Installation Guide

Litenna  Installation Guide Optical Test Procedure
Foxcom Wireless Proprietary Information Document No. 42-93-005-23D 33
Optical Fiber
Fiberoptic cable is described by the amount of fibers contained within.
The cable described by the following terms:
➤
Glass
➤
Buffer
➤
Jacket
Glass
Glass is the middle fiber in the cable. The data sent over the cable travels through
the glass.
Buffer
The buffer is the plastic coating that covers the fiberoptic cable. The buffer
protects the glass from moisture and other damage.
Jacket
The jacket covers the buffer, providing greater protection to the glass.
The fiber consists of:
➤
Core
➤
Clad
The central part of a fiber is known as the core, and the material surrounding the
core is know as the clad. The clad has a lower index of refraction than the core,
allowing light to be completely reflected off the surface between the core and the
clad. As a result, propagated light remains entirely within the core. The cross-
section of the cable is expressed as the core diameter followed by the clad
diameter. For example, a 9/125 fiber has a core diameter of 9
µ
m and a clad
diameter of 125
µ
m.






Figure 16 – Fiberoptic Cable Structure
9
µ
m 125
µ
m