A device and method for preparing bending-resistant low water peak single-mode optical fiber by an external method

Abstract

The invention relates to a device and a method for preparing a bending-resistant and low-water-peak single-mode fiber with an outside method. The device comprises a rotary lifting suspender and a reaction chamber, wherein an air inlet is formed in one side of the reaction chamber, a suction opening is formed in the other side of the reaction chamber, and a core spray lamp and cladding spray lampsare arranged in the reaction chamber respectively by corresponding to the rotary lifting suspender; the device is characterized in that the cladding spray lamps comprise an inner cladding spray lamp and an outer cladding spray lamp arranged above the inner cladding spray lamp, and the inner cladding spray lamp is arranged above the core spray lamp. The device is used for preparing double claddinglayers with different concave degrees, refractive index distribution distortion of a section due to residual stress in the fiber after an optical fiber perform is drawn and cooled into the fiber froma high-temperature melting state is weakened, and quality of a depositional core is improved; with adoption of double-cladding deposition, the core is coated with thicker inner cladding and outer cladding outside, and the erosion effect of external hydroxyl ions on the core can be reduced to minimum, so that the fiber after drawing is on a low-water-peak level.

Description

technical field [0001] The invention relates to a device and method for preparing bending-resistant low-water-peak single-mode optical fibers by an out-of-tube method, and belongs to the technical field of optical fiber base material manufacturing. Background technique [0002] In the current mainstream rod-making process, the base material of the optical fiber preform is mainly produced by the vapor deposition method. The vapor deposition method is divided into an external method and an internal method, and the internal method mainly includes the plasma chemical vapor deposition method (Plasma Chemical Vapor Deposition, referred to as PCVD) and modified in-tube chemical vapor deposition (Modified Chemical Vapour Deposition, MCVD for short); outside the tube mainly include: Outside Vapour Deposition (OVD for short) and Vapor Axial Deposition (Vapour Axial Deposition, Abbreviated as VAD). The extra-tube method is favored by major manufacturers due to its fast deposition spee...

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Problems solved by technology

[0004] The cladding of the optical fiber preform is inevitably subjected to external forces during drawing, so the traditional pure silica cladding technology will cause a certain amount of distortion in the cross-section of the obtained optical fiber relative to the initial preform, which will affect the transmission performance and performance of the optical fiber. Bending performance

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