Fiber optic cable having a specified path average dispersion

Optics: measuring and testing – For optical fiber or waveguide inspection

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Details

356 72, 356 73, 356383, G01N 2100

Patent

active

060116153

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: 4183795 (1980-01-01), Bloom et al.
patent: 5121241 (1992-06-01), Veith
patent: 5557694 (1996-09-01), Veith et al.
L. F. Mollenauer et al., "Method for facile and accurate measurement of optical fiber dispersion maps," Optics Letters, 21, No. 21, pp. 1724-1726 (Nov. 1996).

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