Adjustable light delay line of silicon-based coupling waveguide and method for regulating and controlling light delay

Abstract

The invention discloses an adjustable light delay line of a silicon-based coupling waveguide. The adjustable light delay line comprises a runway type silicon waveguide structure, an input waveguide, an output waveguide and a delay regulation and control part which are arranged on the upper surface of an SOI substrate. If the phases are matched, the energy exchange can reach 99.9% in two parallel and adjacent coupling waveguides with the same parameters and almost no loss according to the coupling wave principle. After the two waveguides are coupled with each other, the optical signal can be continuously transmitted in the multi-ring runway type structure, thereby generating an optical delay effect. Regulation and control of light delay time are realized by utilizing the characteristics ofthe phase-change material GST. The adjustable light delay line can still enable the output bandwidth to be large on the premise that the structure is compact, and integration is better facilitated; the loss is only 2.96 dB, the delay time reaches 58.8 ps, multi-stage regulation and control can be achieved according to requirements and the overall size is only 0.006 mm < 2 >.

Description

technical field [0001] The invention belongs to the field of silicon-based photonics, and in particular relates to a silicon-based coupling waveguide adjustable optical delay line and an optical delay method. Background technique [0002] Silicon-based photonic devices are research hotspots in recent years, and the delay of optical signals is a basic function in time-domain optical signal processing. Photons cannot be stored, so optical buffering is achieved by delaying the optical signal for a period of time in a light-guiding medium. "Optical cache" can start from two aspects: one is to slow down the propagation speed of light; the other is to extend the optical transmission path. There are two types of all-optical buffers currently proposed: one is slow-optical all-optical buffers; the other is optical fiber delay line or optical fiber ring all-optical buffers. The EIT technology uses the quantum coherence effect to eliminate the influence of the medium in the process o...

AI Technical Summary

Problems solved by technology

However, the EIT technology uses the quantum coherence effect to eliminate the influence of the medium in the process of electromagnetic wave propagation. The experimental system is complex, the cost is expensive, and it is difficult to realize at room temperature.

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