Methods for reducing noise in an electrical signal
First Claim
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1. A method for reducing the noise in an electrical signal, said signal having a finite length, comprising:
- (a) providing a function defined over the length of the signal which characterizes the signal'"'"'s local noise;
(b) locally evaluating said function;
(c) locally determining the signal'"'"'s noise based on the result of step (b);
(d) locally subtracting the noise determined in step (c) from the signal; and
(e) repeating steps (b) through (d) over the length of the signal so as to produce a noise-reduced signal.
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Abstract
Methods for determining optical properties of an optical waveguide fiber using an optical time domain reflectometer (OTDR) are provided. The methods involve the removal of noise from an OTDR trace (signal) by fitting the noise component of the signal and then subtracting the fitted noise from the original signal to produce a noise-reduced signal. Optical properties are more readily determined from the noise-reduced signal than from the original signal. In particular, the noise-reduced signal can be used to determine axial optical properties of long fibers, e.g., fibers having a length of 50 kilometers or more.
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Citations
8 Claims
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1. A method for reducing the noise in an electrical signal, said signal having a finite length, comprising:
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(a) providing a function defined over the length of the signal which characterizes the signal'"'"'s local noise; (b) locally evaluating said function; (c) locally determining the signal'"'"'s noise based on the result of step (b); (d) locally subtracting the noise determined in step (c) from the signal; and (e) repeating steps (b) through (d) over the length of the signal so as to produce a noise-reduced signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification