A5022616930- Optical Network Technologies
- Advanced Photonic Communication Systems
- Advanced Optical Network Technologies
- Semiconductor Lasers and Optical Devices
- Quantum Information and Cryptography
- Photonic and Optical Devices
- Quantum Computing Algorithms and Architecture
- Software-Defined Networks and 5G
- Quantum-Dot Cellular Automata
- Quantum Mechanics and Applications
- Advanced Fiber Laser Technologies
- PAPR reduction in OFDM
- Optical Wireless Communication Technologies
- Molecular Communication and Nanonetworks
- Quantum optics and atomic interactions
- Interconnection Networks and Systems
- Network Traffic and Congestion Control
- Advanced Fiber Optic Sensors
- Chemistry and Stereochemistry Studies
- ICT Impact and Policies
- Cloud Computing and Resource Management
- Power Line Communications and Noise
- Chaos-based Image/Signal Encryption
- Advanced Optical Sensing Technologies
- Blockchain Technology Applications and Security
BT Group (United Kingdom)
2023-2024
BT Research
2021-2024
University of Bristol
2014-2022
Agricultural Development Advisory Service (United Kingdom)
2022
Bangor University
2009-2014
University of Essex
2007-2009
This paper reports the work on next generation transponders for optical networks carried out within last years.A general architecture supporting super-channels (i.e., connection composed of several adjacent sub-carriers) and slice-ability sub-carriers grouped in a number independent with different destinations) is presented.Several transponder implementations transmission techniques are considered, highlighting advantages, economics complexity.Discussions include electronics, components,...
The fastest ever 11.25Gb/s real-time FPGA-based optical orthogonal frequency division multiplexing (OOFDM) transceivers utilizing 64-QAM encoding/decoding and significantly improved variable power loading are experimentally demonstrated, for the first time, incorporating advanced functionalities of on-line performance monitoring, live system parameter optimization channel estimation. Real-time end-to-end transmission an 64-QAM-encoded OOFDM signal with a high electrical spectral efficiency...
In this work we detail the strategies adopted in European research project IDEALIST to overcome predicted data plane capacity crunch optical networks. order for core and metropolitan telecommunication systems be able catch up with Internet traffic, which keeps growing exponentially, exploit elastic networks paradigm its astounding characteristics: flexible bandwidth allocation reach tailoring through adaptive line rate, modulation formats, spectral efficiency. We emphasize novelties stemming...
We present results from the first demonstration of a fully integrated SDN-controlled bandwidth-flexible and programmable SDM optical network utilizing sliceable self-homodyne spatial superchannels to support dynamic bandwidth QoT provisioning, infrastructure slicing isolation. Results show that SDN is suitable control plane solution for high-capacity flexible network. It able provision end-to-end requests according user requirements, considering unique characteristics underlying infrastructure.
Quantum key distribution (QKD) is a state-of-the-art method of generating cryptographic keys by exchanging single photons. Measurements on the photons are constrained laws quantum mechanics, and it from this that derive their security. Current public encryption relies mathematical problems cannot be solved efficiently using present-day technologies; however, vulnerable to computational advances. In contrast QKD generates truly random secured against advances more general attacks when...
An SDN based network planning framework utilizing machine-learning techniques and a network-scale monitoring database is implemented over an optical field-trial testbed comprised of 436.4km fibre. Adaption the spectral efficiency utilising probabilistic-shaping BVT on link performance prediction demonstrated.
This paper describes the problematic filter narrowing effect in context of next-generation elastic optical networks. First, three possible scenarios are introduced: transition from an actual fixed-grid to a flexi-grid network, generic full and proposal for filterless network. Next, we investigate different transmission techniques evaluate penalty introduced by filtering when considering Nyquist wavelength division multiplexing, single side-band direct-detection orthogonal frequency...
This paper reports all-optical, function programmable, transparent, intra- and inter-data center networking (DCN) using space time-division multiplexing (SDM/TDM) within data centers wavelength division (WDM) between centers. A multielement fiber is used for SDM transmission to provide a large quantity of optical links the top-of-racks (ToRs) programmable cluster switch. Beam-steering large-port-count switches, as central switches intercluster switch, single hop circuit switching solution,...
Dynamic and flexible optical networking enabled by NFV SDN are the key technology enablers for supporting dynamicity bandwidth requirements of emerging 5G network services. To achieve objective 5G, Network Services (NSes) must be often deployed transparently over multiple administrative technological domains. Such case presents security risks since a typical NS may comprise chain functions, each executed in different remote locations, tampering within infrastructure compromise their...
The recently created ITU-T Focus Group Network 2030 is leading network operators to identify the requirements and use cases that networks are expected fulfill for short, medium, long term within current decade. Essentially, need evolve their meet strict performance in several dimensions, including a large bandwidth support foreseen beyond-5G (B5G) services, such as digital twins volumetric video. To provide requirement sustainable scalable way, multi-band (MB) optical gradually extend legacy...
Detailed numerical investigations are undertaken of wavelength reused bidirectional transmission adaptively modulated optical OFDM (AMOOFDM) signals over a single SMF in colorless WDM-PON incorporating semiconductor amplifier (SOA) intensity modulator and reflective SOA (RSOA) the line termination network unit, respectively. A comprehensive theoretical model describing performance such scenarios is, for first time, developed, taking into account dynamic characteristics RSOA modulators as...
