Abstract
We discuss the generation and transmission of 450 Gb/s wavelength-division
multiplexed (WDM) channels over the standard 50 GHz ITU-T grid optical
network at a net spectral efficiency of 8.4 b/s/Hz. This result is
accomplished by the use of Nyquist-shaped, polarization-division-multiplexed
(PDM) 32-quadrature amplitude modulation (QAM) and both pre- and
post-transmission digital equalization. To overcome the limitation of
available digital-to-analog converter bandwidth, a novel method is
introduced for the generation of the five-subcarriers of the 450 Gb/s
signal. Nearly ideal Nyquist pulse-shaping (roll-off factor = 0.01)
enables guard bands of only 200 MHz between subcarriers. To mitigate the
narrow optical filtering effects from the 50 GHz-grid reconfigurable optical
add-drop multiplexer (ROADM), a broadband optical pulse-shaping method has
been proposed and demonstrated. By combined use of electrical and optical
shaping techniques, transmission of 5 × 450 Gb/s PDM-Nyquist 32
QAM on the 50 GHz grid over 800 km and one 50 GHz-grid ROADM has been
successfully demonstrated.
© 2011 IEEE
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