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Related Concept Videos

Quantum Numbers02:43

Quantum Numbers

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Updated: Feb 11, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Ultra-narrow linewidth quantum dot coherent comb lasers with self-injection feedback locking.

Z G Lu, J R Liu, P J Poole

    Optics Express
    |May 3, 2018
    PubMed
    Summary

    External cavity self-injection feedback locking (SIFL) significantly narrows the optical linewidth of quantum dot (QD) coherent comb lasers (CCL). This advanced technique reduces phase noise and improves the radio frequency (RF) beating signal between laser channels.

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    Area of Science:

    • Quantum optics
    • Semiconductor lasers
    • Photonics

    Background:

    • Quantum dot (QD) lasers offer unique properties for optical applications.
    • Coherent comb lasers (CCL) are crucial for multi-wavelength applications.
    • Optical linewidth and phase noise are critical performance metrics for lasers.

    Purpose of the Study:

    • To investigate the effectiveness of external cavity self-injection feedback locking (SIFL) for linewidth reduction in QD CCLs.
    • To quantify the impact of SIFL on phase noise and RF signal quality.

    Main Methods:

    • Implementation of an external cavity self-injection feedback locking (SIFL) system.
    • Simultaneous linewidth reduction of over 39 wavelength channels in an InAs/InP QD CCL.
    • Measurement of optical linewidth, phase noise spectra, and RF beating signals.

    Main Results:

    • Optical linewidth reduced from MHz to sub-200 kHz for individual channels.
    • Significant decrease in phase noise observed above 2 kHz.
    • 3-dB linewidth of RF beating signals reduced from 10 kHz to 300 Hz, with baseline level dropping from -27 dB to -50 dB.

    Conclusions:

    • SIFL is a highly effective technique for simultaneously reducing the optical linewidth of multiple channels in QD CCLs.
    • The SIFL system substantially improves laser phase noise and RF signal quality.
    • This work demonstrates a significant advancement in QD laser performance for optical communication and sensing.