Polarization insensitive array wave-guide grating

Abstract

The invention discloses a polarization insensitive array waveguide grating, which comprises an input waveguide, an output waveguide, a planar waveguide and a plurality of array waveguides, wherein the input waveguide and the output waveguide are positioned on the same side of the planar waveguide and are connected with the planar waveguide; the other side of the planar waveguide is connected with one end of each array waveguide; adjacent array waveguides have an optical path difference DeltaL1; the other ends of the array waveguides are sequentially connected with a polarization beam splitter and a reflector; connection waveguides are arranged between the polarization beam splitter and the reflector; and adjacent connection waveguides has an optical path difference DeltaL2. Due to the introduction of the polarization beam splitter, the connection waveguides and the reflector, two polarized light beams have different optical lengths, and the channel spacing and the polarization dependence of a center channel wavelength can be eliminated at the same time, thus overcoming the limitation of conventional polarization compensation technique. 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] Wavelength division multiplexing / demultiplexing is a key modern optical communication technology. Its function is to mix light of different wavelengths into composite light or to separate the light of each wavelength contained in the composite light. The device that realizes this function is the wavelength division multiplexing / demultiplexing device. 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 4, arrayed waveguide 3, output slab waveguide 5 and output waveguide 2. (See Figure 1), the composite light is incident from the input waveguide, enters the slab waveguide and propagates divergently, and then couples to each ...

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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