A silicon-based multimode helical waveguide delay line supporting low-loss fundamental mode transmission

Abstract

The invention discloses a silicon-based multimode helical waveguide delay line supporting low-loss fundamental mode transmission. A curvature gradual change type S bending multimode waveguide is placed at the centers of curvature gradual change type helical bending multimode waveguides; and two curvature gradual change type helical bending multimode waveguides are annularly and helically arranged,an inner end of one curvature gradual change type helical bending multimode waveguide is connected with one end of the curvature gradual change type S bending multimode waveguide through a bending waveguide, the other end of the curvature gradual change type S bending multimode waveguide is connected with the inner end of the other curvature gradual change type helical bending multimode waveguidethrough another bending waveguide, and the entire silicon-based multimode helical waveguide delay line is arranged in a central symmetry manner. The silicon-based multimode helical waveguide delay line disclosed by the invention can effectively avoid mode mismatch loss and inter-mode crosstalk caused by the abrupt curvature change of the traditional structure, and can reduce the scattering loss introduced by a waveguide sidewall, thereby obtaining low-loss fundamental mode transmission in the silicon-based multimode helical waveguide, and the silicon-based multimode helical waveguide delay line has the advantages of low loss and compact structure and the like, and can be applied to optical buffers, optical delay lines and other systems.

Description

technical field [0001] The invention relates to a silicon-based multimode helical waveguide delay line supporting low-loss fundamental mode transmission, more particularly to a silicon-based multimode helical waveguide delay line with low scattering loss fundamental mode transmission. Background technique [0002] With the development of photonic integration technology, many applications for photonic integration, such as: communication network filters and multiplexers, optical gyroscope angular velocity sensors, optical buffers and adjustable true delay lines, etc., these systems require light in The on-chip propagation distance is long or a resonant cavity with a high quality factor is required. The realization of the above performance requires that the total transmission loss of the modes in the planar optical waveguide should be small enough. [0003] In a planar optical waveguide, the total transmission loss of the mode is the sum of multiple losses including material a...

AI Technical Summary

Problems solved by technology

Therefore, the existing low-loss silicon-based micro-nano optical waveguides cannot simultaneously meet the technical requirements of long on-chip propagation distance, compact structure, and extremely small inter-mode mismatch loss.

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