Polarization-insensitive array waveguide grating wavelength division multiplexing device

Abstract

The invention discloses a polarization-insensitive array waveguide grating wavelength division multiplexing device which comprises one or multiple input waveguides, an input slab waveguide, multiple array waveguides, an output slab waveguide and one or multiple output waveguide, wherein one end of each of array waveguides is connected with the input slab waveguide, and the other end of each of array waveguides is connected with the output slab waveguide; a forward direction single polarization mode converter is arranged between each input wave guide and the input slab waveguide and a reverse direction single polarization mode converter is arranged between each output waveguide and the output slab waveguide. The polarization-insensitive array waveguide grating wavelength division multiplexing device is simple in structure and convenient to design, and does not need to specially design parts, such as a slab waveguide zone and a waveguide array; and a standard process for making the array waveguide grating is just needed without introducing extra complex processes, and the device is not sensitive to the process deviation. The polarization-insensitive array waveguide grating wavelength division multiplexing device is suitable for N*N array waveguide grating, and is also suitable for the situation of a large amount of channels.

Description

technical field [0001] The invention relates to a planar optical waveguide integrated device, in particular to a polarization-insensitive arrayed waveguide grating wavelength division multiplexing device. Background technique [0002] Arrayed waveguide grating is one of the most representative integrated wavelength division multiplexing / demultiplexing devices. [0003] 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 (such as figure 1 As shown), 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 waveg...

AI Technical Summary

Problems solved by technology

In recent years, people have made continuous efforts to actively explore new polarization compensation methods suitable for silicon nanowire arrayed waveguide grating devices, mainly in the following categories: (1) Using the polarization beam splitting, rotation, and coupling functions of two-dimensional photonic crystal vertical coupling gratings , the incident light of two polarization states is separated and coupled to the TE mode of the silicon nanowire in two directions, and at the same time, the polarization-insensitive silicon nanowire waveguide is realized by using the bidirectionality of the arrayed waveguide grating [Optics Express, 15 ( 4): 1567-1578, 2007], although this method is more ingenious, it is only suitable for the situation where the input and output are directly coupled with the optical fiber, which has great limitations and is not suitable for integration with other devices on the chip; (2 ) The method proposed by the inventor several years ago: Introduce a grating-type online polarization beam splitter into the arrayed waveguide of the reflective arrayed waveguide grating, and realize a polarization-insensitive device by introducing different optical paths for the TE and TM modes. Without the introduction of additional processes, better compensation effects can be achieved, but more precise control of the waveguide size is required during the fabrication process [IEEE Journal of Quantum Electronics, 45(6): 654-660, 2009]; (3) National The invention patent "A method for uniform polarization compensation of arrayed waveguide grating" (ZL) is to compensate the polarization sensitivity of the device by introducing a special-shaped slab waveguide area, but there is a small process tolerance and it is not suitable for N×N arrayed waveguide gratings , Not suitable for large number of channels and other shortcomings

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