CPC G01D 5/35316 (2013.01) [G01D 5/35383 (2013.01); G02B 6/26 (2013.01); G02B 6/34 (2013.01); Y02B 10/30 (2013.01)] | 30 Claims |
1. A method of determining perturbation of a grating formed in an optical fiber, the method comprising:
modulating and transmitting a light beam through the optical fiber, dispersing light reflected off the grating, measuring at least one phase shift in a modulation of said reflected light, and determining the perturbation of the grating based on said at least one phase shift;
wherein said dispersing is prior to said measurement of said at least one phase shift;
wherein the optical fiber is formed with a plurality of gratings, wherein at least two of said gratings are characterized by different Bragg wavelengths, wherein said measurement of said at least one phase shift is characterized by a predetermined phase resolution, and said dispersing is characterized by a predetermined dispersion parameter describing pulse broadening per unit wavelength, and wherein a frequency of said modulating is at least a ratio between said phase resolution and a multiplication of said dispersion parameter by a predetermined spectral resolution threshold.
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