[1] Roberts K, Zhuge Q, Monga I, Gareau S, Laperle C. Beyond 100 Gb/s: capacity, flexibility, and network optimization. Journal of Optical Communications and Networking, 2017, 9(4): C12–C24
[2] Abd El-Rahman A I, Cartledge J C. Evaluating the impact of geometric constellation shaping on the mutual information of multidimensional formats in fully loaded systems. Journal of Lightwave Technology, 2018, 36(3): 712–720
[3] Rezania A, Cartledge J C, Bakhshali A, Chan W Y. Compensation schemes for transmitter and receiver based pattern-dependent distortion. IEEE Photonics Technology Letters, 2016, 28(22): 2641–2644
[4] Kashi S, Cartledge J C, Gao Y, Rezania A, O’Sullivan M, Laperle C, Borowiec A, Roberts K. High resolution characterization of the spectral broadening due to fiber nonlinearities. IEEE Photonics Technology Letters, 2016, 28(21): 2375–2378
[5] Cartledge J C, Matos F, Laperle C, Borowiec A, O’Sullivan M, Roberts K. Use of extreme value statistics to assess the performance implications of cascaded ROADMs. Journal of Lightwave Technology, 2017, 35(23): 5208–5214
[6] Zhang B, Malouin C, Liu S, Schmidt T J, Liao G, Wang P, Washburn H, Yuan J. Penalty-free transmission of 127-Gb/s coherent PM-QPSK over 1500-km of NDSF with 10 cascaded 50-Gz ROADMs. In: Proceedings of Optical Fiber Communication, collocated National Fiber Optic Engineers Conference (OFC/NFOEC). San Diego, CA, USA: IEEE, 2010, paper NTuC5
[7] Hsueh Y T, Stark A, Liu C, Detwiler T, Tibuleac S, Filer M, Chang G K, Ralph S E. Passband narrowing and crosstalk impairments in ROADM-enabled 100G DWDM networks. Journal of Lightwave Technology, 2012, 30(24): 3980–3986
[8] Ghazisaeidi A, Tran P, Brindel P, Bertran-Pardo O, Renaudier J, Charlet G, Bigo S. Impact of tight optical filtering on the performance of 28 Gbaud Nyquist-WDM PDM-8QAM over 37.5 GHz grid. In: Proceedings of Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC). Anaheim, CA, USA: IEEE, 2013, paper OTu3B.6
[9] Rahman T, Napoli A, Rafique D, de Man E, Bohn M, Okonkwo C M, de Waardt H. Mitigation of filtering cascade penalties using spectral shaping in optical nodes. In: Proceedings of European Conference on Optical Communication (ECOC). Cannes, France: IEEE, 2014, paper P.4.19
[10] Zhang J, Yu J, Dong Z, Chien H C, Jia Z. 10×440-Gb/s super- Nyquist-filtered signal transmission over 3000-km fiber and 10 cascaded ROADMs with 100-GHz grid based on single-carrier ETDM 110-GBaud QPSK. In: Proceedings of European Conference on Optical Communication (ECOC). Cannes, France: IEEE, 2014, paper P.5.16
[11] Idler W, Buchali F, Schmalen L, Schuh K, Buelow H. Hybrid modulation formats outperforming 16QAM and 8QAM in transmission distance and filtering with cascaded WSS. In: Proceedings of Optical Fiber Communications Conference and Exhibition (OFC). Los Angeles, CA, USA: IEEE, 2015, paper M3G.4
[12] Rahman T, Rafique D, Spinnler B, Napoli A, Bohn M, Koonen AM J, Okonkwo C M, de Waardt H. Digital subcarrier multiplexed hybrid QAM for data-rate flexibility and ROADM filtering tolerance. In: Proceedings of Optical Fiber Communication Conference and Exhibition (OFC). Anaheim, CA, USA: IEEE, 2016, paper Tu3K.5
[13] Peng W R, Zhu Y, Samina C, Kan C, Li Z, Cui Y, Zhu F, Bai Y. Adaptive noise whitening filter and its use with maximum likelihood sequence estimation. In: Proceedings of Optical Fiber Communication Conference and Exhibition (OFC). Anaheim, CA, USA: IEEE, 2016, paper Tu3K.7
