Evaluation of Low diversity Coding Schemes in Optical Communication

In optical communication system, as the link length increases signal gets more and more distorted. So, it becomes difficult to stimulate the signal. Adaptive filter is a recursive filter, which provides an estimate with minimum mean square.Measurements of the bit error rate at various signal to noise ratios and also at different number of samples in a bit are observed,which represents that an increase in signal to noise ratio or the number of samples in a bit, causes the bit error rate to decrease. Estimation of optical signal using adaptive filter reduces the BER effectively.In a fiber-optic system at long distances or high data rates, the system can be limited either by the losses (attenuation-limited transmission) or, assuming that thelink is not limited by the source or detector speed, by the dispersion of the fiber(dispersion-limited transmission). Here we demonstrate how the optimum link lengthcan be determined in different aspects like Dispersion & attenuation.There are so many techniques in designing the driver circuit for sources. In this thesis, different types of driver circuits with the help of MESFETs, HFETs, BJTs,HBTs & CMOS technologies are discussed.