OFDM (Orthogonal Frequency Division Multiplexing)-based convergence type OAN (Optical Access Network) system and method

Abstract

The invention provides OFDM (Orthogonal Frequency Division Multiplexing)-based convergence type OAN (Optical Access Network) system and method. The method comprises the following steps of: generating basic optical carriers by a laser contained in a mode optical line terminal; generating millimeter wave optical carriers and baseband optical carriers by applying a radio-frequency modulation module and an optical inter-difference filter, then, respectively loading OFDM signals, synthesizing and outputting the OFDM signals by utilizing a coupler and transmitting to an optical network unit through an optical distribution network; and separating millimeter wave contents from the received signals by the optical network unit, converting into electric signals, transmitting the electric signals through an antenna group, carrying out the photoelectric conversion, the digital-analog conversion and the treatment to the rest signals and further transmitting to the next unit to realize the convergence access of the wireless signals. The model and the method of the invention are adopted to realize the convergence access of cable signals and wireless signals in the OAN, realize the access in various modes such as baseband OFDM signals, UWB (MB-OFDM) (Ultra Wideband) (Multi-Band-Orthogonal Frequency Division Multiplexing) signals, WiMax / WiFi (Worldwide Interoperability for Microwave Access / Wireless Fidelity) signals and millimeter wave OFDM signals in the same scene and improve the generalization of the access network.

Description

technical field [0001] The invention designs communication technology, and in particular relates to a convergent optical access network system and method based on orthogonal frequency division multiplexing. Background technique [0002] With the development of science and technology, human society is entering an information age. More and more information data needs to be disseminated through the network, and various high-traffic applications have emerged, such as IPTV, VoIP, video conferencing, and so on. People's demand for information transmission bandwidth has been increasing at an alarming rate. However, for the access network, it still stays at the megabit-level transmission rate, neither in terms of bandwidth nor flexibility, can meet the rapid development of network traffic and the diverse needs of users today, and has become a high-speed backbone network and local network. a bottleneck in . In the future, broadband access to optical networks must not only provide ...

AI Technical Summary

Problems solved by technology

The fly in the ointment of WDM-PON is that the cost is relatively high, so there is still a distance from practicality

However, when the two systems need to be applied on the same line, two systems must be established to transmit optically-carried millimeter wave and optical OFDM format data respectively, which not only increases the complexity of comprehensive system management, but also increases the fiber laying and equipment space. other capital costs

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