title: Free-space optical delay interferometer with tunable delay and phase.
abstract: A free-space optical delay interferometer (DI) featuring a continuously tunable time delay, polarization insensitive operation with high extinction ratios and accurate phase and time delay monitoring scheme is reported. The polarization dependence is actively mitigated by adjusting a birefringent liquid-crystal device. The DI has been tested for reception of D(m)PSK signals.
authors.affiliation: Institute of Photonics and Quantum Electronics, Karlsruhe Institute of Technology, Karlsruhe, Germany. jingshi.li@kit.edu
authors.forename: Jingshi
authors.initials: J
authors.lastname: Li
authors.forename: Kai
authors.initials: K
authors.lastname: Worms
authors.forename: Ruediger
authors.initials: R
authors.lastname: Maestle
authors.forename: David
authors.initials: D
authors.lastname: Hillerkuss
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Freude
authors.forename: Juerg
authors.initials: J
authors.lastname: Leuthold