The crosstalk between the multicasted OAM channels and their neighboring ones are assessed to be less than −30 dB. Meanwhile, OAM multicasting could also be realized in the designed NCSF. Moreover, even for a fabricated NCSF, the CE could be dynamically changed by stretching the fiber or by adjusting the refractive index of the fiber cores through external control of the environmental conditions. Take N = 6 as an example, ~37% CE could be achieved at telecom bands.
The conversion efficiency (CE) of the converted OAM states could be optimized by properly designing the fiber structure.
We propose and numerically demonstrate a conversion and multicasting scheme of orbital angular momentum (OAM) states by using N-core supermode fiber (NCSF), where the topological charges of converted OAM states mainly depend on the injected OAM state and the number of fiber cores.
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