Phase Recovery and Stability: Arbitrary Phase Access for Stable Fiber Interferometers (Laser Photonics Rev. 15(7)/2021)

Practical systems for optical interference are critical to coherent signal processing in devices and networks. In article number 2000524, Roberto Morandotti, Michael Kues, and co-workers demonstrate an easily-deployable scheme for the retrieval of relative phase in fiber interferometric systems. The use of bright and dim/photon-level reference signals is contrasted, with pulsed references shown to enable temporal multiplexing with quantum signals.