Improvement of accuracy for measurement of 100-km fibre latency with Correlation OTDR

TL;DR

This paper demonstrates enhanced accuracy in measuring 100-km fiber latency by employing a Correlation OTDR with higher probe signal rate, dispersion compensation, and external time base synchronization.

Contribution

The study introduces a method combining increased probe signal rate, dispersion compensation, and external synchronization to improve fiber latency measurement accuracy.

Findings

Latency measurement accuracy was improved compared to previous methods.

Using a 10 Gbit/s probe signal enhanced temporal resolution.

External PPS synchronization reduced measurement errors.

Abstract

We measured the latency of a 100 km fibre link using a Correlation OTDR. Improvements over previous results were achieved by increasing the probe signal rate to 10 Gbit/s, using dispersion compensation gratings, and coupling the receiver time base to an external PPS signal.