Abstract
A 1-Tb/s single-channel coherent optical OFDM (CO-OFDM) signal consisting
of continuous 4104 spectrally-overlapped subcarriers is generated using a
recirculating frequency shifter (RFS). Theoretical and experimental analysis
of the RFS is performed to study its effectiveness in extending OFDM
bandwidth. In particular, the RFS produces a 320.6-GHz wide frequency comb
from a single laser with superior flatness and tone-to-noise ratio (TNR).
The 1-Tb/s CO-OFDM signal is consisted of 36 uncorrelated orthogonal bands
achieved by adjusting the delay of the RFS to an integer number of OFDM
symbol periods. The 1-Tb/s CO-OFDM signal with a spectral efficiency of 3.3
bit/s/Hz is successfully received after transmission over 600-km SSMF fiber
without either Raman amplification or dispersion compensation.
© 2010 IEEE
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