Research For RoF And WDM-PON Integration System

With the rapid development of interactive multimedia, A variety of new multimediaservices makes it appear dramatic increase in bandwidth requirements for either wired orwireless. However, due to restricted access network technology, communication networks cannot be like the Internet towards broadband and full-service transition. In order to satisfypeople’s needs for communication networks like the Internet as quickly and easily transferdata, voice, image, video and other multimedia services. RoF is one of the key technologies ofthe future access network. it combines large transmission bandwidth wireless network withhighly flexible fiber,and provides transparent business transfer, WDM-PON has Exclusivewavelength band, And excellent carrying capacity.the whole business has been widely used inthe optical access network. Therefore, Integrating the RoF and WDM-PON these twotechnologies has great research value and practical value.At the present stage, Integrating of RoF and WDM-PON these two technologies isfocused on two aspects. one is how to use the smallest possible system complexity and systemconstruction costs.using multicarrier to transmiss wired and wireless signals simultaneously.That is multi-service transmission.the other one is How to adjust the number and capacity ofthe cell in order to obtain the maximum channel capacity and high spectral efficiency at RBSof the intergrated system.This thesis presents RoF and WDM-PON integration systemsscheme of multi-service transmission, and analyzes the relationship between channel capacityand cells of RoF-DAS and the WDM-PON integration system. The details are as follows:Firstly, presenting a multi-service integration system approach to wireless signal and cablesignal transmission simultaneously. At the central station (CS) for the cable signal modulatedusing PM. The wireless signal is modulated by intensity modulation. And using a carrier reusemethod on the re-modulation the uplink signal. Using optical simulation software for theconstructed system simulation, simulation and analysis of the downstream cable to get thesignal, the light spectrum radio signals and uplink signals eye diagram and the Q factor,obtained by analysis of simulation results in downstream transmission, the client can beaccurately accepted. Meanwhile, after reuse of the uplink carrier modulated baseband signal isthen transmitted to the OLT after the accuracy can also be accepted. Verify that thetransmission performance of the system, the validity and reliability.Second, This paper evaluated the channel capacity of RoF-DAS and WDM-PONIntegrated system. We confirm the best cell size to achieve maximum channel capacity whenconsidering the loss of RoF system.And the loss of the case under consideration RoF systemto determine the optimal cell size to achieve maximum channel capacity when. RoFtransmission signal to noise ratio that is used to examine the RoF-DAS and the downstream channel capacity WDM-PON fusion system, and illustrates the derivation of optimal cell sizein order to maximize the capacity of the radio channel. We found that when RoF achieve highsignal to noise ratio, the smaller cell size allows each cell and each mobile terminal channelcapacity increases.