Position:Researching a field, the group of Professor Zhang research of college of industry of American Qiao Zhiya grain made much research to system of ROF of 40G/60G radio frequency, and build gave an optical wireless transmission system, the modulation of source of data of high-definition clear TV that stores DVD arrives on the microwave of 40G, pass modulation to be transmitted to smooth carrier wave next, be received through exploring and blast off by aerial, send high-definition clear TV to undertake broadcasting signal in sink, get very good test result. But, the distance of emissive antenna and receving antenna is very close and the interference that suffers vapor easily.
Not long ago, OFC 2008 conference is held successfully in American California Santiago, network confluence becomes topic of a heat, about the article of ROF technology also a lot of is collect among them, with differ before, the ROF paper that collects this the research that incline to uses at correspondence. The article that compares a pattern among them has: orthogonal frequency cent answer is used (OFDM) applies at ROF system, will raise spectrum utilization rate and reduce the interference between the code; Research is in go up technology of recycle of transmission days wavelengh, thereby the illuminant that take out radical stands; Be based on WiMAX or WiFi and the research that ROF technology combines; Be based on light bifurcate answer is used implement (the ROF system of OADMs) is annular the research of the network; Be based on much model fiber-optic with plastic and fiber-optic ROF system.
3. ROF technology applies mediumly in network confluence
In mobile, rich transmission bandwidth, enclothe the advantage such as limits, high capacity, low power comsumption to all make ROF system light wireless without what seam there is larger development space in network confluence. Additional, it has transparency to the modulation format of signal, it provides the vehicle that a physics transmits only, can see it into aerial the center controls the transparent link that the site selects between the bureau. Pass it and the confluence that have a network, can reach concentration control, share the capacity of network of costly parts of an apparatus, trends allocation, goal that reduces cost. ROF and the shirt-sleeve successful case that have many different networks introduce below.
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