Polarization insensitive array wave-guide grating

Abstract

The invention discloses a polarization insensitive array waveguide grating, which comprises an input waveguide, an input planar waveguide, two groups of array waveguides with independent parameters, an output planar waveguide and an output waveguide, wherein the input planar waveguide includes a polarization beam splitter; the output planar waveguide includes a polarization beam combiner; one ends of the first group and the second group of array waveguides are respectively connected with the input waveguide through the input planar waveguide; and the other ends of the first group and the second group of array waveguides are respectively connected with the output waveguide through the output planar waveguide. By adopting the two groups of array waveguides with independent parameters, the invention can independently select the parameters of the array waveguide respectively for transverse electric mode and transverse magnetic mode, thus simultaneously eliminating the channel spacing and the polarization dependence of a center channel wavelength. The invention overcomes the limitation of conventional polarization compensation technique that fails to eliminate polarization sensitivity of the channel spacing. The invention has the advantages of simple structure and convenient design, and only needs the standard process for fabricating the array waveguide grating without introducing any extra complex process.

Description

technical field [0001] The invention relates to a polarization-insensitive arrayed waveguide grating, which belongs to the field of planar optical waveguide integrated devices. Background technique [0002] Arrayed waveguide grating is a typical integrated wavelength division multiplexing / demultiplexing device. The traditional arrayed waveguide grating is composed of input waveguide 1, input slab waveguide 2, arrayed waveguide 4, output slab waveguide 6 and output waveguide 8. (See Figure 1), the composite light is incident from the input waveguide, enters the slab waveguide and propagates divergently, and then couples to each waveguide in the waveguide array. Adjacent arrayed waveguides have a certain optical path difference, so that different phase differences are generated for light of each wavelength, and the dispersion function of the grating is realized. After passing through the output slab waveguide, the light of different wavelengths converges on different points o...

AI Technical Summary

Problems solved by technology

However, the traditional polarization compensation technology can only eliminate the polarization dependence of the central wavelength, and is not suitable for silicon nanowire arrayed waveguide gratings.

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