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-µm MMF links having 3-dB
effective bandwidths as small as 150 MHz · 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.
© 2007 IEEE
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