[1] [1] MIROSAW K, PIOTR L, KRZYSZTOF W. Survey of resource allocationschemes and algorithms in spectrally-spatially flexible opticalnetworking[J]. Optical Switching and Networking, 2018, 27: 58-78.

[4] [4] XIONG Y, YE Y, ZHANG H, et al. Deep learning and hierarchicalgraph-assisted crosstalk-aware fragmentation avoidance strategy in spacedivision multiplexing elastic optical networks [J]. Optics Express, 2020, 28（3）: 2758-2777.

[5] [5] ZHEN W, HU J, CHEN Q, et al. Virtual optical network mappingapproaches with inter-core crosstalk in space division multiplexing elasticoptical data center networks [C]//2021 19th International Conference onOptical Communications and Networks (ICOCN). Qufu, China. Qufu: IEEE,2021: 1-4.

[8] [8] ERWAN P, SONG M, KARAKI J, et al. Multi-band OFDM transmissionat 100 Gbps with sub-band optical switching [J]. Journal of LightwaveTechnology, 2014, 32（12）: 2202-2219.

[9] [9] ARPANAEI F, ARDALANI N, BEYRANVAND H, et al. Three-dimen-sional resource allocation in space division multiplexing elastic opticalnetworks[J]. Journal of Optical Communications and Networking, 2018, 10（12）: 959-974.

[10] [10] ZHANG S, YEUNG K L. Dynamic service provisioning in space-divisionmultiplexing elastic optical networks[J]. Journal of Optical Communicationsand Networking, 2020,12（11）: 335-343.

[11] [11] CHANG J H, CHOI H G, CHUNG Y C. Achievable capacity improvementby using multi-level modulation format in trench-assisted multi-corefiber system[J]. Optics Express, 2013, 21（12}: 14262-14271.

[12] [12] FUJII S, HIROTA Y, TODE H, et al. On-demand spectrum and coreallocation for reducing crosstalk in multicore fibers in elastic opticalnetworks [J]. Journal of Optical Communications and Networking, 2014, 6（12）: 1059-1071.

[14] [14] CHRISTODOULOPOULOS K, TOMKOS I, VARIGOS E A. Routingand spectrum allocation in OFDM-based optical networks with elasticbandwidth allocation [C]//IEEE. Proceedings of 2010 IE