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    Area of Science:

    • Optoelectronics
    • Laser Physics
    • Optical Communications

    Background:

    • Optical injection locking (OIL) is a technique for synchronizing lasers.
    • Achieving stable OIL at low power is challenging but essential for energy-efficient optical systems.
    • Phase noise is a critical parameter affecting the performance of optical communication systems.

    Purpose of the Study:

    • To demonstrate record low injection power for OIL using EDFA pre-amplification and a phase locked loop (PLL).
    • To investigate the influence of injection power on phase noise characteristics in OIL.
    • To evaluate the performance of OIL in a phase sensitive amplifier (PSA) receiver for free-space communications.

    Main Methods:

    • Demonstration of optical injection locking (OIL) at -65 dBm injection power.
    • Utilizing an Erbium-Doped Fiber Amplifier (EDFA) for pre-amplification.
    • Employing an electrical phase locked loop (PLL) for laser synchronization.
    • Characterization of phase noise and slave laser linewidth under varying injection powers.
    • Evaluation of an OIL-based pump recovery in a phase sensitive amplifier (PSA) receiver.

    Main Results:

    • Record low injection power of -65 dBm achieved for OIL.
    • Identified slave laser linewidth and injection ratio as key factors influencing phase noise at low injection powers.
    • EDFA pre-amplification reduced minimum locking power and enabled an optimum injection power for minimized phase noise.
    • Achieved phase noise lower than that without EDFA pre-amplification.
    • Successful evaluation of OIL-based pump recovery in a PSA receiver system.

    Conclusions:

    • EDFA pre-amplification significantly enhances OIL performance by reducing locking power and optimizing phase noise.
    • The developed OIL technique with EDFA and PLL is promising for low-power, high-performance optical communication systems.
    • OIL-based pump recovery is a viable strategy for PSA receiver systems in free-space communications.