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Li F.,ZTE TXNJ | Li F.,Georgia Institute of Technology | Yu J.,ZTE TXNJ | Yu J.,Fudan University | And 8 more authors.
Optics Express | Year: 2016

In this paper, we successfully transmit 8 × 520 Gb/s preequalized DFT-spread PDM-16QAM orthogonal frequency-division multiplexing (OFDM) signal over 840 km SMF with BER under 2.4 × 10-2. We discuss how to obtain accurate tranceivers' response during preequalization for DFT-spread OFDM with coherent detection and we find conventional OFDM symbols training sequences (TSs) outperform DFTspread OFDM symbols TSs in obtaining channel response for preequalization and equalization. Additionally, the optimal IFFT/FFT size is explored for the pre-equalized DFT-spread PDM-16QAM-OFDM transmission systems. It is the first time to realize 400 Gb/s/λ net rate OFDM signal transmission. © 2016 Optical Society of America.

Li F.,ZTE TXNJ | Li F.,Georgia Institute of Technology | Zhang J.,ZTE TXNJ | Zhang J.,Fudan University | And 4 more authors.
Optical Fiber Technology | Year: 2015

In this paper, 16-Gbaud polarization-division-multiplexed (PDM) dual-subcarrier coherent optical orthogonal frequency division multiplexing (CO-OFDM) transmission and reception are successfully demonstrated without overhead. The in-phase and quadrature (I/Q) components of dual-subcarrier 16-ary quadrature amplitude modulation (QAM) OFDM signal are both seven-level signals in time domain, and thus can be equalized like a 49 QAM signal in time domain with cascaded multi-modulus algorithm (CMMA) equalization method. The experimental results show that there is no power penalty observed between optical back to back (OBTB) and after 80-km single-mode fiber-28 (SMF-28) with time domain CMMA equalization method. A 0.4 dB optical signal to noise ratio (OSNR) penalty in OBTB is observed when the bandwidth of channel is set at 26 GHz at the BER of 2.0 × 10-2. © 2015 Elsevier Inc.

Li F.,ZTE TXNJ | Li F.,Hunan University | Li F.,Georgia Institute of Technology | Yu J.,Fudan University | And 7 more authors.
Optical Fiber Communication Conference, OFC 2014 | Year: 2014

In this paper, 40GHz OFDM-RoF system with an I/Q modulator is demonstrated. The experimental results show that 18.8-Gb/s 64-QAM-OFDM signal carried by 38-GHz mm-wave after fiber-wireless link is robust to the synchronization timing errors with windowing technique.

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