Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1536061 | Optics Communications | 2012 | 5 Pages |
Abstract
For optical coherent M-ary quadrature amplitude modulation (M-QAM) system, the frequency offset can be extracted directly by applying Fast Fourier Transform (FFT) to the signal's argument, without removing the modulated data phase. By categorizing the constellation points and rotating some constellation points by π/4π/4, this algorithm is robust to extract the frequency offset against the noise. Numerical simulations of 16-QAM and 256-QAM coherent systems are presented to demonstrate this algorithm.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Song Yu, Yinwen Cao, Haijun Leng, Guohua Wu, Wanyi Gu,