英语翻译As a result of rapid increase of amount of traffic data

英语翻译
As a result of rapid increase of amount of traffic data and transmission rates in
telecommunication,the wavelength division multiplexing (WDM) system has
been studied.An erbium-doped fiber amplifier (EDFA) which is a key component in this system needs flat gain spectra.One of the gain-flattening technologies is usage of an optical gain-flattening filter that has a reverse loss profile against the gain profile of EDFA.We have developed a design method using nonlinear fitting upon an etalon-type gain-flattening filter,so we can design a gain-flattening filter that has less error against any gain spectra than conventional methods.Thereupon we have manufactured modules designed by the method,and we can get excellent performance upon gain-flattening filters.In this paper,we demonstrate the design method and report performances of several types of gain-flattening filters for optical amplifiers that have different gain spectra.