A silicon-based multimode 3db beam splitter based on multimode interference coupler

Abstract

The invention discloses a silicon-based multimode 3dB beam splitter based on a multimode interference coupler and belongs to the field of an integrated photonic device. The beam splitter particularlycomprises a multimode input waveguide D1, an input region conical coupler E1, a multimode interference waveguide, two output region conical couplers and two multimode output waveguides in sequence from left to right, wherein the multimode input waveguide D1 is used for receiving an input light beam, a longitudinal distance between the multimode input waveguide D1 and the transverse central axis ofthe multimode interference waveguide, and the gradual change length and the gradual change maximum width of the input area conical coupler E1 are adjusted, a low-order guided mode in the multimode interference waveguide is excited, and the longitudinal distance between the multimode output waveguides and the gradual change length and the gradual change maximum width of the output area conical coupler are adjusted so that output light beams are outputted from the two multimode output waveguides. The beam splitter is advantaged in that a multi-mode interference coupler solves a problem that thequality of output light spots is reduced due to excitation of a high-order guided mode under the multi-mode input condition of the multi-mode interference coupler.

Description

technical field [0001] The invention belongs to the field of integrated photonic devices, and more specifically relates to a silicon-based multimode 3dB beam splitter based on a multimode interference coupler. Background technique [0002] In recent years, with the rise and development of artificial intelligence, big data, and cloud computing, people's demand for communication capacity, bandwidth, and speed has exploded. Optical interconnection technology is the most potential way to overcome communication network transmission bottlenecks. Among various optical interconnection schemes, silicon-based optical interconnection technology is considered to be the most promising scheme. Silicon waveguides have a large refractive index difference, and the size of the device structure can be reduced to submicron levels. Therefore, optical devices based on silicon-based micro-nano waveguides have a more compact device structure and can achieve higher density device integration. Optic...

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Problems solved by technology

[0005] Aiming at the defects of the prior art, the object of the present invention is to provide a silicon-based multimode 3dB beam splitter based on a multimode interference coupler, aiming at solving the problem of high-order guided modes of the multimode interference coupler under the condition of multimode input. The problem that the excitation causes the quality of the output spot to decrease

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