Aron Denes Szabo - Academia.edu (original) (raw)
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Papers by Aron Denes Szabo
Optical Fiber Technology, 2021
We experimentally find a practical stimulated Brillouin scattering (SBS) threshold for broadband ... more We experimentally find a practical stimulated Brillouin scattering (SBS) threshold for broadband highperformance fiber optical parametric devices relying on dispersion-stable GeO 2-doped silica highly nonlinear fibers. We demonstrate that SBS limits the nonlinear phase shift in such fibers to ~0.3 rad per pump unless the SBS is mitigated in some way. We consequently derive corresponding limits on signal gain and conversion efficiency and find the required SBS mitigation factor for a range of fiber optic parametric devices' applications. Finally, we examine the level of SBS mitigation using air gaps and fiber tapers for implementation in polarization-insensitive fiber optic parametric devices employing bidirectional loops. We observe that an air gap or fiber taper are not very efficient for SBS mitigation as they provided an increase in SBS threshold up to 0.7 dB attributed primarily to their excess loss.
2020 European Conference on Optical Communications (ECOC), 2020
We experimentally demonstrate phase-sensitive fibre optic parametric amplification with gain >10d... more We experimentally demonstrate phase-sensitive fibre optic parametric amplification with gain >10dB and optical noise figure below 3dB for 11 channels spaced of 100 GHz. We employ all-fibre dispersion management to achieve a wideband phase-matching between signals and their copies.
Conference on Lasers and Electro-Optics, 2020
Gaussian distribution of nonlinear inter-channel crosstalk noise is numerically shown in fiber op... more Gaussian distribution of nonlinear inter-channel crosstalk noise is numerically shown in fiber optical parametric amplifiers with over 16 dB gain. Confidence of signal-to-crosstalk power ratio measurements is justified by consistency with error vector magnitude calculations.
Optical Fiber Communication Conference (OFC) 2021, 2021
All-optical wavelength conversion of dual-polarization signals over 9.6 nm in C+L-band is demonst... more All-optical wavelength conversion of dual-polarization signals over 9.6 nm in C+L-band is demonstrated in a twin-core highly nonlinear fibre for the first time. Conversion efficiencies between -1 dB and -8.5 dB for both cores are obtained simultaneously.
IEEE Photonics Technology Letters, 2012
We investigate the phase squeezing performance of an all-optical black-box binary phase-shift key... more We investigate the phase squeezing performance of an all-optical black-box binary phase-shift keyed phase regenerator constructed from periodically-poled lithium-niobate (PPLN) waveguides. Phase regeneration is performed with different levels of phase noise and constant amplitude noise added to the phase modulated input. We experimentally show that, for moderate phase noise, unwanted phase-to-amplitude noise conversion can be minimized without degradation of the phase squeezing performance, by controlling the signal-to-pump power ratio at the input to the PPLN-based phase-sensitive regenerator.
IEEE Photonics Technology Letters, 2012
Based on a non-distributed numerical model including fiber birefringence and orthogonal mode coup... more Based on a non-distributed numerical model including fiber birefringence and orthogonal mode coupling, we investigate the effects of saturable absorber (SA) parameters on the mode-locking of a realistic Erbium fiber ring laser. We compute the pulse evolution in the oscillator where the pulse properties are also affected by the intracavity polarization controller (PC). Simultaneous effect of the SA and PC
2013 18th OptoElectronics and Communications Conference held jointly with 2013 International Conference on Photonics in Switching
In this work the phase sensitive properties of a dual pump phase sensitive amplifier based on a b... more In this work the phase sensitive properties of a dual pump phase sensitive amplifier based on a bi-directional periodically poled lithium niobate are numerically and experimentally investigated.
電子情報通信学会技術研究報告 Ns ネットワークシステム, Jun 14, 2012
To increase the signal power in optical networks is crucial to extend the maximum transmission di... more To increase the signal power in optical networks is crucial to extend the maximum transmission distance. However, the non- linear behavior of the optical fiber limits the signal power e.g. the span of the all-optical network. This paper presents an ana- lytical model and calculation results for the signal quality degradation in an 8-channel and in an 18-channel, 2.5 Gbps
Optical Fiber Technology, 2015
ABSTRACT Based on an iterative numerical approach, we model continuous wave (CW), high power, cla... more ABSTRACT Based on an iterative numerical approach, we model continuous wave (CW), high power, cladding-pumped Yb-doped fiber amplifiers with bi-directional pumping of the star-shaped cladding. Accurate prediction of over 1 kW output power is demonstrated, and the calculation results are in good agreement with experiments. Absorption and emission cross sections for the used doped fiber are determined experimentally in advance. Using the model at such high powers, it is shown that the Giles model parameter of the effective overlap integral in the star-shaped cladding may vary coupling the light from diodes with different numerical apertures, which is believed caused by the increasing amount of pump light launched into higher order modes.
