41
Insert and remove a plug with care. Never exert a fierce force to the fiber or plug; otherwise the plug
might be damaged or the fiber might be broken. Never pull, press or extrude the fiber fiercely. For the
allowed maximum tensile load and crush load, see
.
Table 11 Characteristics of single-mode and multi-mode optical fibers
Item
Single-mode fiber
Multi-mode fiber
Core
Small core (10 micrometers or less)
Larger core than single-mode fiber (50
micrometers, 62.5 micrometers or greater)
Dispersion Less
dispersion
Allows greater dispersion and therefore, signal
loss exists.
Light source and
transmission
distance
Users lasers as the light source often
within campus backbones for
distance of several thousand meters
Uses LEDs as the light source often within
LANs or distances of a couple hundred meters
within a campus network
Table 12 Allowed maximum tensile force and crush load
Period of force
Tensile load (N)
Crush load (N/mm)
Short period
150
500
Long term
80
100
Fiber connectors are indispensable passive components in an optical fiber communication system.
They allow the removable connection between optical channels, which makes the optical system
debugging and maintenance more convenient. There are multiple types of fiber connectors.
shows an LC connector.
Figure 47 Appearance of an LC connector
Connecting a fiber cable
WARNING!
Do not stare into any fiber ports when you connect an optical fiber. The laser light emitted from the
optical fiber might hurt your eyes.
To connect a fiber cable:
1.
Remove the dust plug from a fiber port of the router.
