Monday, February 17, 2020

These incorrect fiber alignments occur for two reasons

The occasional need to interconnect two different fibers and the differences in the manufacture of fibers of the same nominal dimensions. The differences in manufacturing are only a few microns and contribute to generating only small amounts of optical loss, but the loss caused by incorrect alignments will be directional and will cause a greater optical loss when transmitted from the larger nuclei of the fibers to other smaller ones.

Since there are several types of single-mode fibers and two types of multimode fibers (50/125 and 62.5 / 125) that are commonly used today, and two other fibers (100/140 and 85/125) that were occasionally used in the Lastly, it is sometimes necessary to connect different fibers or use fibers of one size in systems designed for other fiber sizes. If you connect a smaller fiber to a larger one, the optical loss that occurs at the time of coupling will be minimal, but connecting larger fibers to smaller ones will cause a significant optical loss in the joint.
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In general, the usual optical loss of single-mode or multimode fiber connectors, factory polished by means of bonding or polishing techniques, is less than 0.3 dB. Very few installers face field
termination of single-mode fiber, in general, they fuse the factory- connected fiber cable ( pigtail )
to the fibers, since it is not so easy to polish the single-mode fiber connector when performing field termination, especially in terms of reflectance. Multimode fiber field terminations are common, as experienced installers can obtain results comparable to factory terminations with bonding or polishing techniques. The field termination of pre-polished or splicing connectors, made with a precision cutter (those manufactured for the fusers), can produce reasonable results near 0.5 dB, while a common cutter usually generates an optical loss from the range of 0.75 dB. Very few industry standards set limits on the level of optical loss of the connector, but the TIA 568 standard requires that the optical loss in the connection is less than 0.75 dB and the optical loss in the splice at 0.3 dB. They are high figures of loss but that will allow the use of pre-polished or splicing connectors and most mechanical

splices.

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