Manufacturing method and manufacturing apparatus of optical fiber
A manufacturing method and optical fiber base material technology, applied in glass fiber drawing devices, manufacturing tools, glass manufacturing equipment, etc., can solve problems such as difficulty in ensuring stable quality, and achieve high yields
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Embodiment 1
[0095] Embodiment 1 (assuming the manufacture of an optical fiber wire used in a loose tube optical cable)
[0096] In Example 1, by adjusting the position of the optical fiber preform relative to the heating furnace, the fluctuation range of the optical fiber outer diameter when the torsional strain is applied is approximately 125μm±0.2μm. At this time, the positional shift between the center of the optical fiber preform and the center of the heating furnace was about 10 mm. The approximate cladding out-of-roundness (≈core out-of-roundness) due to the variation range of the fiber outer diameter corresponds to about 0.3%. If the out-of-round ratio is simply calculated by the fluctuation range of the optical fiber outer diameter / the outer diameter of the optical fiber, it is 0.4 μm / 125 μm=0.32%. Using the relational expression analyzed by the above-mentioned finite element method and the conversion formula from multi-refringence to beat length, it can be estimated that the b...
Embodiment 2
[0098] Example 2 (assuming manufacture of optical fiber wires used in slotted cables)
[0099] In Example 2, by making the shape of the heater used in the heating furnace an elliptical shape, the shape of the heater was adjusted so that the fluctuation range of the optical fiber outer diameter when torsional strain was applied was approximately 125μm±0.6μm. The oblateness of the elliptical shape of the resultant heater, that is, (major radius−short radius) / major radius was 5%. The approximate cladding out-of-roundness (≈core out-of-roundness) due to the variation range of the fiber outer diameter corresponds to about 1%. If the out-of-round ratio is simply calculated by the variation range of the optical fiber outer diameter / fiber outer diameter, it is 1.2 μm / 125 μm=0.96%. Using the above-mentioned relational expression analyzed by the finite element method and the conversion formula from multi-refraction to beat length, it can be estimated that the beat length at which the...
Embodiment 3
[0101] Embodiment 3 (no external main factor: optical fiber wire material monomer)
[0102] In Example 3, by making the shape of the heat insulator used in the heating furnace non-uniform in the circumferential direction, the fluctuation range of the optical fiber outer diameter when torsional strain is applied is approximately 125μm ± 0.3μm way to adjust the shape of the insulation. The approximate cladding out-of-roundness (≈core out-of-roundness) due to the variation range of the fiber outer diameter corresponds to about 0.5%. If the out-of-round ratio is simply calculated by the variation range of the optical fiber outer diameter / fiber outer diameter, it is 0.6 μm / 125 μm=0.48%. Using the relational expression analyzed by the above-mentioned finite element method and the conversion expression from multi-refraction to beat length, it can be estimated that the beat length at which the core out-of-round ratio is 0.5% is about 42 m. Therefore, for the torsional deformation c...
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