Abstract
A new method incorporating biased clipping orthogonal frequency division
multiplexing (OFDM) is presented, which mitigates fiber nonlinear effects in a
long-haul coherent optical OFDM (CO-OFDM) system. Under the scheme of the method,
the wanted signal carried by odd subcarriers is orthogonal to clipping noise and a
Mach-Zehnder modulator (MZM) performs the optimal OFDM signal up-converter from the
radio frequency (RF) domain to the optical domain. Analysis and simulation results
show that fiber non-linear effects can be effectively mitigated by reducing the
peak-to-average power ratio (PAPR) in biased clipping CO-OFDM system. The
nonlinearity threshold (NLT) is improved by 5 dB with a reach of 240 km. With a
fiber length up to 800 km, system Q value is improved by approximately 2.3, 1.2, and
0.6 dB at a chromatic dispersion of 6, 12, and 16 ps/(nm·km), respectively.
Additionally, system Q reaches the maximum when direct currect (DC) bias is equal to
the mean value of the OFDM waveform.
© 2012 Chinese Optics Letters
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