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Bounds on the Transmit Power of b-Modulated NFDM Systems in Anomalous Dispersion Fiber

Delft Center for Systems and Control, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands
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Entropy 2020, 22(6), 639; https://doi.org/10.3390/e22060639
Received: 12 May 2020 / Revised: 3 June 2020 / Accepted: 5 June 2020 / Published: 9 June 2020
(This article belongs to the Special Issue Information Theory of Optical Fiber)
The performance of various nonlinear frequency division multiplexed (NFDM) fiber-optic transmission systems has been observed to decrease with increasing signal duration. For a class of NFDM systems known as b-modulators, we show that the nonlinear bandwidth, signal duration, and power are coupled when singularities in the nonlinear spectrum are avoided. When the nonlinear bandwidth is fixed, the coupling results in an upper bound on the transmit power that decreases with increasing signal duration. Signal-to-noise ratios are consequently expected to decrease, which can help explain drops in performance observed in practice. Furthermore, we show that there is often a finite bound on the transmit power of b-modulators even if spectral singularities are allowed. View Full-Text
Keywords: nonlinear Fourier transform; nonlinear frequency division multiplexing; b-modulation; power limitation nonlinear Fourier transform; nonlinear frequency division multiplexing; b-modulation; power limitation
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Chimmalgi, S.; Wahls, S. Bounds on the Transmit Power of b-Modulated NFDM Systems in Anomalous Dispersion Fiber. Entropy 2020, 22, 639.

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