Abstract
The Nyquist wavelength-division multiplexing technique enable a solution
to achieve high spectral efficiency in long-haul transmission system. Compare
to polarization division multiplexing quadrature-phase-shift-keying, even
high-level modulation scheme such as polarization division multiplexing 16-quadrature-amplitude-modulation
is much more sensitive to intra-channel noise and inter-channel linear crosstalk
caused by Nyquist wavelength-division multiplexing. We experimentally demonstrated
the generation and transmission of the 6 × 128-Gb/s Nyquist wavelength-division
multiplexing sixteen quadrature amplitude modulation signal over 1200-km single-mode
fiber (SMF)-28 with Erbium-doped fiber amplifier only amplification with a
net SE of 7.47 b/s/Hz, which is so far, to our knowledge, the highest SE for
the signal with the bit rate above 100-Gb/s using the polarization-division
multiplexing 16-quadrature-amplitude-modulation format. This experiment was
successfully enabled by digital-signal-processing (DSP) pre-equalization of
transmitter-side impairments and DSP post-equalization of the channel and
receiver-side impairments. Nyquist-band is considered in the pre- equalization
to enhance the tolerance of the polarization-division multiplexing 16-quadrature-amplitude-modulation
to the aggressive spectral shaping. The bit error rate for each of the 6 channels
is smaller than the limitation of the forward-error-correction limit of 3.8 × 10<sup>-3</sup> after
1200-km SMF-28 transmission.
© 2012 IEEE
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