Optical line terminal, passive optical network and radio frequency signal transmission method

Abstract

The invention provides an optical line terminal, a passive optical network and a radio frequency signal transmission method, and pertains to the technical field of communication. The passive optical networks comprises an OLT, an ODN and at least one ONU, wherein, the OLT comprises at least one transmission unit which provides a downstream optical carrier and two upstream optical carriers dedicated to the ONU, modulates a downstream radio frequency signal to be sent to the ONU to a downstream optical carrier dedicated to the ONU, and outputs a downstream optical signal after mixing the modulated upstream optical carrier and the corresponding two dedicated upstream optical carriers, wherein, the two upstream optical carriers dedicated to the ONU is used for carrying the upstream radio frequency signal of the ONU; a multiplexing / demultiplexing unit which is used for transmitting the downstream optical signals output by various transmission units to the ONU by the ODN after the wavelength division multiplexing, and demultiplexing and outputting the upstream optical wavelength division of various ONUs which are subject to the wavelength division multiplexing; and at least one receiving unit which is used for obtaining an upstream signal from the demultiplexed upstream optical signal. The bandwidth of a radio access network is enlarged, and the ONU has simple design.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to an optical line terminal, a passive optical network and a radio frequency signal transmission method. Background technique [0002] PON (Passive Optical Network, Passive Optical Network) is a point-to-multipoint tree network structure. Because PON has the characteristics of simple network structure, sharing of optical fiber resources, low cost, and no need to install external active equipment, it is recognized as the most promising optical fiber access technology. [0003] Currently, in a PON-based network, the transmission method of an RF (Radio Frequency, radio frequency) signal is: [0004] The central office and multiple BSs (Base stations, base stations) use the same pair of optical carriers to transmit RF signals, that is to say, in the downlink direction, the central office will need to send RF signals of different frequencies to multiple BSs to The subcarr...

AI Technical Summary

Problems solved by technology

[0007] In the above RF signal transmission process, the optical fiber is only used as a carrier to transparently transmit the RF signal. Therefore, it is useless to make full use of the large-capacity bandwidth resources of the optical fiber network, resulting in low bandwidth of the wireless access network.

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