Adaptive loading algorithms for IMDD optical OFDM PON systems using directly modulated lasers

E. Giacoumidis, A. Kavatzikidis, Athanasios Tsokanos, J. M. Tang, I. Tomkos

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)


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.

Original languageEnglish
Article number6331138
Pages (from-to)769-778
Number of pages10
JournalJournal of Optical Communications and Networking
Issue number10
Publication statusPublished - 2012


  • Modulation
  • Multiplexing
  • OFDM
  • Optical fiber communication
  • Wavelength-division multiplexing


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