Profile Alignment (Core alignment) : Active alignment of the cores, or core alignment fusion splicing, is currently the most commonly used fusion splicing technology. Although more expensive and complex technology, it is also more powerful and flexible, and less sensitive to variations in the cable.
The splicer uses various methods to see the fibres. It uses that input to have precisely controlled motors move the fibres along their X (horizontal), Y (vertical) and Z (in and out) axes until they are aligned
The PAS System "sees" the core by detecting the refraction of light caused at the core-cladding interface. Images are taken in two orthogonal planes so that the core can be located precisely
The splicer uses a V-groove to hold the fibres in place and moves the V-groove along the X, Y, axes until the cores are aligned in both views
Cladding alignment is a passive alignment that relies on the accurate pre-alignment of fibre V-grooves that grip the outer surface or cladding of the fibre. Fibres are adjusted inwards and outwards. The advantage of this method is that the technology required is low cost and fast, so it is still utilised on low-cost field fusion splicers and ribbon splicers. Fibre position, core-cladding eccentricity and mode field diameter (MFD) influence the effectiveness of cladding alignment and subsequent splice performance. Fibre position is influenced by contamination on the fibre or V-grooves. While the operator controls this parameter, core-cladding eccentricity and MFD are fibre manufacture parameters, and typically come into consideration when splicing new to old fibres and also dissimilar fibres such as singlemode G652.D to G657.A
Fusion splicing is the act of joining two optical fibers end-to-end using heat. The goal is to fuse the two fibers together in such a way that light passing through the fibers is not scattered or reflected back by the splice, and so that the splice and the region surrounding it are almost as strong as the virgin fiber itself. The source of heat is usually an electric arc, but can also be a laser, or a gas flame, or a tungsten filament through which current is passed.
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