研究目的
Investigating the ability of cavity solitons (CSs) in injection locked vertical-cavity-surface-emitting lasers to act as frequency mixers due to their nonlinear nature.
研究成果
The numerical experiments demonstrate that CSs in injected broad-area semiconductor lasers can serve as all-optical frequency mixers by generating different combined frequencies from those of input. The feasibility of this novel scheme is attributed to the nonlinear nature of CSs and the enhanced resonance frequency of injection locked semiconductor lasers. The performance of the proposed CS-based frequency mixer is investigated in all-optical and optoelectronic arrangements under different frequency mismatches and modulation strengths.
研究不足
The study is based on numerical simulations, and the practical implementation of the proposed schemes may face challenges such as maintaining the operational domain of CSs in the injection locked region for optimum performance and ensuring safe distances among multiple CSs for parallel operation.
1：Experimental Design and Method Selection:
The study employs numerical simulations to explore the nonlinear response of CSs in injected vertical-cavity-surface-emitting lasers (VCSELs) above laser threshold to modulated signals of different frequencies. The methodology involves the use of Maxwell–Bloch equations to describe the dynamics of the system.
2：Sample Selection and Data Sources:
The VCSEL-type laser considered is a GaAs/AlAs multiple quantum well structure serving as the active medium. Energy is provided by a broad-area and stationary injected beam and an electric current to create inversion.
3：List of Experimental Equipment and Materials:
The study does not specify physical equipment but relies on numerical simulations based on theoretical models.
4：Experimental Procedures and Operational Workflow:
The simulations involve modulating the external injection or pump current at specific frequencies to act as local oscillators and applying a localized address beam modulated at a different frequency as the signal oscillator. The response of the CSs to these modulations is analyzed.
5：Data Analysis Methods:
The power spectrum of the CS response is analyzed to identify the generation of mixed frequencies from those of the input oscillators.
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