Optical fiber and manufacturing method thereof

A manufacturing method for an optical fiber, comprising

• using a hollow glass tube as a target rod, adopting a vapor phase axial deposition (VAD) to make a core rod loose body with a core layer loose body, a silicon dioxide isolation layer, and a cladding layer loose body sequentially arranged from inside out, and using a first blowtorch, a second blowtorch, and a third blowtorch for deposition;
• forming the core layer loose body using the first blowtorch, wherein gases entering the first blowtorch are H2, O2, Ar, and SiCl4;
• forming the silicon dioxide isolation layer using the second blowtorch, wherein gases entering the second blowtorch are H2 and O2, a flow rate of H2 entering the second blowtorch is in a range of 12-15 L/min, and a flow rate of O2 entering the second blowtorch is in a range of 10-12 L/min;
• forming the cladding layer loose body using the third blowtorch, wherein gases entering the third blowtorch are H2, O2, Ar, SiCl4, and CF4;
• and wherein the hollow glass tube comprises a hollow tube body and an open deposition tip communicating with a tail end of the hollow tube body, and the core layer loose body is connected with the open deposition tip;
• dehydrating the core rod loose body, wherein a dehydration atmosphere enters the core layer loose body through the hollow glass tube and penetrates from an outside to an inside of the cladding layer loose body, and a dehydrated core rod loose body is obtained;
• sequentially sintering, extending, and washing corrosively the dehydrated core rod loose body and forming an outer cladding layer on a surface to obtain a preform;
• and
• drawing the preform to obtain an optical fiber;
• wherein the open deposition tip is conical, a length of the open deposition tip is in a range of 20-22 mm, a hole with a diameter in a range of 6-7 mm is provided at the open deposition tip, an inner diameter of the hollow tube body is in a range of 30-31 mm, and an outer diameter of the hollow tube body is in a range of 32-34 mm;
• wherein a pressure at which the dehydration atmosphere enters the core layer loose body through the hollow glass tube is in a range of 80-90 psi, and a pressure at which the dehydration atmosphere penetrates from an outside to an inside of the cladding layer loose body is in a range of 35-45 psi.