A mode generator and multiplexer at visible wavelength based on all-fiber mode selective coupler

Nanophotonics

article

Han Yao¹  Xianglong Zeng¹  Fan Shi¹  Zhaoyang Wu²  Xinzhu Xu²  Teng Wang¹  Xiaomin Liu³  Peng Xi²  Fufei Pang¹ 

[1] 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;Department of Biomedical Engineering, College of Engineering, Peking University;Max Planck Institute for Polymer Research

关键词: mode selective coupler (MSC);    wavelength multiplexer;    confocal;   

DOI  :  10.1515/nanoph-2020-0050

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

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.

【 授权许可】

CC BY