Relative Wavelength (Frequency) Accuracy; Return Loss - Agilent Technologies 81950A User Manual

Definition of Terms Specifications
Measurement:
Using an Agilent Lightwave signal analyzer and bandwidth set to 3 MHz.

Relative wavelength (frequency) accuracy

When randomly changing the wavelength (frequency) of the tunable laser
source and measuring the differences between the displayed and the
actual wavelength (frequency), the relative wavelength (frequency)
accuracy is ± half the span between the maximum and the minimum value
of all differences.
Figure 9 Relative wavelength accuracy.
Conditions:
Uninterrupted tunable laser source output power, constant power setting,
constant temperature.

Return loss

Specifies the ratio of the optical power incident to the tunable laser source
output port at the wavelength set on the tunable laser source, to the power
reflected from the tunable laser source output port.
Conditions:
Tunable laser source output off.
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Agilent 81950A Compact TLS module, First Edition