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We developed a techno-economic network planning tool for deployment of PON networks in large cities involving hundreds of thousands of end-users. The tool use techno-economic data and street-aware algorithms to estimate the global cost of the network. In the present new work, we extend the application scenario of our planning tool to estimate the increase of cost when different types of protection...
In this paper we propose an optimization framework for multiple deployment of PON in a wide region with very large number of users, with different bit rate demands, serviced by many central offices, as it may practically happen in a large city that plans a massive introduction of Fiber to the Home technologies using PON. We propose an algorithm called Optimal Topology Search (OTS), which is based...
We experimentally studied the implementation of forward error correction in software defined radio access networks by means of transceivers based on USRP. We tested the system in a 2 m wireless link and obtain an improvement in the performance of 4 dB for BPSK and QPSK modulation formats and almost of 5 dB for 8-PSK when adding a Reed Solomon code (127, 123) for reducing the errors. A characterization...
An optical access network with LTE, optical data, and CATV signals is experimentally studied. Rx sensitivities of −27.5 dBm, −26 dBm, and −24 dBm were obtained at bitrates of 1.25 Gb/s, 2.5 Gb/s, and 10 Gb/s at BER=10−4; whereas Rx optical power of −27 dBm is needed at an EVM of 28.2% for LTE. The minimum spectral separation is also measured showing the effect of the high power CATV on the other two...
In this paper we propose a novel algorithm (which combines an integer linear programming ILP model with heuristic approaches) for finding optimal multiple PON deployments in large urban regions with very high number of users and with different bit rate demands. Our algorithm finds optimal solutions employing real city maps (by an ad-hoc developed interface with the open source OpenStreetMap database)...
We experimentally transmitted jointly an OFDM data and LTE signal in a single wavelength within an optical access network. The LTE was centered at a frequency of 1.5GHz while OFDM was left at baseband. After characterization of the waveforms and the receiver the LTE RF power was optimized to improve the performance of the system. Both signals were properly detected with a single photodiode. Receiver...
A study of inline optical filtering in wavelength dhision multiplexing access networks based on intensity modulation and direct-detection is presented. The system was experimentally tested with several bitrates and filter bandwidths representing the effect of passing through an arrayed waveguide grating. A minimum filter bandwidth of 0.08nm was required to avoid penalties higher than ldB at BER=2·10...
We evaluate the duty cycle in RZ coded signals in an optical access network emulated with two users at a bit rate of 10 Gb/s. An optimum duty cycle of 75% was found for a fibre link of 25 km. This value remained when increasing the launched power up to 12 dBm. The range for 1 dB penalty was between 60% and 80%. In comparison with NRZ, with the optimum duty cycle the performance in terms of the receiver...
The problem related with the optimization of a DWDM-PON can be approached in many different ways. The most cost-sensitive parameter for PON design is the length of optical fiber and, in a lower grade of sensitiveness, the number of distribution nodes, like the AWG employed for channel multiplexing/demultiplexing. The first step for finding the topology which minimizes the network deployment cost is...
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