(1) jumpers.
  The two ends of an optical fiber are installed on the plug, called jumpers. The connector plug is a special case of jumpers, that is only equipped with a plug at one end of the optical fiber. Engineering and instrumentation applications, the extensive use of various models, jumpers, optical fiber jumper plug specifications of the two may be the same model, it can be different models. Jumpers can be single, it can be a multi-core. Jumper price is mainly determined by the quality of the joint. Hence the price is also quite different. In the selection of jumpers, quality and cheap to choose is good, but be sure not to buy quality products at the lowest.

(2) converters.
  The fiber optic connectors are connected together, so that the device is turned on is called the optical fiber converters, converters, commonly known as the flange. With CATV system most is FC type connector; SC-type connector due to the advantages of easy to use, inexpensive, can be intensive installation, prospects are good, apart from extraterrestrial, ST type connectors are also a number of applications.

  a. FC-type connector. FC connector is a threaded connection, external components using metal materials produced by the circular connector. It is the main species used in our country, widely used in optical cable network system; its strong tensile strength, able to adapt to the requirements of various engineering.
b. SC-type connector. SC-type connector shell is made of engineering plastics, rectangular structure, easy to install dense; without threaded connection, you can directly plug a small operating space. Utility installation in high density, easy to use.

  c. ST type connectors. ST type connectors are keyed bayonet locking structure to ensure the accuracy of the connection.
  Although the appearance of these three connectors are not the same, but the core components - the sleeve is the same. Sleeve is a precision machining sleeve (there are two kinds of openings and do not open), two pin docking and ensure alignment of two optical fibers in the sleeve. The principle is: the outer cylindrical surface of the pin between the reference plane, pin and sleeve tight fit; when the core of the fiber coaxial outer cylindrical surface of the outer cylinder and the end of the pin, and a sleeve when bore machining is very precise, two pins in the sleeve docking, to achieve alignment of the two optical fibers.

  Below talk about the details of the sleeve. Sleeve there are two structures: the opening of the sleeve and the sleeve is not opening. a. Opening sleeve. Opening sleeve in the connector most commonly used, its main dimensions: diameter: Ф3.2 ± 0.01mm, the inner diameter Ф2.5 ± 0.02mm, the inner hole finish: ▽ 14; elastic deformation: less than 0.0005mm, pins insertion or removal of the sleeve force: 3.92-5.88N. Opening sleeve with high elastic material, such as phosphor bronze, beryllium and zirconium oxide ceramics, when the pin inserted into the sleeve, the sleeve of the pin holding force should remain constant, these three materials produced by the sleeve in both applications, but the majority of beryllium and zirconium oxide ceramics. b. Not open sleeve. Not opening the sleeve in the connector fewer applications, application of fiber connections and active devices in more dimensions which substantially coincides with the opening of the sleeve. Except that its inner hole diameter ф2.5 + 0.0005mm, i.e., larger than the outer diameter of 1 m pins; so that the pins can be smoothly inserted into both at the same time not be too large a gap, optical fiber with guaranteed active devices (e.g. when the laser tube, detector) connection, repeatability, interchangeability achieve the target requirements.

  The three types of converters, you can connect to the same type of plug connection for different types of plugs, you need the following three converter. Namely: FC / SC Converters - FC and SC-type connector for interconnection; FC / ST converter -, SC / ST type converter plug for FC and ST Interconnection - for SC and ST plug interconnect. Multiple correlation between the flange on the market price level, in fact, finish these, the reader should understand why they go.

(4) the converter.
  To a particular type of connector plug is converted into another type of device called a transducer, the device consists of two parts, half of them for a type of converter, the other half for the other types of plugs. When using a model to plug into the same type of converter, plug it into the other models. In practical engineering applications often encounter this situation, that there is some type of plug on hand, and the instrument or system is another type of converter, not good enough to each other, does not work. If equipped with this type of converter, the problem is solved. For FC, SC, ST three connection device, to be completely interchangeable, there are the following six converters. SC-FC, the SC connector is converted into the FC plug; ST-FC to ST connector is converted into the FC plug; FC-SC to FC connector is converted into SC plug; FC-ST to FC connector is converted into ST connector, SC-ST to SC ST connector plug converted; ST-SC will be converted into SC ST connector plug.

  Fiber actually an active connection in addition to the above activities connectors, if it is an emergency repair broken cable, but not on hand welding machine, usually a mechanical connector (also known as Fast wiring sub) process. Utilizing a fine glass tube to locate with a mechanical device to fasten the optical fiber, optical fiber using the first cut on the end face of the cleaning process, the fiber ends to retain 6-8mm, then the two end faces of the optical fiber in a glass of fine after aligning the central tube clamping nut is screwed tight at both ends to achieve a reliable connection of the fiber. Joined by mechanical head length of about 40mm, a diameter of not more than 5.7mm, the average is less than 0.4dB insertion loss, return loss greater than 50dB, is greater than the tensile strength of 1.25kg, more importantly, is extremely short assembly time, indeed a rapid repair an indispensable tool.

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