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Low-SWaP, tunable, and narrow-linewidth laser systems for deployable quantum technologies.

Mateus Corato-Zanarella, Matthias Lommel, Dimitri Mayzlin

    Optics Express
    |March 18, 2026
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed a compact, low-power laser system using photonic integrated circuits (PICs) for quantum technologies. This tunable, narrow-linewidth laser meets stringent requirements for advanced optical applications.

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    Area of Science:

    • Quantum Optics and Photonics
    • Integrated Photonics
    • Laser Technology

    Background:

    • Advancing quantum optical technologies requires reducing the size, weight, and power (SWaP) of laser sources.
    • Photonic integrated circuit (PIC)-based lasers offer a promising alternative to bulky traditional lasers.
    • A system-level co-design of optics, electronics, and software is crucial for PIC-based laser systems but has not been fully realized.

    Purpose of the Study:

    • To demonstrate a low-SWaP, tunable, and narrow-linewidth laser system based on PICs and programmable control electronics.
    • To enable advanced functionalities for cutting-edge quantum and classical optical applications.
    • To provide a compact and fully integrated laser solution for scalable and deployable technologies.

    Main Methods:

    • Designed a PIC utilizing the Vernier effect between a Fabry-Pérot laser diode (FPLD) and a microring resonator (MRR) for self-injection locking.
    • Packaged the PIC-laser into a standard butterfly package and drove it with a custom digital laser controller.
    • Integrated optical isolators and fiber coupling into the complete laser system.

    Main Results:

    • Achieved a tunable laser system with kHz-level intrinsic linewidth and over 50 dB side-mode suppression ratio (SMSR).
    • Demonstrated up to 9.5 nm coarse tuning and 50 GHz mode-hop-free fine tuning.
    • Successfully performed spectroscopy on rubidium D2 transition lines and frequency-locked the laser for extended periods in a non-controlled environment.

    Conclusions:

    • The developed compact, low-SWaP, tunable, and narrow-linewidth PIC-based laser system meets critical requirements for quantum and classical optical applications.
    • The system's advanced functionalities and robust performance, demonstrated through rubidium spectroscopy, highlight its potential for real-world deployment.
    • This integrated laser system is envisioned as a key enabler for scalable and deployable quantum and classical optical technologies.