Phase noise cancellation in polarisation-maintaining fibre links

TL;DR

This paper demonstrates a laboratory-scale polarisation-maintaining fibre network with active phase noise cancellation at 578 nm, achieving stability below 1×10^(-19) after long-term averaging, enhancing laser distribution for precision metrology.

Contribution

It introduces a novel active phase noise cancellation system in a polarisation-maintaining fibre network operating at 578 nm with high stability and accuracy.

Findings

Achieved stability below 1×10^(-19) after 10,000 seconds

Implemented all polarisation-maintaining fibres in the setup

Demonstrated effective noise cancellation at low optical powers

Abstract

The distribution of ultra-narrow linewidth laser radiation is an integral part of many challenging metrological applications. Changes in the optical pathlength induced by environmental disturbances compromise the stability and accuracy of optical fibre networks distributing the laser light and call for active phase noise cancellation. Here we present a laboratory scale optical (at 578 nm) fibre network featuring all polarisation maintaining fibres in a setup with low optical powers available and tracking voltage-controlled oscillators implemented. The stability and accuracy of this system reach performance levels below 1 * 10^(-19) after 10 000 s of averaging