POS-203 Polarization Stabilizer

The POS-203 Polarization Stabilizer maintains a stable output state of polarization (SOP) against any fluctuations in the feedback signal. The instrument uses an algorithm to either minimize or maximize the supplied feedback signal by dynamically altering the SOP.

The POS-203 architecture includes a fiber squeezer polarization controller and proprietary algorithms. It is able compensate for an input polarization discontinuity in as fast as 5 ms, or track without resets against a continuous input SOP rotation of up to 32π/s.

The POS-203 is a versatile instrument that automatically optimizes the output SOP to either maximize or minimize an optical or electrical feedback signal. It also allows the user to optimize the control cycle for particular applications by adjusting the step size, feedback delay, activation threshold, and search algorithm (maximum or minimum).

Key Features

Reset-free operation
Maximum or minimum search, tunable control parameters
Fast recovery time and tracking speed

Specifications

Wavelength range	1550, 1310, or 1060±50 nm
SOP recovery time	<5 ms (1.5 ms typical)
SOP rotation tracking speed	32π/s
SOP accuracy	<0.1 dB (PM output fiber, after polarizer)
Isolation in orthogonal polarization	20 dB
Insertion loss (IL)	<0.5 dB (POS-203 controller path)