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    Characterization of a Red Multimode Vertical-Cavity Surface-Emitting Laser for Intrinsic Parameters

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    Name:
    JULY 4 Master's Thesis Jonathan Wagstaff Final.pdf
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    10.12Mb
    Format:
    PDF
    Description:
    Final Thesis
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    Type
    Thesis
    Authors
    Wagstaff, Jonathan cc
    Advisors
    Ooi, Boon S. cc
    Committee members
    Salama, Khaled N. cc
    Schwingenschlögl, Udo cc
    Ng, Tien Khee cc
    Program
    Electrical and Computer Engineering
    KAUST Department
    Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division
    Date
    2021-07
    Permanent link to this record
    http://hdl.handle.net/10754/669964
    
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    Abstract
    Compared to single-mode VCSELs, multimode VCSELs have not received much attention in models and characterizations for functional parameters, despite making up the majority of commercially available VCSELs [1]. In particular, the extraction of the linewidth enhancement factor for multimode VCSELs has been overlooked, likely due to difficulties in measurement. Additionally, multimode models for VCSELs have, until recently, omitted spectral characteristics such as linewidth [2]. This is the first work to report a measured linewidth enhancement factor value (lower bound) for a multimode VCSEL. A characterization for the functional parameters of a red multimode vertical-cavity surface-emitting laser (VCSEL) is shown herein. The extracted values form a complete working set of parameters for the laser rate equations. The techniques employed for extracting values include frequency responses, power versus current fittings, and optical spectral measurements. From the frequency responses at various bias currents, the relaxation oscillation frequency and damping factor are found. The power versus current curve is fitted to find parameters including the modal spontaneous emission rate and carrier density at threshold. The spectral measurements are used for evaluating the linewidth enhancement factor (LEF) also known as the alpha factor or Henry factor. These 5 methods have been applied previously to characterizing single-mode VCSELs [3]–[5]. The experimentally extracted parameters herein are important for creating accurate models and simulations for multimode VCSELs. Improved multimode VCSEL models are necessary for improving optical communication, especially for short-range optical interconnects [2]. The measured parameters for the characterized VCSEL are comparable to similar single-mode VCSELs characterized in other works. This is promising because multi-mode VCSELs have higher output power than their single-mode counterparts, thus these results may aid in improving short-range optical interconnects.
    Citation
    Wagstaff, J. M. (2021). Characterization of a Red Multimode Vertical-Cavity Surface-Emitting Laser for Intrinsic Parameters. KAUST Research Repository. https://doi.org/10.25781/KAUST-8P5BP
    DOI
    10.25781/KAUST-8P5BP
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-8P5BP
    Scopus Count
    Collections
    MS Theses; Electrical and Computer Engineering Program; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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