Fiber optic box is used as a waveguide for light, mainly for high-speed data communication and transmission of images to video equipment. The boxs are made from glass fibers usually manufactured from silica, but other materials also can be used for special purposes. Fiber-optic terminations happen at the end of a box where it connects to a piece of equipment or to another box. The connection of two boxs is called a joint. The fiber optic box terminal connected to a device is called a connector.
boxs are manufactured in two types. Single-mode box is generally a long-distance box, is thinner and is more difficult to work with, but it transmits light better and is capable of higher throughput. Multi-mode boxs are thicker and are mainly used for short-range applications such as computer networks in buildings. The fiber-optic terminations for both types of box are similar, but most terminations for single-mode box take place in a factory, whereas multi-mode terminations often take place in the field.
Single-mode fiber-optic terminations that take place in the field are often repairs necessitated by damage to the box or its connectors. Splices can rejoin and repair damaged fiber-optic boxs. Multi-mode boxs can be spliced, but this is usually unnecessary. A multi-node box is shorter, so a broken box can often be easily replaced, and splicing is unnecessary. The techniques for polishing single-mode and multi-mode box are different, and many fiber-optic box installers lack the training for making single-mode terminations.
Most fiber-optic terminations to connectors made in the field will be on multi-mode box and will use some type of adhesive termination. Adhesive terminations use epoxy to hold a box in place inside the connector. Each fiber-optic connector manufacturer supplies its own recommended epoxy adhesive and the method of using it. Another method places the epoxy inside the connector at the factory. Heat the connector to melt the adhesive, and then place the fiber optic box inside the connector.
Crimp connectors are less reliable for fiber terminals, but the advancement of these types of connectors makes them viable alternatives to bonded connectors. The ends of the box still must be cut and polished, but the box is held in place by a mechanical crimp rather than by epoxy glue. One advantage of the crimp connector is that it does not have to wait for the epoxy adhesive to harden.