Downlink energy-saving transmission system of OFDM passive optical network

Abstract

The invention provides a downlink energy-saving transmission system of an OFDM (Orthogonal Frequency Division Multiplexing) PON (Passive Optical Network). The downlink energy-saving transmission system comprises an optical line terminal, a feeder line type optical fiber and a PON system, wherein the PON system comprises a remote node, a distributed optical fiber and optical network units, the optical line terminal is connected to the remote node through the feeder line type optical fiber, and the remote node is connected to each optical network unit through the distributed optical fiber. According to the downlink energy-saving transmission system provided by the invention, a timer module is added in a traditional optical network unit for controlling the switch-off time of an ADC (Analog to Digital Converter), and a selective sampling function of the ADC in each optical network unit can be directly realized in a physical layer under the scheduling and the managing without media access control; meanwhile, other follow-up digital signal processing modules can also be switched off during a switch-off process of the ADCs, and the power consumption of each optical network unit can be further reduced.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a downlink energy-saving transmission system of an OFDM passive optical network. Background technique [0002] With the emergence of ultra-bandwidth services, big data services, and long-distance access in the access network, the traditional time division multiplexing TimeDivisionMultiple, TDM passive optical network can no longer meet the needs of the current stage. Orthogonal Frequency Division Multiplexing, OFDM has high spectral efficiency, anti-dispersion and polarization mode dispersion, etc. It is considered to be a very potential technology in the next generation optical access network. Using multiple orthogonal sub-carriers to transmit user data can obtain flexible dynamic bandwidth allocation at sub-wavelength granularity; combined with traditional time-division multiplexing technology, its bandwidth allocation can be more flexible; high-speed digital sign...

AI Technical Summary

Problems solved by technology

But in all these methods, the receiver in each ONU must receive all downlink broadcast data, and each broadcast data frame needs to be processed; and in all data after processing, only a small amount of data is useful to the ONU, Cause the use efficiency of ONU receiver is relatively low

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