Performance Analyses of Dense Wavelength Division Multiplexing in Ring Metropolitan Area Networks With and Without Erbium Doped Fibre Amplifier
This Paper investigates the performance of dense wa v length division multiplexing ring networks implemnted in the metropolitan areas for the purpose of deploy ing higher bit rates. The investigations were carri ed out in the Cband operating region by deploying four channels over a single standard mode fibre with channel spacing of 100GHz at 10Gbps. Transmissions of 108km and 7km with and without Erb ium Doped Fibre Amplifier (EDFA) were achieved with a 10 fixed value of Bit Error Rate (BER). The performanc e was measured through a bit rate analyser using an eye diagram.
A Novel Approach on DWDM based metropolitan ring network
In the past few years, there are many approaches to increase in the bandwidth requirements of modern telecommunication networks. This has been mainly driven by the rise in the degree of popularity of the Internet and increased ever demand of multimedia applications A router or any switch can associate into a dense wavelength division multiplexing (DWDM) by transfer packets directly onto a wavelength without the use of a SONET or SDH TDM. In effect, a TDM can be replaced with an optical DWDM, which can increase bandwidth utilization, facilitate networking, and reduce cost. DWDM can defer or completely expel the need for extra fiber. DWDM state into the metropolitan interoffice (IOF) and access networks, it will rely on the optical add/drop multiplexer (OADM) as its core network element for metro optical networking. DWDM technology indeed now offers bandwidth as currently available systems support up to about 100 wavelengths per fiber; qualify a single fiber to carry a few hundred gigabits per second of information. In this paper we propose to increases the data transfer rate over the optical fiber with different modulation techniques.
The REX-ISOLDE project
The Radioactive Beam Experiment REX-ISOLDE [1–3] is a pilot experiment at ISOLDE (CERN) testing the new concept of post acceleration of radioactive ion beams by using charge breeding of the ions in a high charge state ion source and the efficient acceleration of the highly charged ions in a short LINAC using modern ion accelerator structures. In order to prepare the ions for the experiments singly charged radioactive ions from the on-line mass separator ISOLDE will be cooled and bunched in a Penning trap, charge bred in an electron beam ion source (EBIS) and finally accelerated in the LINAC. The LINAC consists of a radiofrequency quadrupole (RFQ) accelerator, which accelerates the ions up to 0.3 MeV/u, an interdigital H-type (IH) structure with a final energy between 1.1 and 1.2 MeV/u and three seven gap resonators, which allow the variation of the final energy. With an energy of the radioactive beams between 0.8 MeV/u and 2.2 MeV/u a wide range of experiments in the field of nuclear spectroscopy, astrophysics and solid state physics will be addressed by REX-ISOLDE.