Optical fiber preform and preparation method thereof

An optical fiber preform and core rod technology, which is used in cladding optical fibers, glass manufacturing equipment, optics, etc., can solve the problem of simultaneous optical and optical simultaneous interpretation of base station construction at the access layer, the attenuation coefficient of optical fiber preforms is not ideal, and the bending resistance of optical fibers Preform difficulties and other problems, to achieve the effect of improving transmission quality, small attenuation coefficient, and small attenuation amplitude

CN111847867AActive Publication Date: 2020-10-30FUDAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-10-30

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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.
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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...

Examples

Embodiment 1

[0059] In this embodiment, the preparation method of the optical fiber preform is described in detail.

[0060]Step S1, powder mandrel deposition process: fix a ceramic rod with a diameter of 20mm on the external vapor deposition equipment, the ceramic rod moves axially at a speed of 180mm / min, and rotates around the axis at a speed of 30rpm, and the blowtorch is located under the ceramic rod , the nozzle of the blowtorch is 150mm away from the outer surface of the ceramic rod, and then the four gases are fed through different pipes according to the flow rate of hydrogen 80L / min, oxygen 40L / min, silicon tetrachloride 50g / min, and germanium tetrachloride 400mg / min. Blowtorch, hydrogen, oxygen, silicon tetrachloride and germanium tetrachloride burn at the blowtorch port to produce the first deposit, the first deposit is deposited on the outer surface of the ceramic rod, after measuring the thickness of the first deposit layer reaches 30mm, Stop feeding germanium tetrachloride, t...