[1] Sun Han, Wu K T, Roberts K. Real-time measurements of a 40Gbit/s coherent system[J]. Optics Express, 2008, 16(2): 873-879. [2] Pardo O B, Renaudier J, Mardoyan H, et al. Investigation of design options for overlaying 40Gb/s coherent PDM-QPSK channels over a 10Gb/s system infrastructure// OFC 2008. San Diego: , 2008. [3] Kuschnerov M, Hauske F N, Gourdon E, et al. Digital timing recovery for coherent fiber opticsystems//OFC 2008. San Diego: , 2008. [4] Fludger C R S, Duthel T, van den Borne D, et al. Coherent equalization and POLMUX-RZ-DQPSK for robust 100-GE transmission[J]. Journal of Lightwave Technology, 2008, 26(1): 64-72. [5] Tanimura T, Hoshida T, Oda S, et al. Digital clock recovery algorithm for optical coherent receivers operating independent of laser frequency offset// ECOC 2008. Brussels: , 2008: 35-36. [6] Oerder M, Meyr H. Digital filter and square timing recovery[J]. IEEE Trans on Comm, 1988, 36(5): 605-611. [7] Gardner F. A BPSK/QPSK timing-error detector for sampled receivers[J]. IEEE Trans on Comm, 1986, 34(5): 423-429. [8] Gardner F. Interpolation in digital modems—part I: fundamentals[J]. IEEE Trans on Comm, 1993, 41(3): 501-507. [9] Gardner F M. Interpolation in digital modems—part II: implementation and performance[J]. IEEE Trans on Comm, 1993, 41(6): 998-1008. [10] Gardner F M. 锁相环技术[M]. 姚剑清, 译. 北京:人民邮电出版社,2007. |