Performance Analysis to Enhance the Gain Flatness of L-Band EDFA In 16 Channel WDM System With Multiple FBGS

Abstract

Now a day, there is a requirement of high capacity networks therefore optical fiber comes in the daily use for the communication process like data transmission, video communication purposes. For multimedia purposes optical fiber comes in demand for the communication process over a long distance with the signal security and without any interruption of noise signal. The amplifiers using now a days can tolerate the effects such as linear and non linear effects. In order to fulfill the demands of internet, high capacity systems are required in the system. However, C-band is used by many researchers for researches in the communication and researchers are now in a different way for another wavelength window. Long band comes out to be the solution for the requirements in the problems like high gain and thermal effects. Thus, L-band EDFA is also required to amplify the long band wavelengths. But still the various undesired effects the low performance of the system. High Gain long-band designed EDFA amplifier, effective use of amplified spontaneous noise as a source to enhance gain by the process of reinjection in EDF fiber through the incorporation of FBGs. Various physical parameters of the EDF fiber and pumps are needed to be investigated so that the performance of system could be enhanced. These parameters may also provide the performance of longer distances in the systems.This thesis elaborates the limitation in L-band amplifier along with the problems in C-band EDFA also. The most important differences between the bands such as C-band and L-band EDFA’s are demonstrated in this study. Backward power affects the pumping efficiency that is observed by the amplifier spontaneous noise. Also the noise figure can be observed in the amplifier spontaneous by the back pumping effects. On the other hand, signal induced inhomogeneous affected by the ASE power affects in long band amplifiers. In the L-band gain is liable to temperature more than C-band signals. From the C-band actions two fundamentals actions are demonstrated to separate long-band thermal behavior. The effects i.e. thermal effects introduce the fluctuations in the output power and gain tilt also emerged in it. This output power is dependence on the thermal effects at 980 nm and 1480 nm are least or they can be independent in case of C-band. By reinjection of forward and backward ASE performance of gain and noise of L-EDFA achieved by through FBG leads to 1.23 gain flatness. The results show that gain with flattens in L-band EDFAs using FBGs.