Endace Measurement Systems.
http://www.endace.com
EDM01.05-10r1 DAG 4.3S Card User Manual
10
Revision 6. 22 September 2005.
3.1 DAG 4.3S Card Optical Power Input
, continued
Input power
When the DAG card is set up, measure the optical power at the receiver
and ensure that it is within the specified power range.
Input power is adjusted by:
•
Changing splitter ratio if power is too high or too low, or
•
Inserting an optical attenuator if power is too high.
3.2 Splitter Losses
Description
Splitters have the insertion losses marked on packaging or in
accompanying documentation.
•
A 50:50 splitter will have an insertion loss of between 3 dBm and 4
dBm on each output
•
90:10 splitter will have losses of about 10 dBm in the high loss
output, and <2 dBm in the low loss output
Single mode
fibre loss
A single mode fibre connected to a multi-mode input has minimal extra
loss.
Multi-mode
fibre loss
A multi-mode fibre connected to a single mode input creates large and
unpredictable loss.
Wavelength loss
Splitters are designed for a particular wavelength. When mismatched, the
split ratio will be different from that which was intended.
