Outgoing light power monitoring method for ONU (Optical Network Unit) optical module

Abstract

The invention discloses an outgoing light power monitoring method for an ONU (Optical Network Unit) optical module. The method comprises the following steps of: judging an outgoing light power monitoring value through the light emitting state of a laser module; assigning the initial monitoring value in MCU (Microprogrammed Control Unit) as 0; and then obtaining a sampling value transmitted from a monitoring circuit; refreshing and storing a new monitoring value if the laser module emits light; and still keeping the previous monitoring value if the laser module does not emit light. Therefore, problems that false report of light power is caused by environment light and the traditional sampling keeping circuit cannot keep light power sampling value for a long time can be solved; and the requirements of engineering application are satisfied with high efficiency at low cost.

Description

technical field [0001] The invention belongs to the technical field of optical communication, and in particular relates to a method for monitoring the optical power of a transmitting end in a burst optical module in an ONU. Background technique [0002] The optical communication network is connected to the access network of the user terminal, and can be divided into AON (Active Optical Network, active optical network) and PON (Passive Optical Network, passive optical network) according to whether active devices are connected. Because PON has the characteristics of easy maintenance, easy installation and expansion, it has been widely used and has become the standard specification of the International Communications Union. PON usually consists of an OLT (Optical Line Terminal, Optical Line Terminal) located at the central office, several ONUs (Optical Network Unit, Optical Network Unit) located at the user end, and an optical distribution network between the two. When the dat...

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Problems solved by technology

[0006] The existing technology generally has the problem that it cannot actually meet the requirements of engineering applications: affected by the ambient light, the PD in the laser component will have a weak dark current even when the LD is not emitting light, resulting in an error when the optical module is not emitting light. Report a weak optical power monitoring value

The capacitor inside the sample-and-hold circuit will slowly discharge over time, and the sampled value cannot be kept all the time, so the optical power monitoring value when the optical module is not emitting light cannot be maintained for a long time as the optical power value of the last light-emitting time

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