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Ruishan Chen, Jinghao Wang, Xiaoqiang Zhang, et al. Fiber-based mode converter for generating optical vortex beams. Opto‐Electron Adv 1, 180003 (2018). doi: 10.29026/oea.2018.180003
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Original Article Open Access
Fiber-based mode converter for generating optical vortex beams
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Abstract
In this work, an all-fiber-based mode converter for generating orbital angular momentum (OAM) beams is proposed and numerically investigated. Its structure is constructed by cascading a mode selective coupler (MSC) and an inner elliptical cladding fiber (IECF). OAM modes refer to a combination of two orthogonal LPlm modes with a phase difference of ±π/2. By adjusting the parameters and controlling the splicing angle of MSC and IECF appropriately, higher-order OAM modes with topological charges of l = ±1, ±2, ±3 can be obtained with the injection of the fundamental mode LP01, resulting in a mode-conversion efficiency of almost 100%. This achievement may pave the way towards the realization of a compact, all-fiber, and high-efficiency device for increasing the transmission capacity and spectral efficiency in optical communication systems with OAM mode multiplexing.-
Keywords:
- optical vortices /
- fiber optics /
- singular optics /
- mode-division multiplexing
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References
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Ruishan Chen, Jinghao Wang, Xiaoqiang Zhang, et al. Fiber-based mode converter for generating optical vortex beams. Opto‐Electron Adv 1, 180003 (2018). doi: 10.29026/oea.2018.180003
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Figure 1.
Effective indices of different modes in the SMF (LP01 mode) and MMF (LP/1 modes) at a wavelength of 1550 nm.
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Figure 2.
Normalized power conversion (a) from the LP01 mode to the
$LP_{l1}^c $ $LP_{21}^c $ $LP_{31}^c $ -
Figure 3.
(a) Cross section and refractive-index distribution of the IECF. (b) Three-dimensional structure of the IECF.
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Figure 4.
Evolution diagrams of intensity and phase from the LP01 mode to the
$LP_{11}^c $ $LP_{21}^c $ $LP_{31}^c $ $LP_{11}^c $ $LP_{21}^c $ $LP_{21}^c $ -
Figure 5.
Normalized power evolution between the
$LP_{l1}^c $ $LP_{l1}^s $ -
Figure 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 LIECF.
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Figure 7.
Purity of the first-order OAM mode generated by MSC1 cascaded with IECF1 at different values of LIECF.
