[1] Tsukamoto S, Katoh K, Kikuchi K. Coherent demodulation of optical multilevel phase-shift-keying signals using homodyne detection and digital signal processing. IEEE Photonics Technology Letters, 2006, 18(10): 1131-1133
[2] Laperle C, Villeneuve B, Zhang Z, McGhan D, Sun H, O’Sullivan M. WDM performance and PMD tolerance of a coherent 40-Gbit/s dual-polarization QPSK transceiver. Journal of Lightwave Technology, 2008, 26(1): 168-175
[3] Ip E, Lau A P T, Barros D J F, Kahn J M. Coherent detection in optical fiber systems. Optics Express, 2008, 16(2): 753-791
[4] Chang S H, Chung H S, Kim K. Impact of quadrature imbalance in optical coherent QPSK receiver. IEEE Photonics Technology Letters, 2009, 21(11): 709-711
[5] Koc U, Leven A, Chen Y, Kaneda N. Digital coherent quadrature phase-shift-keying (QPSK). In: Proceedings of Optics Fiber Conference (OFC). 2006, OThI1
[6] Halir R, Flusser J. Numerically stable direct least squares fitting of ellipse. In: Proceedings of International Conference in Central Europe on Computer Graphics, Visualization and Interactive Digital Media. 1998
[7] Valkama M, Renfors M, Koivunen V. Advanced methods for I/Q imbalance compensation in communication receivers. IEEE Transactions on Signal Processing, 2001, 49(10): 2335-2344
[8] Petrou C S, Vgenis A, Kiourti A, Roudas I, Hurley J, Sauer M, Downie J, Mauro Y, Raghavan S. Impact of transmitter and receiver imperfections on the performance of coherent optical QPSK communication systems. In: Proceedings of LEOS 2008. 2008, TuFF3
[9] Chang S H, Chung H S, Kim K. Digital non-data-aided symbol synchronization in optical coherent intradyne reception. Optics Express, 2008, 16(19): 15097-15103
[10] Leven A, Kaneda N, Koc U V, Chen Y K. Frequency estimation in intradyne reception. IEEE Photonics Technology Letters, 2007, 19(6): 366-368
[11] Ly-Gagnon D S, Tsukamoto S, Katoh K, Kikuchi K. Coherent detection of optical quadrature phase-shift keying signals with carrier phase estimation. Journal of Lightwave Technology, 2006, 24(1): 12-21