Title :
Compensation of Nonlinear Phase Noise Using the Effective Negative Nonlinearity of a Nonlinear Amplifying Loop Mirror
Author :
Sponsel, Klaus ; Stephan, Christian ; Onishchukov, Georgy ; Schmauss, Bernhard ; Leuchs, Gerd
Author_Institution :
Inst. of Opt., Inf. & Photonics, Univ. of Erlangen-Nuremberg, Erlangen, Germany
Abstract :
The nonlinear amplifying loop mirror (NALM) has been explored for use as a nonlinear phase-shift compensator (NPSC). Operation conditions for a tunable effective negative nonlinearity are considered and the NALM parameter optimization is discussed for direct bit-error-ratio (BER) improvement by postcompensation after a nonlinear transmission line. In this configuration, the fundamental limits for NPSC are estimated for differential quadrature phase-shift keying (DQPSK) using a simplified model. Numerical simulations of a 20 Gb/s RZ-DQPSK transmission system confirmed the applicability of this model and showed a significant BER improvement in a realistic transmission line. Alternatively, the fiber launch power per span could be increased by 2 dB for the same BER.
Keywords :
mirrors; nonlinear optics; optical communication equipment; optical modulation; optical noise; phase noise; quadrature phase shift keying; NALM parameter optimization; RZ-DQPSK; bit rate 20 Gbit/s; differential quadrature phase shift keying; direct bit-error-ratio improvement; nonlinear amplifying loop mirror; nonlinear phase noise; nonlinear phase shift compensator; tunable effective negative nonlinearity; Bit error rate; Gain; Modulation; Nonlinear optics; Phase noise; Transfer functions; All-optical regeneration; negative nonlinearity; nonlinear optics; phase-shift keying;
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
Conference_Location :
4/21/2011 12:00:00 AM
DOI :
10.1109/JSTQE.2011.2129590
