Inner cladding depressed type multimode optical fibre prefabricated rod

Abstract

The present invention relates to an optical fibre prefabricated bar and its production method. The waveguide structure of said invented optical fibre prefabricated bar is as follows: the range of depressed depth d is: d is greater than or equal to -1.00% and less than or equal to -0.001%; the ratio range of depressed width W and preform core diameter 2a is: w / xa is greater than or equal to 0.01% of less than or equal to 5.00%, and the core starting point height h range is: h is greater than or equal to -1.00% or less than or equal to 1.00%. Said invention utilizes the increment of depressed depth and depressed width of the multimode fibre and decrement of doped amount of GeCl4 in the preform to design an inner cladding recessed multimode optical fibre preform.

Description

technical field [0001] The invention relates to an optical fiber preform rod and a manufacturing method in the field of optical fiber manufacturing, in particular to an inner cladding concave multimode optical fiber preform rod and a manufacturing method. Background technique [0002] The manufacturing technology of optical fiber preform is mainly divided into in-tube method and out-of-tube method. The external methods include OVD (external vapor deposition) and VAD (vapor axial deposition) processes, and the internal methods mainly include PCVD (plasma chemical vapor deposition) and MCVD (modified chemical vapor deposition). The PCVD process has high flow control accuracy, thin deposition thickness of each layer, precise design and manufacture of preform refractive index, continuous and smooth preform refractive index profile, and can manufacture various complex waveguide structures, representing multi-mode State-of-the-art optical fiber. Multimode fib...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a concave multimode optical fiber preform with an inner cladding by designing the depth and width of the multimode optical fiber and optimizing the process, which can reduce the amount of GeCl in the preform. 4 The doping amount can reduce the Rayleigh scattering of the system and reduce the attenuation of the multimode fiber; through the waveguide structure design of the concave inner cladding, the optimal doping amount is found to reduce the Rayleigh scattering, and the attenuation of the 850nm window is large The amplitude is reduced, eliminating the influence of the hydroxyl peak on the entire substrate, especially the 1385nm loss, and the attenuation of the 1300nm window is also reduced, optimizing the transition performance of the core layer and the cladding interface in the waveguide structure, reducing the interface stress, and reducing the waveguide loss to achieve overall The purpose of reducing the attenuation of multimode fiber, the bandwidth performance of the fiber is optimized, and the overall performance of the fiber product is improved

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