2013 IEEE International Conference on Communications (ICC), 2013
Analytical models for all-optical phase-sensitive BPSK and QPSK regeneration are presented, metri... more Analytical models for all-optical phase-sensitive BPSK and QPSK regeneration are presented, metrics for phase and intensity regeneration efficiency are derived. The models are based on the general principle of operation and do not depend on the regenerator's physical structure. They offer the possibility of simple network planning and comparison of regenerators with fundamentally different physical structures. The models are applied to a simple transmission line with ten equally spaced phase-sensitive regenerators. Nonlinear intensity-to-phase noise transform is observed and signal degradation is described as function of intensity and phase regeneration efficiency.
Optical Fiber Communication Conference/National Fiber Optic Engineers Conference 2013, 2013
2008 6th International Symposium on Communication Systems, Networks and Digital Signal Processing, 2008
2013 15th International Conference on Transparent Optical Networks (ICTON), 2013
An all-optical regenerator architecture for quadrature phase shift keying format using periodical... more An all-optical regenerator architecture for quadrature phase shift keying format using periodically poled lithium niobate waveguides is presented. As opposed to current fiber-based solutions, the proposed phase-sensitive structure offers small size and good stability while granting similarly efficient operation. Direct quadratic nonlinear interactions are exploited instead of the commonly used cascaded non-linear solutions to reduce complexity and increase efficiency. Mathematical models of the main components are implemented and regeneration efficiency is found to be sufficient for future applications.
2012 17th Opto-Electronics and Communications Conference, 2012
We investigate inter-channel interference as a function of channel-spacing for PSAs constructed f... more We investigate inter-channel interference as a function of channel-spacing for PSAs constructed from PPLN waveguides. We use 9*50GHz spaced input channels and show that the second order non-linearity can be advantageous for multi-channel PSA applications.
IEEE Photonics Technology Letters, 2014
Optical Fiber Communication Conference, 2012
We investigate phase squeezing of up to four signal channels in a non-degenerate phase-sensitive ... more We investigate phase squeezing of up to four signal channels in a non-degenerate phase-sensitive amplifier constructed from periodically-poled-lithium-niobate waveguides and observe that additional channels have little impact the phase squeezing performance.
Optical Fiber Technology, 2021
We experimentally find a practical stimulated Brillouin scattering (SBS) threshold for broadband ... more We experimentally find a practical stimulated Brillouin scattering (SBS) threshold for broadband highperformance fiber optical parametric devices relying on dispersion-stable GeO 2-doped silica highly nonlinear fibers. We demonstrate that SBS limits the nonlinear phase shift in such fibers to ~0.3 rad per pump unless the SBS is mitigated in some way. We consequently derive corresponding limits on signal gain and conversion efficiency and find the required SBS mitigation factor for a range of fiber optic parametric devices' applications. Finally, we examine the level of SBS mitigation using air gaps and fiber tapers for implementation in polarization-insensitive fiber optic parametric devices employing bidirectional loops. We observe that an air gap or fiber taper are not very efficient for SBS mitigation as they provided an increase in SBS threshold up to 0.7 dB attributed primarily to their excess loss.
2020 European Conference on Optical Communications (ECOC), 2020
We experimentally demonstrate phase-sensitive fibre optic parametric amplification with gain >10d... more We experimentally demonstrate phase-sensitive fibre optic parametric amplification with gain >10dB and optical noise figure below 3dB for 11 channels spaced of 100 GHz. We employ all-fibre dispersion management to achieve a wideband phase-matching between signals and their copies.
Conference on Lasers and Electro-Optics, 2020
Gaussian distribution of nonlinear inter-channel crosstalk noise is numerically shown in fiber op... more Gaussian distribution of nonlinear inter-channel crosstalk noise is numerically shown in fiber optical parametric amplifiers with over 16 dB gain. Confidence of signal-to-crosstalk power ratio measurements is justified by consistency with error vector magnitude calculations.
Optical Fiber Communication Conference (OFC) 2021, 2021
All-optical wavelength conversion of dual-polarization signals over 9.6 nm in C+L-band is demonst... more All-optical wavelength conversion of dual-polarization signals over 9.6 nm in C+L-band is demonstrated in a twin-core highly nonlinear fibre for the first time. Conversion efficiencies between -1 dB and -8.5 dB for both cores are obtained simultaneously.
