| 1. |
- Borsatti, Davide, et al.
(författare)
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From IoT to Cloud: Applications and Performance of the MQTT Protocol
- 2020
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Ingår i: International Conference on Transparent Optical Networks. - 2162-7339. ; 2020-July, s. 1-4
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Konferensbidrag (refereegranskat)abstract
- A study of the MQTT publish/subscribe protocol with different QoS levels is presented with the aim to extend the Internet of Things (IoT) concept across access, edge and transport networks and reach cloud computing facilities. A simple testbed is set up with related software components to measure the end-to-end delivery latency between the publisher and the subscribers and the impact of the network delay caused by network configurations with different service deployments. In particular, the latency is shown to rise up to more than 7 times the average network delay when the QoS 2 level is applied, thus indicating that its adoption must be carefully considered.
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| 2. |
- Buraidah, M. H., et al.
(författare)
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Solar Module Using Dye-Sensitized Solar Cells
- 2018
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Ingår i: International Conference on Transparent Optical Networks. - 2162-7339. ; 2018-July
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Konferensbidrag (refereegranskat)abstract
- Solar module in this work comprises dye sensitized solar cells (DSSC) in series connection. The DSSC is made from transparent fluorine-doped tin oxide (FTO) glass on which two layers of titanium dioxide (TiO2) have been deposited and then soaked in ruthenium dye to form the photoanode. A phthaloylchitosan based gel polymer electrolyte containing iodide/triiodide redox mediator was sandwiched between the photoanode and platinum counter electrode. The two layers of TiO2 have different particle sizes. The first layer ( 15 nm particle size) acts as blocking layer whereas the second layer (particle size 21 nm) is mesoporous. The current-voltage characteristics and impedance measurements have been performed on the solar panel. Results show that the solar module comprising five DSSCs connected in series is capable to produce current around 0.7 mA•cm-2, voltage of 3.3 V and power density of 1.1 mW•cm-2 under solar simulator with light intensity of 18 mW•cm-2. The feasibility of the solar panel has been tested in practical applications e.g. operating small decorative items that require small power to function.
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| 3. |
- Cardoso, Evelin, et al.
(författare)
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A Heuristic Approach for the Design of UAV-Based Disaster Relief in Optical Metro Networks
- 2020
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Ingår i: International Conference on Transparent Optical Networks. - 2162-7339. - 9781728184234 ; 2020-July, s. 1-5
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Konferensbidrag (refereegranskat)abstract
- We propose a novel algorithm to dimension the backup elements in an optical metro network, by considering the adoption of Unmanned Aerial Vehicles (UAVs) and wireless interfaces to realize backup wireless links. Our key idea is to efficiently find the set of node pairs that have to be connected by means of multi-hop UAV-based wireless links, which are selected based on the simulation of multiple disaster events. Results, obtained over a set of meaningful scenarios, demonstrate that our solution can greatly reduce the total installation costs compared to a naive approach, which is instead solely tailored to the restoration of the disrupted links in a given disaster scenario.
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| 4. |
- Dmitriev, Alexander, 1975
(författare)
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Highly directional nanoantennas and plasmon-organic photovoltaics from bottom-up
- 2013
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Ingår i: International Conference on Transparent Optical Networks. - 2162-7339. - 9781479906826
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Konferensbidrag (refereegranskat)abstract
- I discuss the advances in bottom-up nanoplasmonics that rely on nanofabrication with hole-mask colloidal lithography (HCL). Two examples are highly directional nanoantennas in the visible, and enhanced plasmon-organic photovoltaics.
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| 5. |
- Dmitriev, Alexander, 1975
(författare)
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Magnetoplasmonics for Active Control of Light
- 2015
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Ingår i: 2015 17th International Conference on Transparent Optical Networks. - 2162-7339. - 9781467378802 ; , s. 1-
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Konferensbidrag (refereegranskat)abstract
- Here I discuss the possibilities given by combining magnetism and plasmonics to gain control over polarization and phase of light with magnetoplasmonic nanoantennas. The combination of high near-field confinement by nanoplasmonic antennas and enhanced magneto-optical effects in these antennas allows creating adaptive metasurfaces in the visible spectral range.
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| 6. |
- Etezadi, Ehsan, 1993, et al.
(författare)
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Proactive Spectrum Defragmentation Leveraging Spectrum Occupancy State Information
- 2023
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Ingår i: International Conference on Transparent Optical Networks. - 2162-7339. ; 2023-July
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Konferensbidrag (refereegranskat)abstract
- One of the main obstacles to efficient resource usage under dynamic traffic in elastic optical networks (EONs) is spectrum fragmentation (SF), leading to blocking of incoming service requests. Proactive spectrum defragmentation (SD) approaches periodically reallocate services to ensure better alignment of available spectrum slots across different links and alleviate blocking. The services for reallocation are commonly selected based on their properties, e.g., age, without detailed consideration of prior or posterior spectrum occupancy states. In this paper, we propose a heuristic algorithm for proactive SD that considers different spectrum fragmentation metrics to select services for reallocation. We analyze the relationship between these metrics and the resulting service blocking probability. Simulation results show that the proposed heuristic outperforms the benchmarking proactive SD algorithms from the literature in reducing blocking probability.
