Anritsu MT9812B, Руководство по эксплуатации, Страница: 123 / 144

6-5
Performance Test
6
6.2.1 Linearity Between Ranges
Variable optical attenuator
MN9625A
×
2
Light source
MU952501A
Device under test (DUT)
Optical fiber Optical fiber
Fig. 6-3
Step Operation
1 Set up a measurement system like that shown in figure, above.
2 Insulate the DUT from the light for performing the zero-level
calibration.
3 Set the range of the DUT to +10 dBm.
4 Adjust the optical attenuator so that the display of the DUT
shows 0 dBm in the specified range.
5 Record the measured value (Measured value 1).
6 Lower the range of the DUT by 1 stage, and record the mea-
sured value (Measured value 2).
7 The difference between measured values 1 and 2 indicates the
error between the ranges.
8 Increase the attenuation value of the optical attenuator by 10
dB, and repeat the operation from step 5 through 7 up to the
minimum range of the DUT.
6.2.2 Polarization Dependency
PDL meter (PDL9412 made by
Ouyou Kodensha Co., Ltd. In Japan)
Light source
MU952501A
Device Under Test (DUT)
Optical fiber Optical fiber
Fig. 6-4
Step Operation
1 Set up a measurement system like that shown in figure, above.
2 Insulate the DUT from the light for performing the zero-level
calibration.
3 Set the DUT for P-P measurement.
4 Using the PDL meter, rotate the plane of polarization by 360
degrees or more (it takes 30 seconds or longer) and perform
measurement.
5 The P-P value after the measurement becomes the measured
value of polarization dependency.
6.2 Optical Sensor Performance Test