We demonstrate a fourth-order polarimeter that employs two-photon detection to measure the fourth-order polarization coherency matrix (FOCM) of an optical signal. We measure the FOCM of picosecond pulses subjected to polarization mode dispersion (PMD). The fourth-order polarimeter distinguishes different PMD states even when the state of polarization, including the degree of polarization, is constant.
© 2005 Optical Society of America
Paul S. Westbrook, Stephan Wielandy, and Michael Fishteyn, "Two-photon fourth-order polarimetery," Opt. Lett. 30, 655-657 (2005)