The POS-002 polarization tracker automatically adjusts the state of polarization (SOP) towards a reference SOP, counteracting continuous input SOP variations as fast as 0.9 ms with no resets. The reference SOP is determined by a feedback signal which can be provided either internally or externally. The internal feedback version (POS-002-I) consists of a fiber squeezer polarization controller, in-line polarization monitor, digital and analog circuits, and proprietary algorithm. The error signal from the polarization monitor is fed back to the polarization controller to maintain a linear SOP at the output. The output fiber is typically PM fiber with the SOP aligned to its slow axis.
The external feedback version (POS-002-E) replaces the internal polarization monitor with an external analog electrical feedback signal of the user’s choice, such as a voltage proportional to the degree of polarization (DOP) measured by a polarimeter, the bit-error rate (BER) from a BER chip, the RF spectrum of a detected signal, or the optical power after a polarizer. The output fiber is typically single mode fiber.
Applications
PMD compensation
Polarization division demultiplexing
Elimination of polarization fading in coherent detection and fiber sensor systems
Suppression of noise figure in optical amplifiers
Reduction of PDL effects
Key Features
• Reset free operation
• 0.9 ms recovery time
• 47 π/s tracking speed
• "Plug and play" integration