Keysight N778xC Series Polarization Instruments User’s Guide 31
Getting Started 2
Optical Connections
Optical Output
Angled Contact Connectors
Angled contact connectors help you to control return loss. With angled
fiber end-faces, reflected light tends to reflect into the cladding, reducing
the amount of light that reflects back to the source. When reflected light
remains in the fiber core at two or more locations along the optical path,
such as at an open straight-polished connector output to a power meter,
double reflections result in multi-path interference of the coherent light
and thus power instability in the measurements.
Keysight N7781/85/86/88C polarization instruments can have the
following connector interface option:
• Option (0x2) angled connector
• Option (0x1) straight connector (N7781 x=2 N7788C x=3)
Figure 10 Angled and Straight Contact Connector Symbol
Figure 10 shows the symbols that tell you whether the contact connector
of your instrument is angled or straight. The angled contact connector
symbol is colored green.
Figure 5 to Figure 8 shows the front panel of the Keysight
N7781/85/86/88C polarization instruments with angled contact connector
respectively.
If the contact connector on your instrument is angled, you can only use
cables with angled connectors with the instrument.
Straight Contact
Connector Symbol
Angled Contact
Connector Symbol
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