A design method of all-optical switch with chirped structure and low-threshold bistable state

Abstract

The invention discloses a designing method of a chirp structure low-threshold bistable all-optical switch. Due to the introduction of chirp, the Bragg wave number in the bistable switch axially changes, then the resonance frequency of incident light in the same frequency is reduced, internal feedback is weakened, the transmittance of an upper branch of a bistable ring is lowered, and finally the threshold of the switch is reduced. The optical switch can adopt CdSxSel-x glass as materials, and is obtained by using the ion exchange technology, the holographic lithography and the ion-beam etching technology. By introducing the refractive index distribution in the mode of chirp, the optical bistable state with a lower threshold is obtained, and therefore the all-optical switch with better performance is achieved. According to the designing method of the chirp structure low-threshold bistable all-optical switch, the dielectric constant is continuously adjustable by utilizing semiconductor doping, the all-optical switch with a lower threshold is obtained, and the all-optical switch has the advantages of being simple in structure, convenient to operate and the like.

Description

technical field [0001] The invention relates to an all-optical switch, more specifically, it relates to a design method of an all-optical switch with a low-threshold bistable state of a chirp structure. Background technique [0002] With the rapid development of optical communication technology, all-optical switching has become a necessary basic device for digital optical communication and all-optical networks. The research on all-optical components, especially all-optical switches, is a research hotspot in recent years. Optical bistability (Optical Bistable: OB) refers to the phenomenon that the optical signal undergoes a controlled transition by controlling the two different output states of the optical system, high and low, by controlling light. From a physical point of view, the phenomenon of optical bistability is similar to logic gates widely used in electronic devices. Compared with electronic devices, optical bistability has the advantages of fast switching speed, ...

AI Technical Summary

Problems solved by technology

As mentioned above, there have been many studies on placing nonlinear media in the photonic crystal dielectric structure to obtain optical bistability, but the methods and structures used are relatively complicated and the cost of implementation is high.

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