Direct-detection OFDM-QPSK system performance improvement enabled by DFT spread and receiver-based ISFA algorithm

作者：Su, Jie^*; Li, Xinying; Yu, Jianjun

来源：Chinese Optics Letters, 2016, 14(5): 050608.

DOI：10.3788/COL201614.050608

• OPTICAL OFDM
• TRANSMISSION
• LASER

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 x 10(-3) to error-free when the received optical power is -8.5 dBm.

• 出版日期2016-5-10
• 单位复旦大学