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Wavelength-tunable single longitudinal mode fiber optical parametric oscillator.

L T Lim, M H Abu Bakar, M A Mahdi

    Optics Express
    |April 7, 2017
    PubMed
    Summary

    Researchers developed a single longitudinal mode fiber optical parametric oscillator. This laser uses a novel sub-ring cavity and unpumped erbium-doped fiber for stable, narrowband operation, achieving a 17.35 kHz linewidth.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Fiber Optics

    Background:

    • Fiber optical parametric oscillators (FOPOs) are crucial for generating tunable laser light.
    • Achieving stable, single longitudinal mode (SLM) operation in FOPOs remains a challenge.
    • Existing methods for SLM selection can be complex or introduce excess loss.

    Purpose of the Study:

    • To demonstrate a novel ring cavity fiber optical parametric oscillator (FOPO) capable of stable single longitudinal mode (SLM) operation.
    • To utilize the unique properties of an unpumped erbium-doped fiber for effective mode selection.
    • To characterize the performance of the developed SLM FOPO in terms of linewidth, tuning range, and stability.

    Main Methods:

    • A ring cavity FOPO was constructed incorporating a passive sub-ring cavity.

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  • An unpumped erbium-doped fiber (EDF) was integrated with an external fiber mirror for single mode selection.
  • The EDF's saturable absorption characteristic was exploited to create a self-induced narrowband filter via counter-propagating wave interference.
  • Laser performance was measured at a pump power of 31.2 dBm.

    • Main Results:

    • Stable single longitudinal mode (SLM) operation was achieved with a narrow linewidth of 17.35 kHz.
    • A tunable wavelength range of 3.8 nm (from 1536.5 nm to 1540.3 nm) was demonstrated.
    • A high signal-to-noise ratio (SNR) of approximately 60 dB was maintained across the tuning range.
    • The power stability of the SLM laser was measured to be 2.07 dB over a 30-minute period.

    Conclusions:

    • The proposed configuration effectively generates a stable single longitudinal mode fiber optical parametric oscillator.
    • The use of an unpumped EDF as a self-induced filter provides a simple and efficient method for SLM selection in FOPOs.
    • The demonstrated performance metrics indicate the potential of this SLM FOPO for various applications requiring narrow linewidth and tunable laser sources.