Improved modulation format identification based on Stokes parameters using combination of fuzzy c-means and hierarchical clustering in coherent optical communication system

Longxue Cheng; Lixia Xi; Donghe Zhao; Xianfeng Tang; Wenbo Zhang; Xiaoguang Zhang

doi:10.3788/COL201513.100604

Journals >Chinese Optics Letters >Volume 13 >Issue 10 >Page 100604 > Article

Chinese Optics Letters
Vol. 13, Issue 10, 100604 (2015)

Improved modulation format identification based on Stokes parameters using combination of fuzzy c-means and hierarchical clustering in coherent optical communication system

Longxue Cheng¹, Lixia Xi^1、*, Donghe Zhao¹, Xianfeng Tang¹, Wenbo Zhang², and Xiaoguang Zhang¹

Author Affiliations

¹State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China

²School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China

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DOI: 10.3788/COL201513.100604 Cite this Article Set citation alerts

Longxue Cheng, Lixia Xi, Donghe Zhao, Xianfeng Tang, Wenbo Zhang, Xiaoguang Zhang. Improved modulation format identification based on Stokes parameters using combination of fuzzy c-means and hierarchical clustering in coherent optical communication system[J]. Chinese Optics Letters, 2015, 13(10): 100604 Copy Citation Text

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Abstract

In this Letter, we develop the Stokes space-based method for modulation format identification by combing power spectral density and a cluster analysis to identify quadrature amplitude modulation (QAM) and phase-shift keying (PSK) signals. Fuzzy c-means and hierarchical clustering algorithms are used for the cluster analysis. Simulations are conducted for binary PSK, quadrature PSK, 8PSK, 16-QAM, and 32-QAM signals. The results demonstrate that the proposed technique can effectively classify all these modulation formats, and that the method is superior in lowering the threshold of the optical signal-to-noise ratio. Meanwhile, the proposed method is insensitive to phase offset and laser phase noise.