A5064523796- Optical Network Technologies
- Advanced Photonic Communication Systems
- Advanced Optical Network Technologies
- PAPR reduction in OFDM
- Semiconductor Lasers and Optical Devices
- Cloud Computing and Resource Management
- Photonic and Optical Devices
- Interconnection Networks and Systems
- Software-Defined Networks and 5G
- Photonic Crystal and Fiber Optics
- Advanced Fiber Optic Sensors
- Telecommunications and Broadcasting Technologies
- Power Line Communications and Noise
- graph theory and CDMA systems
- Advanced Fiber Laser Technologies
Lumen (United Kingdom)
2021-2022
University College London
2018-2020
Work Research Centre
2017
Trinity College Dublin
2017
Dublin City University
2013-2017
We report the first double-nested antiresonant hollow core fiber. The fiber matches loss of commercial solid fibers in C-band (0.174 dB/km) and fundamentally improves it (0.22 O-band.
The rapid growth of traffic inside data centers caused by the increasing adoption cloud services necessitates a scalable and cost-efficient networking infrastructure. Space-division multiplexing (SDM) is considered as promising solution to overcome optical network capacity crunch support cost-effective scaling. Multi-core fiber (MCF) regarded most feasible efficient way realize SDM networks, its deployment seems very likely issue inter-core crosstalk (XT) not severe over short link spans (<1...
Disaggregated rack-scale data centers have been proposed as the only promising avenue to break barrier of fixed CPU-to-memory proportionality caused by main-tray direct-attached conventional/traditional server-centric systems. However, memory disaggregation has stringent network requirements in terms latency, energy efficiency, bandwidth, and bandwidth density. This paper identifies all key performance indicators a disaggregate IT resources while summarizing progress importance optical...
We report a hollow core Nested Antiresonant Nodeless Fibre (NANF) with loss of 0.65dB/km across the full C and L telecommunication bands. The fabricated fibre is 1.23km long, it effectively single moded over sufficiently long lengths, able to transmit data.
Current datacenters are based on server machines, whose mainboard and hardware components form the baseline, monolithic building block that rest of system software, middleware application stack built upon. This leads to following limitations: (a) resource proportionality a multi-tray is bounded by basic (mainboard), (b) allocation processes or virtual machines (VMs) available resources within boundary mainboard, leading spare fragmentation inefficiencies, (c) upgrades must be applied each...
The provision of both wireless and wired services in the optical access domain will be an important function for future passive networks (PON). With emergence 5th generation (5G) mobile communications, a move toward dense deployment small cell antenna sites, conjunction with cloud radio network (C-RAN) architecture, is foreseen. This type architecture greatly increases requirement high capacity fronthaul backhaul links. An efficient way achieving such connectivity to make use wavelength...
Filter bank multicarrier (FBMC) is a favourable candidate for next generation optical access networks due to its capability operate without cyclic prefix and high resilience synchronization errors in the system. In this paper, we analyze performance of FBMC upstream passive (PON), employment inter network unit (inter-ONU) frequency guard bands. By using both experimental work numerical simulations, impact relative time offsets on inter-ONU orthogonality studied. Furthermore, simulations are...
Quantum dash (Q-Dash) passively mode-locked lasers (PMLLs) exhibit significant low frequency relative intensity noise (RIN), due to the high mode partition (MPN), which prevents implementation of multilevel amplitude modulation formats such as PAM4. The authors demonstrate RIN mitigation by employing 8B/10B and Manchester encoding with PAM4 format. These techniques reduce overlap between spectral content low-frequency Q-dash devices, at expense increased overhead. 33.6 GHz free range PMLL...
5G communications will require the effective transmission of new radio signals through fiber networks, in order to facilitate proliferation antenna sites as well greater pooling resources. Next generation optical access networks can provide an efficient platform for mobile x-haul. Techniques discussed this paper shows how both wired and wireless services may be converged over a single infrastructure, networking harnessed flexible millimeter-wave radio-over-fiber.
We investigate the time-dependent crosstalk characteristics of trench-assisted multi-core fibers in a temperature controlled environment. Results indicate that temperature, PRBS length, modulation format and signaling rate impact intensity volatility inter-core crosstalk.
This paper examines and compares the use of orthogonal frequency division multiple access (OFDMA) generalized (GFDMA) multicarrier formats in next-generation passive optical networks (PONs) through experimentation numerical simulations. It is demonstrated that GFDMA presents a high resilience toward interference (MAI) compared to OFDMA at uplink channel PON. Moreover, two methods are proposed for achieving synchronization PONs, enabling spectral efficiency. These can lead elimination...
This paper proposes and experimentally evaluates a fully developed novel architecture with purpose built low latency communication protocols for next generation disaggregated data centers (DDCs). In order to accommodate capacity needs of IT elements (i.e., CPU, memory), this makes use high-capacity circuit-switched optical network interconnecting various end points that are equipped multi-channel silicon photonic based integrated transceivers. move further decrease the perceived between...
This paper showcases the first experimental demonstration of disaggregated memory using dRedDbox optical Data Centre architecture. Experimental results demonstrate 4-tier network scalability and performance system at physical application layer.
We demonstrate the creation of multiple spectral nulls, in a 10 Gb/s On Off Keyed signal with help DC balanced encoders. Within hybrid wired/wireless PON architecture, these generated nulls are subsequently used to transmit wireless 20 MHz bandwidth carrying Long Term Evolution (LTE) service. The level interference experienced on both wired 10G and is studied for various power levels, comparisons made scenarios where encoding not used. Results show significant system performance enhancements...
We study the use of monolithically integrated Discrete Mode lasers employing optical injection as a cost effective approach for improving performance hybrid wired/wireless OFDM PON using direct modulation, with transmission through 50 km SSMF. The Baseband signal operated at 12.5 Gb/s and 16 QAM LTE was used wireless signal.
The performance of GFDMA for upstream transmission in broadband passive optical networks is analysed. Results show that offers superior against multiple access interference compared to OFDM intensity modulated PONs.
Two parallel OCS topologies are proposed that deliver 95 nsec round-trip latency on disaggregated optical data center in a box system. They offer 40% cost and 68% power consumption efficiency at maximum IT resource utilization.
A wavelength-dependent crosstalk calculation formula for bi-directional MCF with unequal core pitches is derived. SDM-WDM based DCN simulations indicate that density and layout play a significant role on optimizing various scales of DCNs.
Space division multiplexing using multi-core fiber (MCF) is a promising solution to cope with the capacity crunch in standard single-mode based optical communication systems. Nevertheless, achievable of MCF limited by inter-core crosstalk (IC-XT). Many existing researches treat IC-XT as static interference, however, recent research shows that varies time, wavelength and baud rate. This inherent stochastic feature requires comprehensive characterization behaviour its application practical...
In this paper the transmission of FBMC based services for PON's using direct modulation low-cost Discrete Mode lasers is studied. The system composed 21 overlapping subcarriers each modulated by 16-QAM. We experimentally study performance such a directly in back-to-back and fibre scenarios up to 75 km SSMF.
In this paper the transmission of OFDM based wired/wireless services for hybrid PONs using direct modulation is studied. For overcoming limitations imposed by cost effective low bandwidth laser transmitters we make use novel monolithically integrated Discrete Mode lasers and optical injection. The system includes a wired signal operating at 12.5 Gb/s three wireless signals delivering Long Term Evolution (LTE) encoded with 16 QAM. We show experimentally how enforced in such systems when...
We report how hollow core fibres low latency can be used to increase the physical distance on an eCPRI based Radio Access Network (RAN) fronthaul link. show out 43km a commercial open RAN system.