Transmission of 100-Gb/s VSB DFT-Spread copyright Signal in Short-Reach Optical Communication Systems

Transmission of 100-Gb/s VSB DFT-Spread copyright Signal in Short-Reach Optical Communication Systems

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In this paper, we experimentally demonstrated transmission of a 100-Gb/s discrete Fourier transform Toothpaste (DFT)-spread 32-quadrature amplitude modulation (QAM) discrete multitone (copyright) signal in an intensity-modulation/direct-detection system utilizing a direct-modulated laser.We find that DFT-spread cannot only reduce the peak-to-average power ratio but also improve the robustness to high-frequency power attenuation and narrow-band interference in the high-speed Light Blub short-reach optical communication systems.Vestigial sideband (VSB) enabled by a narrow-bandwidth tunable optical filter can be adopted to resist the power fading effect induced by the fiber chromatic dispersion after direct detection.

The measured bit error ratio (BER) of 100-Gb/s VSB DFT-spread copyright signal after 20-km large effective area fiber is less than the hard-decision forward-error-correction (HD-FEC) limitation of3.8 ×10-3.