[1] [1] F Buchali，V Aref，M Chagnon，et al. 1.52 Tb/s single carrier transmission supported by a 128 GSa/s SiGe DAC［C］. 2020 Optical Fiber Communications Conference and Exhibition（OFC），2020：1-3.

[2] [2] Bulow H，Rahman T，Buchali F，et al. Transmission of 4-D modulation formats at 28-Gbaud［C］//Optical Fiber Communication Conference. IEEE，2013：1-3.

[3] [3] Yamanaka S，Kobayashi T，Sano A，et al. 11 × 171 Gb/s PDM 16-QAM transmission over 1 440 km with a spectral efficiency of 6.4 b/s/Hz using high-speed DAC［C］. European Conference on Optical Communication，2010：5-10.

[4] [4] Xiang Zhou，Lynn E Nelson，Peter Magill，et al. PDM-Nyquist-32 QAM for 450-Gb/s per-channel WDM transmission on the 50 GHz ITU-T grid［J］. Journal of Lightwave Technology，2012，30（4）：553-559.

[5] [5] Danish Rafique，Andrew D Ellis. Nonlinear and ROADM induced penalties in 28 Gbaud dynamic optical mesh networks employing electronic signal processing［J］. Optics Express，2011，19（18）：16739-16748.

[6] [6] Xiaolan J Zhang ，Martin Birk ，Angela Chiu. Bridge-and-roll demonstration in GRIPhoN（globally reconfigurable intelligent photonic network）［C］. Proc. OFC/NFOEC，2010：1-3.

[7] [7] O Gerstel，M Jinno，A Lord，et al. Elastic optical networking：A new dawn for the optical layer［J］. IEEE Commun.Mag.，2012，50（2）：12-20.

[8] [8] R Shankar，M Florja′nczyk，T J Hall，et al. Multi degree ROADM based on wavelength selective switches：Architectures and scalability［J］. Opt. Commun.，279（1）：94-100.

[9] [9] Talha Rahman，Antonio Napoli. On the mitigation of optical filtering penalties originating from ROADM cascade［J］.IEEE Photonics Technology Letters，2014，26（2）：154-157.