User`s guide

Power Tests Performance Tests
Agilent 81600B Tunable Laser Source Family, Fourth Edition 107
Power Stability
For definition, see “Power stability” on page 44.
Measurement Principle
The TLS module’s output is measured over a given time span at constant
temperature.
Figure 32 Stability of Power Output versus Time.
At the start of the test the TLS module is set:
• To any wavelength within its specified wavelength range,
• To any power specified for the TLS module at this wavelength.
The lower limit is the mininimum output power specified; the upper
limit by the maximum output power specified.
• Such that any modulation is off.
At the start of the test, a reference power value is taken.
At any time during the measurement, the actual output power is compared
to the reference and recorded.
The end of the test is defined by the specified stability time.
When testing Power Stability: A test duration of approximately
15 minutes (rather than 1 hour) is sufficient to demonstrate whether or not
the power control loop is working correctly.
NOTE