Keysight N777-C Series Tunable Laser Family User’s Guide 49
Definition of Terms 3
Figure 17 Circular traces on the Poincaré sphere used to calculate
polarization extinction ratio.
Power flatness versus wavelength
Specifies ± half the span (in dB) between the maximum and the minimum
actual power levels of the tunable laser source when changing the
wavelength.
Figure 18 Power flatness vs. wavelength.
Conditions: Uninterrupted tunable laser source output power, constant power setting,
constant temperature. Other conditions as specified.
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