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Ye N.,Tyndall National Institute | Gleeson M.R.,Tyndall National Institute | Sadiq M.U.,Tyndall National Institute | Roycroft B.,Tyndall National Institute | And 15 more authors.
Journal of Lightwave Technology | Year: 2015

Progress on advanced active and passive photonic components that are required for high-speed optical communications over hollow-core photonic bandgap fiber at wavelengths around 2 μm is described in this paper. Single-frequency lasers capable of operating at 10 Gb/s and covering a wide spectral range are realized. A comparison is made between waveguide and surface normal photodiodes with the latter showing good sensitivity up to 15 Gb/s. Passive waveguides, 90° optical hybrids, and arrayed waveguide grating with 100-GHz channel spacing are demonstrated on a large spot-size waveguide platform. Finally, a strong electro-optic effect using the quantum confined Stark effect in strain-balanced multiple quantum wells is demonstrated and used in a Mach-Zehnder modulator capable of operating at 10 Gb/s. © 2014 IEEE. Source


Walsh A.J.,Dublin City University | Mountjoy J.,Electric Ireland | Shams H.,University College London | Fagan A.,Electric Ireland | And 2 more authors.
Journal of Lightwave Technology | Year: 2015

A dual polarization doubly differential phase shift keying coherent optical packet receiver that is robust against frequency offset transients and polarization demultiplexing problems is described in detail for energy efficient reconfigurable networks. Its performance is not affected by large frequency offsets. This leads to greatly reduced waiting times compared with previous coherent optical packet receivers, which in turn can significantly increase throughput in the coherent optical packet switched networks. © 2015 IEEE. Source


Nsiri B.,Tunis el Manar University | Mhatli S.,University of Carthage | Mallouki N.,Tunis el Manar University | Ghanbarisabagh M.,Islamic Azad University at North Tehran | And 4 more authors.
Proceedings of the 2015 Science and Information Conference, SAI 2015 | Year: 2015

In this paper, the principles of coherent optical Fast-OFDM and the modem design with the employment of a Wiener-Hammerstein equalizer (W-H/E) are described. Afterwards, we test 16QAM Fast-OFDM with W-H/E for up to 3500 km of transmission. Finally, we compare coherent optical Fast-OFDM with conventional CO-OFDM using W-H/E. © 2015 IEEE. Source


Litvinova K.S.,United Technologies | Ahmad S.,Aston Medical Research Institute | Wang K.,Aston Medical Research Institute | Rafailov I.E.,Aston Institute of Photonic Technologies | And 4 more authors.
Progress in Biomedical Optics and Imaging - Proceedings of SPIE | Year: 2016

Endothelial dysfunction is directly linked to preeclampsia, a maternal hypertensive condition that is life threating for both the mother and the baby. Epidemiological studies show that women with a history of pre-eclampsia have an elevated risk for cardiovascular disease. Here we report a new non-invasive diagnostic test for preeclampsia in mice that allows us to non-invasively assess the condition of the animals during the experiment and treatment in established models of preeclampsia. A laser-based multifunctional diagnostics system (LAKK-M) was chosen to carry out non-invasive analysis of multiple parameters. The device was used to simultaneously record the microcirculatory blood flow and oxygen saturation, as well as fluorescence levels of endogenous fluorophores. Preliminary experiments were conducted on adenoviral (Ad-)- mediated overexpression of sFlt-1 (Ad-sFlt-1) to mimic preeclampsialike symptoms in mice. The recorded data displayed the ability of the LAKK-M diagnostics device to detect significant differences in perfusion measurements between the control and Ad-sFlt-1 treatment. Preliminary results provide a potential avenue to employ these diagnostics technology to monitor and aid in maintaining control of live animal conditions throughout the experiment and treatment. © 2016 SPIE. Source


Giacoumidis E.,Aston Institute of Photonic Technologies | Aldaya I.,Monterrey Institute of Technology | Jarajreh M.A.,Northumbria University | Tsokanos A.,University of Plymouth | And 5 more authors.
IEEE Photonics Technology Letters | Year: 2014

A reconfigurable nonlinear equalizer (RNLE) based on inverse Volterra series transfer function is proposed for dual-polarization (DP) and multiband coherent optical orthogonal frequency-division multiplexing (OFDM) signals. It is shown that the RNLE outperforms by 2 dB the linear equalization in a 260-Gb/s DP-OFDM system at 1500 km. The RNLE improves the tolerance to inter/intraband nonlinearities, being independent on polarization tributaries, modulation format, signal bit rate, subcarrier number, and distance. © 1989-2012 IEEE. Source

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