Abstract
Recently, the growing interest in few-mode fibers in telecommunications and high-power lasers has stimulated the demand for fiber mode decomposition (MD). Here we present a fast fiber MD method with a lensless fiber-point-diffraction interferometer. The complex amplitude at the fiber end is achieved by the polarization phase-shifting technique and the lensless imaging technique. Then, the eigenmode coefficients are determined by the mode orthogonal operations of the complex amplitude. In the experiment, the SMF-28e fiber containing 10 linear polarized modes at the wavelength of 632.8 nm is studied for MD. The decomposition of the 50 * 50 pixels interferograms takes only 0.0168 s. The similarity of the intensity patterns of the testing light is larger than 97% before and after the MD. This new, to the best of our knowledge, method can achieve fast and accurate 10-mode MD without using any imaging systems.
© 2021 Optical Society of America
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Junbo Li, Xiaoyu Zhang, Yunhan Zheng, Fangxin Li, Xiaoqin Shan, Zhigang Han, and Rihong Zhu, "Fast fiber mode decomposition with a lensless fiber-point-diffraction interferometer: publisher’s note," Opt. Lett. 46, 2823-2823 (2021)https://opg.optica.org/ol/abstract.cfm?uri=ol-46-12-2823
26 May 2021: A typographical correction was made to the affiliations.
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