IEEE Photonics Technology Letters, 2012
We investigate the phase squeezing performance of an all-optical black-box binary phase-shift key... more We investigate the phase squeezing performance of an all-optical black-box binary phase-shift keyed phase regenerator constructed from periodically-poled lithium-niobate (PPLN) waveguides. Phase regeneration is performed with different levels of phase noise and constant amplitude noise added to the phase modulated input. We experimentally show that, for moderate phase noise, unwanted phase-to-amplitude noise conversion can be minimized without degradation of the phase squeezing performance, by controlling the signal-to-pump power ratio at the input to the PPLN-based phase-sensitive regenerator.
IEEE Photonics Technology Letters, 2012
Based on a non-distributed numerical model including fiber birefringence and orthogonal mode coup... more Based on a non-distributed numerical model including fiber birefringence and orthogonal mode coupling, we investigate the effects of saturable absorber (SA) parameters on the mode-locking of a realistic Erbium fiber ring laser. We compute the pulse evolution in the oscillator where the pulse properties are also affected by the intracavity polarization controller (PC). Simultaneous effect of the SA and PC
2013 18th OptoElectronics and Communications Conference held jointly with 2013 International Conference on Photonics in Switching
In this work the phase sensitive properties of a dual pump phase sensitive amplifier based on a b... more In this work the phase sensitive properties of a dual pump phase sensitive amplifier based on a bi-directional periodically poled lithium niobate are numerically and experimentally investigated.
電子情報通信学会技術研究報告 Ns ネットワークシステム, Jun 14, 2012
To increase the signal power in optical networks is crucial to extend the maximum transmission di... more To increase the signal power in optical networks is crucial to extend the maximum transmission distance. However, the non- linear behavior of the optical fiber limits the signal power e.g. the span of the all-optical network. This paper presents an ana- lytical model and calculation results for the signal quality degradation in an 8-channel and in an 18-channel, 2.5 Gbps
Optical Fiber Technology, 2015
ABSTRACT Based on an iterative numerical approach, we model continuous wave (CW), high power, cla... more ABSTRACT Based on an iterative numerical approach, we model continuous wave (CW), high power, cladding-pumped Yb-doped fiber amplifiers with bi-directional pumping of the star-shaped cladding. Accurate prediction of over 1 kW output power is demonstrated, and the calculation results are in good agreement with experiments. Absorption and emission cross sections for the used doped fiber are determined experimentally in advance. Using the model at such high powers, it is shown that the Giles model parameter of the effective overlap integral in the star-shaped cladding may vary coupling the light from diodes with different numerical apertures, which is believed caused by the increasing amount of pump light launched into higher order modes.
2013 IEEE International Conference on Communications (ICC), 2013
Analytical models for all-optical phase-sensitive BPSK and QPSK regeneration are presented, metri... more Analytical models for all-optical phase-sensitive BPSK and QPSK regeneration are presented, metrics for phase and intensity regeneration efficiency are derived. The models are based on the general principle of operation and do not depend on the regenerator's physical structure. They offer the possibility of simple network planning and comparison of regenerators with fundamentally different physical structures. The models are applied to a simple transmission line with ten equally spaced phase-sensitive regenerators. Nonlinear intensity-to-phase noise transform is observed and signal degradation is described as function of intensity and phase regeneration efficiency.
Optical Fiber Communication Conference/National Fiber Optic Engineers Conference 2013, 2013
2008 6th International Symposium on Communication Systems, Networks and Digital Signal Processing, 2008
2013 15th International Conference on Transparent Optical Networks (ICTON), 2013
An all-optical regenerator architecture for quadrature phase shift keying format using periodical... more An all-optical regenerator architecture for quadrature phase shift keying format using periodically poled lithium niobate waveguides is presented. As opposed to current fiber-based solutions, the proposed phase-sensitive structure offers small size and good stability while granting similarly efficient operation. Direct quadratic nonlinear interactions are exploited instead of the commonly used cascaded non-linear solutions to reduce complexity and increase efficiency. Mathematical models of the main components are implemented and regeneration efficiency is found to be sufficient for future applications.
2012 17th Opto-Electronics and Communications Conference, 2012
We investigate inter-channel interference as a function of channel-spacing for PSAs constructed f... more We investigate inter-channel interference as a function of channel-spacing for PSAs constructed from PPLN waveguides. We use 9*50GHz spaced input channels and show that the second order non-linearity can be advantageous for multi-channel PSA applications.
IEEE Photonics Technology Letters, 2014
Optical Fiber Communication Conference, 2012
We investigate phase squeezing of up to four signal channels in a non-degenerate phase-sensitive ... more We investigate phase squeezing of up to four signal channels in a non-degenerate phase-sensitive amplifier constructed from periodically-poled-lithium-niobate waveguides and observe that additional channels have little impact the phase squeezing performance.