Planer guided wave road reflected type diffraction grating

摘要

It regards the planer guided wave road reflected type diffraction grating which as for this invention, as improvement of the bandwidth which surpasses to the former planer guided wave road reflected diffraction grating is actualized, the polarized light dependence loss which usually accompanies that (PDL) you lose, is used with optical device such as wave length divided multiplexer. Therefore, because degree (3), high aspect ratio (10) the lattice, uses low under the incidence angle 15 the very short side wall (under wave length of the light information) it has.