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.