Method for selection of optical fiber and system for inspection of optical fiber
First Claim
1. An optical fiber selecting method for selecting an optical fiber through a use of a waveform of a power of a light beam in the time domain, the light beam being measured by inputting a pulsed light beam to an optical fiber to be selected and detecting the light beam returned from said optical fiber, the method comprising:
- an approximated linear line calculating step of determining an approximated linear line for said waveform;
a deviation waveform calculating step of determining a deviation waveform based on a difference between said waveform and said approximated linear line;
a difference value calculating step of determining a first reference value of the maximum or a local maximum of the deviation and a second reference value of the minimum or a local minimum of the deviation for said deviation waveform, and calculating a value of a difference between the first reference value and the second reference value; and
a selecting step of selecting said optical fiber based on a result of a determination, the result of the determination being obtained by determining whether or not a value of a difference meets a specific condition.
1 Assignment
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Accused Products
Abstract
An optical fiber inspecting system 1A comprises a waveform measuring unit 2 for measuring an OTDR waveform for an optical fiber F to be inspected and a waveform evaluating unit 3 for evaluating an anomaly within the optical fiber. The waveform evaluating unit 3 comprises a calculating part 4 and a detecting part 5. The calculating part 4 calculates the gradient and the amount of change in gradient of the waveform at each time point. The detecting part 5 determines whether or not the gradient and the amount of change in gradient are within a defined allowable range of gradient and a defined allowable range of amount of change, respectively. This realizes an optical fiber inspecting system, an inspection method and a selecting method, all of which enable to detect reliably an anomaly within an optical fiber through an OTDR waveform.
17 Citations
8 Claims
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1. An optical fiber selecting method for selecting an optical fiber through a use of a waveform of a power of a light beam in the time domain, the light beam being measured by inputting a pulsed light beam to an optical fiber to be selected and detecting the light beam returned from said optical fiber, the method comprising:
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an approximated linear line calculating step of determining an approximated linear line for said waveform;
a deviation waveform calculating step of determining a deviation waveform based on a difference between said waveform and said approximated linear line;
a difference value calculating step of determining a first reference value of the maximum or a local maximum of the deviation and a second reference value of the minimum or a local minimum of the deviation for said deviation waveform, and calculating a value of a difference between the first reference value and the second reference value; and
a selecting step of selecting said optical fiber based on a result of a determination, the result of the determination being obtained by determining whether or not a value of a difference meets a specific condition. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An optical fiber inspecting system for inspecting an optical fiber through a use of a waveform of a power of a light beam in the time domain, the light beam being measured by inputting a pulsed light beam to an optical fiber to be inspected and detecting the light beam returned from said optical fiber, the system comprising:
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approximated linear line calculating means for determining an approximated linear line for said waveform;
deviation waveform calculating means for determining a deviation waveform based on a difference between said waveform and said approximated linear line;
difference value calculating means for determining a first reference value of the maximum or a local maximum of the deviation and a second reference value of the minimum or a local minimum of the deviation for said deviation waveform, and calculating a value of a difference between the first reference value and the second reference value; and
difference value determining means for determining whether or not a value of a difference meets a specific condition. - View Dependent Claims (8)
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Specification