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We investigated the optimized signal condition of the combined 8-QAM and QPSK subcarrier modulation for optical OFDM. The performance improvement was confirmed by WDM transmission experiments with the optimized power difference and subcarrier number.
We demonstrate a simple beat interference cancellation approach enabling higher spectral efficiency and better sensitivity (> 2 dB) for DDO-OFDM. The associated benefits of enhanced phase noise and PMD tolerances, as well as the impacts of diverse filter parameters, are also discussed.
We demonstrate the first digital laser-phase-noise (PN) mitigation approach for DDO-OFDM which applies a simple Wiener filter for adaptively estimating the statistical-unknown PN. The PN tolerance, in terms of the achievable fibre length, is about tripled with this PN mitigation technique.
A hybrid compensation method for transmitter and receiver IQ imbalance in high capacity OFDM is investigated. Effectiveness is confirmed by simulation and a 16 QAM 27.3-Gbit/s transmission experiment. After 320 km SSMF, 3.5 dB OSNR improvement is achieved.
We discuss coherent optical orthogonal frequency division multiplexing (CO-OFDM) as a suitable modulation technique for long-haul transmission systems. Several design and implementation aspects of a CO-OFDM system are reviewed, but we especially focus on phase noise compensation. As conventional CO-OFDM transmission systems are very sensitive to laser phase noise a novel method to compensate for phase...
We optimised the back-propagating noise suppression light (BPNSL) which improves the noise figure and power conversion efficiency of the L-band EDFA. The 1555 nm BPNSL was found to be most effective
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