Hybrid Optical Amplifier Performance in OAF Using OOK and BPSK Modulations

Abstract

FSO (free space optics) is the leading optical communication technology in which data is transmitted by propagation of light in free space. FSO has vast attraction due its high bandwidth, cost-effectiveness, high data rate, transmitting over long distance etc. Relay nodes in FSO system leads to increase the transmission distance and it also helps to reduce the effects of atmospheric turbulence in FSO system. All-optical amplify and forward (OAF) relaying technique helps to amplify and forward the signal. However, EDFA optical amplifier in OAF causes Amplified Spontaneous Emission (ASE) noise, degradation of the system’s Bit Error Ratio (BER) and the value of Optical Signal to Noise Ratio (OSNR) are also dropped. In this paper, we used EDFA and RAMAN serially as Hybrid Optical Amplifier (HOA) in OAF relay node to meet the deployment challenges of existing system. By focusing BER and SNR parameter, we derived the performance of hybrid optical amplifier in OAF relay node using OOK and BPSK modulations.