Optical fiber preform and preparation method thereof

Abstract

The invention belongs to the technical field of optical fiber communication. The invention provides an optical fiber preform and a preparation method thereof. The preparation method comprises the following steps: introducing hydrogen, oxygen, silicon tetrachloride and germanium tetrachloride into a blast burner, burning to generate a first deposit to form a first deposition layer, replacing germanium tetrachloride with silicon tetrafluoride, burning to generate a second deposit to form a second deposition layer, sintering an obtained hollow powder core rod, and stretching to obtain an extendedhollow core rod, and heating to enable alkali metal halide to be deposited on the inner surface of the extended hollow core rod and diffused into the extended hollow core rod to obtain an alkali metal halide doped hollow core rod, depositing silicon dioxide on the alkali metal halide doped hollow core rod by adopting an OVD process, and sintering to obtain the optical fiber preform. The preparation method of the optical fiber preform is simple and convenient to produce and easy to industrialize, the optical fiber drawn by the optical fiber preform is low in loss under a small bending radius,the connection loss is effectively reduced, the stable operation of a communication system is ensured, OSNR in optical fiber communication is effectively improved, and the transmission quality is further improved.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication, and in particular relates to an optical fiber preform rod and a preparation method thereof. Background technique [0002] Optical fiber communication has the characteristics of large transmission capacity, long transmission distance, and fast transmission speed, and is widely used in optical communication systems such as long-distance trunk lines, local area networks, and access networks. In recent years, with the explosive growth of IP traffic, the communication optical network is moving towards the next-generation system, and the construction of optical fiber infrastructure with huge transmission capacity is the basis of the next-generation network. [0003] In the construction process of ultra-dense networking, the main difficulties in the construction of the access layer are the dense optical fiber connection of massive newly built macro base stations and indoor micro base...

AI Technical Summary

Problems solved by technology

[0003] In the construction process of ultra-dense networking, the main difficulties in the construction of the access layer are the dense optical fiber connection of massive newly built macro base stations and indoor micro base stations, and the problem of integrated photoelectric simultaneous transmission of base stations under certain circumstances.

The complex wiring environment of the access section, especially when the fiber optic cable is wired indoors, the bending loss of the cable will affect the overall link transmission performance

On the other hand, considering the diversity and openness of the 5G supply chain and core components in the future, the direct power supply method using the active Ethernet (POE) solution may be limited in the future, and the optical composite cable may be more widely used in the future. Applications

[0004] In the Chinese invention patent CN201810444280.3, a high germanium-doped core rod is prepared by VAD, and the refractive index difference between the core layer and the cladding layer is increased to improve the bending resistance of the optical fiber. However, as the content of germanium in the core layer increases, the attenuation of the optical fiber also increases. , the attenuation coefficient of the optical fiber preform prepared by this process is not ideal after drawing

In the Chinese invention patent CN108002698A, the PCVD process is used to prepare the core rod of the optical fiber preform, and the core rod is doped with alkali metal in the diffusion furnace to prepare the low-loss core rod. The production efficiency of the optical fiber preform rod prepared by this technology is limited by the size of the deposition substrate tube, and the production efficiency is low. ,high cost

Therefore, it is still difficult to produce an optical fiber preform with excellent attenuation coefficient and excellent bending resistance.

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