Time delay compensation device and method for passive optical network and passive optical network

Abstract

The embodiment of the invention discloses a time delay compensation device and method for a passive optical network and a passive optical network. The time delay compensation device comprises a first device arranged on an OLT (Optical Line Terminal) side and a second device arranged on an ODN (Optical Distribution Network) side, wherein the first device comprises a probe light transmitting unit and a time delay processing unit; the probe light transmitting unit is used for transmitting a probe light signal to a master trunk optical fiber or a slave trunk optical fiber; the second device comprises a splitter and a reflection device; a first branch end of the splitter is coupled with the master trunk optical fiber; a second branch end of the splitter is coupled with the slave trunk optical fiber; a common port of the splitter is coupled with a common port of an ODN through the reflection device; and the time delay processing unit is used for acquiring information of first time at which a first optical signal arrives at an OLT and information of second time at which a second optical signal arrives at the OLT, and performing time delay compensation on data transmission of the OLT. Through adoption of the time delay compensation device and method and the passive optical network, the transmission time delays of the master trunk optical fiber and the slave trunk optical fiber can be compensated in real time in order to meet the transmission time delay requirement of front-end retransmission on a PON (Passive Optical Network).

Description

technical field [0001] The invention relates to the field of optical fiber communication, in particular to a time delay compensation device and method of a passive optical network and a passive optical network. Background technique [0002] Among various broadband access technologies, PON (Passive Optical Network, Passive Optical Network) has become a strong competitor of the next-generation broadband access network due to its advantages of large capacity, long transmission distance, low cost, and full service support. [0003] figure 1 It is a common structure of the existing PON, including OLT (optical line terminal, optical line terminal) at the central office, ODN (optical distribution network, optical distribution network) and ONU (optical network unit, optical network unit) at the user end. The so-called passive means that the ODN does not contain any active electronic devices and electronic power sources, and is entirely composed of passive devices such as optical sp...

AI Technical Summary

Problems solved by technology

However, in the actual network deployment process, the main trunk fiber and the backup trunk fiber pass through different pipes, and the layout of the pipes is limited by the city's roads and planning, often resulting in a length difference of more than 6 meters between the main path and the backup path. It is difficult to meet the transmission delay requirements of front-end backhaul for PON

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