@ARTICLE{comparative2015,
     Title={Comparative analysis of WDM system using Cascaded amplifiers in Optical wireless channel over a distance of 10000 km.},
     Author={Nipun Vinayak, Amit Gupta},
     Journal={SOP TRANSACTIONS ON SIGNAL PROCESSING},
     Volume={2},
     Number={2},
     Pages={1-10},
     Publisher={SOP},
     Year={2015}
}