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Enhancing laser temperature stability by passive self-injection locking to a microring resonator.

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    We developed a thermally stable self-injection distributed feedback (DFB) laser lock to a microring resonator. This system significantly enhances temperature stability and allows for remote locking over long fiber distances.

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    Area of Science:

    • Photonics and Optical Engineering
    • Laser Physics
    • Integrated Optics

    Background:

    • Maintaining laser frequency stability is crucial for many applications.
    • Distributed feedback (DFB) lasers are widely used but can be sensitive to temperature fluctuations.
    • Microring resonators offer precise frequency selection but require stable laser sources.

    Purpose of the Study:

    • To demonstrate a thermally stable self-injection locking technique for a DFB laser using a microring resonator.
    • To improve the operational temperature range of the locked laser system.
    • To investigate the remote locking capabilities of the system over extended fiber lengths.

    Main Methods:

    • Implemented a self-injection locking scheme where a DFB laser is locked to the resonance of a microring resonator.
    • Incorporated optical amplification within the feedback loop to reduce the power required for locking.
    • Introduced a 2.2 km fiber spool to test remote locking performance.

    Main Results:

    • Achieved a tenfold increase in the operational temperature range for maintaining laser frequency within 100 MHz of the target.
    • Demonstrated reduced per-laser power requirements for locking due to the amplification in the feedback loop.
    • Successfully validated remote locking performance over a 2.2 km fiber link.

    Conclusions:

    • The self-injection locked DFB laser-microring resonator system offers enhanced thermal stability and reduced power consumption.
    • The system is suitable for remote laser frequency stabilization applications, even over significant distances.
    • This technique provides a robust solution for applications requiring highly stable laser frequencies.