Highly efficient excitation of LP<sub>01</sub> mode in ring-core fibers by tapering for optimizing OAM generation

Chunxiang Zhang; Fufei Pang; Huanhuan Liu; Lifei Chen; Junfeng Yang; Jianxiang Wen; Tingyun Wang

doi:doi:10.3788/COL202018.020602

Chinese Optics Letters, 2020, 18 (2): 020602, Published Online: Jan. 7, 2020

Highly efficient excitation of LP₀₁ mode in ring-core fibers by tapering for optimizing OAM generation Download： 1444次

Chunxiang Zhang Fufei Pang Huanhuan Liu Lifei Chen Junfeng Yang Jianxiang Wen Tingyun Wang ^*

Author Affiliations

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, China

Figures & Tables

Fig. 1. Schematic diagram of fiber structure and refractive index profile for (a) single-mode fiber (SMF) and (b) ring-core fiber (RCF); (c) schematic diagram of fusion splicing and tapering scheme for exciting the ${LP}_{01}$ mode in the RCF with high efficiency.

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Fig. 2. Simulation of light propagation and coupling power evolution along the tapered fibers with different stretched lengths: (a) 5000 μm and (b) 16,000 μm.

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Fig. 3. Theoretical optimization of coupling efficiency in the relationship of waist radius.

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Fig. 4. Experimental setup of characterizing coupling efficiency and mode changes in the SMF–RCF taper.

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Fig. 5. Transmission of the SMF–RCF taper: (a) RCF connected to optical spectrum analyzer (OSA) directly; (b) RCF connected to the OSA with an SMF.

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Fig. 6. The influence of wavelength on coupling efficiency of modes in the RCF from 1530 nm to 1570 nm.

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Fig. 7. (a) Experimental setup of orbital angular moment (OAM) generation and test system. (b) Mode field and interference fringe of the ${LP}_{01}$ mode in the RCF. (c) Mode field and interference fringe of ${OAM}_{+ 1}$ . (d) Mode field and interference fringe of ${OAM}_{- 1}$ .

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Chunxiang Zhang, Fufei Pang, Huanhuan Liu, Lifei Chen, Junfeng Yang, Jianxiang Wen, Tingyun Wang. Highly efficient excitation of LP₀₁ mode in ring-core fibers by tapering for optimizing OAM generation[J]. Chinese Optics Letters, 2020, 18(2): 020602.

Highly efficient excitation of LP₀₁ mode in ring-core fibers by tapering for optimizing OAM generation Download： 1444次

Fig. 1. Schematic diagram of fiber structure and refractive index profile for (a) single-mode fiber (SMF) and (b) ring-core fiber (RCF); (c) schematic diagram of fusion splicing and tapering scheme for exciting the ${LP}_{01}$ mode in the RCF with high efficiency.

Fig. 2. Simulation of light propagation and coupling power evolution along the tapered fibers with different stretched lengths: (a) 5000 μm and (b) 16,000 μm.

Fig. 3. Theoretical optimization of coupling efficiency in the relationship of waist radius.

Fig. 4. Experimental setup of characterizing coupling efficiency and mode changes in the SMF–RCF taper.

Fig. 5. Transmission of the SMF–RCF taper: (a) RCF connected to optical spectrum analyzer (OSA) directly; (b) RCF connected to the OSA with an SMF.

Fig. 6. The influence of wavelength on coupling efficiency of modes in the RCF from 1530 nm to 1570 nm.

Fig. 7. (a) Experimental setup of orbital angular moment (OAM) generation and test system. (b) Mode field and interference fringe of the ${LP}_{01}$ mode in the RCF. (c) Mode field and interference fringe of ${OAM}_{+ 1}$ . (d) Mode field and interference fringe of ${OAM}_{- 1}$ .

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Highly efficient excitation of LP01 mode in ring-core fibers by tapering for optimizing OAM generation Download： 1444次

Fig. 1. Schematic diagram of fiber structure and refractive index profile for (a) single-mode fiber (SMF) and (b) ring-core fiber (RCF); (c) schematic diagram of fusion splicing and tapering scheme for exciting the LP01 mode in the RCF with high efficiency.

Fig. 2. Simulation of light propagation and coupling power evolution along the tapered fibers with different stretched lengths: (a) 5000 μm and (b) 16,000 μm.

Fig. 3. Theoretical optimization of coupling efficiency in the relationship of waist radius.

Fig. 4. Experimental setup of characterizing coupling efficiency and mode changes in the SMF–RCF taper.

Fig. 5. Transmission of the SMF–RCF taper: (a) RCF connected to optical spectrum analyzer (OSA) directly; (b) RCF connected to the OSA with an SMF.

Fig. 6. The influence of wavelength on coupling efficiency of modes in the RCF from 1530 nm to 1570 nm.

Fig. 7. (a) Experimental setup of orbital angular moment (OAM) generation and test system. (b) Mode field and interference fringe of the LP01 mode in the RCF. (c) Mode field and interference fringe of OAM+1. (d) Mode field and interference fringe of OAM−1.

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Highly efficient excitation of LP₀₁ mode in ring-core fibers by tapering for optimizing OAM generation Download： 1444次

Fig. 1. Schematic diagram of fiber structure and refractive index profile for (a) single-mode fiber (SMF) and (b) ring-core fiber (RCF); (c) schematic diagram of fusion splicing and tapering scheme for exciting the ${LP}_{01}$ mode in the RCF with high efficiency.

Fig. 7. (a) Experimental setup of orbital angular moment (OAM) generation and test system. (b) Mode field and interference fringe of the ${LP}_{01}$ mode in the RCF. (c) Mode field and interference fringe of ${OAM}_{+ 1}$ . (d) Mode field and interference fringe of ${OAM}_{- 1}$ .