Large-size low-loss optical fiber preform and manufacturing method thereof

Abstract

The invention relates to a large-size low-loss optical fiber preform and a manufacturing method thereof. The manufacturing method comprises the following steps: preparing an optical fiber core rod byusing a VAD process, wherein the optical fiber core rod comprises a core layer and an inner cladding layer from interior to exterior; depositing a barrier layer loose body at the outer part of the optical fiber core rod by a OVD process, and then conducting sintering treatment, so as to obtain a synthesized core rod; and combining the synthesized core rod and a continuous fusion sleeve by a RIC process, so as to form the large-size low-loss optical fiber preform. The prepared large-size low-loss optical fiber preform has a diameter up to 205 mm, the fiber length of a single preform can reach 3200 km, the attenuation of an obtained optical fiber at 1310 nm is 0.316 dB/km or less, the attenuation coefficient at 1383 nm is 0.278 dB/km or less, the attenuation coefficient at a wavelength of 1550 nm is 0.174 dB/km or less, the mode field diameter at a wavelength of 1310 nm is 8.9-9.3 [mu]m, and the optical cable cut-off wavelength of the optical fiber is 1270 nm or less.

Description

technical field [0001] The invention relates to a large-size and low-loss optical fiber preform and a manufacturing method thereof, belonging to the field of optical fiber preform manufacture. Background technique [0002] With the development of the economy, the optical fiber industry has entered a new round of high-speed development period, and the optical communication industry has shown a booming situation. Under such a good situation, realizing the localization and scale of large-size low-attenuation optical fiber preform as soon as possible is not only the need for the development of China's optical fiber industry, but also the only way for domestic optical fiber enterprises to survive. [0003] At present, the process of producing optical fiber preforms mainly adopts a two-step method, that is, the core rod of the prefabricated rod is manufactured first, and then the cladding is manufactured outside the core rod. Mandrel manufacturing technology mainly has the follow...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is: in order to solve the technical problem that the existing technology cannot manufacture a large-size low-loss optical fiber preform, especially the large-size low-loss optical fiber preform with a continuous melting sleeve as the outer cladding, a A large-size low-loss optical fiber preform with continuous melting sleeve as outer cladding and its manufacturing method

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