269 research outputs found
Opportunities and Challenges for Long-Distance Transmission in Hollow-Core Fibres
No full textRecently NANF fiber prototypes have shown a steady decrease in loss. Theory predicts they could eventually outperform conventional fibers, in both loss and optical bandwidth. We investigate their potential impact on long-haul optical communication systems. (c) 2021 The Author(s
Potential system impact of low-loss antiresonant hollow core fibers
No full textRecent Anti-Resonant Hollow-Core Fiber (ARHCF) prototypes have shown a steady decrease in loss. Theoretical predictions indicate that they could eventually outperform conventional fibers, both for loss and optical bandwidth. In this paper we investigate the potential impact of hypothetical high-performance ARHCFs on long-haul optical communication systems
Opportunities and Challenges for Long-Distance Transmission in Hollow-Core Fibres
No full textAnti-resonant hollow-core fiber of the Nested Antiresonant Nodeless type (NANF) has been showing a steady decrease in loss over the last few years, gradually approaching that of standard Single-Mode Fiber (SMF). It already by far outperforms SMF as to non-linear effects, which are three to four orders of magnitude lower in NANF than in SMF. Theoretical predictions and experimental evidence also hint at a much wider usable bandwidth than SMF, potentially amounting to several tens of THz. Propagation speed is 50% faster, a key feature in certain contexts. In this paper we investigate the potential impact of possible future high-performance NANF on long-haul optical communication systems, assuming NANF continues on its current steady path towards better performance. We look at the system throughput in different long-haul scenarios, addressing links of various length, from 100~km to 4,000~km, and different NANF optical bandwidths, loss and total launch power. We compare such throughput with a benchmark state-of-the-art SMF Raman-amplified C+L system. We found that NANF might enable relative throughput gains vs.~the benchmark on the order of 1.5x to 5x, at reasonable NANF and system parameter values. We also study the problem of the impact of NANF Inter-Modal-Interference (IMI) on system performance and show that a value of -60~dB/km, close to the currently best reported values, is low enough to have no substantial harmful effect. We finally look at a more long-term scenario in which NANF loss gets below that of SMF and we show that in this context repeterless or even completely amplifierless systems might be possible, delivering 300-400 Tb/s per NANF, over 200 to 300~km distances. The system simplification and ease of wideband exploitation implied by these systems might prove quite attractive especially in densely populated regions where inter-node distances are modest. While several technological hurdles remain towards NANF systems becoming practical contenders, in our opinion NANF appears to have the potential to become an attractive and possibly disruptive alternative to conventional solid-core silica fibers
Ultra-Long-Haul WDM Transmission Using NANF Hollow-Core Fiber
No full textHollow-core fiber NANF prototypes have recently achieved lower loss and wider bandwidth
than SMF. Theory predicts further progress may be possible. We investigate the potential impact of
future high-performance NANFs on long-haul optical communication systems
The Long Disenchantment Reassessing UK-EU Relations from Accession to Brexit (1969–2016)
No full textThis book seeks to replace a comforting European narrative of British missed opportunities with a chronicle of the complexity of UK/EC-EU relations. After nearly a decade of Brexit (2016), it revisits the historical evolution of the relationship between Britain and Europe since the 1970s. Building on an in-depth study of primary and secondary sources, the author sheds new light on the intricacies of that relationshi
Closed form expressions of the nonlinear interference for UWB systems
No full textWe present a comprehensive closed-form GN/EGN model supporting ultra-wide-band systems spanning 50 THz of optical bandwidth. We show a case-study of 10x100km of SMF where we gradually increase the number of channels across the C,L,S,U,E bands while optimizing launch powe
STARNET: A Multi-gigabit-per-second Optical LAN Utilizing a Passive WDM Star
No full textWe propose a new broad-band local area network, STARNET, based on a physical passive star topology. Over a single physical network, STARNET offers all users both a moderate-speed packet network and a high-speed WDM circuit interconnect. Based on these two data transport facilities, several topological and protocol solutions are available to the users. As a result, STARNET supports traffic of widely different speed and continuity characteristics. Each node of the network requires only two lasers and its structure facilitates the achievement of frequency stabilization for the whole network. An effort toward an experimental demonstration of a 3 Gb/s per node, FDDI-compatible (at the packet network level) STARNET is currently in progress at the Optical Communication Research Laboratory of Stanford University
A Closed-Form Nonlinearity Model for Forward-Raman-Amplified WDM Optical Links
No full textWe propose an accurate nonlinearity closed-form model (CFM) for forward Raman-amplified WDM links which enables fast system optimization. We show a detailed study of a single-span link SNR maximization and flattening. (C) 2021 The Author(s
The Network of Excellence e-Photon/ONe
No full texte-Photon/ONe is a Network of Excellence (NoE) on optical networks funded by the EU in the VI Framework Program. NoEs aim at fostering the integration of the activities of the involved researchers and institutions, exploiting complementarity to achieve critical mass. “Virtual Departments” in e-Photon/ONe coordinate research activities on specific thematic areas. In this paper we present a summary of Virtual Departments views on the state-of-the-art and on future trends and key issues in research on optical networks
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