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Journal of Lightwave Technology

Journal of Lightwave Technology


  • Vol. 27, Iss. 10 — May. 15, 2009
  • pp: 1340–1346

Estimation of the Bit Error Rate for Direct-Detected OFDM Signals With Optically Preamplified Receivers

Wei-Ren Peng, Kai-Ming Feng, Alan E. Willner, and Sien Chi

Journal of Lightwave Technology, Vol. 27, Issue 10, pp. 1340-1346 (2009)

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In this paper, we provide a numerical bit error rate (BER) estimation approach for direct-detected orthogonal frequency division multiplexing (OFDM) signals in the presence of optical preamplified receivers. The individual BER of each subcarrier is first computed by considering their electrical signal-to-noise ratio (SNR), and then the ensemble BER is derived simply by taking the average of all the subcarriers' BERs. The calculated BER is verified by the conventional error-counting approach with high precision and is still accurate with higher quadratic-amplitude modulation (QAM) formats, even under the influences of the optical filtering and polarization mode dispersion (PMD) effects. Based on our simulation approach, the required extra power budget for 16- and 64-QAM relative to 4-QAM format are found to be ${\sim}$3.8 and 8.2 dB, respectively, at a BER of 10$^{-9}$. Furthermore, we use this approach to compare the receiving sensitivities and PMD tolerances for the previous proposed gapped and interleaved radio-frequency (RF)-tone-assisted OFDM systems. The results show that the gapped OFDM has a better sensitivity while the interleaved OFDM has a more PMD-tolerable capability.

© 2008 IEEE

Wei-Ren Peng, Kai-Ming Feng, Alan E. Willner, and Sien Chi, "Estimation of the Bit Error Rate for Direct-Detected OFDM Signals With Optically Preamplified Receivers," J. Lightwave Technol. 27, 1340-1346 (2009)

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