Cascade silicon-based waveguide optical isolator

Abstract

The invention provides a cascade silicon-based waveguide optical isolator. The two-stage time-dependent perturbation structure and the two-stage filtering structure can realize the optical signal isolation of the two frequencies. The dual-frequency independent isolation is realized through utilizing the selection frequency of the unparallel portion of two different energy bands in the waveguide dispersion relation in order to realize the dual-frequency independent isolation, and the mutual interaction does not happen in the signal isolation process. The time-dependent perturbation structure is used for coupling the two optical signals of two specific frequencies which is in the forward propagation along the waveguide as the two optical signal of the target frequency which is in the forward propagation along the waveguide; and the specific frequency filtering structure which is in successive series is used for absorbing two target frequency optical signal which is in the forward propagation along the waveguide. The perturbed structure and the filtering structure do not produce effect on the two optical signal with specific frequencies which are propagated in the opposite directions. The scale of the optical isolator is in the micron dimension and is applicable to the mass integration and has no requirement for the signal strength.

Description

technical field [0001] The invention relates to a dual-frequency silicon-based optical isolator, which is suitable for optical fiber communication and integrated optical system, in particular to a silicon-based optical isolator capable of realizing unidirectional propagation of optical signals at two frequencies and nearby frequencies. Background technique [0002] An optical isolator is a passive optical device that allows one-way transmission of optical signals in an optical propagation medium (device), and prevents the propagation of reflected optical signals in optical fiber communication systems and large-scale integrated optical circuits. The working principle of common optical isolators is mainly based on the non-reciprocity and nonlinear effects of Faraday rotation. However, the optical isolator with Faraday rotation effect is not suitable for large-scale integration, and the optical isolator with nonlinear effect has additional requirements on the strength of the tr...

AI Technical Summary

Problems solved by technology

However, the optical isolator with Faraday rotation effect is not suitable for large-scale integration, and the optical isolator with nonlinear effect has additional requirements on the strength of the transmitted optical signal

Recently, the solution to achieve unidirectional propagation of optical signals by time-dependent perturbation of waveguides has attracted industry attention, but this method only has a high isolation rate for specific frequency optical signals

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