Mode beam-splitting converter based on grating-assisted coupler

Abstract

The invention discloses a mode beam-splitting converter based on a grating-assisted coupler. The converter comprises a single-mode input waveguide, an input mode converter, a bus multi-mode waveguide, a downlink Bragg waveguide grating, an output mode converter, a single-mode output waveguide, a downlink single-mode waveguide and a downlink coupling zone, wherein the input mode converter converts a TM (transverse magnetic) mode in the single-mode input waveguide into a TE (transverse electric) first-order mode in the bus multi-mode waveguide, and by the aid of the Bragg waveguide grating assisted coupler, the TE first-order mode of the multi-mode waveguide and the TE mode of the single-mode waveguide exchange energy. The converter realizes separation of the TE mode and the TM mode which are transmitted in the waveguide, converts the TM mode into the TE mode and has the advantages of simple structure, compactness, large work bandwidth, low crosstalk and the like, the production technology has CMOS (complementary metal-oxide-semiconductor) technology compatibility, the device is easy to integrate and extend, low-cost production is facilitated, and the device can be widely applied to on-chip high-density-integrated optical interconnection systems.

Description

technical field [0001] The invention relates to an integrated optical mode beam splitting conversion device, in particular to a mode beam splitting converter based on a grating-assisted coupler. Background technique [0002] With the rapid development of today's society, people's demand for network data volume continues to increase, so the requirement to increase the speed of communication networks has become an urgent problem to be solved. Optical communication networks have achieved great success and are currently moving towards the goal of low cost, large capacity and high speed. Now the optical transport network of 40Gb / s has been widely used, and the optical network of 100Gb / s is in the vigorous development stage. A consensus has been reached on the adoption of a standardized codec method in an optical network with a speed exceeding 100Gb / s. This codec method is based on the coherent reception dual-polarization quadrature phase-shift keying modulation technique (PM-QPS...

AI Technical Summary

Problems solved by technology

The mode converters currently proposed are mainly based on two structures: the first is the directional coupler structure, which can realize the separation and conversion of the two modes through the effective refractive index matching method, but its disadvantage is that there is a strict beat The length of the device needs to be carefully controlled; the second is based on the combination of a graded waveguide and a directional coupler. This structure first converts the TM fundamental mode into the TE first-order mode of the multimode waveguide through the graded waveguide, and then Then it is converted to the TE fundamental mode of another waveguide through a directional coupler, the structure still has a strict coupling length, and the process tolerance is small

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