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January 25, 2026

Remote‐Head Optical Correlation‐Domain Reflectometry Using Kilometer‐Scale Fibers

Key Points

The research aims to develop and test a remote-head optical correlation-domain reflectometry system for improved field use.
Developed a remote-head system for optical correlation-domain reflectometry
Connected fiber under test to the main system via kilometer-scale fibers
Conducted measurements to assess reflectivity distribution and spatial resolution
Achieved clear measurement of reflectivity distribution in the fiber under test
Detected multiple reflection points with approximately 15 cm spatial resolution
Confirmed feasibility for practical infrastructure monitoring

Abstract

Optical correlation‐domain reflectometry (OCDR) provides distributed reflectivity measurements with moderate range, high spatial resolution, and real‐time capability. Conventional systems, however, rely on bulky instruments that hinder field use. We propose and experimentally demonstrate a remote‐head OCDR, where only the fiber under test (FUT) and circulator are placed on‐site, connected to the main system via kilometer‐scale fibers. The reflectivity distribution of the FUT was clearly measured, with multiple reflection points detected and ~ 15 cm spatial resolution maintained. These results confirm the feasibility of remote‐head OCDR and its potential for practical infrastructure monitoring. © 2026 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.

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