Abstract
In this paper, a system for communication of four channels at the rate of 80 Gbps has been studied using semiconductor optical amplifier (SOA) as an inline amplifier. For linearisation of SOA, the feed-forward linearisation method, as proposed by Tabatabai & Al Raweshidy (2007) has been employed. It is verified that the technique gives a significant drop in the IMD3 (intermodulation third order product) distortion up to 20 db even for four channels at 80 Gbps. However such high data rate may limit the system performance, namely quality (Q) factor, bit error rate and link length. To cover these significant factors we have employed the feedforward linearisation method and this has shown improvement in the system performance. Using simulation, it is validated that the system has been successfully tested for carrying four 80 Gbps channels over 120 km. With linearisation, the Q factor achieved, at 80 Gbps with fibre length 120 km, is 6. The simulation work has been carried out with the OptiSystem 9 Simulation platform. SOA is highly non-linear amplifier, to lineariser that we need feed-forward method of linearisation. This technique should be applicable to millimetre or any microwave frequency band.
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