Highly accurate fiber transfer delay measurement with large dynamic range

TL;DR

This paper presents a novel fiber transfer delay measurement method that converts time domain measurements into frequency domain analysis, achieving sub-picosecond accuracy over 50 km with no dead zone.

Contribution

It introduces a new approach that combines frequency domain analysis with coarse ambiguity resolution for highly accurate fiber delay measurements.

Findings

Achieves 1 picosecond measurement accuracy.

Supports a dynamic range up to 50 km.

Operates without measurement dead zones.

Abstract

A novel and efficient method for fiber transfer delay measurement is demonstrated. Fiber transfer delay measurement in time domain is converted into the frequency measurement of the modulation signal in frequency domain, accompany with a coarse and easy ambiguity resolving process. This method achieves a sub-picosecond resolution, with an accuracy of 1 picosecond, and a large dynamic range up to 50 km as well as no measurement dead zone.