TY - JOUR
T1 - Performance comparison of DFT-spread and pre-equalization for 8 × 244.2-Gb/s PDM-16QAM-OFDM
AU - Li, Fan
AU - Li, Xinying
AU - Yu, Jianjun
N1 - Publisher Copyright:
© 2014 IEEE.
PY - 2015/1/1
Y1 - 2015/1/1
N2 - In this paper, we experimentally compared the performance of discrete-Fourier-transform spread (DFT-spread) and pre-equalization in a 244.2-Gb/s polarization-division-multiplexed 16-ary quadrature amplitude-modulation orthogonal frequency-division multiplexing (PDM-16QAM-OFDM) transmission system. The pre-equalization is effective to overcome the high-frequency power attenuation in the channel. However, the acquisition of static channel response for pre-equalization is really complicated and the peak-to-average power ratio (PAPR) of the signal after pre-equalization even becomes a little higher. The DFT-spread can be applied to simultaneously resist high-frequency power attenuation and reduce the PAPR of OFDM signal. The experimental results also show that one band DFT-spread demonstrates the best narrow optical filtering tolerance. The transmission distance for 8 × 244.2-Gb/s wavelength-division-multiplexing (WDM) PDM-16QAM-OFDM at the soft-decision forward-error correction threshold of 2.4 × 10-2 is 2 × 420 km based on pre-equalization, while extended to over 3 × 420 km based on one band DFT-spread, which well illustrates one band DFT-spread is more efficient for high-bandwidth coherent WDM-OFDM system.
AB - In this paper, we experimentally compared the performance of discrete-Fourier-transform spread (DFT-spread) and pre-equalization in a 244.2-Gb/s polarization-division-multiplexed 16-ary quadrature amplitude-modulation orthogonal frequency-division multiplexing (PDM-16QAM-OFDM) transmission system. The pre-equalization is effective to overcome the high-frequency power attenuation in the channel. However, the acquisition of static channel response for pre-equalization is really complicated and the peak-to-average power ratio (PAPR) of the signal after pre-equalization even becomes a little higher. The DFT-spread can be applied to simultaneously resist high-frequency power attenuation and reduce the PAPR of OFDM signal. The experimental results also show that one band DFT-spread demonstrates the best narrow optical filtering tolerance. The transmission distance for 8 × 244.2-Gb/s wavelength-division-multiplexing (WDM) PDM-16QAM-OFDM at the soft-decision forward-error correction threshold of 2.4 × 10-2 is 2 × 420 km based on pre-equalization, while extended to over 3 × 420 km based on one band DFT-spread, which well illustrates one band DFT-spread is more efficient for high-bandwidth coherent WDM-OFDM system.
KW - Orthogonal frequency division multiplexing (OFDM)
KW - discrete-Fouriertransform spread (DFT-spread)
KW - narrow optical filtering tolerance
KW - pre-equalization
UR - http://www.scopus.com/inward/record.url?scp=84921888337&partnerID=8YFLogxK
U2 - 10.1109/JLT.2014.2375794
DO - 10.1109/JLT.2014.2375794
M3 - Article
AN - SCOPUS:84921888337
SN - 0733-8724
VL - 33
SP - 227
EP - 233
JO - Journal of Lightwave Technology
JF - Journal of Lightwave Technology
IS - 1
M1 - 6980462
ER -