48 Keysight N777-C Series Tunable Laser Family User’s Guide
3 Definition of Terms
Measurement: Using a power meter at the end of a 2 m single-mode fiber patchcord.
Mode-hop free tunability
Specifies the wavelength range for which no abrupt wavelength change
occurs in Stepped mode.
Operating temperature and humidity
The ambient temperature range and humidity range of the tunable laser
source for which the specifications apply.
Output isolation
The insertion loss of the built-in isolator in the backward direction.
Measurement: This characteristic cannot be measured from outside the instrument. It is
based on known isolator characteristics.
Polarization extinction ratio
Specifies the ratio of the optical power in the slow axis of a connected
polarization-maintaining fiber to optical power in the fast axis, expressed
in dB
Measurement: Using a polarization analyzer at the end of a polarization-maintaining
patchcord, by sweeping the wavelength to create circular traces on the
Poincaré sphere. Calculate the polarization extinction ratio from the
diameters of these circles.
If the instrument is rack-mounted, the temperature and humidity within
the rack apply.
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