Weakly coupled few-mode optical fiber with slope type refractive index distribution
A refractive index distribution, few-mode fiber technology, applied in graded index core/clad fibers, clad fibers, light guides, etc. , the effect of degenerate mode is not obvious, etc., to reduce the coupling between modes, crosstalk between small modes, and expand the number of channels
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Embodiment 1
[0052] In this embodiment, a single-core weakly coupled few-mode fiber with a slope-type refractive index distribution is taken as an example.
[0053] A weakly coupled few-mode optical fiber with a slope-type refractive index distribution, the schematic diagram of which is shown in figure 1 , including a core 101 and a cladding 102.
[0054] The core 101 adopts a quartz glass rod doped with a high refractive index material, and the high refractive index material used in this embodiment is GeO 2 , the cladding 102 is pure silica glass, and the refractive index n of the cladding 102 0 =1.444, the maximum value n of the refractive index of the core 101 1 and cladding index n 0 The relative refractive index difference between (n 1 -n 0 ) / n 0 =0.95%, the high refractive index material GeO in this embodiment 2 The doping concentration of along the fiber section, one end of the diameter increases from 0, namely n d =n 0 , the diameter of the core 101 is 16 μm, as a comparis...
Embodiment 2
[0062] A weakly coupled few-mode optical fiber with a slope-type refractive index distribution, as in Embodiment 1, including a cladding and a fiber core disposed in the cladding, wherein the maximum value of the core refractive index > the minimum value of the core refractive index ≥ cladding The refractive index of the layer, in the cross-section of the optical fiber, the refractive index of the fiber core is distributed in a slope-type refractive index distribution, and the refractive index of the fiber core is distributed in a symmetrical slope-type distribution on both sides with respect to the horizontal diameter of the fiber; the difference is: wherein, in this embodiment The corresponding refractive index distribution diagram of the weakly coupled few-mode fiber with slope-type refractive index distribution in Figure 8 , whose distribution function is based on a linear function.
Embodiment 3
[0064] A weakly coupled few-mode optical fiber with a slope-type refractive index distribution, as in Embodiment 1, including a cladding and a fiber core disposed in the cladding, wherein the maximum value of the core refractive index > the minimum value of the core refractive index ≥ cladding The refractive index of the layer, in the cross-section of the optical fiber, the refractive index of the fiber core is distributed in a slope-type refractive index distribution, and the refractive index of the fiber core is distributed in a symmetrical slope-type distribution on both sides with respect to the horizontal diameter of the fiber; the difference is: wherein, in this embodiment The corresponding refractive index distribution diagram of the weakly coupled few-mode fiber with slope-type refractive index distribution in Figure 9 , whose distribution function is based on an exponential function with base e.
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