[1] [1] P. Winzer, IEEE Commun. 48, 26 (2010).

[2] [2] M. S. Faruk and K. Kazuro, Opt. Express 19, 12789 (2011).

[3] [3] Y. Xu, Y. Qiao, and Y. Ji, Chin. Opt. Lett. 10, 110601 (2012).

[4] [4] C. K. C. Chan, Optical Performance Monitoring: Advanced Techniques for Next-Generation Photonic Networks (Academic Press, 2010).

[5] [5] Z. Huang, F. Zhang, and Z. Chen, Chin. Opt. Lett. 11, 060601 (2013).

[6] [6] R. Elschner, F. Frey, C. Meuer, J. Fischer, S. Alreesh, C. Schmidt-Langhorst, L. Molle, T. Tanimura, and C. Schubert, Opt. Express 20, 28786. (2012).

[7] [7] F. Pittala and J. A. Nossek, in Proceedings of IPC, 129 (2013).

[8] [8] F. Pittala, Q. Juan, M. Msallem, J. A. Nossek, in Proceedings of 39th European Conference and Exhibition on IET 1 (2013).

[9] [9] C. Do, A. Tran, C. Zhu, S. Chen, T. Anderson, D. Hewitt, and E. Skafidas, IEEE Photon. J. 4, 2037 (2012).

[10] [10] F. Pittalà, F. Hauske, Y. Ye, N. Gonzalez, and I. Monroy, in Proceedings of ICTON We.D1.5, (2011).

[11] [11] M. Golay, IRE Trans. Inf. Theory 7, 82 (1961).

[12] [12] D. Chu, IEEE Trans. Inf. Theory 18, 531 (1972).

[13] [13] M. Morsy-Osman, Q. Zhuge, M. Chagnon, X. Xu, and D. Plant, in Proceedings of OFC/NFOEC 2013 OTu3I.6, (2013).

[14] [14] M. Yan, Z. Tao, T. Takahito, S. Oda, Y. Cao, Y. Zhao, T. Hoshida, and J. Rasmussen, in Proceedings of ECOC, 1 (2013).

[15] [15] Y. Qiao, Z. Wang, and Y. Ji, Chin. Opt. Lett. 8, 888 (2010).

[16] [16] S. Alamouti, IEEE J. Sel. Areas Commun. 16, 1451 (1998).

[17] [17] F. Hauske, M. Kuschnerov, B. Spinnler, and B. Lankl, J. Lightwave Technol. 27, 3623 (2009).

[18] [18] G. P. Agrawal, Nonlinear Fiber Optics (Springer, 2000).

[19] [19] J. Van de Beek, M. Sandell, and P. Borjesson, IEEE Trans. Signal Process. 45, 1800 (1997).