OPTICAL SYSTEMS DESIGN
DOC ID: 10111701
OSD9003/OSD9004 OPERATOR MANUAL
PAGE 4
1
TECHNICAL SUMMARY
1.1
BRIEF DESCRIPTION
1.1.1
OVERVIEW
The OSD9003 transmitter provides an extremely wideband transmission capability which allows its use
in a variety of RF over fiber applications. It has an excellent frequency response characteristic which
enables its employment in paging systems as well as its primary applications of cellular RF trunking at
800-1000MHz and 1700-1900MHz. It employs extremely linear circuitry to ensure very wide dynamic
range performance as required in uplink applications. It is completely format independent so can
support any current or proposed cellular system.
The unit employs a very wideband laser driver and DFB laser to ensure outstanding linearity, noise
performance and dynamic range.
A very convenient feature is the user selectable automatic or manual input RF level adjustment.
The OSD9004 is designed to receive intensity modulated optical signals in the wavelength range 1200
to 1600nm. It also employs extremely linear circuitry to ensure very wide dynamic range performance
as required in uplink applications and is completely format independent so can support any current or
proposed cellular system.
The receiver is a wideband balanced PIN photodiode design which has outstanding linearity, noise
performance and dynamic range.
The OSD9004 is supplied with a built in automatic gain control (AGC) controlled by the received
optical level, a feature which greatly simplifies installation and ongoing operation. However the user
can elect to use manual gain control which can be useful in some specialized applications.
Both the OSD9003 and OSD9004 are packaged in a very small, rugged standalone enclosure operating
from a wide range of input power supply voltages, allowing totally non-critical powering.
Furthermore the enclosure has excellent RF shielding so that the unit can be installed in almost any RF
environment which, combined with its wide operating range of -20 to +65ºC, allows it to be installed
almost anywhere on the planet.
1.1.2
APPLICATIONS
▲
Any linear RF transmission over fiber
from 10 to 2500MHz such as
remoting and EMI/EMC
measurements
▲
Mobile RF systems between 800 and
1900MHz
▲
UHF/VHF radio links
1.1.3
FEATURES AND BENEFITS
▲
Standard optical and RF connectors
simplify system integration
▲
Operates over from at least 40km of
singlemode cable and optionally
available with high power laser to
operate over at least 80km
▲
OSD9003 has high linearity and low
noise DFB laser enables very wide
dynamic range links
▲
OSD9003 has user selectable manual
or automatic input level control
enables flexible system integration
▲
Operates with non-critical power
▲
OSD9003 has a bargraph display of
input RF level while the OSD9004
displays the input optical signal level
▲
OSD9004 is available with user
selectable manual gain control or
automatic gain control for convenient
system integration.
▲
Operates from -20
°
C
to +65
°
C
so can
be installed in almost any
environment
▲
Extremely rugged metal case
▲
Optional remote monitoring/alarming
capability
