[1] [1] HAYEE M I,WILLNER A E.NRZ versus RZ in 10-40-Gb/s dispersion-managed WDM transmissionsystems［J］.IEEE Photonics Technology Letters,1999,11(8):991-993.

[2] [2] HE Jing,CHEN Lin,WEN Shuang-chun.Performance research on 40 Gb/s DPSK format against polarization-mode dispersion［J］.Acta Photonica Sinica,2009,38(3):660-664.

[3] [3] GRIFFIN R A,CARTER A C,COMPONENTS M O,et al.Optical differential quadrature phase-shift key (oDQPSK) for high capacity optical transmission［C］.OSA Proc Opt Fiber Commun Conf (OFC),Anaheim:LEOS,2002:WX6.

[4] [4] YUAN Fu-lai,LIU Han-kui,XIAO Shun-wen,et al.Evaluation of outage probability of optical communication system impaired by polarization effects［J］.Acta Photonica Sinica,2009,38(2):329-333.

[5] [5] WALKLIN S,CONRADI J.Multilevel signaling for increasing the reach of 10 Gb/s lightwave systems［J］. IEEE Journal of Lightwave Technology,1999,17(11):2235-2248.

[6] [6] HONGOU J,KASAI K,YOSHIDA M,et al.1 Gsymbol/s 64 QAM coherent optical transmission over 150 km with a spectral efficiency of 3 bit/s/Hz［C］.OSA Proc Opt Fiber Commun Conf (OFC),mAnaheim:LEOS,2007:OMP3.

[7] [7] NAKAZAWA M.Challenges to FDM-QAM coherent transmission with ultrahigh spectral efficiency［C］.OSA Proc Europ Conf Opt Commun (ECOC),Brussels:LEOS,2008:Tu.1.E.1.

[8] [8] WINZER P J,ESSIAMBRE R J.Advanced optical modulation formats［J］.Proceedings of the IEEE,2006,94(5):952-985.

[9] [9] SERBAY M,WREE C,ROSENKRANZ W.Experimental Investigation of RZ-8DPSK at 3x 10.7 Gb/s［C］.The 18th Annual Meeting of the IEEE,Sydney:LEOS,2005:483-484.

[10] [10] AGRAWAL G P.Fiber-optic communication systems［M］.3rd ed.New York:John Wiley & Sons,Inc.,2002.