Maxim Integrated Products, Inc.
SYSTEMS AND METHODS FOR POLARIZATION CONTROL USING BLIND SOURCE SEPARATION

Abstract:

Analog signal processing systems and methods manage polarization in coherent optical receivers to eliminate the need for ultra-fast, power-hungry ADCs and DSPs and that require digitization of the full-bandwidth signal path and result in bulky and expensive circuit designs. Various embodiments an analog polarization correction circuit that implements the equivalent of two matrix operations by combining variable and unity gain amplifiers to align polarizations of input signals to generate a polarization-corrected output signal that is aligned with the polarization frame of reference of a receiver. Various embodiments use BSS to perform polarization control, including electro-optical polarization control, in a feedback loop and operate without the need for a pilot tone or a startup sequence when deducing the polarization state.