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Electronic Distance Measuring Instruments01:30

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Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...

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Efficient and accurate parameter extraction for quantum-well DFB lasers: a comprehensive approach integrating

Changpeng Li, Feng Gao, Jiewen Chi

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    This study presents an efficient method for extracting parameters of quantum well distributed feedback (DFB) lasers. The approach combines multiple models for accurate results, validated by experimental data.

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    Area of Science:

    • Optoelectronics
    • Semiconductor Devices
    • Laser Physics

    Background:

    • Accurate parameter extraction is crucial for optimizing quantum well distributed feedback (DFB) laser performance.
    • Existing methods may face challenges with accuracy and efficiency in complex laser structures.

    Purpose of the Study:

    • To develop an efficient and accurate method for parameter extraction in quantum well DFB lasers.
    • To validate the proposed method through simulation and experimental comparison.

    Main Methods:

    • Integration of rate equation model, finite element method, transmission matrix method, and traveling wave model (TWM).
    • Fabrication and measurement of companion Fabry-Perot (FP) lasers for parameter extraction.
    • Utilizing TWM for simulating DFB laser output characteristics.

    Main Results:

    • Efficient extraction of common material and structural parameters using FP lasers.
    • Accurate extraction of intrinsic DFB laser parameters, avoiding multiple solutions.
    • Simulation results using TWM closely match experimental data.

    Conclusions:

    • The proposed integrated modeling approach is feasible and accurate for DFB laser parameter extraction.
    • The method provides a reliable way to predict DFB laser output characteristics.
    • This work contributes to the advancement of DFB laser design and optimization.