6 August 1998 Distance scale calibration of optical fiber OTDR
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In this paper we present the distance scale calibration of optical fiber Optical Time Domain Reflectometers (OTDR) using the optical time-delay recirculating line approach. Particularly we demonstrate the optical modulation - phase-shift technique to measure the length of the standard fiber which formed the loop of the delay line. Two stages of modulations of 10 KHz and 1 MHz were used to achieve, step-by-step, the final optical length uncertainty of less than 0.02m+1.20 X 10-6. The length measurement results were self-checked and they are well within the quoted uncertainty. With the calibrated delay recirculating-line as a transfer standard the distance scale of the OTDRs is verified to the uncertainty of about 2 x 10-5, depending on the OTDRs’ performance.
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Yuwen Fang, Jin Qian, Minming Wang, Xuesong Li, Tianchu Li, "Distance scale calibration of optical fiber OTDR", Proc. SPIE 3552, Fiber Optic Components and Optical Communication II, (6 August 1998); doi: 10.1117/12.318004; https://doi.org/10.1117/12.318004

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