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| 7. |
- Furdek Prekratic, Marija, 1985, et al.
(författare)
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Enhancing optical network security with machine learning
- 2019
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Ingår i: International Conference on Transparent Optical Networks. - 2162-7339. ; 2019-July
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Konferensbidrag (refereegranskat)abstract
- As critical communication infrastructure, optical networks have a vital role in safe and dependable transmission of massive amounts of data, supporting essential societal services. However, these networks are inherently vulnerable to a multitude of deliberate, man-made attacks targeting service disruption at the physical layer. Physical-layer attack techniques can range in their scope and effects, level of sophistication, locality, detectability, etc. An example of a relatively unsophisticated attack method is a deliberate fiber cut, typically targeting critical network elements (e.g., links with the highest betweenness) and resulting in straightforward transmission interruption [1]. More refined attack techniques rely on the insertion of harmful signal (e.g. in- and out-of-band jamming) [2], or on external tampering with the fiber to degrade the transmission quality (e.g., polarization scrambling via fiber squeezing) [3]. Diverse attack techniques cause different effects, which complicates their detectability. For example, some attacks add unfilterable noise, some reduce the power of the affected optical channels, while some inflict changes in the state of polarization too quick for the coherent receiver to compensate [3]. Therefore, monitoring only the spectrum [4], or individual signal parameters such as the power, optical signal-to-noise ratio (OSNR), or presence of errors may result in inaccurate diagnostics and root cause attribution. This obstacle in quick recovery of affected services is further pronounced for newly emerging attack techniques whose effects may deviate from the attack signatures previously known to the network management system [5].The complexity of the evolving physical-layer security landscape and the intricate interplay of different optical performance monitoring (OPM) parameters in the presence of diverse attack methods can greatly benefit from the application of machine learning techniques capable of deep data analysis. In this talk, we present how different data analytics and machine learning approaches can be applied to interpret the OPM data reported from the commercially available coherent receivers to identify anomalous operation and trigger security threat warnings. The analytical techniques are applied to experimental data obtained from an operator's metropolitan testbed subjected to in- and out-of-band jamming, and external polarization scrambling attacks. We begin with an analysis of the optical signal degradation caused by the different attack methods. We then investigate the application of several supervised learning approaches that, once trained on the experimental data, can detect the presence of an attack and identify its type and intensity. The accuracy of several classifiers is scrutinized, along with the relevance of OPM parameters reported by the coherent receivers and the impact of missing features. To gain insight into the potential of the network to detect emerging, previously unseen attack techniques, we further analyse the performance of unsupervised learning techniques that detect the anomalies in signal parameters introduced by attacks. The presented findings help achieve timely and accurate detection of physical-layer attacks and serve as a prerequisite for fast and effective attack response and network recovery.
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| 8. |
- Hansson, Tobias, 1983, et al.
(författare)
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Theory of quadratic optical frequency combs
- 2016
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Ingår i: International Conference on Transparent Optical Networks. - 2162-7339. - 9781509014675 ; 2016-August
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Konferensbidrag (refereegranskat)abstract
- We present theoretical studies of optical frequency comb generation in dispersive quadratically nonlinear resonators. We introduce a mean field equation approach to model cavity enhanced second harmonic generation and find excellent agreement with recent experimental frequency comb observations. We also develop a more general approach based on a single envelope equation for both quadratic and Kerr nonlinear cavities. © 2016 IEEE.
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| 9. |
- Kotyński, R., et al.
(författare)
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Layered and core-shell uniaxial absorbers
- 2014
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Ingår i: International Conference on Transparent Optical Networks. - 2162-7339. - 9781479956005
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Konferensbidrag (refereegranskat)abstract
- We derive periodic multilayer absorbers with effective uniaxial properties similar to a perfectly matched layer (PML). This approximate representation of a PML is based on effective medium theory, and we call it an effective medium PML (EM-PML). We also show that cylindrical core-shell nanostructures derived from flat multilayers also exhibit very good absorptive and reflective properties despite the different geometry.
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| 10. |
- Lashgari, Maryam, 1991, et al.
(författare)
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A Shared-Path Shared-Compute Planning Strategy for a Resilient Hybrid C-RAN
- 2019
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Ingår i: International Conference on Transparent Optical Networks. - 2162-7339. ; 2019-July
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Konferensbidrag (refereegranskat)abstract
- One key challenge in 5G networks is to guarantee the survivability of services in the event of failures. This paper focuses on the hybrid cloud radio access network (H-CRAN) architecture. The proposed strategy guarantees survivability in the presence of failures affecting nodes/links in the midhaul segment (i.e., connecting the radio aggregation unit (RAU) nodes to their respective radio cloud center (RCC) nodes) as well as compute resources (i.e., servers) in the RCC nodes. In the envisioned strategy each RAU node is connected to a primary and a backup RCC node (i.e., with backup compute resources) via two node disjoint connectivity paths in the midhaul. The proposed strategy, called Shared-Path Shared-Compute Planning (SPSCP), lowers the overall design cost by trying to share as much as possible backup connectivity and compute resources among RAU nodes. This is made possible by introducing a shareability metric early into the RCC node selection process so that the chance of sharing backup resources is maximized. Simulation results show that the SPSCP strategy can lead to up to 28% cost savings when compared to conventional resilient design strategies
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