The Book cover the research efforts made in the field of Passive Optical Access Networks in the recent years.Theory and principles of the related fields are presented with comprehension. Different Network Architectures of Downstream and upstream for achieving colorless transmission in passive optical access networks are included. Performance of Passive Optical Networks are analyzed through simulation and experimental work. The Design issues of Transmitters and Receivers are addressed with detailed analysis .The analysis parameters mainly include data rate, launch power, transmission distance, Bet Error Rate and Signal to Noise Ratio. impact of Non linear factors like Rayleigh backscattering on the transmission performance is also presented. Power Budgeting issues of various scheme are also included in analysis part. The Results are presented pictorially with powerful tool of ORIGIN.The Conclusions are drawn and presented in effective way.