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Related Experiment Videos

Ultra-flat wideband single-pump Raman-enhanced parametric amplification.

V Gordienko, M F C Stephens, A E El-Taher

    Optics Express
    |April 7, 2017
    PubMed
    Summary

    Researchers optimized a fiber optical parametric amplifier for broader bandwidth and stable gain. They achieved ultra-flat amplification by merging Raman and parametric gain spectra, enhancing performance for optical communications.

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    Area of Science:

    • Optoelectronics
    • Nonlinear Optics
    • Fiber Optics

    Background:

    • Fiber optical parametric amplifiers (FOPAs) are crucial for optical communications, but optimizing their gain spectral bandwidth and gain variation (GV) remains challenging.
    • Achieving a flat and wide gain spectrum is essential for amplifying broadband signals without distortion.

    Purpose of the Study:

    • To experimentally optimize a single pump fiber optical parametric amplifier (FOPA) for maximum gain spectral bandwidth and minimal gain variation (GV).
    • To investigate the impact of pump wavelength, fiber length, and spectral merging on FOPA performance.

    Main Methods:

    • Experimental optimization of a single pump FOPA using dispersion-stable highly nonlinear fiber (HNLF).
    • Tuning the pump laser to the zero-dispersion wavelength of the HNLF.

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  • Varying the HNLF length and analyzing the combined Raman and parametric gain spectra.
  • Testing the amplifier with a 60 Gbit/s QPSK signal.

    • Main Results:

    • Optimal FOPA performance was achieved when the pump was tuned to the zero-dispersion wavelength of the HNLF.
    • Decreasing the HNLF length further improved parametric gain bandwidth and reduced GV.
    • Merging Raman and parametric gain spectra from the same pump significantly enhanced overall gain bandwidth while maintaining low GV.
    • An ultra-flat gain of 9.6 ± 0.5 dB over 111 nm (12.8 THz) was demonstrated.
    • Amplification of a 60 Gbit/s QPSK signal showed an Optical-to-Noise Ratio (OSNR) penalty of less than 1 dB for Q² below 14 dB.

    Conclusions:

    • Tuning the pump to the zero-dispersion wavelength and optimizing HNLF length are key to FOPA performance.
    • Merging Raman and parametric gain spectra offers a novel method for achieving ultra-wide and flat gain bandwidths.
    • The demonstrated FOPA exhibits excellent performance suitable for high-speed optical signal amplification.