Open AccessPhase noise estimation and mitigation for DCT-based coherent optical OFDM systems
Author(s) -
Chuanchuan Yang,
Feng Yang,
Ziyu Wang
Publication year - 2009
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.17.017052
Subject(s) - orthogonal frequency division multiplexing , phase noise , discrete cosine transform , computer science , electronic engineering , noise (video) , discrete fourier transform (general) , multiplexing , algorithm , telecommunications , optics , fourier transform , fractional fourier transform , physics , engineering , artificial intelligence , channel (broadcasting) , fourier analysis , image (mathematics) , quantum mechanics
In this paper, as an attractive alternative to the conventional discrete Fourier transform (DFT) based orthogonal frequency division multiplexing (OFDM), discrete cosine transform (DCT) based OFDM which has certain advantages over its counterpart is studied for optical fiber communications. As is known, laser phase noise is a major impairment to the performance of coherent optical OFDM (CO-OFDM) systems. However, to our knowledge, detailed analysis of phase noise and the corresponding mitigation methods for DCT-based CO-OFDM systems have not been reported yet. To address these issues, we analyze the laser phase noise in the DCT-based CO-OFDM systems, and propose phase noise estimation and mitigation schemes. Numerical results show that the proposal is very effective in suppressing phase noise and could significantly improve the performance of DCT-based CO-OFDM systems.