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Research On RoF-WDM-PON System Based On Generating Structure Of Muti-Carrier Light Source

Posted on:2020-05-27Degree:MasterType:Thesis
Country:ChinaCandidate:J W ZhengFull Text:PDF
GTID:2428330596994992Subject:Information and Communication Engineering
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With the arrival of the data era,in order to meet the changing needs of users for data services,telecommunication services must gradually change to integration,digitalization,intelligence,broadband and personalization.Meanwhile,the increasing maturity and application of the synchronous digital system,the passive optical network and the wavelength division multiplexing technology enable the integration of telecommunication network,radio and television network and Internet.It has been a topic of close attention and research by the telecom experts and operators how to increase service types and improve service quality and communication network flexibility.The radio over fiber technology is a communication technology that integrates the advantages of large transmission bandwidth,low loss,strong anti-electromagnetic interference capability in the optical fiber communication and the flexibility in wireless communication access.The wavelength division multiplexing passive optical network technology is characterized by long transmission distance,high-efficiency,large-bandwidth,good security and so on.The combination of the optical wireless technology and the wavelength division multiplexing passive optical network can meet the people's requirements for the network transmission capacity,multi-service requirements,access flexibility and so on.And this technological combination will become a highly promising solution for the “last mile” problem of communication.This thesis,in accordance with the RoF technology,PON technology and the WDM-PON technology,mainly performs the following discussions:The basic principles and characteristics of microwave photonics,RoF technology and PON technology briefly are introduced,the basic structure and key technologies of the WDM-PON system are analyzed,we compare the technological characteristics of the three ways of realizing colorless ONU,and summarize the technological advantages of the WDM-PON system over the traditional TDM-PON system.We propose a multi-carrier light source generator structure based on external modulator,verifie the feasibility of this structure through simulation,an ultra-wideband flat multi-carrier light source is generated,we obtain a multi-carrier light source with flatness ofless than 0.9dB and a spectrum width of higher than THz,and analyse the frequency interval adjustability of the multi-carrier light source generated by the system and the influential factors of the number and the flatness of the subcarriers of multi-carrier light sources.And this structure is applied to the WDM-PON system,which solves the problems of the large number,difficulty to coordinate and inconvenience in equipment maintenance and management of the light sources used in the traditional wavelength division multiplexing system.We propose a bidirectional RoF-WDM-PON transmission system based on polarization multiplexing to realize the colorless ONU with the polarization multiplexing technology,which simplifies the system structure of RoF-WDM-PON.The uplink and downlink signals are modulated by NRZ-OOK modulation signal.The downlink wireless signal realizes the high-frequency wireless signal transmission of the RoF system based on the basic coherent detection principle,and the uplink signal uses the direct detection technology to realize the long-distance transmission of the baseband signal with low error rate,and performs simulation experiments using the optical simulation software Optisystem to analyze the spectrum of the downlink signal,the uplink signal,the eye diagram and the variation of the Q factor.The simulation results show that the uplink and downlink signals can be transmitted stably and the system has good transmission performance.
Keywords/Search Tags:Optical communication, Wavelength Division Multiplexing, Radio-over-fiber technology, Passive Optical Network, Multi-carrier light source
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