Investigation of PMD in direct-detection optical OFDM with zero padding

Xiang Li, Arokiaswami Alphones, Wen De Zhong, Changyuan Yu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

8 Citations (Scopus)


We investigate the polarization-mode dispersion (PMD) effect of zero padding OFDM (ZP-OFDM) in direct-detection optical orthogonal frequency division multiplexing (DDO-OFDM) systems. We first study the conventional equalization method for ZP-OFDM. Then an equalization method based on sorted QR decomposition is proposed to further improve the performance. It is found that the performance improvement of ZPOFDM is due to the frequency domain oversampling (FDO) induced intercarrier interference (ICI). Numerical simulation results show that compared with cyclic prefix OFDM (CP-OFDM), ZP-OFDM has a significantly higher tolerance to PMD in DDO-OFDM systems when the channel spectral nulls occur at certain differential group delay (DGD) values.
Original languageEnglish
Pages (from-to)20851-20856
Number of pages6
JournalOptics Express
Issue number18
Publication statusPublished - 9 Sept 2013
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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