We experimentally demonstrate a photonics-based radio-over-fiber orthogonal-frequency-division-multiplexing (ROFOFDM) system located within the terahertz-wave (THz-wave) frequency range from 350GHz to 510GHz. In our demonstrated system, 4.46-GHz-bandwidth OFDM quadrature-phases-shift-keying (OFDM-QPSK) THz-wave signal within the frequency range from 350GHz to 510GHz, can be generated and delivered over 2.5-inch wireless transmission distance, with a bit-error ratio (BER) under the hard-decision forward-error-correction (HD-FEC) threshold of 3.8×10-3. In our demonstrated system, 4.46-GHz-bandwidth OFDM-QPSK THz-wave signal at 450GHz is delivered over up to 35-km fiber transmission distance and 2.5-inch wireless transmission distance, with a BER of 3.8×10-3.
The nonlinear compensation algorithm based on Volterra series has been proved effective in low order modulation OFDM system, such as QPSK/16QAM. In this paper, we demonstrate a 64QAM/ 128QAM DFT-S-OFDM signal generation with DML with some advanced algorithms such as DD-LMS, ISFA, DFT-S and nonlinear compensation to improve the signal performance. For the first time we demonstrate that the nonlinear compensation algorithm based on Volterra series can improve the performance of the high-order modulation DFT-S-OFDM signal such as 64QAM and 128QAM. In this experiment we have realized 19.1/11.2Gb/s 64/128QAM signal transmission over 15km fiber at 1307nm. For 64QAM case, the receiver sensitivity can be improved about 1dB when all the algorithms mentioned in this paper are adopted. And the BER can be improved from 4.7x10-3 to 2.8x10-3 at 7.0dBm for 128QAM signal, which reaches the HD-FEC threshold of 3.8x10-3.
KEYWORDS: Modulation, Signal generators, Single sideband modulation, Double sideband modulation, Radio optics, Single mode fibers, Digital signal processing, Laser sintering, Clocks, Receivers
We proposed single-sideband (SSB) quadrature phase-shift keying (QPSK) vector radio-frequency optical signal generation enabled by a single directly modulated laser without precoding technology, which can reduce the system cost and tolerate fiber dispersion. Based on our proposed scheme, we experimentally demonstrated 8-Gbaud SSB QPSK signals generation at 10 GHz, and the generated signals are transmitted over 50-km single-mode fiber without power penalty. Our experimental results show that an equal power SSB signal can tolerate fiber dispersion and have the highest receiver sensitivity.
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