Accurate and fast fiber transfer delay measurement based on phase discrimination and frequency measurement

TL;DR

This paper presents a rapid and precise fiber transfer delay measurement method utilizing phase discrimination and frequency measurement, achieving high accuracy and large dynamic range with simplified ambiguity resolution.

Contribution

The paper introduces a novel measurement technique that combines phase discrimination and frequency measurement to improve accuracy and speed in fiber delay measurements.

Findings

Achieves 0.3 ps measurement accuracy

Provides 0.1 ps resolution

Supports up to 50 km dynamic range

Abstract

An accurate and fast fiber transfer delay measurement method is demonstrated. As a key technique, a simple ambiguity resolving process based on phase discrimination and frequency measurement is used to overcome the contradiction between measurement accuracy and system complexity. The optimized system achieves a high accuracy of 0.3 ps with a 0.1 ps resolution, and a large dynamic range up to 50 km as well as no dead zone.