fibre length,15dBm,30dBm,40dBm
0,0,0,0
1.6,-5.199,-3.287,-0.954
3.7,-13.845,-8.112,-3.123
5.8,-19.589,-14.945,-5.426
7.9,,-19.407,-8.763
10,,-24.441,-10.861
12.1,,,-13.655
14.2,,,-14.003