title: Four-in-one interferometer for coherent and self-coherent detection.
abstract: A compact micro-optical interferometer is presented that combines two optical 90° hybrids or, alternatively, four delay interferometers into one interferometer structure sharing one tunable delay line. The interferometer can function as a frontend of either a coherent receiver or of a self-coherent receiver by adjusting the waveplates and the delay line. We built a prototype on a LIGA bench. We characterized the device and demonstrated its functionality by successful reception of a 112 Gbit/s signal.
authors.affiliation: Institutes IPQ and IMT, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany. jingshi.li@kit.edu
authors.forename: Jingshi
authors.initials: J
authors.lastname: Li
authors.forename: Muhammad Rodlin
authors.initials: MR
authors.lastname: Billah
authors.forename: Philipp C
authors.initials: PC
authors.lastname: Schindler
authors.forename: Matthias
authors.initials: M
authors.lastname: Lauermann
authors.forename: Sven
authors.initials: S
authors.lastname: Schuele
authors.forename: Stefan
authors.initials: S
authors.lastname: Hengsbach
authors.forename: Uwe
authors.initials: U
authors.lastname: Hollenbach
authors.forename: Juergen
authors.initials: J
authors.lastname: Mohr
authors.forename: Christian
authors.initials: C
authors.lastname: Koos
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Freude
authors.forename: Juerg
authors.initials: J
authors.lastname: Leuthold