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Q: Fachverband Quantenoptik und Photonik
Q 15: Poster 1: Quanteninformation, Quanteneffekte, Laserentwicklung, Laseranwendungen, Ultrakurze Pulse, Photonik
Q 15.30: Poster
Monday, March 14, 2011, 16:30–19:30, P1
Phase-preserving amplitude regeneration of quadrature-amplitude-modulated signals — •Tobias Röthlingshöfer1,2,3, Georgy Onishchukov2,3, Bernhard Schmauss3,4, and Gerd Leuchs1,2,3 — 1Institute of Optics, Information and Photonics, University Erlangen — 2Max Planck Institute for the Science of Light — 3Erlangen Graduate School in Advanced Optical Technologies (SAOT) — 4Chair for Microwave Engineering, University Erlangen
Quadrature amplitude modulation (QAM), a combination of amplitude and phase-shift keying, has often been suggested to increase the spectral efficiency in optical communication systems.
Its main problem is a higher sensitivity to amplitude and phase noise. Amplitude noise can be converted into nonlinear phase noise in the transmission fiber due to the Gordon-Mollenauer effect which is usually the major limiting factor for phase-encoded transmission. As the regeneration of the signal phase is complex, phase-preserving amplitude regeneration can be used to reduce amplitude fluctuations, which are the origin of nonlinear phase noise. Such phase-preserving amplitude regeneration of signals with phase-shift keying has been demonstrated using a nonlinear amplifying loop mirror (NALM). Due to its periodic behavior of the power transfer characteristic, this regenerator type is a promising candidate for multilevel phase-preserving amplitude regeneration as well.
A comparison of different NALM modifications and their performance for phase-preserving amplitude regeneration of QAM formats is presented.