A kind of optical fiber preform, multimode optical fiber and preparation method thereof

Abstract

The invention discloses an optical fiber prefabricated part, a multimode optical fiber and a preparation method thereof, which belong to the technical field of optical fiber manufacturing. The openings of the flow controllers of each channel are such that the reactant flows through the segmental control of the flow controllers of each channel and then enters the subsequent deposition process to participate in the deposition reaction to obtain an optical fiber preform. By adding the reactant gas path to control the segmental control of the multi-flow controller with different openings of reactants in the initial stage and the middle stage of deposition to the core layer, it ensures that the core rod is deposited to the edge of the core layer in the initial stage of doping. The stability of the agent flow control improves the control accuracy of the refractive index at the initial stage of the core layer. Due to the increased control stability of the low opening flow rate, it is beneficial to the stability of the reactant during deposition to the core layer, avoiding the disturbance of the unstable reactant gas flow to the core layer deposition stage, and improving the axial uniformity of the mandrel.

Description

technical field [0001] The invention belongs to the field of optical fiber manufacturing, and more specifically relates to an optical fiber preform, a multimode optical fiber and a preparation method thereof, which can optimize the flow control of dopant and the out-of-roundness of the fiber core. Background technique [0002] In recent years, multimode fiber has become a high-quality solution for short-distance, high-speed transmission networks due to its low system cost advantage, and has been widely used in large data centers, local office centers, high-performance computing centers, and storage area networks. . With the general commercial use of 100Gb / s and the steady evolution to 400Gb / s, the demand for high-quality, high-bandwidth performance multimode fiber is becoming more and more urgent. [0003] An optical fiber preform required for producing a multimode optical fiber is prepared by a plasma chemical vapor deposition (plasma chemical vapor deposition, PCVD) proce...

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Problems solved by technology

[0034] Aiming at the above defects or improvement needs of the prior art, the present invention proposes an optical fiber prefabricated part, a multimode optical fiber and a preparation method thereof, thereby solving the problem that the existing gas supply pipeline is connected to a single large-range Ge flow controller limited by a low opening. Due to the influence of fluctuations and instability of the flow rate, the technical problems that have a great impact on the uniformity of the multimode mandrel and the corresponding refractive index distribution at the edge of the mandrel core layer

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