Rectangular waveguide mode conversion device

Abstract

The invention provides a rectangular waveguide mode conversion device. The rectangular waveguide mode conversion device is composed of an auxiliary waveguide, a main waveguide and cladding. The main waveguide can support M kinds of mode transmission, wherein M is greater than or equal to 2; the auxiliary waveguide only supports basic mode transmission. One end of the auxiliary waveguide intersectsthe side face of a main fiber core, and at the other end of the auxiliary waveguide, the distance between the centers of the two waveguides is greater than half of the sum of the widths of the two waveguides. Not only is mutual conversion between an E12 mode and an E22 mode achieved, but also the patterns supported in the main waveguide can be completely and efficiently converted into other modes under the same structure. Parameters of the auxiliary waveguide and main waveguide meet the condition that the effective refractive index of a basic mode of the auxiliary waveguide is greater than that of an arbitrary mode in the main waveguide. According to the novel rectangular waveguide mode conversion device, conversion between low-order optical wave modes and high-order optical wave modes can be achieved.

Description

technical field [0001] The invention relates to the field of optical fiber communication, in particular to a rectangular waveguide mode conversion device capable of realizing conversion between low-order modes and high-order modes. Background technique [0002] In recent years, the transmission capacity of single-mode optical fiber is approaching the limit value day by day. People gradually shift their attention to few-mode optical fiber communication. Coupling different information to different modes can achieve the purpose of doubling the transmission capacity. Few-mode waveguide devices that can realize inter-mode conversion and multiplex different modes into few-mode fiber in few-mode fiber communication are one of the key factors that determine system performance. A mode converter is an optical device that converts between different modes. In recent years, with the rapid development of optical fiber communication, some optical fiber transmission systems, such as space d...

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Problems solved by technology

The existing waveguide structure can also achieve mode separation, but the structure is relatively complicated [ Opt. Express , 2013, 21(15): 17904-17911, Opt. Express ,2013, 21(17): 20220-20229], the function is single, and the mutual conversion of the modes cannot be realized, which limits the utilization rate of the rectangular waveguide

The traditional mode converter can only realize the conversion from one mode to another fixed mode, which has poor flexibility

[0004] In summary, a mode converter that can flexibly implement conversion between multiple modes and has a simple structure has yet to be developed.

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