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Instead of classic beam-splitters, the fiber couplers were used to detect the laser heterodyne signals. The heterodyning of two linearly polarized laser beams introduced into the gradient index fiber couplers was observed and analyzed.
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J. Porowski, Elzbieta M. Beres-Pawlik, Krzysztof M. Abramski, "Heterodyning of laser radiation via fiber couplers," Proc. SPIE 2780, Metal/Nonmetal Microsystems: Physics, Technology, and Applications, (8 April 1996); https://doi.org/10.1117/12.238190