In-line polarimeter

Inline polarimeter from General Photonics

The POD-101D is a DSP (digital signal processor) powered in-line polarimeter specially designed for high-speed polarization analysis and monitoring. The instrument uses four channels to simultaneously obtain the four Stokes parameters and measure the instantaneous state of polarization (SOP) and degree of polarization (DOP) of an input light beam. A simple USB interface enables data to be transferred directly to a computer without the need for any additional hardware. 

Features of the in-line polarimeter

Thanks to the high speed DSP electronics, this polarimeter easily monitors and analyzes fast polarization changes with a sampling rate of up to 625 kS/s. The in-line polarimeter comes with PolaView software for real-time graphic display of polarization state either on a Poincaré Sphere window for viewing SOP traces or on an oscilloscope window for tracking polarization changes over time. 

• Self-calibration program to optimize DOP and SOP accuracies at arbitrary wavelengths and temperatures.
• OLED display for setup and data display
• Real time Poincaré Sphere display, Analog SOP/DOP/power output for ATE integration

Application of the in-line polarimeter

• 100 G system polarization test
• SOP/DOP Monitoring
• Polarization Stabilization

The in-line polarimeter is ideal for PMD compensation, polarization stabilization, system polarization monitoring, polarization analysis, and sensor analysis.

Operation modes of the in-line polarimeter

The oscilloscope window has three operation modes: continuous scan mode, for instantaneous display of various polarization parameters; external trigger mode, for capturing transient events; and long term monitoring mode, for recording only the polarization changes above a predetermined threshold, in order to save hard drive space.