2012年5月31日星期四

12 Core Bundle Pigtail

Pigtail known as pigtail cable, only one end of the connector at the other end is the core of the breakage of a fiber optic cable, connected by welding, and other fiber optic cable core, often appear in the fiber optic terminal box patch panel is used to connect fiber optic cable fiber optic transceiver (also used in the coupling, jumpers, etc.).
Divided into multimode pigtail single-mode pigtail pigtail: multimode pigtail orange, a wavelength of 850nm, the transmission distance is 500m-2KM, for short-range connectivity. Single mode pigtail is yellow, there are two wavelength 1310nm and 1550nm, transmission distance of 10km-40km and 40KM-120KM.
Fiber splicing technology:
Fiber splicing technology Splice machine to connect the optical fiber and optical fiber or fiber pigtail fuse together into a whole, the bare fiber optic cable and optical fiber pigtail, the pigtail is a single optical fiber head. Connected to fiber optic transceivers, fiber optic and twisted-pair connections, received the information outlets. The main tools used in fiber optic fusion process: the light side boxes, fiber optic transceivers, pigtails, coupler, special wire stripper, fiber cutter.
Transmission system commonly used with pigtails SC / PC, FC / PC, the LC / PC ST / PC four interfaces.
Said pigtail connector marked, we can often see the FC / PC, SC / PC, etc., its meaning is as follows:
"/" The front part of the pigtail connector models.
The SC connector is the standard rectangular connector, engineering plastics, high temperature, not easily oxidized advantages. Transmission equipment sidelight interface for general use SC connectors.
"LC" connectors and SC connectors are similar in shape, smaller than the SC connector.
FC connector is a metal connector, usually used in the ODF side, pluggable metal joints more often than plastic.
More varieties signal connector, in addition to the three described above, as well as MTRJ, ST, MU, and so on.
"/" Followed by that fiber connector cross-section process, ie, polishing.
"PC" in the equipment of telecom operators is the most widely used, the joint cross-section is flat.
UPC attenuation is smaller than the "PC", generally used for devices with special needs, some foreign manufacturers ODF frame internal jump fiber with the FC / UPC, mainly to improve the indicators of the ODF device itself.
In addition, more applications in CATV broadcasting and early "APC" Model Pigtail head with the inclination of the face, can improve the quality of television signals, mainly due to the TV signal is analog optical modulation, when the connector coupling the surface is perpendicular to the reflected light returns along the original path. The fiber refractive index profile of uneven will again return to the coupling surface, although the energy is very small but because of the analog signal can not completely eliminate the noise, so the equivalent of a clear signal superimposed on a weak signal with a delay performance is ghosting on the screen. Pigtailed headband angle allows the reflected light returns along the original path. General digital signal there is generally no problem.

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