Simulation Study on Performance Improvement by Gain Optimization in CWDM Metropolitan Ring Network (original) (raw)
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2007 Australasian Telecommunication Networks and Applications Conference, 2007
The bit error rate (BER) performance comparison of a wavelength division multiplexing (WDM) ring network in presence of four wave mixing (FWM) using repeated unequal spaced (RUS) and equal spaced (ES) scheme is reported taking into consideration of photo detector shot noise, beat noise components arising out of the beating of the signal with accumulated amplifier's spontaneous emission (ASE) and crosstalk introduced at each node due to four wave mixing. It is found that RUS provides lower BER than ES for a given number of channels, total bandwidth and number of hops. The performance results evaluated at a bit rate of 10Gbit/s show that for maintaining BER of 10 −9 , the maximum number of achievable nodes are approximately 260 and 120 corresponding to receive power level −4dBm and −7dBm respectively for RUS scheme and ES scheme when the hop length is 5km.
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IJAERD, 2018
In this digital era the communication demand has increased from previous eras due to introduction of new communication techniques. As we can see there is increase in clients day by day, so we need huge bandwidth and high speed networks to deliver good quality of service to clients. Fibre optics communication is one of the major communication systems in modern era, which meets up the above challenges. This utilizes different types of multiplexing techniques to maintain good quality of service without traffic, less complicated instruments with good utilization of available resources .Wavelength Division Multiplexing (WDM) is one of them with good efficiency. It is based on dynamic light-path allocation. Here we have to take into consideration the physical topology of the WDM network and the traffic. We have designed here an 8-channel WDM system and carried out detailed analysis to evaluate the dependencies of the performance evaluating parameters onto the various system parameters. This paper focuses on design of an multi channel WDM trans-receiver System and then optimizing its performance parameters. Simultaneously evaluation of dependencies of various performance evaluating parameters onto various system parameters was obtained. Moreover effect of optical amplification was obtained onto system performance.
A cost-effective approach to introduce an optical WDM network in the metropolitan environment
IEEE Journal on Selected Areas in Communications, 1998
A case study shows that an optical wavelength division multiplexing (WDM) network can be employed in a metropolitan network in a cost effective way. In part, cost savings are realized due to the total number of line terminals required and the fact that the dimensions of the electrical nodes decrease when exploiting optical cross connects (OXC's) to a large extent. Optical WDM rings are also an important building element when designing a metropolitan network. A number of the properties of WDM rings are classified, resulting in eight different ring architectures. Additional requirements arise when considering ring-to-ring connections. The extent of the rings chosen for the case study is validated from the transmission point of view by a simple model. Finally, as an alternative to an all-optical approach, an opto-electrical approach is presented. Index Terms-ACTS-METON, metropolitan network, Milan-Net, network cost/dimensioning analysis, optical add/drop multiplexer (OADM), optical crossconnect (OXC), optic-electronicoptic (OEO), optical network, ring architecture, ring protection, WDM.
An analysis of the input impedance of a Rectangular Dielectric Resonators Antenna (RDRA) operated at the dominant mode TE 111 is presented. The effects of the probe length and its position with respect to the resonator on the resonance frequency and the input impedance of the antenna are investigated. The antenna structure is numerically simulated using the High Frequency Structure Simulator (HFSS) software package based on the Finite Element Method (FEM). A few experimental set-ups were examined and resonance frequency and input impedance were measured. The results show good agreement between theory and experiments and also the significance of the distance between the resonator and feed probe in simulation.