Fiber-based mode converter for generating optical vortex beams

Ruishan Chen; Jinghao Wang; Xiaoqiang Zhang; Junna Yao; Hai Ming; Anting Wang

doi:10.29026/oea.2018.180003

Journals >Opto-Electronic Advances >Volume 1 >Issue 7 >Page 180003 > Article

Opto-Electronic Advances
Vol. 1, Issue 7, 180003 (2018)

Fiber-based mode converter for generating optical vortex beams

Ruishan Chen¹, Jinghao Wang¹, Xiaoqiang Zhang^1、2, Junna Yao¹, Hai Ming¹, and Anting Wang^1、*

Author Affiliations

¹Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei 230026, China

²Hefei General Machinery Research Institute, Hefei 230031, China

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DOI: 10.29026/oea.2018.180003 Cite this Article

Ruishan Chen, Jinghao Wang, Xiaoqiang Zhang, Junna Yao, Hai Ming, Anting Wang. Fiber-based mode converter for generating optical vortex beams[J]. Opto-Electronic Advances, 2018, 1(7): 180003 Copy Citation Text

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Effective indices of different modes in the SMF (LP01 mode) and MMF (LP/1 modes) at a wavelength of 1550 nm.The black curve shows the effective index of the fundamental mode in the SMF as a function of the core radius. The horizontal lines show the effective indices of the LP/1 modes in the MMF32.

Fig. 1. Effective indices of different modes in the SMF (LP₀₁ mode) and MMF (LP_/1 modes) at a wavelength of 1550 nm.The black curve shows the effective index of the fundamental mode in the SMF as a function of the core radius. The horizontal lines show the effective indices of the LP_/1 modes in the MMF³².

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$Normalized power conversion (a) from the LP01 mode to the \begin{document}$LP_{l1}^c $\end{document} mode in MSC1, (b) from the LP01 mode to the \begin{document}$LP_{21}^c $\end{document} mode in MSC2, and (c) from the LP01 mode to the \begin{document}$LP_{31}^c $\end{document} mode in MSC3 between the SMF and MMF as a function of coupling length L.Insets: simulated intensity profiles of the LP01 and \begin{document}$LP_{/1}^c $\end{document} modes.$

Fig. 2. Normalized power conversion (a) from the LP₀₁ mode to the

\begin{document}$LP_{l1}^c $\end{document}

mode in MSC₁, (b) from the LP₀₁ mode to the

\begin{document}$LP_{21}^c $\end{document}

mode in MSC₂, and (c) from the LP₀₁ mode to the

\begin{document}$LP_{31}^c $\end{document}

mode in MSC3 between the SMF and MMF as a function of coupling length L.Insets: simulated intensity profiles of the LP₀₁ and

\begin{document}$LP_{/1}^c $\end{document}

modes.

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$(a) Cross section and refractive-index distribution of the IECF.(b) Three-dimensional structure of the IECF.$

Fig. 3. (a) Cross section and refractive-index distribution of the IECF. (b) Three-dimensional structure of the IECF.

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$Evolution diagrams of intensity and phase from the LP01 mode to the \begin{document}$LP_{11}^c $\end{document}, \begin{document}$LP_{21}^c $\end{document}, and \begin{document}$LP_{31}^c $\end{document} modes by coupling in the designed MSCs and those from the \begin{document}$LP_{11}^c $\end{document}, \begin{document}$LP_{21}^c $\end{document}, and \begin{document}$LP_{21}^c $\end{document} modes to the OAM±11, OAM±21, and OAM±31 modes after passing through the designed IECFs with different splicing angles of 45°, 22.5°, and 15°34.$

Fig. 4. Evolution diagrams of intensity and phase from the LP₀₁ mode to the

\begin{document}$LP_{11}^c $\end{document}

\begin{document}$LP_{21}^c $\end{document}

, and

\begin{document}$LP_{31}^c $\end{document}

modes by coupling in the designed MSCs and those from the

\begin{document}$LP_{11}^c $\end{document}

\begin{document}$LP_{21}^c $\end{document}

, and

\begin{document}$LP_{21}^c $\end{document}

modes to the OAM_±11, OAM_±21, and OAM_±31 modes after passing through the designed IECFs with different splicing angles of 45°, 22.5°, and 15°³⁴.

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$Normalized power evolution between the \begin{document}$LP_{l1}^c $\end{document} modes and \begin{document}$LP_{l1}^s $\end{document} modes along the propagation length of IECFs. The intersection points of each pair of curves are the corresponding positions of generation of OAM±l1 modes.$

Fig. 5. Normalized power evolution between the

\begin{document}$LP_{l1}^c $\end{document}

modes and

\begin{document}$LP_{l1}^s $\end{document}

modes along the propagation length of IECFs. The intersection points of each pair of curves are the corresponding positions of generation of OAM_±l1 modes.

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Fig. 6. Intensity, phase, interference, and local helicity distributions of the OAM mode with TCs of / = ±1 generated by MSC₁ and IECF₁ at different values of L_IECF.

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Fig. 7. Purity of the first-order OAM mode generated by MSC₁ cascaded with IECF₁ at different values of L_IECF.

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Mode	OAM₁₁/OAM_–11	OAM₂₁/OAM_–21	OAM₃₁/OAM_–31
Δn_eff	0.5×10^–4	0.8×10^–4	0.9×10^–4
Λ (mm)	31	19.4	17.22
L_IECF(mm)	7.75/23.25	4.84/14.53	4.3/12.9

Table 1. Structural parameters of IECFs for the generation of OAM modes

Ruishan Chen, Jinghao Wang, Xiaoqiang Zhang, Junna Yao, Hai Ming, Anting Wang. Fiber-based mode converter for generating optical vortex beams[J]. Opto-Electronic Advances, 2018, 1(7): 180003

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