Large-mode-field single-mode transmission optical fiber
A technology for transmitting optical fiber and large mode field, which is applied in the direction of cladding optical fiber, multi-layer core/cladding optical fiber, graded index core/cladding optical fiber, etc. Coupling efficiency of optical path, nonlinear behavior of enhanced fiber, etc.
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Embodiment 1
[0040] This embodiment provides a single-mode transmission fiber with trapezoidal refractive index core layer, multiple ravines, large mode field and low bending loss, including two layers of cores with different refractive indices, trapezoidal graded index rings, multiple ravines and cladding; From the inside to the outside, there are fiber core layer, fiber core layer, trapezoidal gradient ring, multiple ravines and cladding.
[0041] Among them: the core layer includes a two-layer core structure, and the refractive index of the outer core is slightly lower than the inner core. Compared with the single-layer core structure, the two-layer core structure can adjust the core and cladding The refractive index difference between them is conducive to the realization of large mode field single-mode transmission.
[0042] The gradient index ring adopts the gradient index ring as the resonant ring, which is resonantly coupled with the mode, which is beneficial to increase the mode fi...
Embodiment 2
[0047]This embodiment is on the basis of embodiment 1:
[0048] In the core layer, the inner core radius r 0 =30μm, the refractive index is 1.44, the thickness d of the outer core ring 0 =5 μm, the refractive index is 1.4399.
[0049] In the trapezoidal refractive index gradient ring, the inner thickness of the trapezoidal refractive index gradient ring d 1 =6μm, the refractive index increase rate is 8.33×10 -5 / μm, distance t between two gradient rings 1 =6μm, refractive index 1.44, outside thickness d 1 =6μm, the refractive index increase rate is -8.33×10 -5 / μm.
[0050] In the multi-gully groove, the thickness d of the first gully 2 =12μm, the refractive index is 1.439, and the distance between two ravines is t 2 =12μm, the refractive index is 1.4395, the thickness d of the second groove 2 =12 μm, the refractive index is 1.439.
[0051] The distance t between the core layer and the trapezoidal refractive index gradient ring 0 =19μm, the interval t between the tr...
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