Title :
Direct-detection 16-QAM Nyquist-shaped subcarrier modulation with SSBI mitigation
Author :
Li, Z. ; Erkilinc, M.S. ; Pachnicke, S. ; Griesser, H. ; Thomsen, B.C. ; Bayvel, P. ; Killey, R.I.
Author_Institution :
Optical Networks Group, Department of Electronic and Electrical Engineering, University College London, Torrington Place, WC1E 7JE, UK
Abstract :
We report on the first experimental demonstration of direct-detection dispersion pre-compensated single-sideband Nyquist-pulse-shaped 16-QAM subcarrier modulation (N-SCM) signal transmission using a signal-signal beat interference (SSBI) cancellation technique. The improvement in the system performance through the use of SSBI cancellation, which mitigates the nonlinear distortion caused by the square-law detection, was quantified by simulations and experiments for a 25 Gb/s N-SCM signal occupying an optical bandwidth of 8.75 GHz. A reduction of 3.6 dB in the back-to-back required OSNR at the 7% overhead HD-FEC threshold was achieved. A 1.1 dB increase in the Q2-factor after transmission over 800 km of uncompensated standard SMF was measured.
Keywords :
Integrated optics; Optical distortion; Optical fibers; Optical filters; Optical noise; Optical receivers; Nyquist pulse shaping; direct detection; electronic dispersion pre-compensation; signal-signal beat interference cancellation; subcarrier modulation;
Conference_Titel :
Communications (ICC), 2015 IEEE International Conference on
Conference_Location :
London, United Kingdom
DOI :
10.1109/ICC.2015.7249150
