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    This study introduces asymmetric structures for multiwavelength distributed feedback (DFB) semiconductor laser arrays (MLA), reducing fabrication costs and improving wavelength precision for photonic integration.

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    Area of Science:

    • Optoelectronics
    • Semiconductor Lasers
    • Photonic Integration

    Background:

    • Multiwavelength semiconductor laser arrays are crucial for advanced optical systems.
    • Existing fabrication methods for distributed feedback (DFB) laser arrays can be costly and limit wavelength precision.
    • Asymmetric structures offer potential for improved performance and manufacturability.

    Purpose of the Study:

    • To investigate the design and fabrication of multiwavelength DFB semiconductor laser arrays (MLA) using asymmetric structures.
    • To demonstrate the feasibility of achieving asymmetric phase shifts and coupling coefficients via a common holographic exposure technique.
    • To evaluate the performance improvements, including slope efficiency and wavelength precision, compared to conventional DFB lasers.

    Main Methods:

    • Utilizing a sampling technique with common holographic exposure to create asymmetric structures in DFB laser arrays.
    • Designing and fabricating a 10-wavelength asymmetrically phase-shifted MLA.
    • Characterizing the fabricated MLA for slope efficiency, single longitudinal mode operation, and wavelength precision.

    Main Results:

    • Successfully fabricated an asymmetrically phase-shifted MLA with 10 wavelengths.
    • Achieved significantly improved slope efficiency compared to common phase-shifted DFB lasers.
    • Maintained single longitudinal mode operation and obtained high wavelength precision.

    Conclusions:

    • Asymmetric structures in multiwavelength DFB semiconductor laser arrays can be fabricated cost-effectively using holographic exposure.
    • The proposed asymmetric MLA designs offer enhanced performance, including improved slope efficiency and wavelength precision.
    • These advancements hold significant potential for future multiwavelength emitters in photonic integration applications.