Mode multiplexing demultiplexer based on silicon-based optical waveguide mode matching

Abstract

The invention provides a mode multiplexing demultiplexer based on silicon-based optical waveguide mode matching. When the mode multiplexing demultiplexer is used as a multiplexer, the mode multiplexing demultiplexer comprises n strip-shaped waveguides different in width and adopted as input optical waveguides, wherein the 0-th input optical waveguide (10) is a single-mode optical waveguide and the tail end of the single-mode optical waveguide is sequentially connected with a conical optical waveguide (20), a multi-mode optical waveguide (30) and a multiplexer output end (40). The tail end of the n-th input optical waveguide (1n) is sequentially connected with an S-shaped curved optical waveguide structure (2n), a coupling region optical waveguide (3n), a second S-shaped curved optical waveguide structure (4n), a small-section straight waveguide (5n) and a conical waveguide (6n). When the mode multiplexing demultiplexer is used as a demultiplexer, the output end and the input end of the multiplexer are exchanged with each other according to the reversibility of the optical path. Therefore, the mode demultiplexing can be realized. In this way, the mode multiplexing demultiplexer becomes a demultiplexer. The mode multiplexing demultiplexer is simple in structure and high in mode conversion efficiency, which enables the multiplexing and the demultiplexing of the TE mode and the TM mode.

Description

technical field [0001] The invention relates to optical communication mode multiplexing technology, in particular to a mode multiplexing demultiplexer. Background technique [0002] With the development of network business, people have more and more demands on optical fiber communication capacity, and an effective way to increase long-distance communication capacity is to use wavelength division multiplexing (WDM) technology. However, the wavelength division multiplexing system needs expensive components such as multi-channel lasers or tunable lasers, so the cost is very high, which largely limits its wide application in optical communication systems. Moreover, due to the limitation of the inherent nonlinear effect of the single-mode optical fiber itself, the transmission capacity of the single-mode optical fiber is close to the limit, which cannot meet people's increasing demand for information. Therefore, mode multiplexing technology is proposed to transmit different info...

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Problems solved by technology

Literature [Dai D, Wang J, Shi Y, "Silicon mode (de) multiplexer enabling high capacity photonic networks-on-chip with a single-wavelength-carrier light", Optics Letters (2013) 1422-1424] gives a A mode multiplexer based on multi-level mode coupling, but its structure involves multiple tapered optical waveguides and needs to strictly control the front and rear widths of the tapered waveguides, so the structure is relatively complicated

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