Smart Optical Cable Location Using Vibration and OTDR
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Solution Overview
Problem
Current optical fiber installation methods suffer from location accuracy errors of up to 15-20%, making it difficult for technicians to accurately locate faults in optical cables during maintenance, as existing technologies like OTDR provide only length information and not physical location.
Innovation Solution
The implementation of a smart cable location system using distributed optical sensing and a movable mechanical vibration source to stimulate vibrations in the optical fiber, combined with GPS and OTDR distance measurements, allowing for simultaneous determination of cable length and position, which are then paired and mapped for precise location identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional OTDR methods are used to measure fiber cable length, then length information can be obtained, but physical location accuracy deteriorates with 15-20% error
Solution Approach 1:
The patent combines traditional OTDR length measurement with GPS location data and mechanical vibration sources to create an integrated system that provides both distance and physical location information simultaneously, eliminating the 15-20% location error of traditional methods
Solution Approach 2:
A mechanical vibration source is introduced to generate detectable vibrations in the fiber cable at specific locations. The vibration sensor detects these vibrations to determine the exact physical position, providing location accuracy that complements the length measurement data
2Measurement precision
If distributed optical sensing with vibration sources is implemented, then location accuracy improves to 4 meters, but device complexity increases
Solution Approach 1:
The existing optical fiber cable serves dual purposes: as the communication medium and as the sensing element for vibration detection. This eliminates the need for separate sensing infrastructure and reduces overall system complexity despite the enhanced measurement capabilities
Solution Approach 2:
The optical fiber is made multi-functional, serving both as the communication transmission medium and as the vibration sensing element. This universal use of the fiber infrastructure reduces the need for additional dedicated sensing equipment
3Productivity
If simultaneous length and position measurement is implemented, then maintenance efficiency improves, but loss of time for data collection increases
Solution Approach 1:
The system performs preliminary mapping during installation or maintenance windows, collecting and storing the relationship between OTDR distance and GPS location data in advance. This pre-collected data is then readily available for rapid fault location without requiring time-consuming field measurements when faults occur
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly improves the accuracy of fiber fault location, achieving 4-meter precision for buried cables and exact pole-supported aerial cable locations, enhancing maintenance efficiency by enabling quicker and more accurate fault pinpointing.
Implementation Method 1
distributed optical sensing and frequency source(s) to provide both optical cable length and physical position information simultaneously
Implementation Method 2
a movable mechanical vibration source to stimulate tiny vibration of fiber in deployed fiber cable along the cable route
Data Source
AI summary
Aspects of the present disclosure describe systems, methods and structures for determining any location on a deployed fiber cable from an optical time domain reflectometry (OTDR) curve using a movable mechanical vibration source to stimulate tiny vibration of fiber in deployed fiber cable along the cable route and a fiber sensing system at a central office to detect the vibration(s). Latitude and longitude of the location(s) of the vibration source is measured with a GPS device and a dynamic-OTDR distance is measured at central office (CO) simultaneously. The collected GPS location data and corresponding dynamic-OTDR distance data are paired and saved into a database. This saved data may be processed to graphically overlie a map thereby providing exact cable location on the map thereby providing carriers/service providers the ability to improve fiber fault location on a deployed fiber cable much faster and more accurately than presently possible using methods available in the art.