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1.55-μm distributed feedback laser monolithically integrated with amplifier array.

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    This study introduces a novel 1.55-μm distributed feedback laser integrated with optical amplifiers. It achieves high output power and a narrow beam divergence using cost-effective fabrication methods.

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    Area of Science:

    • Optoelectronics
    • Semiconductor Lasers
    • Integrated Photonics

    Background:

    • Distributed feedback (DFB) lasers are crucial for optical communication.
    • Existing fabrication methods can be complex and costly.
    • Integration of multiple optical functions on a single chip is a key goal.

    Purpose of the Study:

    • To develop a monolithically integrated 1.55-μm DFB laser with semiconductor optical amplifiers (SOAs).
    • To achieve high output power and a desirable beam pattern using low-bias currents.
    • To present a cost-effective and flexible fabrication approach.

    Main Methods:

    • Monolithic integration of a 1.55-μm DFB laser with multistage multimode interferences and SOAs.
    • Utilizing side-wall gratings and quantum-well intermixing for fabrication.
    • Operation with low-bias currents.

    Main Results:

    • Achieved an output power of approximately 100 mW.
    • Demonstrated a quasi-single spatial-mode far-field pattern.
    • Obtained a low divergence angle of 3.5° in the horizontal direction.

    Conclusions:

    • The developed integrated laser offers a high-performance, cost-effective solution.
    • The fabrication techniques provide a simple and flexible alternative to conventional methods.
    • This technology has potential for advanced optical communication systems.