Operative characteristics and application aspects of synchronous intra-bit polarization spreading for polarization independent heterodyne detection

Operative characteristics and application aspects of synchronous intra-hit polarization spreading (SIB-PS) technique for polarization independent heterodyne detection were investigated. The experimental investigation, carried out on a 622 Mbit/s FSK coherent transmission system, allowed an accurate study of the significant dependence of the IF spectrum broadening and of the baseband pulse-shape on the phase between the polarization spreading waveform and transmitted data, thus resulting in useful design criteria for practical applications of SIB-PS technique.<>