Rustam Ubaydullaev - Academia.edu (original) (raw)
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Centre National de la Recherche Scientifique / French National Centre for Scientific Research
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Papers by Rustam Ubaydullaev
Quantum Electronics, 2019
We discuss the design issues and characteristics of coherent fibre-optic communication networks t... more We discuss the design issues and characteristics of coherent fibre-optic communication networks taking into account the many physical effects that simultaneously influence signal propagation. Algorithms and easy-to-use ‘engineering’ techniques are proposed that allow network performance to be predicted and the design to be significantly simplified.
Quantum Electronics, 2016
This paper examines stimulated Brillouin scattering (SBS) suppression in multichannel DWDM system... more This paper examines stimulated Brillouin scattering (SBS) suppression in multichannel DWDM systems owing to nonlinear cross interaction between the channels and its effect on optical signal quality in a communication link. We present an experimental study of single-, three- and five-channel systems with NRZ channels. The optical signal quality in the three- and five-channel systems is shown to be better than that in the single-channel system. The reason for this is that cross-phase modulation broadens the spectrum of the signal and raises the SBS threshold. This in turn ensures a more pronounced optical signal quality improvement due to self-phase modulation.
Quantum Electronics, 2013
The nonlinear interference noise power was measured experimentally as a function of the signal po... more The nonlinear interference noise power was measured experimentally as a function of the signal power and the length of the fibre coherent 100-Gbit s-1 communication line, in which chromatic dispersion is not optically compensated. An expression was derived for the optimal signal power corresponding to a maximal excess of the measured optical signal-to-noise ratio (OSNR) over the OSNR required for conditionally error-free operation. The dependence of signal optimal power measured experimentally well agrees with the theoretical formula derived.
Quantum Electronics, 2019
A numerical model is proposed to describe the evolution of polarisation of a light wave propagati... more A numerical model is proposed to describe the evolution of polarisation of a light wave propagating through a telecommunication fibre with random linear birefringence in a magnetic field. As a result of statistical processing of a set of numerical simulation results, a convenient phenomenological formula is obtained for the first time for the dependence of the average value of the polarisation rotation angle on the magnetic field, the fibre parameters and its length. It is found that the average value of the polarisation rotation angle in a long telecommunication fibre in the representation of the Stokes vectors linearly depends on the applied longitudinal magnetic field (as in the classical Faraday effect for an isotropic medium) but is proportional to the root of the fibre length. It is theoretically shown and experimentally confirmed that the polarisation rotation angle for an extended segment of a telecommunication fibre (50 km) is two orders of magnitude less than that for an isotropic fibre of the same length and material.
Quantum Electronics, 2019
We discuss the design issues and characteristics of coherent fibre-optic communication networks t... more We discuss the design issues and characteristics of coherent fibre-optic communication networks taking into account the many physical effects that simultaneously influence signal propagation. Algorithms and easy-to-use ‘engineering’ techniques are proposed that allow network performance to be predicted and the design to be significantly simplified.
Quantum Electronics, 2016
This paper examines stimulated Brillouin scattering (SBS) suppression in multichannel DWDM system... more This paper examines stimulated Brillouin scattering (SBS) suppression in multichannel DWDM systems owing to nonlinear cross interaction between the channels and its effect on optical signal quality in a communication link. We present an experimental study of single-, three- and five-channel systems with NRZ channels. The optical signal quality in the three- and five-channel systems is shown to be better than that in the single-channel system. The reason for this is that cross-phase modulation broadens the spectrum of the signal and raises the SBS threshold. This in turn ensures a more pronounced optical signal quality improvement due to self-phase modulation.
Quantum Electronics, 2013
The nonlinear interference noise power was measured experimentally as a function of the signal po... more The nonlinear interference noise power was measured experimentally as a function of the signal power and the length of the fibre coherent 100-Gbit s-1 communication line, in which chromatic dispersion is not optically compensated. An expression was derived for the optimal signal power corresponding to a maximal excess of the measured optical signal-to-noise ratio (OSNR) over the OSNR required for conditionally error-free operation. The dependence of signal optimal power measured experimentally well agrees with the theoretical formula derived.
Quantum Electronics, 2019
A numerical model is proposed to describe the evolution of polarisation of a light wave propagati... more A numerical model is proposed to describe the evolution of polarisation of a light wave propagating through a telecommunication fibre with random linear birefringence in a magnetic field. As a result of statistical processing of a set of numerical simulation results, a convenient phenomenological formula is obtained for the first time for the dependence of the average value of the polarisation rotation angle on the magnetic field, the fibre parameters and its length. It is found that the average value of the polarisation rotation angle in a long telecommunication fibre in the representation of the Stokes vectors linearly depends on the applied longitudinal magnetic field (as in the classical Faraday effect for an isotropic medium) but is proportional to the root of the fibre length. It is theoretically shown and experimentally confirmed that the polarisation rotation angle for an extended segment of a telecommunication fibre (50 km) is two orders of magnitude less than that for an isotropic fibre of the same length and material.