Multi-dimensional performance parameter simulation and analysis system for VCSEL chips

By combining a carrier-photon coupling model with an implicit Runge-Kutta algorithm, the problems of low computational efficiency and insufficient multi-mode competition modeling in VCSEL chip simulation are solved, achieving efficient and accurate performance analysis.

CN122287155APending Publication Date: 2026-06-26HUAXIN SEMICON TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUAXIN SEMICON TECH CO LTD
Filing Date
2026-05-27
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing VCSEL chip simulation methods suffer from low computational efficiency and severe numerical oscillations when dealing with strongly nonlinear systems, making it difficult to accurately reflect the true physical characteristics of the device. Furthermore, they lack effective modeling methods for multi-mode competition effects, leading to errors in high-speed modulation bandwidth prediction.

Method used

A coupled model of the carrier continuity equation and the multimode photon rate equation is constructed. An implicit Runge-Kutta algorithm combined with a local truncation error control strategy is adopted to dynamically adjust the time step. The relaxation oscillation frequency and damping factor are extracted through the prediction module to construct the frequency response function, which supports multi-dimensional scanning.

Benefits of technology

It significantly improves the numerical stability and computational efficiency of the simulation process, accurately simulates strong nonlinear coupling characteristics and multimode competition effects, provides reliable performance index curves, and provides data support for the optimized design of VCSEL chips.

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Abstract

This invention discloses a multi-dimensional performance parameter simulation and analysis system for VCSEL chips. The modulation bandwidth is obtained by fitting a frequency response function, which corresponds to the frequency point where the amplitude of the frequency response function drops to a preset proportion of the low-frequency amplitude. The module also analyzes the decay envelope of transient relaxation oscillations, extracts the damping ratio and resonant frequency, and constructs a bandwidth prediction function based on a damped resonance model. This bandwidth prediction function expresses the modulation bandwidth as a function of the resonant frequency and the damping ratio. The modulation bandwidth is proportional to the resonant frequency and is subject to nonlinear constraints of the damping ratio. The scanning module supports multi-dimensional scanning of injection current, temperature, and structural parameters, outputting current-voltage characteristic curves, optical power-current characteristic curves, modulation response curves, and eye diagrams. This invention achieves accurate prediction and visual evaluation of the high-speed performance of lasers.
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