Title :
Adaptive loading algorithms for IMDD optical OFDM PON systems using directly modulated lasers
Author :
Giacoumidis, E. ; Kavatzikidis, A. ; Tsokanos, A. ; Tang, J.M. ; Tomkos, I.
Author_Institution :
High-Speed Networks & Opt. Commun. (NOC) Group, Athens Inf. Technol. Center, Athens, Greece
Abstract :
A detailed study on the effectiveness of three proposed optical orthogonal frequency-division multiplexing (OOFDM) adaptive loading algorithms (ALAs) is conducted, addressing, for the first time, a number of crucial issues related to OOFDM directly modulated laser-based intensity-modulated and direct-detected passive optical networks (PONs). The ALAs include the power loading (PL), bit loading, and bit-and-power loading (BPL) algorithms. It is shown that in comparison with the most sophisticated BPL algorithm, the simplest PL algorithm is effective in escalating a single-channel OOFDM PON performance to its maximum potential. On the other hand, for multi-channel OOFDM PON and when employing a large number of subcarriers and high digital-to-analog/analog-to-digital converter sampling speed, the BPL algorithm should be adopted. The utilization of the three ALAs can also extend the optimum clipping ratio range up to at least 3 dB compared to a conventional identical modulation scheme.
Keywords :
OFDM modulation; adaptive modulation; analogue-digital conversion; digital-analogue conversion; intensity modulation; optical modulation; passive optical networks; wavelength division multiplexing; BPL algorithms; IMDD optical OFDM PON systems; OOFDM directly modulated laser-based intensity-modulation; OOFDM-ALA; adaptive loading algorithms; analog-to-digital converter sampling speed; bit loading algorithm; bit-and-power loading algorithms; direct-detected passive optical networks; directly modulated lasers; high digital-to-analog converter sampling speed; identical modulation scheme; multichannel OOFDM PON; optical orthogonal frequency-division multiplexing; single-channel OOFDM PON performance; wavelength-division multiplexing; Bit error rate; Loading; Modulation; Optical receivers; Passive optical networks; Power line communications; Wavelength division multiplexing; Modulation; Multiplexing; OFDM; Optical fiber communication; Wavelength-division multiplexing;
Journal_Title :
Optical Communications and Networking, IEEE/OSA Journal of
DOI :
10.1364/JOCN.4.000769