Method and device for detecting optical power of passive optical network (PON) and PON system

Abstract

The embodiment of the invention discloses a device for detecting optical power of a passive optical network (PON). The device comprises a receiving module, a detection module and a controller, wherein the receiving module is used for receiving optical signals sent by an optical network unit (ONU); the detection module comprises a current mirror received signal strength indication (RSSI) detection branch and a logarithmic amplifier RSSI detection branch; the current mirror RSSI detection branch and the logarithmic amplifier RSSI detection branch are respectively coupled with the receiving module and used for carrying out RSSI measurement on the optical signals received by the receiving module in accordance with received RSSI function trigger signals; and the controller is coupled with the detection module and used for outputting the RSSI function trigger signals to the detection module, selectively receiving RSSI measurement results which are output by the RSSI detection branch and correspond to the luminous intensity of the optical signals sent by the ONU according to the selection control signals provided by a selection control signal generating module, and calculating the optical power information of the optical signals in accordance with the RSSI measurement results. The embodiment of the invention also discloses a method for detecting optical power of a PON and a PON system.

Description

technical field [0001] The present invention mainly relates to passive optical network technology, in particular to a method, system and device for detecting optical power of a passive optical network. Background technique [0002] As "optical access copper retreat" has gradually become the mainstream access method of network technology, the application of optical access technology has been vigorously developed. A passive optical network (Passive Optical Network, PON) technology is a point-to-multipoint (Point to Multi Point, P2MP) based optical access technology. The passive optical network system mainly includes an optical line terminal (Optical Line Terminal, OLT) located in the central office, a plurality of optical network units (Optical Network Unit, ONU) located on the user side, and a distribution or multiplexing optical line terminal and optical network Optical distribution network for data signals between units. Wherein, the direction from the OLT to the ONU is d...

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Problems solved by technology

[0004] However, due to the limited optical power measurement accuracy of existing optical modules, there may be a certain deviation between the received optical power value P2 of the optical network unit obtained through optical power detection and the actual received optical power value, which may cause There is a large error between the insertion loss value A calculated by the optical line terminal and the actual insertion loss value of the system, which in turn causes the optical line terminal to make a wrong judgment on the fault status of the optical distribution network

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