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• A dual-laser OCDR configuration is proposed for distributed reflectivity sensing. • The method eliminates AOMs and delay lines for simpler system architecture. • Frequency flexibility avoids folding noise seen in conventional OCDR. • The technique ensures uniform spatial resolution and linear time-position mapping. We develop a new configuration of optical correlation-domain reflectometry (OCDR), termed dual-laser OCDR, which utilizes two independent laser diodes for the incident and reference light sources. We experimentally verify its operation via distributed reflectivity measurement along a 52-m-long sensing fiber under the control of the relative modulation phase between the incident and reference lights. The unique operation of dual-laser OCDR offers multiple advantages over conventional OCDR, including system simplification and constant spatial resolution over sensing position.
Motoda et al. (Tue,) studied this question.