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5
1
Introduction
The
ViaLiteHD
RF Fibre Optic Links (FOLs) are a family of fibre optically coupled link systems
designed for the transmission of RF analogue signals over long distances for the communications
market.
ViaLiteHD
is a product brand manufactured by Pulse Power and Measurement Ltd (PPM).
ViaLite Communications
is a division of
Pulse Power and Measurement Ltd (PPM).
This handbook covers the following
ViaLiteHD
RF Link part numbers:
C-Band Transmitter modules (electrical
– optical converter) with part numbers starting
o
HRT-C
C-Band Receiver modules (optical - electrical converter) with part numbers starting
o
HRR-C
For complete information and product familiarisation, this handbook should be read in conjunction
with all other relevant handbooks for your
ViaLiteHD
system.
1.1
The C-Band
The
ViaLiteHD
RF Fibre Optic C-Band Links are designed to cover the extended C-Band frequency
range (uplink and downlink) of 3.4 GHz to 7.1 GHz.
Usable performance can be utilised beyond this range encompassing 500 MHz to 8GHz (see the
relevant characterisation data in section 3).
1.2
Typical deployment
A typical system operates as follows.
The user’s RF electrical signal is input to the transmitter module, which contains RF signal
conditioning and laser control circuitry. The module modulates the intensity of a beam of light with the
RF signal which then travels through an optical fibre to the receiver module. The distance between
transmitter and receiver can range from 1m to 100km; distances in excess of 100km can be achieved
with more complex optical transport systems, depending on the system specified. The receiver
module converts the modulated light back into an electrical signal, which is available at the output of
the module.
The C-Band link is also designed for use in Dense wavelength division multiplexed (DWDM) systems.
In this scenario, multiple links each operating on a different wavelength of light are combined in a
multiplexer and sent down a single optical fibre path. At the receiving end, a de-multiplexer separates
the wavelengths for the corresponding receivers. See section
Error! Reference source not found.
for wavelength options when considering the transmitters. Receiver modules however are wideband
and will respond to any wavelength of light passed to them.
ViaLite Communications
offer a design service for complex DWDM requirements including supply of
optical multiplexers, optical amplifiers, optical switches and dispersion compensators. On-site
commissioning and installation support is also available.
1.3
Care of fibre optic connectors
When the fibre optic cables are not connected, it is essential that the cable and equipment connectors
are protected by the dust caps provided with the system. Failure to do so may result in damage to the
fibre ends, which are critical to the system performance. Please refer to section 0 for fibre optic cable
handling details.
