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Relative Uncertainty due to Polarization (Optional Test)
Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User's Guide
11 Now connect the open end to the optical head.
12 Enter the Power reading [P] on the optical head as [FPDelta] on the
Return Loss Meter. Make sure you enter the sign of this value correctly.
13 Note the Return Loss reading as the Return Loss result into the test
record.
The performance test "Relative Uncertainty due to Polarization" is
NOTE
optional, since the polarization is given with the production of the unit by
mechanical and optical cavities and is unchanged by normal use of the
sensor module.
Refer to
due to polarization of the sensor module.
Generally, during this measurement procedure the tunable laser source is
swept through a predefined wavelength range. After every wavelength
step, a single PDL-measurement is made, where the polarization
controller generates all the different polarization states. The highest PDL
value is taken as the "relative uncertainty due to polarization". The low
output power path of the coupler is used to monitor the power stability of
the setup.
Figure 13
on page -66 for a setup to verify the relative uncertainty
Performance Tests
4
65
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