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Journals and Conferences
We demonstrate the feasibility of transmitting 5×32 Gbaud DP-16QAM faster-than-Nyquist signals within 30 GHz spaced channels, which is enabled by the Tomlinson-Harashima precoding (THP) combined with soft-decision forward error correction (SD-FEC).
We present and numerically demonstrate a polarization-division multiplexing 16-ary quadrature amplitude modulation faster-than-Nyquist (FTN-PDM-16QAM) system enabled by the Tomlinson-Harashima precoding (THP). The THP module is located before the polarization separation module and it is shown that the modulo operator of the THP module at the receiver needs… (More)
Long-haul optical transmission systems employing coherent optical orthogonal frequency division multiplexing (CO-OFDM) are sensitive to laser phase noise. This causes a common phase rotation and inter-carrier interference. An effective method to compensate for the phase noise is to insert an RF-pilot tone in the middle of the OFDM signal. This RF-pilot is… (More)
A simple 60-GHz radio-over-fiber system employing a combination of uncorrelated optical heterodyning and envelope detection is proposed and experimentally demonstrated. At the central office, a multiband orthogonal frequency division multiplexing ultrawideband (MB-OFDM UWB) signal is used for the external modulation of a dual-arm Mach-Zehnder Modulator to… (More)
A simple single-mode fiber/multimode fiber (SMF-MMF) 60-GHz radio over fiber scheme using a conventional central launching technique at 1550 nm is proposed and experimentally evaluated. The system targets cost-efficient Gigabit wireless access using already installed indoor MMF fed by a passive optical network topology. A complete characterization of the… (More)
We present an experimental analysis of the performance of Multiband-Orthogonal Frequency Division Multiplexing (MB-OFDM) Ultra-Wideband (UWB) in the 60-GHz radio band distributed using Radio-Over-Fiber (RoF) techniques. To reduce cost, direct modulation of a commercially-available distributed feedback (DFB) laser is used with optical up-conversion achieved… (More)
A training-based channel estimation algorithm is proposed for the faster-than-Nyquist polarization division multiplexed m-ary quadrature amplitude modulation (m = 4, 16, 64) systems with Tomlinson-Harashima precoding (THP). This is robust to the convergence failure phenomenon suffered by the existing algorithm, yet remaining format-transparent. Simulation… (More)
In this paper, we present experimental demonstrations of the effects on the system performance of a direct-detection optical Orthogonal Frequency Division Multiplexing (DD-OOFDM) system due to variation of the bias voltage to the Mach-Zehnder modulator (MZM). This work also investigates how a variation in the modulation format influences the non-linear… (More)
Digital predistortion for an intensity-modulated direct-detection MB-OFDM UWB system is proposed and experimentally demonstrated to compensate for the non-linear transfer characteristics of the utilized Mach-Zehnder modulator and improve system performance.
A joint frame and carrier frequency synchronization algorithm for coherent optical systems, based on the digital computation of the fractional Fourier transform (FRFT), is proposed. The algorithm utilizes the characteristics of energy centralization of chirp signals in the FRFT domain, together with the time and phase shift properties of the FRFT. Chirp… (More)