Key Technological Issues In Implementation Of Passive Optical Access Networks

Due to contemporary development of broadband applications, it is a continuous pursuit to develop broadband access networks in the existing telecommunication access networks. This pursuit transformed the conventional access networks to optical fiber access networks. However it is envisaged that the increasing demand of broadband access will soon saturate the capacity of current access networks. The demand for the broadband access is raising day by day, a study to discover technologies enabling wider bandwidth for access system, is extremely important. Wavelength Division Multiplexing Passive Optical Access Network (WDM-PON) is being utilized in optical access systems, however we need to find more promising techniques that not only provide better performances but should also be cost effective. To cope with this, Passive Optical Access Network has been found to be the solution of broadband problem and next generation access networks.The research is conducted to deal with the problem of finding cost-effective solutions for the implementation of Passive Optical Access network. In our dissertation we covers the concept by highlighting the driving factors such as; transmitter design consideration, network architectures and power link budgeting to get the desired goals in WDM-PONs. Theoretical discussions have been succeeded by simulation and experimental demonstrations. The results are analyzed and appraised to view outcomes pictorially.Reducing transmitter cost is the most crucial issue in the deployment of passive optical access networks. The network architecture with centralized light source at optical line terminal (OLT) and with data re-modulation at optical network unit (ONU) is an attractive solution to achieve cost-effective deployment. In meticulous to our research, the architecture design and techniques of generation for downstream and upstream signals are considered to develop an optimized transmission scheme in WDM-PONs.The most widely network architecture used in WDM-PON is base on dual feeder fiber, but the architecture is associated with high deployment cost. Our research tries to address the issue by using single feeder fiber architecture which alleviates deployment cost significantly. However there are several affects that cause performance degradation of the system by using single feeder fiber architecture which have been discussed analytically and remedies has been suggested accordingly. One factor degrading the system performance is the impairment of Rayleigh backscattering, that interfere the signal and causes cross talk penalty. The study reveal that despite using different techniques Rayleigh backscattering cross talk cannot be totally eliminated, however several techniques can mitigate the this effect.