Optical Fiber; Overview - H3C S7500E Series Installation Manual

Optical fiber

CAUTION:
Use the same types of transceiver modules, pigtail cords, patch cords, and fiber cables. If you use
single-mode optical fibers, the transceiver modules, pigtail cords, patch cords, and fiber cables must be
single-mode.

Overview

Optical fiber
Optical fibers are widely used in fiber-optic communications, which are advantageous for long-distance
communications.
Optical fibers can be classified into the following types:
Single mode fiber: It has a core size of 10 μm, and has a lower modal dispersion. It carries only a
•
single ray of light. It is mostly used for communication over longer distances.
Multi-mode fiber: It has a core size of 50 μm or 62.5 μm or higher, and has a higher modal
•
dispersion than single-mode optical fiber. It is mostly used for communication over shorter
distances.
Table 81 Allowed maximum tensile force and crush load
Period of force
Short period
Long term
Optical fiber cable
An optical fiber cable is a cable containing one or more optical fibers. The optical fiber elements are
typically individually coated with plastic layers and contained in a protective tube. Optical fiber cables
fall into single-mode and multi-mode.
Patch cord
A fiber that has connectors at both ends is called a patch cord. A patch cord connects one optical device
to another for signal routing. Patch cords fall into single-mode and multi-mode patch cords.
Single-mode patch cord: The jacket is yellow. It permits transmission over longer distances.
•
Multi-mode patch cord: The jacket is orange. It permits transmission over shorter distances.
•
Patch cords are classified into SC, LC, and FC patch cords based on interface type. The length of a patch
cord can be 0.5 m (1.64 ft), 1 m (3.28 ft), 2 m (6.56 ft), 3 m (9.84 ft), 5 m (16.40 ft), and 10 m (32.81
ft).
Pigtail cord
A pigtail cord is an optical fiber that has an optical connector on one end and a length of exposed fiber
on the other. The end of the pigtail is fusion spliced to a fiber, connecting the fiber cable and transceiver.
Pigtail cords fall into single-mode (yellow) and multi-mode (orange), and can also be classified into SC,
LC, and FC pigtail cords based on interface type.
Tensile load (N)
150
80
153
Crush load (N/mm)
500
100