title: Cascaded phase-preserving multilevel amplitude regeneration.
abstract: The performance of cascaded in-line phase-preserving amplitude regeneration using nonlinear amplifying loop mirrors has been studied in numerical simulations. As an example of a spectrally efficient modulation format with two amplitude states and multiple phase states, the regeneration performance of a star-16QAM format, basically an 8PSK format with two amplitude levels, was evaluated. An increased robustness against amplified spontaneous emission and nonlinear phase noise was observed resulting in a significantly increased transmission distance.
authors.forename: Tobias
authors.initials: T
authors.lastname: Roethlingshoefer
authors.forename: Georgy
authors.initials: G
authors.lastname: Onishchukov
authors.forename: Bernhard
authors.initials: B
authors.lastname: Schmauss
authors.forename: Gerd
authors.initials: G
authors.lastname: Leuchs
mesh_terms: D000669:Amplifiers, Electronic; D003195:Computer Communication Networks / Q000295:instrumentation*; D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007909:Lenses; D008027:Light; D015233:Models, Statistical; D017711:Nonlinear Dynamics; D012542:Scattering, Radiation; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D013685:Telecommunications / Q000295:instrumentation*