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Updated: Dec 7, 2025

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
Published on: March 20, 2017
Fringe double for self-mixing interference based on the narrow transmission spectrum mapping
Junbao Chen1, Ming Wang2, Wei Xia2
1Department of Information Technology, Nanjing Forest Police College, Nanjing 210023, People's Republic of China.
Abstract:
In this work, a novel fringe double scheme with a Fabry-Pérot (F-P) cavity is proposed for self-mixing interferometry based on the narrow transmission spectrum mapping. While the laser beam with self-mixing interference (SMI) propagates through the F-P cavity with the narrow transmission spectrum, the SMI fringe doubles as the optical frequency modulation caused by SMI sweeps the peak of the transmission spectrum of the F-P cavity completely. The doubled SMI signal is very suitable for displacement reconstruction with fringe counting and velocity monitoring with joint time-frequency analysis, since it inherits the merits of the transmission spectrum of the F-P cavity (sharp, neat, and stable). This method has the potential to simplify signal processing and improve the resolution of SMI measurement systems.
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