Research article: <a href="https://www.nature.com/articles/s41377-018-0070-5" rel="nofollow">https://www.nature.com/articles/s41377-018-0070-5</a><p>Based on <a href="https://en.wikipedia.org/wiki/Fibre_optic_gyroscope" rel="nofollow">https://en.wikipedia.org/wiki/Fibre_optic_gyroscope</a>
which uses <a href="https://en.wikipedia.org/wiki/Sagnac_effect" rel="nofollow">https://en.wikipedia.org/wiki/Sagnac_effect</a>