Abstract
We propose nonlinear tolerant single carrier frequency-division-multiplexing
(SC-FDM) signal enhanced by digital pilot-tone for future high speed Ethernet
transport like 400 G Ethernet. First, we discuss system configuration and
the wavelength-division-multiplexed (WDM) transmission of SC-FDM signals employing
polarization-division-multiplexed (PDM) 64-ary quadrature amplitude modulation
(64-QAM). Next, we describe the long-haul transmission characteristics of
50 GHz-spaced 538 Gb/s × 7 ch WDM signals. We compare digital back-propagation
(DBP) and digital pilot-tone for nonlinearity compensation and experimentally
show that digital pilot-tone can effectively compensate the phase noise induced
by inter-channel nonlinear effects with less computational complexity than
DBP. Then we discuss a high-capacity transmission experiment employing 548
Gb/s PDM-64QAM SC-FDM; 102.3 Tb/s (224 × 548 Gb/s) C- and extended L-band WDM transmission
is demonstrated over 240 km (3 × 80 km) of pure-silica-core fiber (PSCF) with all-Raman
amplification. Thanks to the high nonlinear tolerance enhanced by pilot-tone,
we can employ the 80 km repeater spacing used in conventional terrestrial
systems. Assuming 20% forward error correction (FEC) overhead, a spectral
efficiency of 9.1 b/s/Hz is achieved.
© 2012 IEEE
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