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    We developed a 16-wavelength high-power laser array for optical I/O. This laser array offers precise wavelength control and high output power, making it suitable for advanced optical systems.

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    Area of Science:

    • Photonics and Optical Engineering
    • Semiconductor Lasers
    • Integrated Optics

    Background:

    • Optical interconnects are crucial for high-speed data communication.
    • Developing compact, high-power, multi-wavelength laser sources is essential for optical input/output (I/O) technologies.
    • Distributed Feedback (DFB) lasers offer wavelength stability but require precise fabrication for multi-wavelength arrays.

    Purpose of the Study:

    • To propose and demonstrate a 16-wavelength high-power DFB laser array (HPLA) for optical I/O applications.
    • To achieve precise wavelength control and high output power using advanced fabrication and integrated components.
    • To validate the performance of the HPLA for use as a multi-wavelength source.

    Main Methods:

    • Fabrication of the HPLA grating using the reconstruction equivalent chirp (REC) technique for precise wavelength control.
    • Integration of Ti-Pt heaters as phase compensators for fine-tuning lasing wavelength and improving single-mode yield.
    • Utilization of slab-coupled optical waveguide (SCOW) to enhance output power and reduce divergence.
    • Coating of anti-reflection (AR) and high-reflection (HR) films on laser facets to boost output power.

    Main Results:

    • The 16-wavelength HPLA demonstrated precise wavelength control with deviations below 0.09 nm.
    • All lasers exhibited side-mode suppression ratios (SMSRs) exceeding 50 dB.
    • Kink-free output power surpassed 100 mW at 600 mA bias current.
    • Slope efficiencies (SE) were above 0.25 W/A and power conversion efficiencies (PCE) exceeded 12% at 100 mW.
    • Measured Lorentzian linewidth and far-field divergence were 273.5 kHz and 11.3°×21.5°, respectively.

    Conclusions:

    • The proposed HPLA with integrated phase compensators and SCOW effectively achieves precise wavelength control and high output power.
    • The demonstrated performance metrics, including high SMSR, output power, and efficiency, meet the requirements for optical I/O systems.
    • The HPLA is a viable and high-performance multi-wavelength source for next-generation optical interconnects.