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Passive optical networks are the most promising solution for access networks. Nowadays, Gigabit passive optical networks are very popular for Internet services providers. These networks have currently been limited by transmission speeds (up to 2.5 Gbit/s in downstream) which is not sufficient for all services (such as 4k video transfer etc.) because this speed is shared with all users in the network...
In order to manage Quality of Service (QoS) and energy efficiency in the optical access network, an online Dynamic Bandwidth Allocation (DBA) algorithm with adaptive sleep cycle is presented. This DBA algorithm has the ability to allocate an additional bandwidth to the end user within a single sleep cycle whose duration changes depending on the current buffers occupancy. The purpose of this DBA algorithm...
Coherent ultra-dense wavelength division multiplexing (UDWDM) architecture constitutes an approach to serve hundreds of users in a passive optical network (PON) with high spectrum efficiency. We propose and experimentally test a directly phase modulated distributed feedback (DFB) laser with a Nyquist shaped beat signal. An Rx sensitivity of −44 dBm at BER=10e-3 is achieved for dedicated 2.5 Gb/s/user...
Almost all data transmissions over long distances are transmitted through optical fibers. Fiber infrastructure is therefore very important and is necessary to protect it against fiber cuts caused e.g. by digging activity. Many network operators seeking appropriate solution for self protecting infrastructure system. We performed comparative measurement of the polarization based sensing system and the...
In this work we report experimental tests on the performance of FTTX accesses using the mPlane measurement plane, including lab and field environments and above all we point out the role of such measurement plane in Software Defined Network architectures. For such an aim we show an experimental procedure based on a central unit (orchestrator) that automatically manages GbE links in a regional network...
One of key technologies for future large-scale location-aware services in access is a scalable indoor localization technique. In this paper, we report preliminary results from our investigation on the use of deep neural networks (DNNs) for hierarchical building/floor classification and floor-level location estimation based on Wi-Fi fingerprinting, which we carried out as part of a feasibility study...
This paper gives an overview and background of optical access network deployment in Croatia. The most commonly used architectural solutions have been described. Optical access network development in Croatia has been put into a global as well as in the European Union context. All the challenges and the driving factors for optical access networks deployment are considered. Optical access network architectures...
A high performance copper-based transmission technology can enable fiber to the building and fiber to the home installations in a cost-effective copper/fiber hybrid network [1]. ITU has started a project for multi-gigabit copper access (MGfast [2]), as a successor of the G.fast [3] technology with the goal to serve symmetric services with 10 Gbit/s aggregated rate for each subscriber. This paper discusses...
In this paper, a distributed fiber sensing system based on Stimulated Brillouin scattering (SBS) effect is experimentally studied. Using Brillouin optical correlation domain analysis, the spatial resolution was affected by the reference frequency and the sideband component suppressed in the probe. The lower side band and the central wavelength was filtered by a fiber Bragg grating (FBG). We adjusted...
Analog Radio-over-Fiber (a-RoF) has been the subject of increased interest in relation to next-generation optical networks due to its spectral efficiency and lower deployment cost. Nonetheless, some complexity arises from electro-optical conversion of the information signal due to the non-linear characteristic of the modulator's transfer function which causes inter-channel interference and poses a...
In this paper, an Erbium-doped fiber-based, broadband super-fluorescent fiber source (SFS) is proposed and demonstrated. Using a broadband fiber Bragg grating (BFBG) with temperature compensated by attaching it upon a carbon fiber composite, it has a very low mean wavelength drift of 1.26 ppm/°C in temperature range 0 °C to 60 °C. The fluorescent fiber source structure is designed in a double-pass...
This paper evaluates the impact of the optical and electrical filtering on the performance of wavelength-division-multiplexed passive optical network (WDM-PON) transmission system with four-level pulse amplitude modulation (PAM-4) format and 40 Gbit/s (20 Gbaud/s) per-channel data rate for the optical C and L frequency bands. Paper determines the combination of the implemented electrical and optical...
This research experimentally reveals a sensor application in a future home in the IoE era that the possibility of using piezoelectric energy harvesting chips placed under the shoe insole for sensing foot pressure, or human activity while walking. Commercially available flat type piezoelectric PVDF polymer film chips were used for experiments. Two experiments are conducted: i) output voltage vs. chip...
The Fabry-Perot semiconductor laser is a simple, low-cost device with a wide spectrum of wavelengths that is nowadays used widely in optical access telecommunications networks. However, due to fiber's chromatic dispersion, the transmission distance and the bit rate of directly modulated Fabry-Perot laser links are limited. In this paper we demonstrate the possibility of injection locking a Fabry-Perot...
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