Method and apparatus for acquiring optical power, and optical line terminal

Abstract

The invention discloses a method for acquiring optical power, a device and OLT thereof, belonging to the optical network field. The method comprises the following steps: receiving uplink signals from at least two optical network units; determining whether the optical power of the optical network unit is required or not according to the identification information or uploading time of the optical network unit in uplink signals; if so, the optical power of the optical network unit is acquired. The device comprises a receiving module, a judging module and an acquiring module. The OLT comprises ADC, a memory and a medium access control unit, wherein the medium access control unit is connected with the memory or connected with the ADC. By adopting the invention, the optical power of the ONU can be accurately acquired so that the cost is saved, and the acquisition can be realized at any time without interrupting normal services; the system has the advantages of easy expansion, good maintainability and lower maintenance cost; the optical power can be selectively acquired, the system can control start time and finish time of acquisition, thereby greatly improving the rate of accuracy.

Description

technical field [0001] The invention relates to the field of optical networks, in particular to a method, device and optical line terminal for obtaining optical power. Background technique [0002] PON (Passive Optical Network, Passive Optical Network) technology is a point-to-multipoint optical fiber access technology. see figure 1 , PON has a tree topology, which consists of ODN (Optical Distribution Network, Optical Distribution Network), OLT (Optical Line Terminal, Optical Line Terminal) on the office side, and ONU (Optical Network Unit, Optical Network Unit) or ONT on the user side (Optical Network Terminal, Optical Network Terminal). The so-called "passive" means that the ODN does not contain any active electronic devices and electronic power supplies, and is all composed of passive devices, such as optical splitters (Splitter), so the management and maintenance costs of PON are relatively low. [0003] In the GPON (Gigabit Passive Optical Network) system, the trans...

AI Technical Summary

Problems solved by technology

In the process of realizing the present invention, the inventor found that the prior art has at least the following disadvantages: manual operation is required, which increases labor costs; normal business needs to be interrupted during measurement, and real-time measurement cannot be performed

In the process of realizing the present invention, the inventor found that the prior art 2 has at least the following disadvantages: it is impossible to determine the optical power value of which ONU is currently being measured, and it is also impossible to selectively measure the optical power of the required ONU

In the process of realizing the present invention, the inventor found that the prior art 3 has at least the following disadvantages: the estimated arrival time of the ONU signal to be tested needs to be written into the counter inside the conversion initialization module in advance, and the counter triggers the analog / digital conversion according to the time Due to system errors and link delays, the signal arriving when the counter finishes counting may not be the ONU optical signal to be measured, which will cause measurement errors

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