Introduction to the JOCN special issue on future PON architectures enabled by advanced technology

This JOCN Special Issue, which spans the September and October 2020 issues, investigates the future of passive optical networks (PONs) in light of new enabling technologies that are currently under consideration. The papers present a broad overview of topics of current interest, across both the physical and network layers. They investigate how new technologies (e.g., higher-speed direct detection transceivers, coherent systems, advanced digital signal processing, and new optoelectronic components) and new network-layer approaches may drive the medium- to long-term evolution of PONs

Real-Time DSP-Free 100Gbit/s/λ PAM-4 Fiber Access Link using EML and Direct Detection

A 100 Gbit/s/ λ PAM-4 fiber link with an optical budget of 30 dB and 20 km fiber reach is achieved in real time experiments. This is compliant with class A (20 dB) point to point (PtP) applications as mobile fronthaul for example, and with class N1 (29 dB) point to multipoint (PtMP) for residential market. We used an integrated externally modulated laser, an analog pre-equalizer, an optical booster amplifier and/or non-filtered preamplifier and direct detection without any digital signal processing (whether real-time or offline)

Health care help seeking behaviour among prisoners in Norway

<p>Abstract</p> <p>Background</p> <p>Prisoners are associated with high health care needs compared with the general population. This study aims to investigate prisoners' use of health service.</p> <p>Methods</p> <p>A cross-sectional study of 29 prisons in central and southern parts of Norway. A questionnaire was distributed to 1, 454 prisoners (90% response rate). Multilevel analyses were employed to analyse help seeking behaviour among the prisoners.</p> <p>Results</p> <p>Help seeking was substantially associated with sleep problems and drug problems. There was also a tendency for closed prisons as well as high staffing levels of healthcare professionals to be associated with elevated health care use.</p> <p>Conclusions</p> <p>This study suggests that sleep problems and drug use are most frequently associated with health service use. The differences in health care use between prisons suggest that the implementation of prison health care standards should be addressed.</p

Searching for a Common Ancestry: Linguistic and Biological Analogies in Comic Art

Sometimes comic book readers randomly encounter images in a comic that closely resemble images in other comics. This artwork could appear to the reader to have been copied, even directly 'lifted' from older or better-known comics. Sometimes, however, it does seem like any similarities have been generated independently, by chance or serendipity. In this note we draw on the work of Umberto Eco, William Lethaby, Walter Benjamin and Carl Jung to describe a multidisciplinary conceptual framework to analyse similar images using a heuristic approach involving two analogy concepts drawn from two different disciplines: linguistics and biology. When the origin of similarity between images is well documented, we propose the linguistic analogy approach can explain the phenomenon of recurrent images. When the similarity between two images appears to be unexplainable, or the result of mere chance, we propose that the concept of biological analogy can be helpful to explain the superficial resemblance of elements that have different origins

All-optical wavelength conversion using SOA nonlinearities

In this article the increasing use of WDM systems in telecommunications networks is highlighted, and the potential role for wavelength conversion in future upgrades of such systems is reviewed. Techniques for achieving wavelength conversion by all-optical means using nonlinearities in semiconductor optical amplifiers are explained, and experimental results obtained at BT Laboratories are used to illustrate the state of the art

Одна категория или несколько? Старославянские глаголы на -nǫ и лингвистическое профилирование

In this article, I will investigate the Old Church Slavonic verbs with the -nǫ suffix, both the verbs that keep the nasal suffix throughout the paradigm (e.g. plinǫti ‘spit’) and the verbs that display -Ø in the past tense (e.g. pogybnǫti ‘perish’). Do these verbs constitute one or more linguistic categories? Having compiled a complete database of relevant verbs in Old Church Slavonic, I will argue for a compromise, according to which all nǫ-verbs belong to the same category network, but display different centers of gravity (prototypes) within this network. The network hypothesis is corroborated by detailed statistical analysis (called ‘linguistic profiling’), which takes both semantic as well as formal properties of the verbs in question into account