Abstract
This paper describes ultrahigh capacity transmission based on
spectrally-efficient multi-level modulation and wideband optical
amplification techniques. 21.4-Gbaud polarization-division multiplexed (PDM)
16-ary quadrature amplitude modulation (QAM) signals are generated by
utilizing an optical synthesis technique, wavelength-multiplexed with 25-GHz
spacing by optical pre-filtering, and received by an intradyne coherent
receiver based on digital signal processing (DSP) with pilotless algorithms.
These techniques realize a spectral efficiency (SE) of 6.4 b/s/Hz.
Furthermore, a hybrid amplification technique that combines distributed
Raman and dual-band erbium-doped amplifiers (EDFAs) realizes 10.8-THz signal
bandwidth in C- and extended L-bands. By using these techniques, we
successfully demonstrate 69.1 Tb/s transmission over 240 km of low loss pure
silica core fibers.
© 2011 IEEE
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