Record high 19.125 Gb/s real-time end-to-end dual-band optical OFDM (OOFDM) transmission is experimentally demonstrated, for the first time, in a simple electro-absorption modulated laser (EML)-based 25 km standard SMF system using intensity modulation and direct detection (IMDD). Adaptively baseband (0-2GHz) passband (6.125 ± 2GHz) RF sub-bands, supporting line rates of 10 9.125 respectively, are independently generated detected with FPGA-based DSP clocked at only 100 MHz DACs/ADCs...
Datacenter (DC) design has been moved toward the edge computing paradigm motivated by need of bringing cloud resources closer to end users. However, software defined networking (SDN) architecture offers no clue micro DCs (MDCs) for meeting complex and stringent requirements from next generation 5G networks. This is because canonical SDN lacks a clear distinction between functional network parts, such as core elements. Besides, there decoupling routing policy. In this paper, we introduce...
Abstract The evolution of Connected and Autonomous Vehicles (CAVs) promises improvements in our travel experience the potential to enhance road safety reduce environmental impact. This will be utilising highly diverse traffic environments that enable several advanced mobility applications. A secure, efficient, reliable, resilient communications infrastructure is required support developments these CAV systems. Next generation telecommunication networks seamlessly integrate terrestrial,...
The 7.5-Gb/s real-time end-to-end optical orthogonal frequency-division-multiplexing (OOFDM) transceivers incorporating variable power loading on each individual subcarrier are demonstrated experimentally using a live-optimized reflective semiconductor amplifier intensity modulator having modulation bandwidth as narrow 1 GHz. Real-time OOFDM signal transmission at 7.5 Gb/s over 25-km standard single-mode fiber is achieved across the <i xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Based on a comprehensive theoretical optical orthogonal frequency division multiplexing (OOFDM) system model rigorously verified by comparing numerical results with end-to-end real-time experimental measurements at 11.25Gb/s, detailed explorations are undertaken, for the first time, of impacts various physical factors OOFDM performance over directly modulated DFB laser (DML)-based, intensity modulation and direct detection (IMDD), single-mode fibre (SMF) systems without in-line amplification...
Quantum key distribution (QKD) has been identified as a secure method for providing symmetric keys between two parties based on the fundamental laws of quantum physics, making it impossible third party to copy states exchanged without being detected by sender (Alice) and receiver (Bob) altering original states. However, when QKD is applied in deployed optical network, physical-layer intrusions may occur links injecting harmful signals directly into fiber. This can have detrimental effect...
The feasibility of transmitting discrete-variable quantum key distribution channels with carrier-grade classical optical over multicore fibers is experimentally explored in terms achievable bit error rates, secret rates as well signal rates. A coexistence transmission record 11.2 Tb/s achieved for the simultaneously a DV-QKD channel 1 km-long 7-core fiber. Coexistence same fiber core identified dominant factor performance requiring bandpass filtering 17 nm to avoid effect Raman noise. Also,...
We demonstrate for the first time a four-node trusted-node-free metro network configuration with dynamic discrete-variable quantum key distribution DV-QKD networking capabilities across four optical nodes. The allows deployment of any QKD link between two nodes network, while QKD-aware centralised software-defined (SDN) controller is utilised to provide dynamicity in switching and rerouting. feasibility coexisting channel carrier-grade classical channels where both are C-band over...
The feasibility of implementing 128-QAM in off-the-shelf component-based real-time optical OFDM (OOFDM) transceivers incorporating advanced channel estimation, on-line performance monitoring and live parameter optimisation, is experimentally investigated, for the first time, intensity-modulation direct-detection (IMDD) single-mode fibre (SMF) multi-mode (MMF) transmission systems involving directly modulated DFB lasers. highest ever spectral efficiency 5.25bit/s/Hz demonstrated successfully...
A simple optical OFDM (OOFDM) synchronization technique utilizing subtraction and Gaussian windowing at the symbol rate is proposed implemented in FPGA-based OOFDM receivers. End-to-end real-time of 128-QAM-encoded signals raw bit rates 6.56Gb/s experimentally demonstrated, for first time, over directly modulated DFB laser-based 25km SMF intensity modulation direct detection (IMDD) systems. Experimental investigations show that synchronisation offers a number salient advantages including low...
End-to-end real-time experimental demonstrations are reported, for the first time, of aggregated 11.25Gb/s over 26.4km standard SMF, optical orthogonal frequency division multiple access (OOFDMA) PONs with adaptive dynamic bandwidth allocation (DBA). The demonstrated intensity-modulation and direct-detection (IMDD) OOFDMA PON system consists two network units (ONUs), each which employs a DFB-based directly modulated laser (DML) or VCSEL-based DML modulating upstream signals. Extensive...
The feasibility of utilising low-cost, un-cooled vertical cavity surface-emitting lasers (VCSELs) as intensity modulators in real-time optical OFDM (OOFDM) transceivers is experimentally explored, for the first time, terms achievable signal bit rates, physical mechanisms limiting transceiver performance and robustness. End-to-end transmission 11.25 Gb/s 64-QAM-encoded OOFDM signals over simple modulation direct detection, 25 km SSMF PON systems demonstrated with a power penalty 0.5 dB. low...
The first experimental demonstrator of 46–108Gb/s discrete-multi-tone (DMT) fixed-length variable capacity OPS over programmable, flexi-grid elastic optical path network (EON), orchestrated via multiple OpenFlow controllers in the framework SDN is presented.
We demonstrate for the first time a field trial of fully meshed metro network with dynamic QKD networking capabilities across four optical nodes in 5GUK Test Network, where DV-QKD quantum channels co-exist classical and are dynamically switched rerouted utilising QKD-aware SDN control.