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|1. (WO2017036030) BEND-RESISTANT FINE OPTICAL FIBER AND MANUFACTURING METHOD THEREOF|
|Applicants:||ZHONGTIAN TECHNOLOGY FIBRE OPTICS CO., LTD
|Title:||BEND-RESISTANT FINE OPTICAL FIBER AND MANUFACTURING METHOD THEREOF|
A bend-resistant fine optical fiber and manufacturing method thereof. The method comprises: preparing a preform via an improved chemical vapor deposition process, and manufacturing an optical fiber via drawing at a certain temperature, wherein a diameter of a cladding layer of the optical fiber is 80 ± 1 μm, a diameter of a coating layer thereof is 155-170 μm; and computing a service life of the optical fiber via an established computation model after the manufacturing. In the present invention, the bend-resistant fine optical fiber is primarily formed by a core layer, a terrace layer, a sunken layer, a cladding layer and a coating layer, and the relative refractive index and radius of each of said layers is reasonably controlled, and a cutoff wavelength is effectively controlled by employing an automatic temperature and tension monitoring procedure during the drawing process, such that the cutoff wavelength and a mode field diameter are maintained in a relatively stable range, and the cutoff wavelength is adjusted upward while the mode field diameter remains stable, thus facilitating a decrease of bend loss of the optical fiber.