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Chapter 4 Reflectometry measurements
Configuring the reflectometry test
–
Macro Bend Wavelength: select the wavelength for the macro
bend: No / 1310/1550nm / 1310/1625nm / 1550/1625nm.
Refraction index
Choice of group refraction index of the whole fiber.
–
–
User
–
Either: define for each wavelength (1310 SM, 1360-1510 SM,
1550 SM, 1625 SM) a refraction index of 1.30000 à 1.69999.
The selection of an index alters the value of the section AB
(actual distance between cursors A and B).
–
or, if the actual distance between the cursors A and B is known,
enter its value under Section AB to establish the index of the
fiber. Selection of this distance causes the display of the indices.
The extreme distance values are given by the index values
(1.30000 à 1.70000).
Predefined index
–
It is possible to choose one of the predefined values given for
certain cables. The corresponding indices given in the table
below are repeated on the screen.
Wavelength
(nm)
1310 SM
1475 1480
1510 1550 1625 SM
ATT SM
Corning SMF-28
Corning SMF-DS
Corning SMF-LS
Corning-LEAF
Fitel Furukawa
Lucent Truewave
SpecTran SM
Litespec
1.46600
1.46750
1.47180
1.47100
1.46890
1.47000
1.47380
1.46750
1.46600
1.46700
1.46810
1.47110
1.47000
1.46840
1.47000
1.47320
1.46810
1.46700
Fig. 17
48
Predefined index values (Single Mode)
Wavelength
(nm)
850 MM
1300 MM
Corning 62.5
Corning 50
SpecTran 62.5
1.50140
1.48970
1.49600
1.49660
1.48560
1.49100
User Manual
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