[14] Fabrega JM, Svaluto Moreolo M, Martin L, Chiadò Piat A, Riccardi E, Roccato D, Sambo N, Cugini F, Potì L, Yan S, Hugues-Salas E, Simeonidou D, Gunkel M, Palmer R, Fedderwitz S, Rafique D, Rahman T, de Waardt H, Napoli A. On the filter narrowing issues in elastic optical networks. Journal of Optical Communications and Networking, 2016, 8(7): A23–A33
[15] Zhou X, Zhuge Q, Qiu M, Xiang M, Zhang F,Wu B, Qiu K, Plant D V. On the capacity improvement achieved by bandwidth-variable transceivers in meshed optical networks with cascaded ROADMs. Optics Express, 2017, 25(5): 4773–4782
[16] Gringeri S, Egorov R, Basch B, Wellbrock G, Zhang B, Malouin C, Liu S, Ibragimov E, Khatana S, Lofland R, Marcoccia R, Schmidt T, Pulikkaseril C, Roelens M, Fabiny L, Frisken S. Real-time 127-Gb/s coherent PM-QPSK transmission over 1000 km NDSF with>10 cascaded 50 GHz ROADMs. In: Proceedings of European Conference and Exhibition on Optical Communication (ECOC). Torino, Italy: IEEE, 2010, paper P4.09
[17] Bhandare S, Wang Z, Kim K, Colyar M, Ereifej H. Narrow optical filtering tolerance of 127-Gb/s DP-QPSK utilizing real-time DSP with 20 cascaded 50-GHz filters in the presence of 40,200-ps/nm chromatic dispersion. In: Proceedings of Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC). Anaheim, CA, USA: IEEE, 2013, paper NM2E.5
[18] Filer M, Tibuleac S. N-degree ROADM architecture comparison: broadcast-and-select versus route-and-select in 120 Gb/s DP-QPSK transmission systems. In: Proceedings of Optical Fiber Communications Conference and Exhibition (OFC). San Francisco, CA, USA: IEEE, 2014, paper Th1I.2
[19] Bertran-Pardo O, Zami T, Lavigne B, Le Monnier M. Spectral engineering technique to mitigate 37.5-GHz filter-cascade penalty with real-time 32-GBaud PDM-16QAM. In: Proceedings of Optical Fiber Communications Conference and Exhibition (OFC). Los Angeles, CA, USA: IEEE, 2015, paper M3A.3
[20] Pan J, Tibuleac S. Real-time pre-compensation of ROADM filtering using a generalized pre-emphasis filter. In: Proceedings of IEEE Photonics Conference (IPC).Waikoloa, HI, USA: IEEE, 2016, 548–549
[21] Cartledge J C, Doggart C, O’Sullivan M, Laperle C, Borowiec A, Roberts K. Effect of statistical variations in the response of cascaded ROADMs on 100 Gb/s DP QPSK system performance. In: Proceedings of European Conference on Optical Communication (ECOC). Dusseldorf, Germany: VDE, 2016, paper W.4.P1.SC5.58
[22] Pan J, Tibuleac S. Real-time ROADM filtering penalty characterization and generalized precompensation for flexible grid networks. IEEE Photonics Journal, 2017, 9(3): 7202210
[23] Pan J, Tibuleac S. Real-time investigation and prediction of transmission penalties for PDM-8QAM/16QAM super-channels in flexible grid DWDM networks. In: Proceedings of Optical Fiber Communications Conference and Exhibition (OFC). Los Angeles, CA, USA: IEEE, 2017, paper M2E.5
[24] Rahman T, Napoli A, Rafique D, Spinnler B, Kuschnerov M, Lobato I, Clouet B, Bohn M, Okonkwo C, de Waardt H. On the mitigation of optical filtering penalties originating from ROADM cascade. IEEE Photonics Technology Letters, 2014, 26(2): 154–157
[25] Pfau T, Hoffmann S, Noe R. Hardware-efficient coherent digital receiver concept with feedforward carrier recovery for M-QAM constellations. Journal of Lightwave Technology, 2009, 27(8): 989–999
[26] Savory S, Payne F, Hadjifotiou A. Estimating outages due to polarization mode dispersion using extreme value statistics. Journal of Lightwave Technology, 2006, 24(11): 3907–3913
