Patent ID: 8654332

Claim:
A method of manufacturing a chip-scale optics module for an optical interrogator, comprising: aligning a polarization axis of a linear polarizer to an angle of 45 degrees from a fast axis of a quarter wave plate to enable circular polarization of a beam, when a beam is introduced to said linear polarizer; coupling said linear polarizer to said quarter wave plate after said aligning to form a circular polarizing filter sheet; dicing said circular polarizing filter sheet to obtain a plurality of chip-scale circular polarizing filters, each of said chip-scale circular polarizing filters having an edge to define a polarization location index for said linear polarizer; positioning a linear polarizer plate face of one of said chip-scale circular polarizing filters so that said linear polarizer plate face is aligned with and parallel to an output face of a laser, whereby the polarization axis of said linear polarizer is not orthogonal to a polarization axis of said laser; and coupling said chip-scale circular polarizing filter to a frame after said positioning step.