Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1999-08-02
2000-10-31
Font, Frank G.
Optics: measuring and testing
For optical fiber or waveguide inspection
G01N 2100
Patent
active
06141090&
ABSTRACT:
Fiber optic cable waste is avoided by measuring amplitude oscillations of four-wave mixing products in positive-dispersion and negative-dispersion fiber optic cable to determine the lengths of a first, positive-dispersion cable segment and a second, negative-dispersion cable segment that are used to provide a specified length of fiber optic cable having a specified amount of path-average chromatic dispersion. The integrated dispersion of a positive-dispersion fiber optic cable as a function of length is measured to provide a first set of data, and the integrated dispersion of a negative-dispersion fiber optic cable as a function of length is measured to provide a second set of data. A fiber-optic cable is simultaneously fed with two optical signals, a first at wavelength .lambda..sub.1 and a second at wavelength .lambda..sub.2, and the number of sinusoidal oscillations that occur in the four-wave mixing products of the Stokes (or anti-Stokes) sideband as a function of cable length are measured. The second set of data is reflected about a line representing zero length, linearly translated by the specified length along a length axis, and then linearly translated by the specified dispersion along an integrated dispersion axis to provide a transformed second set of data. A point of intersection of the first set of data with the transformed second set of data is calculated. A length coordinate of this point of intersection represents the length of the first cable segment. A length for the second cable segment is calculated by subtracting the length of the first cable segment from the specified length.
REFERENCES:
patent: 5778128 (1998-07-01), Wildeman
patent: 6011615 (2000-01-01), Mamyshev et al.
Mamyshev Pavel V.
Mollenauer Linn Frederick
Font Frank G.
Lucent Technologies - Inc.
Ratiff Reginald
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