A Microring Resonance Wavelength Search Method Based on Differential Evolution

Abstract

The invention discloses a micro-ring resonance wavelength search method based on differential evolution. The method includes a global rough search and a local fine search. The rough search and the fine search have the same steps, but different initial conditions and exit judgment conditions; The search includes the following steps: S1, initialize the population, set the number of individuals in the population and initialize the heating power corresponding to each individual, collect the output power values ​​of the micro-ring through-end corresponding to all individuals in the initialization population, and set the through-end power threshold; S2, mutation operation Generate a new parameter; S3, crossover operation; S4, collect the power value of the straight end of all individuals in the population; S5, select operation, compare the power value of the straight end of the current population and the previous generation population and select the latest generation population; S6, judge Whether the termination condition is met. The invention uses the differential evolution algorithm for the resonance wavelength search in the wavelength locking process of the micro-ring resonant cavity, reduces the search times, and improves the search precision and speed.

Description

technical field [0001] The invention belongs to the technical field of resonance wavelength search, and in particular relates to a micro-ring resonance wavelength search method based on differential evolution. Background technique [0002] Due to its spectral selectivity, compact footprint and low power consumption, microrings are used in many fields such as lasers, filters, switches, modulators, wavelength multiplexers / demultiplexers, etc. in the field of photonic integration. After the light wave is coupled into the microring, it continues to propagate along the ring waveguide. If the phase change of the light wave around the ring is exactly an integer multiple of 2π, or the optical path is exactly an integer multiple of the light wavelength λ, the light wave will be coherent in the ring. enhanced. Light that does not meet this condition will be directly output from the straight-through end of the straight waveguide because it cannot be coherently enhanced in the resonato...

AI Technical Summary

Problems solved by technology

That is, if the search step size is small, although higher accuracy can be achieved, it will take a long time; if the search step size is too large, although the scan time can be saved, it may cause the search for no resonance wavelength or the searched resonance wavelength. Peak wavelength accuracy is low

Therefore, the existing global scanning algorithm cannot meet the requirements of wavelength locking of photonic devices based on microring design in both accuracy and speed.

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