A silicon-based coupling waveguide adjustable optical delay line and method for adjusting optical delay

Abstract

The invention discloses a silicon-based coupling waveguide adjustable optical delay line, which comprises a racetrack silicon waveguide structure arranged on the upper surface of an SOI substrate, input and output waveguides and a delay control part. According to the coupled wave principle, that is, in two parallel adjacent coupled waveguides with the same parameters and almost no loss, if the phases are matched, the energy exchange can reach 99.9%. After the two waveguides are coupled to each other, the optical signal can be continuously transmitted in the multi-ring racetrack structure, thereby producing an optical delay effect. The characteristics of the phase change material GST are used to realize the control of the light delay time. The dimmable delay line can still make the output bandwidth larger under the premise of compact structure, which is more conducive to integration; the loss is only 2.96dB, the delay time reaches 58.8ps, and multi-level regulation can be realized according to the demand , the overall size is only 0.006mm 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.

Images