Low-Cost and Robust 1-Gbit/s Plastic Optical Fiber Link Based on Light-Emitting Diode Technology

1-Gbit/s transmission is demonstrated over 50 m of step-index PMMA plastic optical fiber (1-mm core-diameter) using a commercial light-emitting diode. This is enabled by use of discrete multitone modulation with up to 64-QAM constellation mapping

A look into the future of in-building networks: roadmapping the fiber invasion

Optical fiber-based in-building network solutions can outperform in the near future copper- and radiobased solutions both regarding performance and costs. POF solutions are maturing, and can already today be cheaper than Cat-5e solutions when ducts are shared with electricity cabling. Advanced signal modulation techniques allow high-capacity services over POF. With their extra features of multi-wavelength transport and routing, fiber solutions offer a higher network throughput and flexibility, and improved sustainability

Robust two-dimensional pressure sensing mattress based on optical coupling between crossing polymer optical fibres

\u3cp\u3eWe present an innovative 2D pressure sensor for application below a mattress. It deploys a matrix of plastic optical fibre crosspoints which is robust, sensitive, scalable, flexible, waterproof, EMI insensitive, and only 3mm thick. Measurements show a nearly linear detection characteristic.\u3c/p\u3

Five-subcarrier multiplexed 64-QAM transmission over a 50-μm core diameter graded index perfluorinated polymer optical fiber

We experimentally demonstrate five-subcarrier multiplexed 64-QAM transmission over a 100 m graded index perfluorinated polymer optical fiber. EVM below 3.1% was achieved at 300 Mbit/s. 12.3 Gbit/s may be reached in the 2 GHz-6 GHz passband

Using higher-order passbands of multimode fibre for subcarrier multiplexing

The frequency response of multimode optical fibre (MMF) shows the existence of passbands in the higher frequency region above the -3dB baseband. By Subcarrier Multiplexing, these passbands can be used to accommodate a number of transmission channels for different services. In this way various groups of services may be integrated in a single MMF-based in-building or short-reach access infrastructure. In this paper, the power flow equation is solved numerically to investigate the passband response of MMF. The influence of modal delay, modal attenuation, mode coupling and launching conditions is studied. Results show large differences between overfilled launching and selective excitation launching

Five-subcarrier multiplexed M-QAM transmission over a 50-μm core diameter graded index perfluorinated polymer optical fiber

Quadrature Amplitude Modulation (QAM) together with subcarrier multiplexing technique can be used to deploy multiple transmission channels within a passband of multimode fiber (MMF), which is attractive for integrating different services in a single MMF platform. We present the experimental demonstration of simultaneous transmission of five subcarrier multiplexed signals in a 100 meter 50-µm core diameter graded index perfluorinated polymer multimode fiber link, where 16-QAM and 64-QAM were tested separately. The symbol rate of each subcarrier channel was 10 MBaud and the channel spacing was 20 MHz. The total bit rates for 16-QAM and 64-QAM were 200 Mbit/s and 300 Mbit/s, respectively. A passband region covering from 1.96 GHz to 6.04 GHz was used. Results showed bit error rate (BER) below 10-9 for each subcarrier channel. It shows the potential to reach a total capacity of 12.3 Gbit/s with 64-QAM by allocating more subcarrier channels which occupy the full passband. Further capacity increase is also possible by using higher symbol rate for each channel

Real-time two-dimensional pressure sensing for patient monitoring based on optical coupling between crossing polymer optical fibres

En la presente investigación se encuentra organizada de tal forma que es accesible entender la idea que se pretende plasmar en el tema, tan apasionante de lo que debe entenderse por la tentativa de punibilidad, para la configuración de los tipos penales establecidos en la Ley en grado de tentativa, debiendose de partir del principio de que para que exista la tentativa, se requiere de la antijuridicidad objetiva, que se castiga no únicamente la intención manifestada por el acto, sino aquella y el acto que se arremete el bien tutelado y sólo hay agresión cuando el medio es apto para producir el efecto prohibido por la norma penal y completa

Interleaved and partial transmission interleaved optical coherent orthogonal frequency division multiplexing

A novel group of interleaved orthogonal frequency division multiplexing (IL-OFDM) and partial transmission IL-OFDM (PT-IL-OFDM) schemes are proposed for optical coherent detection. In the interleaved operation, the odd (or even) subcarriers of an OFDM symbol are reserved (closed). Such an interleaved arrangement can gain the tolerance toward phase noise induced interchannel interference (PN-ICI). Meanwhile, the peak to average power ratio (PAPR) of an OFDM signal can be significantly reduced. However, half of the capacity is sacrificed for the interleaved operation. By exploring the time domain symmetry property of IL-OFDM, the concept of PT-IL-OFDM is proposed to double the capacity of IL-OFDM. Consequently, PT-IL-OFDM can gain the merits of low PAPR and a high tolerance toward PN-ICI without capacity sacrifice. Numerical simulation verified the advanced properties of IL-OFDM and PT-IL-OFDM

Real-time two-dimensional pressure sensing for patient monitoring based on optical coupling between crossing polymer optical fibres

Position detection is a key function needed for monitoring patients with sleep-related movement disorders. Tools are urgently needed to obtain a detailed patient-friendly long-Term assessment of sleep-related movements in the home situation. We present an optical two-dimensional pressure sensing system for real-Time patient monitoring that is based on optical coupling between crossing polymer or plastic optical fibres (POFs) and can easily be placed under a mattress in a home environment. Because the system deploys a grid of standard 1 mm diameter Step Index PMMA POF, it is low-cost, robust, flexible, compact, waterproof, scalable, not affected by external electrical fields, nor does it generate any electrical fields. Moreover, an alternative simple pressure sensitive POF crossing construction, based on local fibre bending is presented, which is more sensitive and more robust than crossing fibres left intact.</p