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Low-noise phase-sensitive optical parametric amplifier with lossless local pump generation using a digital dither

Rasmus Larsson, Kovendhan Vijayan, Jochen Schröder

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    |November 29, 2023
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    Summary

    Researchers developed a novel, lossless method for phase-sensitive amplifiers (PSAs) to achieve phase-locking without a pump pilot. This technique enables low noise figures essential for advanced optical systems.

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    Area of Science:

    • Optoelectronics
    • Optical Communications
    • Signal Processing

    Background:

    • Phase-sensitive amplifiers (PSAs) offer low noise figures crucial for optical systems.
    • A key challenge is achieving phase-locking among signal, idler, and pump waves.
    • Existing methods like injection locking or lossy carrier regeneration have practical limitations.

    Purpose of the Study:

    • To introduce a novel, lossless approach for phase-locking in PSAs.
    • To eliminate the need for a pump pilot in PSA systems.
    • To experimentally validate the new phase-locking technique and assess its performance.

    Main Methods:

    • Implementation of a digital dither-based optical phase-locked loop (OPLL) within the PSA.
    • Generation of a phase-locked receiver-local pump wave.
    • Experimental demonstration and noise figure measurement.

    Main Results:

    • Achieved a low noise figure of 2 dB.
    • Observed a minimal 0.3 dB penalty due to imperfect phase-locking.
    • Compared phase-locking performance in PSAs versus 50/50 couplers.

    Conclusions:

    • The digital dither-based OPLL offers a viable, lossless solution for PSA phase-locking.
    • The method significantly reduces implementation complexity compared to prior techniques.
    • Further improvements are possible by optimizing loop delay and laser phase characteristics.