Pilot-aided channel equalization in RGI-PDM-CO-OFDM systems

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

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)

Abstract

A pilot-aided channel equalizer (PACE) is proposed to mitigate the impairments caused by the polarization mode dispersion and laser phase noise simultaneously in reduced-guard-interval polarization-division-multiplexing coherent-optical orthogonal-frequency-division-multiplexing (RGI-PDM-CO-OFDM) transmission systems. Since PACE updates the channel state information symbol-by-symbol, it enables us to track the drifts in the optical channel. Adaptive PACE (APACE) and boosted PACE (BPACE) are then proposed to further improve the performance of PACE. Numerical simulations are carried out to compare the performance of APACE and BPACE with a conventional training symbols aided channel equalizer (TSACE) and adaptive decision-direct channel equalizer for a 108-Gb/s (56-GS/s) RGI-PDM-CO-OFDM system. It is revealed that both APACE and BPACE offer superior performances over the other two equalizers in the presence of laser phase noise, and they can tolerate lasers with a line width around $β=2000~{\rm k}$ ($2\π\β T-{s}=2.24\times 10$ when it is normalized to the symbol rate \$1/Ts). We also show that only small additional computation efforts are required for APACE and BPACE when compared with TSACE.
Original language English 6583341 1924-1927 4 IEEE Photonics Technology Letters 25 19 https://doi.org/10.1109/LPT.2013.2278994 Published - 30 Sep 2013 Yes

Keywords

• Orthogonal frequency division multiplexing
• pilot-aided channel equalizer
• polarization division multiplexing

ASJC Scopus subject areas

• Electronic, Optical and Magnetic Materials
• Atomic and Molecular Physics, and Optics
• Electrical and Electronic Engineering