Installation guide

Planning and Designing RIO Cable System
890 USE 101 00 October 2006 57
Example—
Attenuation on a
Simple Optical
Link
Here is an example of a point-to-point optical connection that uses 3 km of 62.5/125
μm fiber cable. There is one splice in the cable connection.
The specified power loss budget for a link using this optical cable is 11 dB. We know
that the cable’s attenuation over 3 km is 3.5 dB/km x 3 = 10.5 dB, and we are given
an attenuation of 0.25 dB for the cable splice. Thus, we have a total optical power
loss of 10.75 dB on the link, which is under budget and therefore legal.
P/S PLC RIO I/O I/O I/O
RIO I/O I/O I/OP/S
3 km
62.5/125 µm Fiber Optic Cable
(3.5 dB/km)
splice
(0.25 dB)
This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com