Abstract
Rate-adaptive optical transceivers can play an important role in exploiting the available resources in
dynamic optical networks, in which different links yield different signal qualities. We study rate-adaptive joint
coding and modulation, often called coded modulation (CM), addressing non-dispersion-managed (non-DM) links,
exploiting recent advances in channel modeling of these links. We introduce a four-dimensional CM scheme, which shows
a better tradeoff between digital signal processing complexity and transparent reach than existing methods. We
construct a rate-adaptive CM scheme combining a single low-density parity-check code with a family of three signal
constellations and using probabilistic signal shaping. We evaluate the performance of the proposed CM scheme for
single-channel transmission through long-haul non-DM fiber-optic systems with electronic chromatic-dispersion
compensation. The numerical results demonstrate improvement of spectral efficiency over a wide range of transparent
reaches, an improvement over 1 dB compared to existing methods.
© 2013 IEEE
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