Abstract
We experimentally demonstrate a direct-detection
orthogonal-frequency-division-multiplexing quadrature-phase-shift-keying (OFDM-QPSK)
system that is capable of delivering a 32 Gbaud OFDM-QPSK signal over 7 km single-mode
fiber-28 (SMF-28). Intra-symbol frequency-domain averaging (ISFA) channel response
estimation is applied to suppress in-band noise, while discrete Fourier transform-spread
(DFT-spread) is used to reduce the peak-to-average power ratio (PAPR) of the transmitted
OFDM signal. With the aid of ISFA-based channel estimation and PAPR reduction enabled by
DFT-spread, the bit-error ratio of the system after 7 km SMF-28 transmission can be
improved from 2×10−3 to error-free when the received optical power is
−8.5 dBm.
© 2016 Chinese Laser Press
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