Over the years, it’s agreed that the PON access network is the future development direction. There are two reasons for this condition. First, it provides the bandwidth to meet present and future needs of a variety of broadband services, so it have a good Lacoste Polo Shirts performance in solving the problem of broadband access. Second, it cost low both in equipment operation and maintenance relatively. Distributed optic-fiber sensing (DOFS) system is a kind of distributed discount wedding dresses sensing system using optic-fiber as the sensing medium, and carries on real-time remote security monitoring of the target within it.A new scheme for passive optical access network (lace wedding dresses ) was proposed, which can provide security service and self-locate physical faults. This system not only has the features of electromagnetic immunity, anti-eroding and sensitivity, but also takes advantages of hardly being revealed, precise alarm locating, easily data processing and so on. As a lace wedding dresses novel alarm cheap wedding gown dresses monitoring system, such a distributed sensing system is anticipated to be used widely in safety monitoring of military bases, national boarders, nuclear facilities, cheap evening dresses electrical power generation stations, jails, et al.This thesis introduces a lot of innovational theoretical and experimental work about the PON fiber access network system with function of security service. Detailed work is listed below:(1) The principles and application of optical fiber communication access network systems are analyzed, and the existing methods of PON are investigated and compared.
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