title: Two-photon fourth-order polarimetery.
abstract: 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.
authors.affiliation: OFS Laboratories, OFS Fitel, Somerset, New Jersey 08873, USA. westbrook@ofsoptics.com
authors.forename: Paul S
authors.initials: PS
authors.lastname: Westbrook
authors.forename: Stephan
authors.initials: S
authors.lastname: Wielandy
authors.forename: Michael
authors.initials: M
authors.lastname: Fishteyn