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    Area of Science:

    • Photonics and Laser Technology
    • Integrated Optics
    • Semiconductor Lasers

    Background:

    • Distributed feedback (DFB) lasers are crucial for optical communications.
    • Achieving narrow linewidths and single longitudinal mode operation in DFB laser arrays is challenging.
    • Existing methods for linewidth reduction in laser arrays are often complex or inefficient.

    Purpose of the Study:

    • To propose and demonstrate a novel structure for simultaneous linewidth compression in DFB laser arrays.
    • To ensure single longitudinal mode operation through controlled optical feedback.
    • To enhance the performance and applicability of integrated laser arrays.

    Main Methods:

    • A unique feedback structure utilizing interference between a primary cavity and a dual-cavity feedback is proposed.
    • The structure is designed to enhance feedback effects for each wavelength in the laser array.
    • Experimental validation of the proposed structure's effectiveness in linewidth reduction.

    Main Results:

    • The proposed structure successfully achieves intense linewidth compression for DFB laser arrays.
    • Side-mode suppression ratios exceeding 40 dB were recorded for each DFB laser.
    • Laser linewidths were compressed from 3 MHz down to approximately 800 Hz.

    Conclusions:

    • The developed structure provides an effective method for simultaneous linewidth compression in DFB laser arrays.
    • The approach ensures stable single longitudinal mode operation, crucial for high-performance photonic systems.
    • This linewidth compression scheme is suitable for adoption in various integrated laser array applications.