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Transmission performance improvement using random DFB laser based Raman amplification and bidirectional second-order

M Tan, P Rosa, S T Le

    Optics Express
    |February 25, 2016
    PubMed
    Summary

    A novel distributed Raman amplification scheme using random distributed feedback fiber lasers enables longer reach for high-speed optical transmissions. This method improves signal quality and transmission distance without increasing noise.

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    Area of Science:

    • Optical Communications
    • Fiber Laser Technology
    • Signal Amplification

    Background:

    • Conventional Raman amplification schemes face limitations in extending transmission reach.
    • Relative intensity noise (RIN) can degrade signal quality in high-speed optical transmissions.
    • Bidirectional pumping is crucial for long-haul optical networks.

    Purpose of the Study:

    • To demonstrate a distributed Raman amplification scheme for enhanced long-haul optical transmission.
    • To investigate the impact of random distributed feedback (DFB) fiber laser on bidirectional Raman pumping.
    • To assess the compatibility of the proposed scheme with nonlinearity compensation techniques.

    Main Methods:

    • Implementation of a distributed Raman amplification scheme utilizing a random distributed feedback (DFB) fiber laser.

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  • Employing bidirectional second-order Raman pumping.
  • Testing 10 × 116 Gb/s dual-polarization quadrature phase-shift keying (DP-QPSK) wavelength-division multiplexing (WDM) transmission.

    • Main Results:

    • Achieved an extended transmission reach of up to 7915 km for 10 × 116 Gb/s DP-QPSK WDM signals.
    • Demonstrated bidirectional second-order Raman pumping without increasing signal relative intensity noise (RIN).
    • Maintained uniform and symmetric signal power distribution, outperforming conventional schemes.

    Conclusions:

    • The proposed DFB fiber laser-based Raman amplification scheme significantly extends optical transmission reach.
    • This method offers superior performance compared to existing Raman amplification techniques.
    • The scheme's compatibility with nonlinearity compensation (e.g., OPC, NFT) enhances its applicability for future optical networks.