Passive optical network system and transmission method and equipment thereof

Abstract

The invention discloses a passive optical network (PON) system. A plurality of downlink signals with tight spacing and different wavelength are expanded in the OLT downlink direction through a DWDM expansion technology; a plurality of the downlink signals are coupled to form a path of signals and are transmitted; a wave division de-multiplexing device is added to ODN; a coupling signal is divided into a plurality of downlink signals with different wavelengths; and the downlink signals are input to an ONU, thereby expanding the downlink bandwidth of the PON system. The invention simultaneously discloses a signal transmission method for the passive optical network (PON), an optical line terminal (OLT) and an optical distribution network (ODN). The PON system and the suitable signal transmission method, the OLT and the ODN only need to add a new passive device to the LOT and the ODN, upgrade software and can expand the downlink bandwidth of the network without changing the prior optical fiber network or replacing the prior equipment of a user, thereby saving equipment cost and engineering expense for capacity expansion of the network.

Description

technical field [0001] The invention relates to optical network technology, in particular to a passive optical network system and its signal transmission method, as well as an optical line terminal and an optical distribution network applicable to the passive optical network system. Background technique [0002] At present, as the pace of "fiber into copper retreat" is accelerated, optical fiber will light up the "last mile" of the network, and the integration of three networks will also start first in the access network. At present, various passive optical network (PON) technologies based on the time division multiplexing (TDM) mode, especially the Ethernet passive optical network (EPON) technology have begun to be widely used in the access network. [0003] PON technology is a point-to-multipoint optical fiber transmission and access technology. It consists of an optical fiber line terminal (ONU), an optical distribution network (ODN) and an optical network unit (ONU). It ...

AI Technical Summary

Problems solved by technology

The network bandwidth is directly upgraded from 1Gbps to 10Gbps, and the bandwidth is increased by 10 times. The uplink bandwidth is likely to exceed the business demand, resulting in a waste of network investment.

Therefore, at a rate of 1Gbps, simply relying on increasing the rate to expand the bandwidth is not an optimal solution.

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