquid crystal cell having spaced-apart resistive layers and having liquid crystal material disposed between the layers. In the wedge, the liquid crystal material can produce a phase profile in response to bias voltages applied to the resistive layers, and a beam steering angle of the phase profile can direct at least the second-order diffracted beams towards the port spacing between the ports.