Xiaoqiang Zhang, Ruishan Chen, Yong Zhou, Hai Ming, Anting Wang, "Mode selective coupler for optical vortices generation (Invited Paper)," Chin. Opt. Lett. 15, 030008 (2017)

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- Chinese Optics Letters
- Vol. 15, Issue 3, 030008 (2017)

Fig. 1. Cross section of an MSC. Fiber 1 is an MMF, fiber 2 is an SMF, and they have the same cladding. The distance between them is d .

Fig. 2. Effective refractive indices of the modes in a fiber. The dashed line is phase matched between different modes at n eff = 1.449 . The wavelength, and the indices of the core and the cladding are 1.55 μm, n co = 1.4546 , and n cl = 1.4446 , respectively, and the core radius of fiber 1 and fiber 2 are 12 and 3 μm, respectively.

Fig. 3. Relative coupling coefficient between fiber 1 and fiber 2 as a function of the azimuthal angle α in an MMF.

Fig. 4. Cross section of the three-core MSC; fiber 2 and fiber 3 are SMFs, and fiber 1 is an MMF. θ is the angle between fiber 2 and fiber 3.

Fig. 5. (a) Normalized coupled power between fiber 2 (LP 01 mode) and fiber 1 (LP 11 s mode); (b) normalized coupled power between fiber 3 (LP 01 mode) and fiber 1 (LP 11 c mode). P 2 and P 3 are incident powers in fiber 2 and fiber 3, and P 1 is the coupled power in fiber 1. z c = 1.51 cm .

Fig. 6. (a) Normalized coupled power between fiber 2 (LP 01 mode) and fiber 1 (LP 31 s mode); (b) normalized coupled power between fiber 3 (LP 01 mode) and fiber 1 (LP 31 c mode); (c) the intensity generated in fiber 1 and the phase profiles of the coupled mode in fiber 1 with topological charge equal to three. P 2 and P 3 are incident powers in fiber 2 and fiber 3, and P 1 is the coupled power in fiber 1. z c = 4.92 cm .
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Table 1. Mode Patterns Formed in Fiber 1 by Various Phase Differences of Input Modes in SMFs

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