ABSTRACT

Gain and noise figure are two important parameter of EDFA. The gain flatness of EDFA is always desirable in DWDM system application in all optical network design.The objective of thethesis is to study EDFA and its application in 16 channels WDM system.In the first part, various EDFA pumping schemes are studied and analysed. The analysis is made for highpump power of 200 to 600 mW. Standard erbium doped fiber of length 16.2m is used. Input signal power is set at -34dBm at 1550 nm. Output power calculated is in the range of 15-25dBm, while the noise figure varied between 4.37-7.24dBm. Among the different pumping method bi-directional one has been found to have best performance.In the second part, a 16 channel EDFA-WDM system is designed and analysed in C-band wavelengths between 1548 to 1560 nm. To achieve gain flatness of EDFA,analysis has been carried out by varying pump power between 100 to 400 mW and input signal power between -20 to -35dBm. The gains are flattened within 38.7±1.37dB for wavelength range 1548 nm to 1560 nmusing optimized EDFA of length 10m. The working model consist of WDM transmitter, 16 channels MUX,dual port WDM analyzer , 980 nm pump laser and optimized EDFA as key components. The system layouts and analysis, in both the sections are made using Optisystem software.

Key words: EDFA-WDM SYSTEM, C-band wavelengths, WDM transmitter, Optisystem software