POLARIZATION INSENSITIVITY SLAB WAVEGUIDE, MULTIPLEXER/DEMULTIPLEXER AND METHOD FOR MAKING POLARIZATION INSENSITIVITY SLAB WAVEGUIDE

摘要

The present invention relates to an optical element used in the optical band transmission network, and in particular, to an optical device and its manufacturing method having improved polarization compensation of the optical signal. ; Polarization in accordance with an embodiment of the present invention to them independently of the slab waveguide, the optical waveguide region of the optical waveguide is formed in the signal input to the upper side of a substrate; And forming on the other side the upper portion of the substrate and comprising: a polarization compensation area to compensate for the polarization of the optical signal is input from the optical waveguide region which is reflected and diffracted by the diffraction grating, the optical waveguide region is, in turn to a side upper portion of the substrate includes a lower cladding layer, the first core layer and the upper cladding layer is formed, the polarization compensation region is, the lower clad layer extending from the optical waveguide region formed in order on the other side top portion of the substrate, a first core layer, the upper clad layer and by a second core layer formed between the first core layer and the upper clad layer, the present invention provides an optical device having an improved reliability as compared with the conventional polarization compensated optical element. ; Slab waveguide, a multiplexer, a diffraction grating, a polarization compensation