title: Terabit Nyquist PDM-32QAM signal transmission with training sequence based time domain channel estimation.
abstract: We propose a time domain structure of channel estimation for coherent optical communication systems, which employs training sequence based equalizer and is transparent to arbitrary quadrature amplitude modulation (QAM) formats. Enabled with this methodology, 1.02 Tb/s polarization division multiplexed 32 QAM Nyquist pulse shaping signal with a net spectral efficiency of 7.46 b/s/Hz is transmitted over standard single-mode fiber link with Erbium-doped fiber amplifier only amplification. After 1190 km transmission, the average bit-error rate is lower than the 20% hard-decision forward error correction threshold of 1.5 × 10(-2). The transmission distance can be extended to 1428 km by employing intra-subchannel nonlinear compensation with the digital back-propagation method.
authors.forename: Fan
authors.initials: F
authors.lastname: Zhang
authors.forename: Dan
authors.initials: D
authors.lastname: Wang
authors.forename: Rui
authors.initials: R
authors.lastname: Ding
authors.forename: Zhangyuan
authors.initials: Z
authors.lastname: Chen
mesh_terms: D000669:Amplifiers, Electronic; D004867:Equipment Design; D005336:Fiber Optic Technology / Q000295:instrumentation*; D012815:Signal Processing, Computer-Assisted; D013685:Telecommunications / Q000295:instrumentation*