Rare earth-doped multi-core optical fiber, optical fiber preform rod, preparation method and application thereof
A fiber preform, multi-core fiber technology, applied in glass manufacturing equipment, manufacturing tools, etc., can solve problems such as deterioration, fiber damage beam quality, nonlinear effects, etc., achieve large mode field area, increase transmission power, and excellent beam quality quality effect
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[0065] In a second aspect, an embodiment of the present invention provides a method for preparing a rare earth-doped multi-core optical fiber preform, including the following steps:
[0066] (1) M pieces of rare earth-doped core rods are deposited in the liner of pure silica material, so that the core relative refractive index difference of M-1 preform rods is Δ2 and the diameter is d 2 , and Δ2 and d 2 The relationship that needs to be satisfied is:
[0067] The relative refractive index difference of the remaining one core layer is Δ1, and the diameter is d 1 , and Δ1 and d 1 The relationship that needs to be satisfied is:
[0068] (2) the M core rods obtained in the step (1) are fused into M solid rods with matching sleeves of pure silica material;
[0069] (3) grinding the solid bar obtained in step (2) into a regular hexagonal bar, and its side-to-edge distance is 1, wherein, 1 and d 1 , d 2 The relationship that needs to be satisfied is:
[0070] (4) Prepare...
Example Embodiment
[0094] Example 1
[0095] A rare earth-doped multi-core optical fiber preform, such as figure 1 As shown, it includes a preform 1 for forming the core, a preform 2 for forming the core except the middle core, a glass sleeve 3 for forming the cladding, and a glass filament 4 for filling the gap; wherein , a total of 7 preforms are used to form the core, each of which is composed of a Yb-doped core region and a cladding of pure silica, and the core relative refractive index difference Δ1 of the preform that constitutes the middle core is 0.12% , the diameter is 2.5mm, the material of the cladding is pure silica, the shape is a regular hexagon, and its edge-edge distance is 3.6mm; the core relative refractive index difference Δ2 of the preform that constitutes the surrounding 6 cores is 0.07 %, the diameter is 3mm, the material of the cladding is pure silicon dioxide, the shape is a regular hexagon, and its edge-edge distance is 3.6mm;
[0096]The glass sleeve used to form the ...
Example Embodiment
[0112] Example 2
[0113] A rare earth-doped multi-core optical fiber preform, such as Figure 5 As shown, it includes a preform 1 for forming an intermediate core, a preform 2 for forming the remaining cores except the intermediate core, a glass fiber 3 for filling the gap, and a glass sleeve 4 for forming the cladding; wherein There are a total of 19 preforms used to form the core, each of which is composed of a Tm-doped core region and a pure silica cladding. The diameter is 4mm, the material of the cladding is pure silica, the shape is a regular hexagon, and its side-to-side distance is 6mm; the relative refractive index difference Δ2 of the cores of the preform that constitutes the surrounding 18 cores is 0.085%, and the diameter is 4mm, the material of the cladding is pure silicon dioxide, the shape is a regular hexagon, and its edge-edge distance is 6mm;
[0114] The glass sleeve used to form the cladding is made of pure silica, the inner diameter is 30mm, the outer d...
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