User Manual

6-19
IM 735020-01E
Setting the Optical Pulse Measurement Conditions (Detail Mode (Manually Setting All Items))
Index
App
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Explanation
Setting the Group Refraction Index
The following group refraction indexes are assigned according to the wavelength on the
AQ7270/AQ7275.
850 nm: 1.46000
1300 nm: 1.46000
1310 nm:
1.46000
1490 nm: 1.46000
1550 nm: 1.46000
1625 nm: 1.46000
1650 nm: 1.46000
The selectable range is 1.30000 to 1.79999.
Setting the Backscattering Light Level
A phenomenon called Rayleigh scattering occurs in the light that traverse through an
optical fiber cable. Within the Rayleigh scattering, the portion of the light that scatters in
the direction opposite to the propagation direction of light is called backscattering. The
backscattering light level setting is used to calculate the return loss and total return loss.
The following backscattering light levels are assigned according to the wavelength on the
AQ7270/AQ7275.
850
nm:
–32dB
1300nm: –41dB
1310nm: –50dB
1490nm: –52dB
1550nm: –52dB
1625nm: –53dB
1650nm: –53dB
The selectable range is -10.00 to -64.99.
6.2 Setting the Analysis Conditions