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Optical single-sideband OFDM transmission based on a two-segment EAM.

Hsuan-Lin Cheng, Wei-Hung Chen, Chia-Chien Wei

    Optics Express
    |April 4, 2015
    PubMed
    Summary

    This study introduces a new optical single-sideband (SSB) Orthogonal Frequency Division Multiplexing (OFDM) modulation. It enables high-speed data transmission over long distances without needing dispersion compensation.

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    Area of Science:

    • Photonics and Optical Communications
    • Signal Processing

    Background:

    • Optical Orthogonal Frequency Division Multiplexing (OFDM) is susceptible to frequency-selective power fading in dispersive fiber transmission.
    • Traditional dispersion compensation methods add complexity and cost to optical systems.

    Purpose of the Study:

    • To propose and demonstrate a novel optical single-sideband (SSB) OFDM modulation scheme.
    • To mitigate frequency-selective power fading without requiring dispersion compensation.

    Main Methods:

    • Utilized a two-segment electro-absorption modulator (EAM) with differing chirp characteristics.
    • Designed specific driving signals to suppress one optical sideband, creating an SSB OFDM signal.
    • Implemented an Intensity Modulation/Direct Detection (IM/DD) system for experimental validation.

    Main Results:

    • Successfully demonstrated optical OFDM transmissions at 13.5-Gbps.
    • Achieved transmission over 0 to 200 km of standard single-mode fiber.
    • Confirmed the elimination of the need for dispersion compensation and distance-dependent bit/power loading.

    Conclusions:

    • The novel SSB OFDM scheme effectively suppresses optical sidebands, preventing power fading.
    • This approach offers a cost-effective and simpler solution for high-speed, long-haul optical communication systems.
    • The technique is suitable for Intensity Modulation/Direct Detection (IM/DD) systems, enhancing their reach and performance.