Shortening Solitons for Fiber-Optic Transmission

Abstract

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Full Spectrum b-Modulation of Time-Limited Signals Using Linear Programming

“…The proposed method is very versatile due to its optimization approach and could also be used in other ways (e.g., for power control with conventional b-modulation, modulation of b(λ ) with λ not an eigenvalue, ...). It furthermore provides a systematic approach to soliton shortening, which has already been shown to be beneficial for soliton on-off keying in [6].…”

“…Inspired by the observation that the NFTs of conventionally modulated signals are typically strongly dominated by solitonic components [5], it was recently proposed to improve the pulse shapes of multi-solitons by adding a suitable continuous spectrum that shorten them to a desired finite duration [6]. The advantage of (multi-)soliton shortening over simple pulse truncation is that does not perturb the discrete spectrum.…”

“…As a proof of concept, it was shown that soliton shortening increased the spectral efficiency of a two-soliton on-off-keying transceiver by 40% over a 960 km link. In this paper, we present a new method for full spectrum b-modulation (FSbMOD) that unifies classic b-modulation for the continuous spectrum [3] with (multi-)soliton shortening for discrete spectra [6]. FSbMOD is the first method that can jointly modulate the continuous and discrete parts of the nonlinear spectrum under a finite duration constraint.…”

“…The FSbMOD algorithm is based on a systematic optimization approach and can thus be expected to succeed if solutions exist (and tuned properly). The solitonshortening methods in [6] in contrast were ad-hoc and could fail even though solutions exist.…”

Time-Limited Waveforms With Minimum Time Broadening for the Nonlinear Schrödinger Channel

“…Second, fundamental solitons are not time-limited, and hence consecutive fundamental solitons are not perfectly isolated. Generating a time-limited signal from a fundamental soliton can be done by simple truncation or by more sophisticated methods such as the soliton shortening methods recently introduced in [4]. Increasing the time window of the truncated or shortened soliton reduces the distortion and provides better isolation between the consecutive pulses along the NLS channel.…”