A manufacturing process of high temperature resistant optical fiber
A manufacturing process and high temperature resistant technology, applied in cladding optical fiber, optical waveguide and light guide, etc., can solve problems such as unsatisfactory reliability, and achieve the effect of simplifying the manufacturing process
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Embodiment 1
[0018] The present invention comprises the following steps in turn,
[0019] (1) Use a graphite furnace to melt and draw the light rod, wherein the heating temperature is 1700-2200°C; among them, the light rod used for wire drawing can be different types of light rods, and its outer diameter ranges from 45 to 200mm. The speed is 200~1500m / min.
[0020] (2) Annealing and cooling after melting and drawing, and then entering a single-layer coating mold for one-time coating of acrylic resin coating to obtain an optical fiber. The paint is injected from the tank into the mold by air pressure control. Optical fibers with different coating thicknesses correspond to different coating outlet die sizes to ensure the accuracy of the coating size.
[0021] (3) Curing the optical fiber coated with acrylic resin coating with ultraviolet light;
[0022] (4) Use the automatic take-up device to wind the optical fiber on the optical fiber reel to complete the manufacture of high temperature ...
Embodiment 2
[0027] In Embodiment 1, the fiber type is a high temperature resistant G.652D single-mode fiber. A single-mode optical fiber rod with a diameter of 180mm or 200mm is melted in a high-temperature induction graphite furnace at 2200°C, and enters a single-layer coating mold at a drawing speed of 1000-1500m / min, and is coated with high-temperature resistant acrylic resin to a diameter of 200um. The mode field diameter of the optical fiber is 9.2um at 1310 wavelength, and the attenuation is less than 0.4dB / km; the diameter of the glass cladding is 125um; the diameter of the acrylic resin coating is 200um, and the coating thickness on one side is 37.5um. The typical value of the fiber Nd is 22, which can provide a commercial segment length of more than 60km. The weight loss rate of the optical fiber is less than 5% at 150°C; the added value of attenuation is less than 0.2dB / km; it can guarantee long-term use at 150°C and short-term use at 200°C for more than 7 days.
Embodiment example 3
[0029] In Embodiment 1, the fiber type is a high temperature resistant large core diameter energy transmission fiber. A light rod with a diameter of 60mm is melted and drawn in a high-temperature graphite furnace at 2100°C. The diameter of the glass core layer is 200um; the diameter of the glass cladding is 220um. At a wire drawing speed of 10-50m / min, it enters the coating mold, and one side is coated with a high-temperature resistant acrylic resin with a thickness of 40um and a final coating diameter of 300um. The optical fiber has a large light-receiving area and light-receiving incident angle, and its typical numerical aperture NA is 0.37; attenuation at 850nm wavelength is less than 12dB / km.
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Abstract
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