Modelling PM-BPSK Signals for Coherent Optical Transmission over Single-Mode Fiber

Fiber optics has long been a successful mode of telecommunication due to its high transmission speed with very low losses compared to electrical cables. Using light to transmit data is much more efficient than electrical signals. Light polarized at a particular angle travels faster, this polarized light can then be modulated with the required data that needs to be transmitted using various modulation schemes. This report deals with the modeling of such a fiber optic network in Optiwave and studying the effects of transmission at high data rates on a single mode fiber. Using Optiwave a BPSK Signal has been modulated onto the carrier laser beam using Mach-Zehnder Interferometer modeled as a modulator. The Bit Error rate Q factor and Eye diagram has been analyzed for the best signal quality in three different cases of no polarization, linear polarization and circular polarization. The eye diagram provides details on best time to sample the signal, Signal to Noise Ratio and the transmission capacity of the system.