US 9,806,807 B1 · Automatic rogue ONU detection

Abstract

Methods, systems, and apparatus for automatically identifying rogue Optical Network Unit (ONU) are disclosed. In one aspect, an Optical Line Terminal (OLT) determines dark power on a fiber optic link over a period of time. For a given ONU, the OLT determines an optical power of high signals and an optical power of low signals received over the fiber optic link during a timeslot assigned to the given ONU, determines a modified optical power of the high signals and a modified optical power of the low signals based on differences between the optical power of the respective signals and the dark power, determines an extinction ratio based on a ratio of the modified optical power of the high signals relative to the modified optical power of the low signals, and identifies the given ONU as a rogue ONU when the extinction ratio is outside of a specified range.

Claims21

Dependent claims

A system, comprising:

a plurality of optical network units (ONUs) connected to a fiber optic link;
and
an optical line terminal (OLT) connected to the fiber optic link, wherein the OLT comprises a rogue monitor, including one or more processes that:
determine dark power on the fiber optic link over a period of time;
and
for a given ONU among the plurality of ONUs:
determine an optical power of high signals and an optical power of low signals received over the fiber optic link during a timeslot assigned to the given ONU;
determine a modified optical power of the high signals based on a difference between the optical power of the high signals and the dark power;
determine a modified optical power of the low signals based on a difference between the optical power of the low signals and the dark power;
determine an extinction ratio based on a ratio of the modified optical power of the high signals relative to the modified optical power of the low signals;
and
identify the given ONU as a rogue ONU when the extinction ratio is outside of a specified range.

9 more elements

A telecommunications device comprising:

a transceiver configured to communicate over a fiber optic link;
and
a rogue monitor, including one or more processes that:
determine dark power on the fiber optic link over a period of time;
and
for a given optical network unit (ONU) connected to the fiber optic link:
determine an optical power of high signals and an optical power of low signals received over the fiber optic link during a timeslot assigned to the given ONU;
determine a modified optical power of the high signals based on a difference between the optical power of the high signals and the dark power;
determine a modified optical power of the low signals based on a difference between the optical power of the low signals and the dark power;
determine an extinction ratio based on a ratio of the modified optical power of the high signals relative to the modified optical power of the low signals;
and
identify the given ONU as a rogue ONU when the extinction ratio is outside of a specified range.

9 more elements

A method, comprising:

determining dark power on a fiber optic link over a period of time;
and
for a given optical network unit (ONU) connected to the fiber optic link:
determining an optical power of high signals and an optical power of low signals received over the fiber optic link during a timeslot assigned to the given ONU;
determining a modified optical power of the high signals based on a difference between the optical power of the high signals and the dark power;
determining a modified optical power of the low signals based on a difference between the optical power of the low signals and the dark power;
determining an extinction ratio based on a ratio of the modified optical power of the high signals relative to the modified optical power of the low signals;
and
identifying the given ONU as a rogue ONU when the extinction ratio is outside of a specified range.

6 more elements

Dependencies are inferred from the claim text.

Automatic rogue ONU detection

Life of this patent

Automatic rogue ONU detection

Life of this patent

Abstract

Claims21