Unit is a Agilent 8169A polarization controller with opt 022, angled contract connectors. The cable shown has two optical module connectors.

Manufactures description
The 8169A Polarization Controller, with single-mode fiber input and output, is used to change light from any polarized or unpolarized light source into any well-defined state of polarization. The design based on bulk-optic zero-order waveplates and a high-performance linear polarizer at the input provides optimum determination and repeatability of polarization states over a wide wavelength range. The 8169A is especially well suited for use together with a tunable laser to make swept-wavelength measurements of the polarization dependence of fiberoptic devices, by setting a set of relatively orthogonal polarization states for Mueller Matrix analysis. These measurements are supported by a Plug&Play driver and coordinated operation of the 8169A with an Agilent tunable laser and power meters can be enhanced with the Photonic Foundations Library software package. The fundamental basis of this flexible instrument also supports many general applications requiring polarization control and analysis.

-Accurate polarization control based on mechanical position of zero-order waveplates.
-Built-in algorithms for controlled polarization scanning.
-High accuracy and repeatability of output polarization state: +/-0.09 on Poincar Sphere
-Low wavelength dependence of output polarization state: +/- 0.1/nm on Poincar Sphere
-Accepts high input power levels and polarized or unpolarized light sources.
-Flexible attachment with interchangeable Agilent connector adapters..

Highly accurate and repeatable output polarization state reduces time for calibration of the test setup and minimizes test uncertainties.
The low wavelength dependent movement of output polarization empowers high speed, swept wavelength measurements as well as broadband applications.
The built-in auto-scanning capability allows fast characterization across polarization states

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