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We show that the use of Random Optical Grating using UV Exposure (ROGUE) cansignificantly reduce the noise floor of an optical frequency domainreflectometry (OFDR) measurement of Faraday rotation in the polarization. Wecompare it with unexposed spun fiber which shows a S/P minimum ratio (signalnoise floor) 20 dB higher than when using our ROGUE. High sensitivity magneticfield measurements are achieved by spatially filtering (setting a gage length)the derivative of the S/P ratio's evolution. Example of a calibratedelectromagnet spatially resolved B-field measurement is demonstrated, which canmeasure fields down to 10 mT with 10 cm spatial resolution. The potential forcurrent sensing using such ROGUE apparatus is discussed and simulation shows anoise floor of around 1 A with 40 probing loops spatial resolution.

Enhanced sensitivity distributed sensing of magnetic fields in optical fiber using random Bragg grating