In a study published in Optics Communications, a research group led by Yu Tao from the Changchun Institute of Optics, Fine Mechanics and Physics (CIOMP) of the Chinese Academy of Sciences proposed a new analytical phase readout algorithm for deep frequency modulation interferometry (DFMI).

The method improves phase measurement accuracy and simplifies signal processing by eliminating the need to explicitly estimate modulation parameters. This offers a promising approach for developing compact interferometric measurement systems for space gravitational wave detection.

Space-based gravitational wave detection requires precise measurements of tiny changes in the distances between freely falling test masses. Laser interferometry provides a powerful means of detecting these minute displacements by measuring variations in optical phase. However, conventional interferometric systems often require complex optical arrangements and electronic components, creating challenges for spacecraft applications.