title: Space-demultiplexing based on higher-order Poincaré spheres.
abstract: We propose a space-demultiplexing algorithm based on signal analysis in higher-order Poincaré spheres for optical transmission systems supported by space-division multiplexing. This algorithm is modulation format agnostic and does not require training sequences. We show that any arbitrary pair of tributaries signals can be represented in a higher-order Poincaré sphere. In such sphere, the crosstalk between any two tributary signals can be reversed by computing and realigning the best fit plane. Using this procedure for all possible combinations of tributaries the transmitted signal is successfully recovered, with negligible signal-to-noise ratio (SNR) penalties for quadrature phase-shift keying (QPSK) and 16-quadrature amplitude modulation (QAM) constellations, and with a SNR penalty as lower as 0.5 dB for the 64-QAM.
authors.forename: Gil M
authors.initials: GM
authors.lastname: Fernandes
authors.forename: Nelson J
authors.initials: NJ
authors.lastname: Muga
authors.forename: Armando N
authors.initials: AN
authors.lastname: Pinto