[1] SHAO Yu-feng,LI Jia,CHENG Li-li,et al. Four Serial Differential Phase-Shift Keying Modulation Formats for 100 Gbit/s Transmission Applications [J]. Chin. J. Lasers,2009,36(3):574-580.

[2] SHAO Yu-feng,CHEN Lin,WEN Shuang-chun,et al. Novel scheme for generation of optical dark RZ label signals [J]. Acta Optical Sinica,2007,27(9):1580-1584.

[3] Chi N, Zhang J, Holm-Nielsen P V, et al. Experimental demonstration of cascaded transmission and all-optical label swapping of orthogonal IM/FSK labelled signal [J]. Electronics Letters (S0013-5194),2003,39(1):676–678.

[4] Shao Yu-feng, Wen Shuang-chun, Chen Lin, et al. Additional applications of modified duobinary return-to-zero signal in the label switching optical system [J]. Chinese Journal of Lasers,2008,35(8):1201-1208.

[5] Baier A. Quadrature Mixer Imbalances in Digital TDMA Mobile Radio Receivers[C]// Digital Communications, 1990. Electronic Circuits and Systems for Communications,Zurich,Switzerland,Mar 5-8,1990:147-162.

[6] Schenk T C W. RF Imperfections in High-rate Wireless Systems [M]. Springer:Baker & Taylor Books,2008.

[7] Schuchert A,Hashozner R. A novel IQ imbalance compensation scheme for the reception of OFDM signals [J]. IEEE Trans. on Consumer Electronics (S0098-3063),2001,47(3):313-318.

[8] Valkma M,Renfors M,Koivunen K. Advanced methods for I/ Q imbalance compensation in communication receivers [J]. IEEE Trans. on Signal Processing (S1053-587X),2001,49(10):2355-2344.

[9] Alireza Tarighat,Rahim Bagheri,Ali H Sayed. Compensation schemes and Performance Analysis of IQ Imbalance in OFDM Receivers [J]. IEEE Trans. on Signal Processing (S1053-587X),2005,53(8):3257-3268.

[10] Fouladifard S,Shafiee H. On adaptive cancellation of IQ mismatch in OFDM receivers[C]//IEEE International Conference on Acdoustics,Speech,and Signal Processing,Hong Kong,China,April 6-10,2003:564-567.

[11] Kirkland W R,Teo K H. I/ Q distortion correction for OFDM direct conversion receiver [J]. Electronics Letters (S0013-5194),2003,39(1):131-133.

[12] PENG W R,ZHANG Bo,WU Xiao-xia,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[C]// 34th European Conference on Optical Communication,Brussels,Belgium,Sept 21-25,2008:1-2.

[13] MA Y,Shieh W,YANG Qi. Bandwidth-Efficient 21.4 Gb/s Coherent Optical 2×2 MIMO OFDM Transmission[C]//OFC/NFOEC 2008,San Diego,CA,Feb 24-28,2008:59