Decision-aided sampling frequency offset compensation for reduced-guard-interval coherent optical OFDM systems.
We propose a decision-aided algorithm to compensate the sampling frequency offset (SFO) between the transmitter and receiver for reduced-guard-interval (RGI) coherent optical (CO) OFDM systems. In this paper, we first derive the cyclic prefix (CP) requirement for preventing OFDM symbols from SFO induced inter-symbol interference (ISI). Then we propose a new decision-aided SFO compensation (DA-SFOC) algorithm, which shows a high SFO tolerance and reduces the CP requirement. The performance of DA-SFOC is numerically investigated for various situations. Finally, the proposed algorithm is verified in a single channel 28 Gbaud polarization division multiplexing (PDM) RGI CO-OFDM experiment with QPSK, 8 QAM and 16 QAM modulation formats, respectively. Both numerical and experimental results show that the proposed DA-SFOC method is highly robust against the standard SFO in optical fiber transmission.
Wei
W
Wang
Qunbi
Q
Zhuge
Mohamed
M
Morsy-Osman
Yuliang
Y
Gao
Xian
X
Xu
Mathieu
M
Chagnon
Meng
M
Qiu
Minh Thang
MT
Hoang
Fangyuan
F
Zhang
Rui
R
Li
David V
DV
Plant