Online optical network unit (ONU) optical power acquisition device and method

Abstract

The invention discloses an online optical network unit (ONU) optical power acquisition device and an online ONU optical power acquisition method; the device includes that: a control signal wire is arranged between an OLT MAC control module and an OLT side optical module; the method comprises that in the operation process of an EPON system, the OLT MAC control module controls the OLT side optical module to measure the optical power of the ONU in the time slot distributed to each ONU by the OLT through the control signal wire. The online ONU optical power acquisition device and the method can measure the accurate optical power of any ONU in the EPON system in an online way, and facilitate the diagnosis and maintenance of optical network.

Description

technical field [0001] The invention relates to an optical power detection technology in an Ethernet Passive Optical Networks (EPON) system, in particular to a device and method for online acquisition of optical power of an Optical Network Unit (ONU). Background technique [0002] The schematic diagram of the composition structure of the existing EPON system is as follows: figure 1 As shown, the system is a single-fiber bidirectional system, which is composed of an optical cable central office equipment (Optical Line Terminal, OLT) at the office side, an ONU at the user side, and an optical distribution network (Optical Distribution Network, ODN). In the downstream direction, the signal sent by the OLT reaches each ONU through the ODN; in the upstream direction, the signal sent by each ONU can only reach the OLT through the ODN, but not other ONUs. The EPON system uses passive optical splitters in this single-point to multi-point architecture without any active equipment. T...

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Problems solved by technology

[0004] In the EPON system, the upstream optical signal is in burst mode, which is different from ordinary continuous optical signals. The traditional method of obtaining optical power is to measure the average optical power in the sampling period. Due to the type of optical module used by the ONU and the Due to the influence of factors such as the optical path distance from the OLT, the existing method for measuring the average optical power cannot measure the correct optical power of any ONU in the EPON system, that is, the measured optical power of the existing optical power measurement method The average optical power cannot truly reflect the actual optical power of each ONU, which brings great difficulties to the diagnosis and maintenance of the optical network

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