Installation Manual

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Table 9 Characteristics of single mode and multi-mode optical fibers
Sin
g
le 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 10 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. Figure 26 sh
ows an LC
connector.
Figure 26 Appearance of an LC connector