研究目的
To improve the coupling efficiency between the laser diode and the waveguide grating in external cavity semiconductor lasers (ECSLs) to reduce the linewidth.
研究成果
The proposed methodology, including the addition of SSC and optimization of SOI waveguide structures, demonstrated a 51.6% improvement in coupling efficiency over conventional schemes. This approach provides a new way for future research on narrowing the linewidth of ECSLs.
研究不足
The study primarily focuses on the simulation and theoretical analysis of coupling efficiency improvements. Practical implementation and experimental validation of the proposed schemes are not covered, which could present limitations in real-world applications.
1：Experimental Design and Method Selection:
The coupling efficiency between the laser diode and the waveguide grating was improved by adding spot-size conversion (SSC) and using a silicon-on-insulator (SOI) waveguide. The coupling efficiencies C1 and C2 were calculated by MODE Solution, a simulation tool for planar waveguide devices.
2：Sample Selection and Data Sources:
The study focused on the relationship between coupling efficiency and SOI waveguide structures, with specific parameters for the waveguide structures being simulated.
3：List of Experimental Equipment and Materials:
The study utilized MODE Solution for simulations, focusing on the SSC model and SOI ridge waveguide structures.
4：Experimental Procedures and Operational Workflow:
The coupling efficiency was calculated under different waveguide structures with or without SSC. The total coupling efficiency C (C = C1 × C2) of the corresponding SOI waveguide structures was obtained.
5：Data Analysis Methods:
The overlap function was used to estimate the efficiency C1 and C2 between the two waveguides, with the coupling efficiency calculated based on the electromagnetic fields overlap.
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