Optical Fiber Function; What You Should Know; Optical Fiber - Triax MCT 080 User Manual

FIELD METERS MCT 080 / 081 / 082 / 085 USER MANUAL

24 Optical Fiber function

To access the "Fiber Optic" function, press the "HOME" key
The optical option allows measurements to be made in different installation configurations:
in fiber satellite reception (optical fiber LNB output)
-
- reception on a dish with an RF output up to 5.450 GHz
- behind a satellite / terrestrial fiber coupler
The option allows you to:
- measure the optical power on the fiber
convert the optical signal into an RF signal to retrieve the antenna signals
-
24.1

What you should know

A few notions are required before considering the use of optical fibers.

24.1.1 Optical fiber

Optical fibers are sometimes used for satellite reception. This technology enables makes it possible to
transmit a signal further with less loss and with a larger bandwidth.
The optical fiber is a waveguide, generally made of glass, that enables the transmission of the optical
signal. Optical fibers are made of a core, a cladding and at least one protection. There are two kinds of
optical fibers: multimode and single-mode.
The difference is the size of the core inside the fiber: 9µm diameter for single-mode, 50µm for multimode.
Multimode is less expensive, while single-mode induces less losses.
For satellite reception, only single-mode fibers are used.
Sectional view of an optical fiber:
Warning: Optical fibers are fragile and must not be constrained, bent or folded: the core
may be damaged or even broken, which results in a partial or total loss of the signal.
125µm
PROTECTION
and then the tab "Optical"
9 ou 50µm
CORE
CLADDING
p.
105