Patent ID: 11899203
Assignee: JIAXING UPHOTON OPTOELECTRONICS TECHNOLOGY CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC F  G

Claim 3:
4. The design method of claim 3, wherein the optimizing grating parameters of the coupling-in grating further comprises:
determining optimization ranges of the grating parameters according to initial grating parameters and the wavelength of the light beam;
calculating diffraction efficiencies at different coupling-in angles according to a maximum diffraction coupling-in angle and a set coupling-in angle step length;
calculating a mean diffraction efficiency and a non-uniformity parameter of the coupling-in grating according to the diffraction efficiencies at different coupling-in angles; and
obtaining an optimized grating period, modulation depth, and duty ratio of the coupling-in grating by taking the mean diffraction efficiency and the non-uniformity parameter as optimization objectives.