CPC G02B 6/03611 (2013.01) [G02B 6/02042 (2013.01); G02B 6/0285 (2013.01)] | 5 Claims |
1. A bending-resistant low-crosstalk photonic orbital angular momentum fiber waveguides, wherein the fiber sequentially consists of a first core layer, a second core layer, a first cladding layer, a second cladding layer, and a third cladding layer from the center outward, with the third cladding layer being the thickest, followed by the first core layer, and the first cladding layer being the thinnest; the refractive index of the first cladding layer is the smallest, followed by the second cladding layer, and the refractive index of the second core layer is the largest; the relationship function relationship A between the radii r1 of the first core layer and r2 of the second core layer satisfies A=k1×10×log(r2/r1)/(L−2), where k1 ranges from 0.36 to 1.52, L ranges from 3 to 9, and A ranges from 0.06446 to 1.61151; the relationship function B between the radius r3 of the first cladding layer and the radius r2 of the second core layer satisfies B=k2×10×log (r3/r2)×(L−2), where k2 ranges from 0.66 to 1.37, L ranges from 2 to 9, and B ranges from 0 to 3.4649; the refractive index difference between the first core layer refractive index n1 and the third cladding layer refractive index n5 is from −0.00029 to −0.01603; the refractive index difference between the second core layer refractive index n2 and the third cladding layer refractive index n5 is from 0.017485 to 0.037885; the refractive index difference between the first cladding layer refractive index n3 and the third cladding layer refractive index n5 is from −0.005 to −0.0153; the refractive index difference between the second cladding layer refractive index n4 and the third cladding layer refractive index n5 is from −0.005 to −0.0153; the refractive index curve of the second core layer refractive index n2 gradually changes and satisfies the refractive index profile distribution function:
![]() g is the refractive index profile distribution parameter, and g ranges from −2 to 9.
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