Open AccessImproving performance of channel equalization in RSOA-based WDM-PON by QR decomposition
Author(s) -
Xiang Li,
Wen De Zhong,
Arokiaswami Alphones,
Yu Chen,
Zhaowen Xu
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.027299
Subject(s) - orthogonal frequency division multiplexing , wavelength division multiplexing , bit error rate , bandwidth (computing) , equalization (audio) , computer science , spectral efficiency , multiplexing , electronic engineering , modulation (music) , optical amplifier , optics , channel (broadcasting) , physics , telecommunications , wavelength , engineering , acoustics , laser
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.