8/24/2023 0 Comments St connector fiberThe pre-installed fiber stub in the connector has been cleaved at the factory. The technician strips the jacket and buffer coating from the fiber, and uses a special tool called a cleaver to break off the fiber to within two degrees of 90 degrees (perpendicular), at a specific length. These have been assembled at the factory, and have a quality of polish superior to any that can be performed in the field. These connectors have a pre-polished fiber stub installed in the ferrule. The cleave-and-crimp connection method is gaining in popularity, particularly among security technicians, where small numbers of connectors are usually installed. An advantage is that the connectors are the least expensive, although the need for other consumables, such as glue, syringes, and polishing paper reduces the cost savings. There are many steps towards completion, and any mistake will require the technician to start over at the beginning. Glue and polish connectors require AC power for the oven and a flat surface on which to polish. ST and SC connectors can be mated with special adapters. After scribing, the fiber stub is removed with fingers, and the fiber is gently polished, using two or three steps of successively finer polishing papers, a polishing puck, and a flat surface. Once the connector is cool enough to handle, a jewel-tipped tool called a scribe is used to gently scratch the excess fiber sticking out of the ferrule. in the oven, the connector is removed for cooling. The fiber is inserted into the connector body, and this assembly is placed into an oven, which heats the connector, setting the epoxy glue. After stripping the buffer coating and the 900-micron plastic jacket from the fiber end, epoxy glue is injected into the body of the connector so that a small amount flows out of the ferrule end. It is also the slowest and requires the most training and care by the technician to achieve consistently good connectors. Glue and polish is the most common method of connector installation. Well-trained technicians can install connectors with consistency and a high yield of good-quality connectors. When choosing an installation method, the installation company should consider costs for tools, time required to perform connections, and the level of technician training necessary. These three methods are glue and polish, cleave and crimp, and fusion splicing pigtails. There are three common methods for installing connectors, and any of these methods can be used to achieve high-quality, low-loss connector sets. It is important to note that connectors from different vendors are interoperable with those from another vendor, provided that the type of fiber (multimode or singlemode) is the same and the connectors were installed properly. There are many different manufacturers of these two types of connectors. SC connectors are called stick and click in reference to their insertion movement.Īs both connector types have a 2.5mm ferrule, they can be mated together using hybrid adapters, which are readily available from fiber optic supply houses. These connectors are inserted by aligning the post with the adapter slot, and pushing the connector in until it clicks. SCs are popular in computer networking and telephony, and comprise approximately 90 percent of the 10 percent of the connector population that isn’t the ST type. SC connectors have a square body, an alignment post, and a 2.5mm ferrule. Connectors are tested by measuring the optical loss of a pair of connectors and their mating adapter. The fiber industry often refers to two connectors with their adapter as a connector set or pair. The quality of an individual connector cannot be measured in the field, as it is impossible to determine how well a single connector passes light without inserting it into an adapter, and inserting another connector that receives the light energy. Such movement can cause dramatic increases in optical loss, or may damage the connector to which it is mated within the adapter. It is also important to secure the fiber within the connector to prevent pistoning, which is when a fiber moves slightly back and forth within a connector. These securing methods provide protection for the connector in the event that the cable entering the back of the connector body is inadvertently tugged or pulled. A stripped (buffer coating removed) fiber end is securely held within the connector body, either with an epoxy glue or mechanical crimp. Two fiber optic connectors are mated with an adapter.
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