In the maintenance of optical fiber networks, there is a growing demand for high-precision measurement of optical loss distribution and fault locations over long distances. In this study, we propose an OCDR method incorporating periodic pseudo-random modulation (PPRM), and demonstrate that it enables the acquisition of loss distribution based on Rayleigh scattering and the positions of reflection points in an approximately 100-km optical fiber, with a spatial resolution of about 19 cm and a measurement time of about 20 seconds.
@article{arxiv.2511.18400,
title = {High-Spatial-Resolution Optical Correlation-Domain Reflectometry with 100-km Measurement Range},
author = {Takaki Kiyozumi and Soshi Yoshida and Yuta Higa and Keisuke Motoda and Sze Yun Set and Shinji Yamashita and Yosuke Mizuno},
journal= {arXiv preprint arXiv:2511.18400},
year = {2025}
}