The POS-002 Polarization Tracker modules maintain stable output states of polarization (SOP) against input SOP fluctuations.
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 control 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 controller adjusts the polarization to maximize the feedback signal. The output fiber is typically single mode fiber.
The function is similar to that of the POS-20X instruments, but in compact module form for integration into larger systems.
- Reset-free operation
- Internal or external feedback versions available
- Fast recovery time and tracking speed
Wavelength range 1550, 1310, or 1060±50nm SOP recovery time <3ms (0.9 ms typical) SOP rotation tracking speed 47π/s SOP accuracy <0.1 dB (PM output fiber, after polarizer) Isolation in orthogonal polarization 20 dB Insertion loss (IL) <1.2 dB (POS-002-I)
<0.1 dB (POS-002-E)
For full specifications, please download the data sheet.