A5012406666- Advanced Photonic Communication Systems
- Optical Network Technologies
- Photonic and Optical Devices
- Advanced Optical Network Technologies
- Semiconductor Lasers and Optical Devices
- Cellular Automata and Applications
- Coding theory and cryptography
- Advanced Adaptive Filtering Techniques
- Radio Frequency Integrated Circuit Design
- DNA and Biological Computing
- Advanced Fiber Optic Sensors
- graph theory and CDMA systems
- Ultra-Wideband Communications Technology
- Power Line Communications and Noise
- Energy Harvesting in Wireless Networks
- Gyrotron and Vacuum Electronics Research
- Advanced Wireless Communication Techniques
- Satellite Communication Systems
- Wireless Body Area Networks
University College London
2021-2025
Torrington Hospital
2023
Universidade Estadual de Campinas (UNICAMP)
2021
Ultra-wideband transmission is a promising, cost-effective solution to meet the increasing demand for data traffic in optical fiber systems. However, system performance and quality of (QoT) are limited by nonlinearity, particular, interchannel stimulated Raman scattering (ISRS), leading power transfer from short long wavelengths. As result, per-channel launch optimization required maximize throughput. In this paper, we investigate how transceiver noise impact total throughput QoT bandwidths...
A closed-form formula for the nonlinear interference (NLI) estimation using Gaussian noise (GN) model in presence of inter-channel stimulated Raman scattering (ISRS) is derived. The enables accurate NLI evolution along any portion fibre span together with arbitrary values optical losses. also accounts wavelength-dependent parameters, variable modulation formats and launch power profiles. suitable ultra-wideband (UWB) transmission systems its accuracy assessed a system 20 THz bandwidth over...
We demonstrate multipath interference-penalty-free S-band transmission over two G.654.E-compliant fibres with cable cutoff up to 1530 nm. No SNR degradation was observed across various distances and baud rates
A closed-form model for the nonlinear interference (NLI) in Raman amplified links is presented, formula accounts both forward (FW) and backward (BW) pumping schemes inter-channel stimulated scattering (ISRS) effect. The also an arbitrary number of pumps, wavelength-dependent fibre parameters, launch-power profiles, tested over a distributed Raman-amplified system setup. suitable ultra-wideband (UWB) optical transmission systems applied signal with 13 THz bandwidth corresponding to S-, C-, L-...
We model the transmission of ultrawideband signals, including wavelength-dependent fibre parameters: dispersion, nonlinear coefficient and effective core area.To that end, inter-channel stimulated Raman scattering Gaussian noise integral is extended to include these parameters.The integrals involved in this frequency-domain are numerically solved hyperbolic coordinates using a Riemann sum.The implementation designed work on parallel GPUs optimised for fast computational time.The valid...
Capacity enhancement by utilising the unused spectral bands of low-loss optical window standard single-mode fibre (SSMF) is a cost-effective solution for meeting future demand data traffic. The development amplifiers that can operate in different expected to play an integral part establishment multi-band networks. In this work, we perform experimental, analytical and numerical modelling transmission system using hybrid distributed-discrete Raman amplifier enabling signal amplification from...
Per-channel launch power optimisation in a hybrid-amplified link with optimised pump powers and wavelengths is described. Compared to using the optimum spectrally uniform power, an average SNR gain of 0.13 dB obtained against 0.56 for same system operating lumped amplifiers only.
A semi-analytical, real-time nonlinear-interference model including ASE noise in hybrid-amplified links is introduced. Combined with particle-swarm optimisation, the capacity of a 10.5-THz 117x57-km link was maximised, increasing throughput by 12% versus an EDFAs-only configuration.
A 223 km unrepeated transmission link is experimentally demonstrated using 121 nm optical bandwidth. Optimised bidirectional Raman amplification as well Thulium- and Erbium-doped fibre amplifiers enable a record throughput of 122.62 Tb/s.
Recently, we demonstrated a record single-mode fibre net throughput of 178.08 Tbit/s. In this paper, model experiment, investigating the main limitations and challenges behind total throughput, together with details some approaches to overcome them, an outlook for future ultra-wideband network design optimisation.
A closed-form model for the nonlinear interference in distributed Raman amplified links is presented, formula accounts both forward and backward pumping. The accurately estimates received SNR over a 10 THz bandwidth.
In this letter, we propose a Voronoi shaping method for lattices, Λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">s</sub> , and coding xmlns:xlink="http://www.w3.org/1999/xlink">c</sub> satisfying ⊆ <b xmlns:xlink="http://www.w3.org/1999/xlink">K</b> \mathbb Z <sup xmlns:xlink="http://www.w3.org/1999/xlink">n</sup> with K being an integer diagonal matrix. This assumption is easily satisfied lattices obtained from error-correcting codes. For...
We model the transmission of ultrawideband signals, including wavelength-dependent fibre parameters: dispersion, nonlinear coefficient and effective core area. To that end, inter-channel stimulated Raman scattering Gaussian noise integral is extended to include these parameters. The integrals involved in this frequency-domain are numerically solved hyperbolic coordinates using a Riemann sum. implementation designed work on parallel GPUs optimised for fast computational time. valid...
Using a recently developed fast integral ultrawideband Gaussian noise model, we quantify the achievable throughput under total optical power constraints for systems ranging from C-band to fully populated OESCLU bands using optimum launch powers, showing conditions when expanding bandwidth provides no additional throughput.
The accuracy of a recently-developed closed-form GN nonlinear interference model is evaluated in experimental 1065 km S+C+L band WDM transmission with backward Raman pumping. accurately estimates the and ASE total SNR error less than 0.6 dB.
Ultra-wideband, field-deployed metropolitan fibre transmission is experimentally demonstrated, measuring a record 202.3 Tb/s GMI and 189.5 after decoding with 20.9 dBm launch power lumped amplification only. An experimentally-optimised 5 dB pre-tilt over the 15.6 THz optical bandwidth was applied to overcome ISRS.
A closed-form model for the nonlinear interference in distributed Raman amplified links is presented, formula accounts both forward and backward pumping. The accurately estimates received SNR over a 10 THz bandwidth.
We report the penalty in SNR resulted from deviation of input power profile capacity-maximising one ultrawideband transmission. identify this for a fixed per-channel uncertainty and demonstrate upper bound achievable gain piecewise-constant launch per sub-band.
Probabilistic- and geometric-shaped (PS GS) constellations were compared in fourchannel transmission experiments. For 64-ary over 3022.5 km of SMF, PS outperformed GS by 0.17 bit/4D. short distance (232.5 km) 1024 points, this advantage diminishes due to increased transceiver noise, both schemes perform similarly.
A closed-form expression that estimates the nonlinear interference of arbitrary modulation formats in Raman amplified links is presented. Accounting for any pumping schemes and inter-channel stimulated scattering effect, formula applied to an optical bandwidth 20 THz validated using numerical simulations.
In this letter, we propose a Voronoi shaping method with reduced encoding complexity. The works for integer and coding lattices satisfying the chain $Λ_s \subseteq \textbf{K}\mathbb{Z}^n Λ_c$, $\textbf{K}$ an diagonal matrix. This assumption is easily satisfied obtained from error-correcting codes. For those lattices, using strategy, explicit set of coset representatives lattice complexity to linear code Our proposal illustrated in construction-D Gosset ($E_8$) Leech ($Λ_{24}$) as lattices.
Analytical models for the estimation of nonlinearity-caused impairments enable effective maximisation total data throughput. We demonstrate a 3 times improvement in per-channel mutual information when is redistributed from L-band to S-band.