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Rate-Adaptive Coded Modulation for Fiber-Optic Communications
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DOI：10.1109/JLT.2013.2285672.png)
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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.
Keyword:
Fiber-optic communications
four-dimensional set partitioning
non-dispersion managed links
nonlinear channel model
probabilistic shaping
rate-adaptive coded modulation
期刊
IF:
4.8
论文数:
1.7W
被引数:
3.8W
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