US 11,698,277 B2
Method and system for determining grating perturbation by modulated light
Shmuel Sternklar, Yakir (IL); and Ziv Glasser, Ariel (IL)
Assigned to Ariel Scientific Innovations Ltd., Ariel (IL)
Appl. No. 17/256,664
Filed by Ariel Scientific Innovations Ltd., Ariel (IL)
PCT Filed Jul. 4, 2019, PCT No. PCT/IL2019/050742
§ 371(c)(1), (2) Date Dec. 29, 2020,
PCT Pub. No. WO2020/008464, PCT Pub. Date Jan. 9, 2020.
Claims priority of provisional application 62/693,941, filed on Jul. 4, 2018.
Prior Publication US 2021/0262835 A1, Aug. 26, 2021
Int. Cl. G01D 5/353 (2006.01); G02B 6/26 (2006.01); G02B 6/34 (2006.01)
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
OG exemplary drawing
 
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.