Fiber Optic Design Guide - Maite y Mario

LABORATORIES, INC.
The Standard of Quality in TV Signal Distribution
Single Mode Broadband 15 Ch. Design Tool
1. Determine the optimum input level to the Tx:
Pick the point on the X-Axis that corresponds to the number of channels that you are going to put through the link. Follow
this up until you intersect with the curve, follow this intersection to the Y-axis on the left. This number is the optimum RF
input level to the Transmitter. ______dBmV (#1)
2. What is your link budget? This is the sum of all the losses from the Tx to the Rx. ______dBm (#2)
3. Determine the CNR of the link:
Transmitter Output 4 dBm
Link Budget (#2) - ______dBm
Received Optical Power = ______dBm(#3)
Drive Level per Channel (dBmV)
Pick the point on the X-Axis that corresponds to the received optical power (#3 above). Follow this number up until you
intersect with the curve, follow this intersection to the Y-axis on the left. This number is the CNR of the link.
CNR (dB)
20
18
16
14
12
10
8
62
60
58
56
54
52
50
48
46
44
42
40
38
36
34
32
1 10 100
Number of Channels Loading
-14 -12 -10 -8 -6 -4 -2 0 2 4
Receiver Input Light Level (dBm)
Section 2
10
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5 Channels
10 Channels
15 Channels
SM 15 Ch.