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Related Experiment Video

Updated: Aug 17, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

9.1K

InP integrated optical frequency comb generator using an amplified recirculating loop.

Euan J Tough, Martyn J Fice, Guillermo Carpintero

    Optics Express
    |December 16, 2022
    PubMed
    Summary
    This summary is machine-generated.

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    Researchers developed a compact indium phosphide (InP) photonic chip for generating optical frequency combs. This integrated device uses an amplified recirculating loop to create phase-coherent comb lines efficiently.

    Area of Science:

    • Photonics and Optical Engineering
    • Integrated Optics
    • Semiconductor Devices

    Background:

    • Optical frequency combs are crucial for precise measurements and spectroscopy.
    • Existing methods often require bulky external components and high power consumption.
    • Indium phosphide (InP) offers advantages for integrated photonics, including optical gain.

    Purpose of the Study:

    • To demonstrate a novel, compact photonic chip for generating optical frequency combs.
    • To leverage the amplified recirculating loop technique on an InP foundry platform.
    • To achieve phase-coherent, evenly spaced comb lines with integrated amplification.

    Main Methods:

    • Utilized an amplified recirculating loop architecture with cascaded electro-optic modulators on InP.

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    Last Updated: Aug 17, 2025

    Generation and Coherent Control of Pulsed Quantum Frequency Combs
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    Generation and Coherent Control of Pulsed Quantum Frequency Combs

    Published on: June 8, 2018

    9.1K
    Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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  • Injected a continuous wave laser and drove modulators at the loop's round-trip frequency.
  • Integrated semiconductor optical amplifiers to compensate for loop losses and broaden bandwidth.

    • Main Results:

    • Generated 59 phase-coherent comb lines within a 20 dB power envelope at 6.71 GHz.
    • Achieved a second device generating 57 comb lines at ~10 GHz.
    • Demonstrated tunability of the free spectral range by 150 MHz using integrated phase shifters.

    Conclusions:

    • The InP-based photonic chip offers a compact and power-efficient solution for optical frequency comb generation.
    • Integrated amplification significantly improves performance and reduces system complexity.
    • The demonstrated technology is suitable for various applications requiring stable, broadband optical frequency combs.