Performance of Optical Fiber Connector
Fiber optic connector performance, first of all optical performance, in addition to consider the optical fiber connector interchangeability, repeatability, tensile strength, temperature and the number of plug and so on.
(1) optical performance: optical fiber connector for the optical performance requirements, mainly the insertion loss and return loss of the two most basic parameters.
InsertionLoss (InsertionLoss) that is connected to the loss, is due to the introduction of the link caused by the link of the effective optical power loss. Insertion loss is as small as possible, the general requirements should not be greater than 0.5dB.
ReturnLoss (ReturnLoss, ReflectionLoss) refers to the connector on the link optical power reflection inhibition, the typical value should not be less than 25dB. Practical application of the connector, the pin surface after a special polishing, you can make the return loss is greater, generally not less than 45dB.
(2) interchangeability, repeatability
Fiber optic connectors are generic passive devices that can be used in any combination for fiber optic connectors of the same type and can be used multiple times, resulting in additional losses typically less than 0.2 dB.
(3) Tensile strength
For the optical fiber connector, generally require its tensile strength should not be less than 90N.
General requirements, fiber optic connectors must be -40oC ~ +70 o C temperature can be used normally.
(5) the number of plug
The current use of fiber optic connectors can generally plug in more than 1000 times.
Note: In the note that the pigtail connector, we often see "FC / PC", "SC / PC" and so on, its meaning is as follows:
"/" The front part indicates the connector type of the pigtail, as described above. "/" Is followed by the fiber optic fiber cross-section process, that is, grinding method. Fiber optic connector end contact with PC, UPC, APC three. UPC - Ultra Physical Contact, the end of the plug body for the super - physical face; APC - Engled Physical Contact, the end of the needle body is the end of the body for the physical end; Angle physical end; the difference between the three in addition to the physical difference, there are echo loss, that is, reflection loss (performance) is not the same.
Consumption than the "PC" to be small, generally used for special needs of the equipment, some manufacturers optical connection device internal jumper is used FC / UPC, mainly to improve the equipment itself, the target. "APC" is used in radio and television and early CATV system, because APC uses the inclination of the end face, can improve the quality of television signals, mainly because the TV signal is analog light modulation, when the connector coupling surface is vertical, the reflected light Return along the original path. As the uneven distribution of the refractive index of the fiber will return to the coupling surface again, although the energy is very small but because the analog signal can not completely eliminate the noise, it is equivalent to the original clear signal superimposed on a weak signal with delay, Optical Fiber Connector Performance on the screen is ghosting. The tip of the pigtail can not return the reflected light along the original path. General digital signals generally do not exist this problem.