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N7786C Polarization Synthesizer
Keysight N778-C Series Polarization Instruments User's Guide
•
As an SOP switch, the N7785C allows switching the internal waveplates
to user definable angles with very high speed and repeatability.
•
As a traditional scrambler, the N7785C varies the output SOP smoothly
in a random walk pattern.
•
As a polarization stabilizer, the N7785C uses feedback via program
commands to set and stabilize the SOP based on an external reference.
Programming uses a new SCPI command set and the instrument is
addressed as a VISA resource. The instrument comes in a compact form
factor of just one rack height unit, with LAN and USB interfaces and does
not contain any moving parts.
For further details on its application and key features, refer to the product
datasheet available on www.keysight.com.
The Keysight Technologies N7786C contains a high-speed lithium-niobate
based polarization controller and a polarization analyzer that monitors the
output signal and provides feedback to the controller. This unit can
operate in several modes:
•
As a polarization stabilizer, it provides a stable output state of
polarization (SOP) even with fluctuations and drifts of the input SOP.
The stabilized output signal is guided in a standard single-mode fiber
(SMF). The output SOP can be defined in the following ways:
•
When the set-and-forget switch in the user interface is activated,
the current SOP is stored and maintained, even if polarization
changes occur on the instrument input.
•
Defined Stokes: the target output SOP can be defined by the user
using the Stokes parameters, which are then set using the
polarization analyzer feedback.
•
Defined sequence: the device switches the SOP of the output signal
in a chosen pattern with a cycling speed of up to 100 kSOPs/s.
•
As an SOP switch, the N7786C cycles through a sequence of SOPs at a
chosen rate up to more than 40 kHz. The internal settings for the SOP
sequence are first determined with the stabilizer function for rapid
direct switching. SOP switching occurs within a few microseconds. An
electrical trigger input can be used to synchronize the scrambler with
external events.
•
As a traditional scrambler, the N7786C varies the output SOP in a
random way. Full coverage of the Poincaré Sphere can be achieved
within a few milliseconds.
Getting Started
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