Latency Measurement of 100 km Fiber Using Correlation-OTDR

TL;DR

This paper demonstrates a highly precise method for measuring 100 km fiber latency using Correlation-OTDR, achieving picosecond accuracy and validating results with multiple measurement setups.

Contribution

It introduces a novel application of Correlation-OTDR for ultra-precise fiber latency measurement with validation through multiple measurement configurations.

Findings

Latency measurement accuracy of a few picoseconds.

Standard deviation of 12 ps over 49 measurements.

Maximum difference of 11 ps in reflection measurement verification.

Abstract

By means of C-OTDR (Correlation - Optical Time Domain Reflectometry), we measured the latency of100 km fiber with an accuracy of a few picoseconds. Based on iterating 49 measurements, we calculated a standard deviation of 12 ps between the round-trip latency values. To verify the reflection measurements, we used a single pass setup without reflector, which showed a maximum difference of only 11 ps.