Abstract

Free space optics(FSO) can be used as an alternative to the currently used wireless Radio communication systems to meet the increasing demands for the uninterrupted internet connection in High-Speed Trains(HSTs). FSO is less prone to interference, license-free and more secure as compared to Radio Frequency (RF) technology. The performance of the FSO system can be measured in terms of the average bit error rate(BER) and quality factor (Q-factor). In this paper, we have compared the NRZ and RZ modulation formats using a dual wavelength model at a bit rate of 10 Gbps to see which modulation format gives better Q-factor. The RZ modulation format is studied for a duty cycle of 33% and 67% and the comparison is made in terms of Q-factor. The system is also studied under different weather conditions in terms of Q-factor.

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