Keysight (Agilent) Technologies N7786B Optical Test Equipment


Polarization Synthesizer

Polarization Synthesizer
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The Agilent N7786B polarization synthesizer contains a high-speed Lithium-Niobate based polarization controller and a polarization analyzer plus a microcontroller based driving circuitry.

This unit can operate in various modes:

As 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:

  • Set-and-forget: When the front button is pushed, 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

As Synchronous Scrambler the device switches the SOP of the output signal in a (pseudo) random way with a cycling speed of up to 100 KSOPs/s.

Switching of the SOP occurs within few microseconds. An electrical trigger input can be used to synchronize the scrambler with external events.

As SOP Switch the Agilent N7786B cycles through a sequence of SOPs with a speed of more than 40KHz, which corresponds to a cycle time of less than 25 microseconds. The sequence of SOPs can easily be defined by the user using Stokes coefficients.

Full coverage of the Poincaré Sphere is achieved within few ms.

Key Specification

Key Benefits

  • Comprehensive Polarization Stabilization/Control/Switching Capabilities
  • Reset-Free/Endless Operation
  • Covers Entire Range from 1.3µm Window up to the L-Band
  • Compact Size


  • Transmission System Test: Polarization Sensitivity Analysis on Link / Transmission Quality
  • Recirculating Loop Experiments: Loop-Synchronous Polarization Scrambling
  • Interferometry: Polarization Stabilization to Maximize Contrast Ratio

N7786B OPTIONS (27)
81000FI Connector interface FC/PC/SPC
81000HI Connector interface E-2000 (physical contact)
81000KI Connector interface SC
81000LI LC Connector interface for source modules
81000NI Connector interface, connector type FC - narrow key way
81000SI Connector interface DIN 47256/4108
81000VI Connector interface ST
8164B-900 Power cord - United Kingdom
8164B-901 Power cord - Australia and New Zealand
8164B-902 Power cord - Continental Europe
8164B-903 Power cord - United States and Canada (120V)
8164B-906 Power cord - Switzerland
8164B-912 Power cord - Denmark
8164B-917 Power cord - India
8164B-918 Power cord - Japan
8164B-919 Power cord - Israel
8164B-920 Power cord - Argentina
8164B-922 Power cord - China
8164B-927 Power cord - Thailand
N7786B-021 Straight Contact Connectors
N7786B-022 Angled Contact Connectors
N7786B-0B0 Download the product manual from the Keysight website
N7786B-400 Polarization Synthesizer, 1270nm to 1375nm and 1460nm to 1620nm
N7786B-500 Polarization Synthesizer, 1460nm to 1620nm
R-50C-011-3 Calibration Assurance Plan - Return to Keysight - 3 years
R-50C-011-5 Calibration Assurance Plan - Return to Keysight - 5 years
R-51B-001-5Z Warranty Assurance Plan - Return to Keysight - 5 years
N7786B PRODUCT Q & A  
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