Optical fiber Raman amplifier (OFRA) with wide and flat gain bandwidth has been widely applied in the fields of optical communication, sensing and measurement. However, the performance optimization is always one of the hot topics in the study of OFRA, because its output characteristics are hardly dependent to some key designing parameters. In this paper, to overcome the problems above, we adopt a spectrum analysis based method to study the output performance of an OFRA system with backward pumping. By simulating the operation of the OFRA system, its output characteristics are first showed easily, with the advantages of real time, low cost, and low complexity. Further, according to the numerical results obtained, the optimal parameters of an OFRA system are determinate, and the performance in terms of output power, signal noise ratio, and the level of gain flatness is improved and optimized obviously.
The erbium doped fiber amplifier (EDFA) is one of the most important devices in the present optical communication and measurement system. However, the problem on parameters optimization of EDFA is always an open issue. Aim to obtain the output characteristics quickly and flexibly, in this article, we model the operation of an EDFA system by simulation. The numerical results show that the output spectrum of EDFA with various parameters. And through analyzing the performance in terms of gain, flatness and noise, the optimal pumping power and the length of EDF are determinate.
It is difficult to study the characteristics of high speed optical communication system due to the complexity and high-cost in configuration. In this paper, aiming to overcome the weakness above, the performance of a 10Gbps optical communication system with single channel is investigated by simulation. Then, based on the outputs of RZ and NRZ codes modulated, an extensive comparison is developed in terms of spectrums, noises, eye diagrams and bit error rate.
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