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This talk presents recent progress in optical signal processing based on compact waveguides fabricated mainly using silicon germanium alloys. Applications include supercontinuum generation, wavelength conversion and signal regeneration.
We firstly applied diversity reception technology to a real-time none-light-of-sight (NLOS) ultraviolet (UV) communication system based on a 9.3mW LED array. Field experiment with 4 receivers (Rxs) achieves bit error rate (BER) improvement, and related conclusions on single-input-multiple-output (SIMO) UV system design are given. Innovatively, the correlation characteristics in UV channel are studied...
In this paper, we have characterised Brillouin frequency shift (BFS) in single mode silica fibre. In particular, BFS was characterised in conventional Brillouin Optical Time Domain Analysis (BOTDA) at operating wavelength of 1550 nm by a pump-probe technique. In addition, we also presented Brillouin gain and Brillouin loss mechanism in BOTDA sensing system. The simulation results shows, BFS have strong...
Millimeter-waves (30–300 GHz) have interest due to the wide bandwidths available for carrying information, enabling broadband wireless communications. Photonics is a key technology for millimeter wave signal generation, recently demonstrating the use of photonic integration to reduce size and cost. In this paper, we present two dual-wavelength Photonic Integrated Circuit structures designed for signal...
The paper presents a hybrid orthogonal frequency division multiplexing (OFDM) — wavelength division multiplexing (WDM) visible light communication (VLC). Direct detection is adopted in place of complex digital signal processing such as channel estimation and channel equalization, or even forward error corrections. Generic red, green and blue light emitting diodes (LED) are used for high-speed WDM...
In this paper, the influence of the mobility feature of a ultraviolet (UV) communication system is explored via experiments, the performance at four different relative speeds within different valid working distance ranges are tested. In order to get the maximum communication distance of our UV communication system, a large number of repeated tests are made at 5 meter intervals. Meanwhile, Selective...
Segment Routing (SR) technology has been proposed to enforce effective routing strategies without relying on signaling protocols. In this paper, two SR implementations are presented and successfully demonstrated in two different network testbeds. The first implementation focuses on a software defined networking (SDN) scenario where nodes consist of OpenFlow switches and the SR Controller is a specifically...
. In this work a PON/mm-wave converged topology using single mode fiber (SMF) to multimode fiber (MMF) feeds is addressed supporting 60GHz indoor wireless access, standard PON, and a 60GHz wireless bridge providing a virtual PON extension. Proof-of-concept experiments are performed using a 1.2Gb/s OOK (NRZ) transmission over SMF-MMF-SMF link without or including 60GHz photonic up-conversion to be...
Inter-symbol interference (ISI) may become detrimental when the data rate rises in the atmospheric scattering UV channel. In this paper, we model the ISI effect due to delay spread in the UV channel and evaluate the approach of direct sequence spread spectrum (DSSS) in eliminating ISI and improve the system performance. Both the measured noise and newly reported experimental results of impulse response...
This paper proposes the use of the 2-D differential decoding to improve the robustness of dual-polarization optical packet receivers and is demonstrated in a wavelength switching scenario for the first time.
In this work, a spectrally efficient frequency division multiplexing (SEFDM) scheme based on radio over fiber (RoF) technology is proposed for the first time, so as to address next generation wireless data traffic demands on a cost, energy & spectrally efficient way. A proposed radio over fiber topology for beyond 4G deployment is addressed and a proof-of-concept SEFDM long term evolution (LTE)...
In this paper we assess the sensitivity of the most important topological parameters of an all-IP network with WDM transport planes with respect to a capital expenditure (CAPEX) optimization. We consider conservative and progressive traffic growth scenarios applied to several access network architectures in an effort to identify optimum metro and core router locations.
The need for higher bandwidth by customers urges the network providers to upgrade their networks. Fibre to the home or Fibre to the curb are two of the scenarios that are considered. To make a proper assessment on the economic viability, a good estimation of the roll-out costs of the networks are important. Geometric models are easy to use for this estimation, but can be inaccurate. In this paper...
Broadband access systems use electricity generated by power plants of which a proportion burn fossil fuels and release carbon dioxide (CO2) into the atmosphere. In Europe, the Code of Conduct for Broadband Access Devices provides voluntary targets for the maximum in-use power consumption of a range of access devices with a view to making year-on-year reductions as the technologies mature. Less is...
We carried out a simulation-based study assessing the performance of WDM direct-detection dispersion pre-compensated single-sideband (SSB) Nyquist-pulse-shaped QAM subcarrier modulated (N-SCM) systems using a receiver-based signal-signal beat interference (SSBI) cancellation technique. The performance improvement with SSBI cancellation, which compensates for the nonlinear distortion caused by square-law...
Optical coherent technology leads to the coexistence of signals with different modulation formats and different bit rates in optical networks. Due to this coexistence, several in-band crosstalk scenarios are possible. In this work, the impact of in-band crosstalk due to M-QAM interferers on the performance of PDM-QPSK and PDM-16-QAM coherent receivers at a bit rate of 100 Gbps is studied. The influence...
In this paper we overview our research activities on the Routing and Spectrum Assignment (RSA) in optical metro ring networks with flexible grid and distance-adaptive transceivers. We consolidate our existing mathematical models of the RSA problem in a single comprehensive formulation that can work under very diverse assumptions (variable-vs. fixed-spectrum transceivers, regeneration vs. no regeneration,...
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