Abstract
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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