title: 512QAM Nyquist sinc-pulse transmission at 54 Gbit/s in an optical bandwidth of 3 GHz.
abstract: We demonstrate for the first time transmission of 54 Gbit/s and 48 Gbit/s over 44 km and 150 km, respectively, utilizing an optical bandwidth of only 3 GHz. We used polarization division multiplexed 512QAM and 256QAM modulation formats in combination with Nyquist pulse shaping having virtually zero roll-off. The resulting spectral efficiencies range up to 18 bit/s/Hz and 16 bit/s/Hz, respectively. Taking into account the overhead required for forward error correction, the occupied signal bandwidth corresponds to net spectral efficiencies of 14.4 bit/s/Hz and 15 bit/s/Hz, which could be achieved in a wavelength division multiplexed network without spectral guard bands.
authors.affiliation: Institute of Photonics and Quantum Electronics (IPQ), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany. rene.schmogrow@kit.edu
authors.forename: R
authors.initials: R
authors.lastname: Schmogrow
authors.forename: D
authors.initials: D
authors.lastname: Hillerkuss
authors.forename: S
authors.initials: S
authors.lastname: Wolf
authors.forename: B
authors.initials: B
authors.lastname: Bäuerle
authors.forename: M
authors.initials: M
authors.lastname: Winter
authors.forename: P
authors.initials: P
authors.lastname: Kleinow
authors.forename: B
authors.initials: B
authors.lastname: Nebendahl
authors.forename: T
authors.initials: T
authors.lastname: Dippon
authors.forename: P C
authors.initials: PC
authors.lastname: Schindler
authors.forename: C
authors.initials: C
authors.lastname: Koos
authors.forename: W
authors.initials: W
authors.lastname: Freude
authors.forename: J
authors.initials: J
authors.lastname: Leuthold
mesh_terms: D003195:Computer Communication Networks / Q000295:instrumentation*; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D008872:Microwaves; D012031:Refractometry / Q000295:instrumentation*; D018401:Sample Size; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D013685:Telecommunications / Q000295:instrumentation*