Title :
Maximizing the Transmission Performance of Adaptively Modulated Optical OFDM Signals in Multimode-Fiber Links by Optimizing Analog-to-Digital Converters
Author :
Tang, J.M. ; Shore, K. Alan
Author_Institution :
Sch. of Informatics, Univ. of Wales, Bangor
fDate :
3/1/2007 12:00:00 AM
Abstract :
Based on a comprehensive theoretical model of a recently proposed novel technique known as adaptively modulated optical orthogonal frequency-division multiplexing (AMOOFDM), investigations are undertaken into the impact of an analog-to-digital converter involved in the AMOOFDM modem on the transmission performance of AMOOFDM signals in unamplified intensity-modulation and direct-detection (IMDD) multimode-fiber (MMF)-based links. It is found that signal quantization and clipping effects are significant in determining the maximum achievable transmission performance of the AMOOFDM modem. A minimum quantization bit value of ten and optimum clipping ratio of 13 dB are identified, based on which, the transmission performance is maximized. It is shown that 40-Gb/s-over-220-m and 32-Gb/s-over-300-m IMDD-AMOOFDM signal transmission at 1550 nm with loss margins of about 15 dB is feasible in the installed worst case 62.5-mum MMF links having 3-dB effective bandwidths as small as 150 MHz middot km. Meanwhile, excellent performance, robustness to fiber types, and variation in launch conditions and signal bit rates is observed. In addition, discussions are presented of the potential of 100-Gb/s AMOOFDM signal transmission over installed MMF links
Keywords :
OFDM modulation; adaptive optics; intensity modulation; optical fibre communication; optical modulation; quantisation (signal); 100 Gbit/s; 1550 nm; 220 m; 300 m; 32 Gbit/s; 40 Gbit/s; OFDM signals; adaptive modulation; adaptively modulated optical orthogonal frequency-division multiplexing; analog-to-digital converters; clipping; direct detection; intensity modulation; multimode-fiber links; quantization; Adaptive optics; Analog-digital conversion; Frequency division multiplexing; Frequency modulation; Intensity modulation; Modems; OFDM modulation; Optical modulation; Propagation losses; Quantization; Analog–digital conversion; communication system performance; optical modulation; optical-fiber communication; orthogonal frequency-division multiplexing (OFDM); signal quantization;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2006.890457