Investigation of I/Q Imbalance in Coherent Optical OFDM System

Authors: R. S. Fyath, Mustafa A. B. Al-Qadi

Abstract:

The inphase/quadrature (I/Q) amplitude and phase imbalance effects are studied in coherent optical orthogonal frequency division multiplexing (CO-OFDM) systems. An analytical model for the I/Q imbalance is developed and supported by simulation results. The results indicate that the I/Q imbalance degrades the BER performance considerably.

Keywords: Coherent detection, I/Q imbalance, OFDM, optical communications

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1059950

References:

[1] M. M.-K. Liu, "Principles and applications of optical communications," McGraw-Hill, Chicago, 1996.
[2] W. Shieh, Q. Yang, and Y. Ma, "107 Gb/s coherent optical OFDM transmission over 1000-km SSMF fiber using orthogonal band multiplexing," Optics Express, vol. 16, no. 9, pp. 6378-6386, April 2008.
[3] I. B. Djordjevic and B. Vasic, "Orthogonal frequency division multiplexing for high-speed optical transmission," Optics Express, vol. 14, no. 9, pp. 3767-3775, May 2006.
[4] A. J. Lowery, "Fiber nonlinearity mitigation in optical links that use OFDM for dispersion compensation," IEEE Photonics Technology Letters, vol. 19, no. 19, pp. 1556-1558, October 2007.
[5] B. J. C. Schmidt, A. J. Lowery, and J. Armstrong, "Experimental demonstrations of electronic dispersion compensation for long-haul transmission using direct detection optical OFDM," Journal of Lightwave Technology, vol. 26, no. 1, pp. 196-203, January 2008.
[6] A. Tarighat, R. Bagheri, A. H. Sayed, "Compensation schemes and performance analysis of IQ imbalances in OFDM receivers," IEEE Transactions on Signal Processing, vol. 53, no. 8, pp. 3257-3268, August 2005.
[7] C. F. Gu, C. L. Law, W. Wu, "Time domain IQ imbalance compensation for wideband wireless systems," IEEE Communications Letters, vol. 14, no. 6, pp. 539-541, June 2010.
[8] W.-R. Peng, B. Zhang, X, Wu, K.-M. Feng, A. E. Willner, and S. Chi, "Experimental demonstration of compensating the I/Q imbalance and bias deviation of the Mach-Zehnder modulator for an RF-tone assisted optical OFDM system," European Conference on Optical Communication (ECOC), 21-25 September, pp. 1-2, Brussels, 2008.
[9] C. S. Petrou, I. Roudas, and L. Raptis, "Impact of receiver imperfections on the performance of coherent intradyne DQPSK receivers," Conference on Lasers and Electro-Optics (CLEO), 4-9 May, pp. 1-2, San Jose, CA, 2008.
[10] W. Shieh, X. Yi, Y. Ma, and Q. Yang, "Coherent optical OFDM: has its time come
[Invited]," Journal of Optical Networking, vol. 7, no. 3, pp. 234-235, March 2008.
[11] W. Shieh, H. Bao, and Y. Tang, "Coherent optical OFDM: theory and design," Optics Express, vol. 16, no. 2, pp. 841-859, January 2008.
[12] Q. Yang, W Shieh, and Y. Ma, "Bit and power loading for coherent optical OFDM," IEEE Photonics Technology Letters, vol. 20, no. 15, pp. 1305-1307, August 2008.
[13] W. Shieh and I. Djordjevic, "OFDM for optical communications," Elsevier, Amsterdam, 2010.