Alarm System for an Optical Network

摘要

A method is provided for detecting intrusion into optical fibers of a Passive Optical Network (PON) of the type which includes a multiplexing system at the head end for separating a data signal output at the head end to the plurality of fibers for supply to user end terminals and a data transmission system at each of the user end terminals for entering onto the fiber data as an optical signal. The method includes providing a monitor system having a transmitter at the head end and a monitor signal analysis system for analyzing changes in the optical monitor signal after transmission along the fiber for detecting an intrusion event. A monitor signal analysis system is provided at one or more user end terminals for detection and conversion of data from the analysis into a digital signal which is then transmitted from the user end terminals back to the head end using the data transmission system through the PON system or separately from the PON system.

主权项

1. A method for detecting intrusion into at least one optical fiber of an optical fiber cable of an Optical Network where the network comprises:
a plurality of fibers each having a first end and a second end; the second end of at least some of the fibers being connected to respective ones of a plurality of user end terminals; a multiplexing system for separating a data signal output to the plurality of fibers for supply to the user end terminals; a data transmission system at each of the user end terminals for transmitting data as an optical signal; the method comprising: providing a monitor system having a transmitter for a monitor signal to be applied onto at least one of the plurality of fibers, the monitor system having a monitor signal analysis system for analyzing changes in the optical monitor signal after transmission along the fiber or fibers for detecting an intrusion event; providing at at least one of said end user terminals a monitor signal receiver system for detection and conversion of data from the analysis into a digital signal; and transmitting the digital signal from said at least one of the user end terminals back to the monitor system using the data transmission system.