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1. (WO2018165031) WAVELENGTH SHIFT INVARIABLE PRISM AND GRATING SYSTEM

Pub. No.:    WO/2018/165031    International Application No.:    PCT/US2018/020933
Publication Date: Fri Sep 14 01:59:59 CEST 2018 International Filing Date: Tue Mar 06 00:59:59 CET 2018
IPC: G02B 27/42
G02B 5/04
G02B 5/18
Applicants: OPLINK COMMUNICATIONS US DIVISION, LLC
Inventors: HU, Gongjian
ZHU, Tian
JI, Guijun
GONG, Lifu
Title: WAVELENGTH SHIFT INVARIABLE PRISM AND GRATING SYSTEM
Abstract:
An optical dispersion system through which optical signals pass in a medium includes a prism and a diffraction grating. The prism is formed of an optically transparent material and configured to refract a plurality of optical signals along a plurality of angles of refraction, with each optical signal being refracted along one of the angles of refraction. The diffraction grating is configured to receive the refracted plurality of optical signals at an angle of incidence and diffracts each optical signal into a plurality of sub-beams based upon a diffraction angle. The prism and diffraction grating are configured so that a change in each angle of refraction due to environmental changes in the medium compensates for a change in the angle of incidence due to the environmental changes in the medium to maintain the diffraction angle relatively constant.