Production method of optical fiber preset core insert and positioning device

Abstract

The invention relates to a production method of an optical fiber preset core insert, which has the characteristics that the insertion loss of the optical fiber core insert in the production process can be detected by an instrument. The technical scheme is as follows: the production method of the optical fiber preset core insert is characterized by comprising the following steps: (a) horizontally fixing a ceramic core insert on a workbench of a core insert grinder; (b) sheathing a protective sleeve on a bare optical fiber which is not cut; (c) inserting the bare optical fiber into an optical fiber hole from the tail part of the ceramic core insert; (d) starting the core insert grinder to grind the end surface of the head part of the ceramic core insert and the end surface of the bare optical fiber; (e) conducting return loss test on a light guiding surface; (f) if the test result is disqualified, repeating the steps (d-e) until the test is qualified; and (g) if the test result is qualified, stripping the protective sleeve of the bare optical fiber, and taking the core insert out of the core insert grinder, and preserving a tail fiber with a certain length, and cutting with a cutter.

Description

technical field [0001] The invention relates to the field of optical fiber technology, in particular to a production method for an optical fiber preset ferrule and a positioning device for producing an optical fiber preset ferrule. Background technique [0002] With the rapid expansion of FTTH (fiber-to-the-home) in China, as an indispensable connection device for its terminals, the number of optical fiber quick connectors (or field connectors) is also increasing; As the core component of the optical fiber quick connector, its conventional production process is: first cut the bare optical fiber into a small section, then insert it into the hole in the axial direction of the ferrule and fix it, and then grind the end face of the ferrule head to make the ferrule The end face of the core and the end face of the bare fiber are ground into the same plane (forming a standard light guide surface); the above production method faces the following problems: [0003] 1. Since the bare...

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Problems solved by technology

[0003] 1. Since the bare optical fiber has been cut, only a small section (3-5 mm) is exposed from the end face of the ferrule tail after grinding; because the exposed length of the optical fiber is too short to use the optical fiber loss measuring instrument, it is difficult to correct after production. The insertion loss of the ferrule and the minimum value of the insertion loss of each ferrule surface are inspected (if the ferrule surface is unqualified, it cannot be identified by the instrument), which has virtually caused the insertion loss in the production of quick connectors to be too large, which cannot improve the qualified Rate;

[0004] 2. The bare optical fiber itself is relatively fragile, and it is easy to be damaged during production. Once the bare optical fiber in the optical fiber preset ferrule is damaged, it cannot be repaired, resulting in a decrease in the pass rate;

[0006] 4. The aperture of the ceramic ferrule of the optical fiber preset ferrule is larger than the outer diameter of the optical fiber. Manual insertion cannot guarantee the alignment of the optical fiber, and the final cut bare optical fiber surface will form a certain angle.

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