Modelling of hybrid fiber pre-amplifier for WDM system / Mohd Hazwan Halmi

Recently, the demand of fiber optic has been at an extraordinary rate. The service provider needs to extend their Wavelength Division Multiplexing (WDM) network in long distances of the optical transmission network. Therefore, to maintain a good quality of optical transmission signal, they need to locate several optical amplifiers such as Semiconductor Optical Amplifier (SOA) and Erbium Doped Fiber Amplifier(EDFA) in their transmission network. However, those conventional optical amplifiers does not relevant enough to provide a good transmission quality in high speed data transfer. The answer to this issue is hybrid amplifier. The purpose of this thesis is to design and analyze the performances of multiple modelling of hybrid pre-amplifiers of l0Gbps bit rate in a WDM system. The hybrid amplifier is designed by having two different cascading methods. The performances in term of output power, gain, noise figure, quality factor and bit error rates were analyzed by using Opti system 7.0software. The goal of this work is to obtain the best performances of hybrid amplifier and have better performances compared to the EDFA and SOA. In hybrid amplifier design, the pump laser power of 9m length of EDFA is varied from l00mW to l000mW for both 980nm and 1480nm wavelengths. The injection current of SOA is constant at 1A. In a nutshell, the (EDFA+SOA) at 980nm wavelength was proposed to be the best model of amplifier in a WDM system.