Abstract
We propose a modular scalable long-haul architecture supporting variable-bandwidth
channels with bit rates from 100 Gbit/s to beyond 1 Tbit/s. Colorless transceivers
have two operating modes. One transceiver can transmit/receive a conventional
narrow-band channel occupying a 30-GHz bandwidth and conveying 100 Gbit/s,
or a set of <i>M</i> transceivers can cooperate to transmit/receive a wideband channel
occupying an <i>M</i> ×
50-GHz bandwidth and conveying roughly 160 Gbit/s per 50
GHz (assuming polarization-multiplexed quaternary phase-shift keying). A colorless
wavelength-selective switch supports two modes of add/drop (or (de)multiplexing)
operation. It can add/drop narrow-band channels (each from/to one port) with
minimal loss, or can add/drop wideband channels (each from/to <i>M</i> ports) without spectral gaps,
with an additional loss not exceeding 1/3 (-4.8 dB), independent of <i>M</i>. Transceivers
can use either single-carrier modulation or orthogonal frequency-division
multiplexing (OFDM). We analyze and simulate OFDM-based systems to determine
key design requirements, especially for synchronization of cooperating transceivers.
A representative design achieves 1520-km reach with 1.4-dB margin in a dispersion-managed
network using only erbium-doped fiber amplifiers, improving average spectral
efficiency from about 2 to nearly 3 bits/s/Hz.
© 2012 IEEE
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