A hybrid IQ imbalance compensation method for optical OFDM transmission.

Transmitter and receiver IQ imbalance causes image interference that degrades performance in high capacity and high spectral efficiency optical orthogonal frequency division multiplexing (OFDM) schemes. Digital compensation is an attractive method to relax component specifications. In this paper we report the details of a hybrid compensation method for IQ imbalance compensation, comprising of orthogonal training symbol-based method for transmitter-side compensation and an iterative image reduction-based method for receiver-side imbalance compensation. We demonstrate performance improvement using the hybrid method in presence of frequency dependent imbalance by both simulation and back-to-back direct detection optical OFDM experiment. We report on the tolerable limit of transmitter IQ imbalance under presence of carrier frequency offset.

[1]  Mikko Valkama,et al.  Advanced methods for I/Q imbalance compensation in communication receivers , 2001, IEEE Trans. Signal Process..

[2]  A.J. Lowery,et al.  Experimental Demonstrations of Electronic Dispersion Compensation for Long-Haul Transmission Using Direct-Detection Optical OFDM , 2008, Journal of Lightwave Technology.

[3]  Sien Chi,et al.  Experimental demonstration of compensating the I/Q imbalance and bias deviation of the Mach-Zehnder modulator for an RF-tone assisted optical OFDM system , 2008, 2008 34th European Conference on Optical Communication.

[4]  S. Jansen,et al.  121.9-Gb/s PDM-OFDM Transmission With 2-b/s/Hz Spectral Efficiency Over 1000 km of SSMF , 2009, Journal of Lightwave Technology.

[5]  W. Shieh,et al.  1-Tb/s single-channel coherent optical OFDM transmission over 600-km SSMF fiber with subwavelength bandwidth access. , 2009, Optics express.

[6]  Arthur J. Lowery,et al.  100 Gbit/s transmission using single-band direct-detection Optical OFDM , 2009, 2009 Conference on Optical Fiber Communication - incudes post deadline papers.

[7]  I. Morita,et al.  Effect of hybrid IQ imbalance compensation in 27.3-Gbit/s direct-detection OFDM transmission , 2009, 2009 Conference on Optical Fiber Communication - incudes post deadline papers.

[8]  Ting Wang,et al.  108 Gb/s OFDMA-PON with polarization multiplexing and direct-detection , 2009, OFC 2009.

[9]  A. Al Amin,et al.  Highly Spectrally Efficient DWDM Transmission at 7.0 b/s/Hz Using 8$\,\times\,$ 65.1-Gb/s Coherent PDM-OFDM , 2010, Journal of Lightwave Technology.