[1] [1] ting, 2018, 6(3): 785-799.

          YE T, LEE T T, GE M, et al. Modular AWG-based Interconnection for Large-Scale Data Center Networks[J]. IEEE Transactions on Cloud Compu-

[2] [2] KACHRIS C, TOMKOS I. A Survey on Optical Interconnects for Data Centers[J]. IEEE Communications Surveys & Tutorials, 2012, 14(4): 1021-1036.

[3] [3] RA Y, RHEE J K K, BANG J, et al. Photonic-Frame-Based TCP proxy architecture in optically interconnected data center networks[J]. Computer Networks, 2018, 147: 14-26.

[4] [4] CHENG Y, FIORANI M, LIN R, et al. POTORI: A Passive Optical Top-of-Rack Interconnect Architecture for Data Centers[J]. Journal of Optical Communications and Networking, 2017, 9(5): 401-411.

[5] [5] GONG Y, LU Y, HONG X, et al. Passive Optical Interconnects at Top of the Rack for Data Center Networks[J]. optics express, 2014, 23(6): 78-83.

[6] [6] HAMMADI A, El-GORASHI T E H, ELMIRGHANIl J M H. High performance AWGR PONs in data centre networks[C]//International Conference on Transparent Optical Networks, July 5-9, 2015, Budapest, USA. Piscataway: IEEE, 2015: 1-5.

[7] [7] CHENG Yuxin, FIORANI M, WOSINSKA L, et al. Reliable and Cost Efficient Passive Optical Interconnects for Data Centers[J]. IEEE Communications Letters, 2015, 19(11): 1913-1916.

[8] [8] ALANI R A T, El-GORASHI T E H, ELMIRGHANI J M H. Virtual Machines Embedding for Cloud PON AWGR and Server Based Data Centres[C]// International Conference on Transparent Optical Networks, July 9-13, 2019, Angers, France. Piscataway: IEEE, 2019: 1-5.

[9] [9] WANG X, LU Y, BI M, et al. Data center optical interconnection based on IRZ-DPSK signal[C]//Asia Communications and Photonics Conference, October 26-29, 2018, Hangzhou, China. Piscataway: IEEE, 2018: 1-3.