A mode generator and multiplexer at visible wavelength based on all-fiber mode selective coupler
Yao Han,
Shi Fan,
Wu Zhaoyang,
Xu Xinzhu,
Wang Teng,
Liu Xiaomin,
Xi Peng,
Pang Fufei,
Zeng Xianglong
Affiliations
Yao Han
Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication, Shanghai Institute for Advanced Communication and Data Science, Shanghai University, Shanghai 200444, P.R. China
Shi Fan
Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication, Shanghai Institute for Advanced Communication and Data Science, Shanghai University, Shanghai 200444, P.R. China
Wu Zhaoyang
Department of Biomedical Engineering, College of Engineering, Peking University, Beijing 100871, P.R. China
Xu Xinzhu
Department of Biomedical Engineering, College of Engineering, Peking University, Beijing 100871, P.R. China
Wang Teng
Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication, Shanghai Institute for Advanced Communication and Data Science, Shanghai University, Shanghai 200444, P.R. China
Liu Xiaomin
Max Planck Institute for Polymer Research, 55128 Mainz, Germany
Xi Peng
Department of Biomedical Engineering, College of Engineering, Peking University, Beijing 100871, P.R. China
Pang Fufei
Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication, Shanghai Institute for Advanced Communication and Data Science, Shanghai University, Shanghai 200444, P.R. China
Zeng Xianglong
Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication, Shanghai Institute for Advanced Communication and Data Science, Shanghai University, Shanghai 200444, P.R. China
Using an all-fiber mode selective coupler (MSC) at the visible band, here we experimentally demonstrate a generating and wavelength multiplexing scheme for the cylindrical vector (CV) and vortex beams (VBs). The proposed MSCs act as efficient mode converters to produce spectrally insensitive high-order modes (HOMs) at the wavelength ranging from 450 to 980 nm, which have broad operation bandwidth (more than 7 nm), high mode conversion efficiency (94%), and purity (98%), and low insert loss (below 0.5 dB). By adjusting the polarization state and the phase shift of linear polarization (LP)11 mode respectively, the donut-shaped CVs and circular-polarization VBs are achieved. The focused intensity distribution of the donut beam on the cross- and axial-sections is monitored by using a confocal system. The all-fiber solution of producing and multiplexing HOMs opens a new route for stimulated emission depletion microscopy applications.
