Abstract
We review the recent technology advancements related to the transmission
of 400Gb/s, wavelength-division-multiplexed channels for optical networks
based on the standard 50 GHz grid. We discuss the enabling
modulation, coding, and line system technologies, as well as the existing
challenges. Specifically, these technologies include time-domain hybrid 32-64
quadrature amplitude modulation, nearly ideal digital Nyquist pulse shaping,
improved channel bandwidth management methods such as end-to-end carrier frequency
control and distributed compensation of filtering effects arising from reconfigurable
optical add/drop multiplexers, distributed Raman amplification, and powerful
forward error correction. We demonstrate 400G transmission on the standard
50 GHz grid over meaningful transmission reach for regional and metropolitan
applications. However, further studies are needed to fully understand the
potential for meeting the requirements of long-haul transmission applications.
© 2012 IEEE
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