Modified Expression for Spatial Resolution in Optical Correlation-Domain Reflectometry

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Abstract
Optical correlation-domain reflectometry (OCDR) is a technique used to detect faulty connections and splices in a fiber under test. Several simple configurations have been developed to reduce the size of the experimental setup. However, the theoretical spatial resolutions calculated by the original theory on standard OCDR do not agree with the experimental values obtained by simplified OCDR. In this paper, to clarify the cause of the inconsistency between the theoretical and measured spatial resolutions in simplified OCDR, we newly establish a comprehensive theory for both standard and simplified OCDR systems using the concept of the “beat spectrum,” which is primarily used in theoretical studies for Brillouin optical correlation-domain reflectometry / analysis (BOCDR / A). In addition, we derive a modified expression for the spatial resolution; this highlights a trade-off relationship between spatial resolution and measurement range, which is a well-known property for BOCDR / A but has not been previously reported for OCDR.
Funding Information
  • Japan Society for the Promotion of Science (JSPS) Kakenhi (23KJ0358, 21H04555)
  • Takahashi Industrial and Economic Research Foundation
  • Yazaki Memorial Foundation for Science and Technology
  • Konica Minolta Imaging Science Foundation

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