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Related Experiment Video

Updated: Apr 28, 2026

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

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Quantum dash based single section mode locked lasers for photonic integrated circuits.

Siddharth Joshi, Cosimo Calò, Nicolas Chimot

    Optics Express
    |June 13, 2014
    PubMed
    Summary

    We demonstrate a novel single-section frequency comb generator using InAs/InP Quantum Dash lasers integrated into photonic integrated circuits. This device enables on-chip, low phase noise frequency comb generation for advanced applications.

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    Area of Science:

    • Photonics
    • Quantum Optics
    • Semiconductor Lasers

    Background:

    • Frequency combs are crucial for precise measurements and optical communications.
    • Integrating lasers onto photonic integrated circuits (PICs) is a key goal for miniaturization and scalability.
    • Quantum Dash (QDash) lasers offer unique properties for mode-locking and comb generation.

    Purpose of the Study:

    • To demonstrate the first single-section InAs/InP Quantum Dash based frequency comb generator for PICs.
    • To investigate the impact of Bragg reflectors on mode-locking and frequency spacing.
    • To achieve monolithic integration of QDash lasers with Semiconductor Optical Amplifiers (SOAs) for low phase noise sources.

    Main Methods:

    • Fabrication of a single-section laser using InAs/InP Quantum Dash material.

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  • Integration of a specifically designed Bragg reflector to close the laser cavity.
  • Analysis of cavity mode dispersion and its effect on frequency equi-distance.
  • Monolithic integration of the Bragg mirror laser with a Semiconductor Optical Amplifier (SOA).

    • Main Results:

    • Successful demonstration of a single-section mode-locked laser for on-chip frequency comb generation.
    • Observation of dispersion-induced violation of equi-distance between adjacent mode frequencies due to the Bragg grating.
    • Achieved monolithic integration of QDash based low phase noise sources in PICs.

    Conclusions:

    • Single-section QDash lasers with Bragg reflectors can be integrated into PICs as on-chip frequency comb generators.
    • Bragg gratings introduce dispersion that prevents classical mode locking by violating equi-distance.
    • Monolithic integration with SOAs enables compact, low phase noise frequency comb sources on a chip.