[1] Winzer P J. Beyond 100G ethernet[J]. IEEE Communications Magazine, 48, 26-30(2010).
[2] Reis J D, Shukla V, Stauffer D R et al. Technology options for 400G implementation. [C]∥Optical Networking Forum (OIF). [S.l.: s.n.](2015).
[3] Seimetz M. Fiber propagation effects[M]. ∥High-order modulation for optical fiber transmission. Springer series in optical sciences. Berlin, Heidelberg: Springer, 143, 143-154(2009).
[11] Pfau T, Hoffmann S, Noé R. Hardware-efficient coherent digital receiver concept with feedforward carrier recovery for M-QAM constellations[J]. Journal of Lightwave Technology, 27, 989-999(2009).
[17] Xiang Q, Yang Y F, Zhang Q et al. Adaptive and joint frequency offset and carrier phase estimation based on Kalman filter for 16QAM signals[J]. Optics Communications, 430, 336-341(2019).