We show the application of closed-form expressions for nonlinear transmission performance of coherent optical OFDM
systems with frequency guard band. The dependences of their performances on system parameters are investigated and
new findings on the influence of dispersion compensation configuration and guard band are observed. The advantage of
using closed-form expressions is that the performance for various system configurations can be identified without
resorting to sophisticated numerical simulations.
We demonstrate transmission of 1.0-Tb/s unique-word DFT-spread OFDM signal over 8000-km SSMF with 80-km span
length and EDFA-only amplification, representing a record spectral efficiency and reach product compatible with most
of the deployed links.
We provide a closed-form expression for differential phase error variance in coherent systems. Based on
the closed-form expression, a novel method of laser linewidth characterization and monitoring is
verified by both simulation and experiments.
In this paper, we first provide analysis and discussion on the optimal symbol rate for long-haul
transmission. In particular, the optimal subband bandwidth in a multi-band DFT-Spread OFDM
(MB-DFT-S OFDM) system is studied. We then carry out numerical simulation of 107 Gb/s MB-DFT-S
OFDM systems and find the optimal subband bandwidth is 3.5 GHz for dispersion un-compensated
systems. We finally show experimental demonstration of the nonlinearity improvement of
DFT-S-OFDM over conventional OFDM systems.
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