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We provide an analytical expression of the nonlinear phase induced by the Kerr effect that highlights its dependence on the modulation format and on the link parameters. We show that such a nonlinear phase must be used in regular-perturbation models in order to minimize their modeling error. We detail the case of dispersion-managed systems as an application example.
We illustrate a numerical method to compute the scattering data for the Zhakarov-Shabat system associated to the initial value problem for the nonlinear Schrödinger equation. This numerical method which, to our best knowledge, is the first method proposed to compute all scattering data under general assumptions, is based on the version of the Inverse Scattering Transform method proposed by one of...
This paper reports an analytical investigation, confirmed by numerical simulations, about the nonlinear noise impact on the performance of single-channel systems adopting generic modulation-detection formats and operating in long links with both managed and unmanaged dispersion compensation. Such a noise contribution is analyzed in terms of a pulse nonlinear interaction length, that depends on the...
We introduce a new numerical method for the computation of the inverse nonlinear Fourier transform and compare its computational complexity and accuracy to those of other methods available in the literature. For a given accuracy, the proposed method requires the lowest number of operations.
In the context of long-haul multi-band coherent OFDM transmission (at 400 Gbps), we propose an inter-band nonlinear interference canceler based on Volterra series. This new type of receiver significantly improves the BER performance compared to the standard third-order inverse Volterra series nonlinear equalizer.
We have revised soliton transmission in the new context of coherent optical detection optimizing and comparing digital backward propagation and in-line optical filtering as a means to suppress soliton timing and phase jitter. We find that in-line optical filtering allows one to improve the reach of the soliton system by up to the factor of two. We compared jitter suppression for transmission links...
We discuss necessary and sufficient conditions conducive to the reversal of nonlinear interaction in fiber optic transmission. While the complete information about complex amplitude and phase of the electric field certainly allows reversal of the nonlinear interaction, it is shown that knowledge about carriers' frequencies in WDM represents a sufficient condition for a successful compensation of the...
Eigenvalues of the associated equation of the nonlinear Schrödinger equation are mathematically invariable. We experimentally demonstrate the eigenvalues can be almost conserved for longer than 1,500km in wavelength division multiplexed optical fiber transmission line for the first time.
We investigated the reach increase obtained through non-linearity mitigation by means of transmission symbol rate optimization (SRO). First, we did this theoretically and simulatively. We found that for PM-QPSK systems at full-C-band the reach increase may be substantial, on the order of 10%–25%, with optimum symbol rates on the order of 2-to-6 GBaud. We extended the investigation to PM-16QAM, where...
Carrier phase estimation (CPE) is an integral part of the digital signal processing (DSP) of coherent optical communication systems as it compensates laser phase noise (LPN) introduced by free-running transmitter and local oscillating (LO) lasers. Nonlinear interactions during propagation are another source of correlated phase noise. In this paper, we show through simulations and in experiments that...
Digital back-propagation (DBP) was shown to have the potential to become the most promising method for compensation of fiber nonlinearities. However, apart from its high computational effort, the performance of DBP is dependent on the knowledge of the transmission link, i.e. the link's dispersion map as well as its power profile. In this contribution, we investigate the performance of DBP under the...
Wavelength division multiplexing is essential for achieving large capacity optical fiber transmission for any kind of modulation format. In this paper, we propose a wavelength division multiplexed optical eigenvalue modulated system and discuss its advantages and remaining issues for practical application.
We experimentally study the transmission of a 400 Gbps coherent 16-QAM multi-band OFDM superchannel over a 10×100 km G.652 fibre-based WDM transmission line. We investigate the performance of Volterra-based and digital back-propagation-based nonlinear equalizers over three scenarios with different quantities of inter-channel nonlinearities.
All-optical phase-preserving amplitude regeneration is an effective method to reduce nonlinear phase noise in long-haul transmission of phase-modulated signals. Here we review the latest results on a proposed differential phase shift keying (DPSK) regeneration scheme exploiting a compact architecture based on a saturated semiconductor optical amplifier. The scheme allows for amplitude-only signal...
In this paper we summarize our recently proposed work on the information theory analysis of regenerative channels. We discuss how the design and the transfer function properties of the regenerator affect the noise statistics and enable Shannon capacities higher than that of the corresponding linear channels (in the absence of regeneration).
We investigate the nonlinear performance of 8QAM-alternative 4D modulation format using GMI to evaluate the BICM capacity. Due to its constant modulus feature, the 4D-2A8PSK modulation has higher nonlinear threshold than Star-8QAM and Circular-8QAM.
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