Improving performance of channel equalization in RSOA-based WDM-PON by QR decomposition

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

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)


In reflective semiconductor optical amplifier (RSOA)-based wavelength division multiplexed passive optical network (WDM-PON), the bit rate is limited by low modulation bandwidth of RSOAs. To overcome the limitation, we apply QR decomposition in channel equalizer (QR-CE) to achieve successive interference cancellation (SIC) for discrete Fourier transform spreading orthogonal frequency division multiplexing (DFT-S OFDM) signal. Using an RSOA with a 3-dB modulation bandwidth of only ∼800 MHz, we experimentally demonstrate a 15.5-Gb/s over 20-km SSMF DFT-S OFDM transmission with QR-CE. The experimental results show that DFTS-OFDM with QR-CE attains much better BER performance than DFTS-OFDM and OFDM with conventional channel equalizers. The impacts of several parameters on QR-CE are investigated. It is found that 2 sub-bands in one OFDM symbol and 1 pilot in each sub-band are sufficient to achieve optimal performance and maintain the high spectral efficiency.
Original languageEnglish
Pages (from-to)27299-27305
Number of pages7
JournalOptics Express
Issue number21
Publication statusPublished - 19 Oct 2015
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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