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We experimentally demonstrate a direct-detection orthogonal-frequency-division-multiplexing quadraturephase-shift-keying(OFDM-QPSK) system that is capable of delivering a 32 Gbaud OFDM-QPSK signal over7 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 d Bm.
We experimentally demonstrate a direct-detection orthogonal-frequency-division-multiplexing quadraturephase-shift-keying (OFDM-QPSK) system that is capable of delivering a 32 Gbaud OFDM-QPSK signal over 7 km single-mode fiber-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 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 d Bm.