| CPC G02B 6/06 (2013.01) [C03B 37/028 (2013.01); C03B 37/029 (2013.01)] | 17 Claims |
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1. A method for fabricating a fiber optic image inverter with an ultra-short twister, wherein the method comprises the following steps:
(1) surrounding pipe fiber drawing: drawing a round glass rod with a low refractive index and a high strain point temperature into the surrounding pipe fiber with Φ1.6-2.0 mm;
(2) filling glass fiber drawing: drawing a glass rod with a high refractive index and a high transmittance into the filling glass fiber;
(3) casing pipe absorption fiber drawing: preparing a light absorption glass with a light absorption property into a light absorption glass rod, matching the light absorption glass rod and a cladding glass pipe, and then drawing into the casing pipe absorption fiber;
(4) mono fiber drawing: uniformly surrounding an outer side of the cladding glass pipe with the surrounding pipe fiber, then matching a core glass rod with a high refractive index and the cladding glass pipe surrounded with the surrounding pipe fiber, and then performing drawing of the mono fiber to obtain the drawn mono fiber, wherein a diameter of the mono fiber is the same as a diameter of the casing pipe absorption fiber;
(5) multi fiber drawing: arranging the drawn mono fibers into a multi assembly rod with an orthohexagonal cross section, wherein the number of mono fibers on each side in the multi assembly rod is N, replacing one mono fiber arranged at a center of the hexagonal multi assembly rod with the casing pipe absorption fiber, and filling and inserting the filling glass fibers into a hole of the multi assembly rod; followed by drawing the multi assembly rod into the multi fiber;
(6) multi-multi fiber drawing: arranging the drawn multi fibers into a multi-multi assembly rod with an orthohexagonal cross section, then drawing the multi-multi assembly rod into the multi-multi fiber, and then cutting the multi-multi fiber with a fixed length to be arranged into a fiber assembly bundle;
(7) heat press fusion: putting the arranged fiber assembly bundle in a heat press fusion mold, then putting the heat press fusion mold in a heat press fusion furnace, performing heat press fusion according to a designed compression ratio of the fiber assembly bundle before and after heat press fusion, and obtaining a fused boule after heat press fusion; and
(8) twisting operation: subjecting the fused boule to cutting, rounding and grinding machining treatments to obtain a fiber optic image inverter block, and subjecting the fiber optic image inverter block to a 180° twisting operation in an ultra-short high-temperature twisting furnace to obtain a fiber optic image inverter with an ultra-short twister;
wherein a heating furnace body in the ultra-short high-temperature twisting furnace has a width ranging from 3 mm to 4 mm, a distance from the heating furnace body to a surface of the fiber optic image inverter block ranges from 1.0 mm to 2.5 mm, and twisting operation time for twisting the fiber optic image inverter block by 180° ranges from 2 minutes to 9 minutes;
wherein a composition for fabricating a surrounding pipe fiber is composed of the following components by mole percentage content:
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