Optical fiber alignment method of optical fiber fusion splicer

Optical fiber fusion splicer is mainly used for the construction and maintenance of optical cables in optical communications, so it is also called optical cable fusion splicer. The general working principle is to use a high-voltage arc to melt the sections of the two optical fibers and use a high-precision motion mechanism to gently advance the two optical fibers into one to achieve the coupling of the optical fiber mode fields. Therefore, the degree of alignment of the two optical fibers determines the quality of optical fiber fusion splicing. The higher the degree of optical fiber alignment, the better the quality of optical fiber fusion splicing.

There are two types of alignment methods for fiber fusion splicers: core alignment and cladding alignment

Core alignment:

The core-aligned fiber fusion splicer adopts a core detection system (CDS), sometimes called a profile alignment system (PAS), built-in 6 motors and 2 CCD cameras. The system performs fiber alignment through the side projection. The alignment process of the optical fiber is: the light emitted by the red light source inside the fusion splicer illuminates the optical fiber through the reflector, enters the objective lens, and then converges, and then images on the Charge Coupled Device (CCD) of the X and Y cameras. Due to the different refractive indexes of the core and the cladding, the grayscale imaged on the Charge Coupled Device (CCD) is different, forming bright and dark stripes, which are aligned by a certain algorithm.

Cladding alignment:

The cladding-aligned fiber fusion splicer has built-in 2 motors and a camera. The fiber alignment process is: put the fibers to be spliced in a fixed V-shaped groove, and then use the camera to adjust and fix the V-shaped according to the concentricity of the fiber. The position of the slot makes the cladding of the two optical fibers aligned, and finally two motors are used to advance the optical fibers for electrode discharge welding.

The cladding-aligned fiber fusion splicer requires high precision for fixing the V-groove, and it must be clean and pollution-free. In addition, since this fusion splicer is aligned with the cladding of the optical fiber instead of the optical fiber, the optical fiber loss after fusion splicing is also relatively large. In general, the cladding-aligned fiber fusion splicer is suitable for short-distance transmission of single-mode and multi-mode fiber fusion splicing applications.


The cladding-aligned fiber fusion splicer is mainly used in occasions where the quality of fiber fusion splicing is not too high, such as fiber to the home, and the price is relatively cheap. The core-aligned fiber fusion splicer is equipped with a precision six-motor alignment system including a focus motor, and a specially designed optical lens and software algorithm, which can accurately identify the fiber type and automatically select the matching splicing mode for splicing , In order to ensure the quality of splicing; its technical content is relatively high, in addition to being used for fiber to the home, it can also be used for trunk fiber splicing, so the price will be relatively high.

Post time: 2021-01-27


Lomoveishiy – Finland

I needed those to connect my PC on the third floor to have internet access in that room, and ISP installed their modem on the first floor only. After dropping fiber patch cables, plugged in all cables into these media converters at both sides, and link came up instantly. Was much easier than I thought!

Raymond – USA

Great experience – units worked straight out of the box – just needed plug in cables and we were done. I also like the possibility to enable jumbo frames, while we do not have a need for this feature at the current moment it’s great to have this option.

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