# A Robust Fiber-based Frequency Synchronization System Immune to Dramatic Temperature Fluctuation

## TL;DR

This paper presents a fiber-based frequency synchronization system that maintains high stability despite large temperature fluctuations, making it suitable for large-scale scientific projects.

## Contribution

A novel non-harmonic frequency dissemination scheme demonstrating robustness against dramatic temperature changes in fiber links.

## Key findings

- Achieved relative frequency stability of 4.0E-14/s in daily temperature fluctuation tests.
- Achieved relative frequency stability of 3.0E-16/1E4 s in hourly temperature fluctuation tests.
- System remains stable under temperature variations of 40°C per day and 20°C per hour.

## Abstract

Fiber-based frequency synchronization system is sensitive to temperature change because of the limited isolation and nonlinear effect of RF components in the system. In order to make it suitable for the use of large-scale scientific and engineering projects in which the ambient temperature of the fiber link changes dramatically, we designed a non-harmonic frequency dissemination system immune to temperature fluctuation. After the lab tests in which the ambient temperature of fiber fluctuates 40 degrees centigrade per day and 20 degrees centigrade per hour respectively, the relative frequency stabilities of this system reached 4.0 E-14/s and 3.0 E-16/1E4 s. It is demonstrated that the proposed non-harmonic scheme shows a strong robustness to the complicated working environment with dramatic temperature fluctuation.

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Source: https://tomesphere.com/paper/1702.06599