[1] Klinkowski M, Walkowiak K. Routing and spectrum assignment in spectrum sliced elastic optical path network[J]. IEEE Communications Letters, 15, 884-886(2011).

[2] Ujjwal, Thangaraj J. Review and analysis of elastic optical network and sliceable bandwidth variable transponder architecture[J]. Optical Engineering, 57, 110802(2018).

[3] Alyatama A. Relative cost routing and spectrum allocation in elastic optical networks[J]. Journal of Optical Communications and Networking, 12, 38-49(2020).

[4] Oki E, Sato T, Chatterjee B C. Spectrum fragmentation management in elastic optical networks[C](2019).

[5] Yin Y W, Zhang M Y, Zhu Z Q et al. Fragmentation-aware routing, modulation and spectrum assignment algorithms in elastic optical networks[C], OW3A.5(2013).

[6] Fukuda T, Liu L, Baba K I et al. Fragmentation-aware spectrum assignment for elastic optical networks with fully-distributed GMPLS[C], Tu2B.3(2015).

[7] Chatterjee B C, Ba S, Oki E. Fragmentation problems and management approaches in elastic optical networks: a survey[J]. IEEE Communications Surveys & Tutorials, 20, 183-210(2018).

[8] Shang P P, Ren D P, Zhang J et al. Service-oriented spectrum defragmentation algorithm with exact migration in elastic optical networks[J]. Optical Communication Technology, 45, 51-57(2021).

[9] Zhang J, Bao B W, Yao Q Y et al. 3D fragmentation metric and RCSA scheme for space division multiplexing elastic optical networks[J]. IEEE Access, 8, 201595-201605(2020).

[10] Yousefi F, Rahbar A G, Yaghubi-Namaad M. Fragmentation-aware algorithms for multipath routing and spectrum assignment in elastic optical networks[J]. Optical Fiber Technology, 53, 102019(2019).

[11] Horota A, Figueiredo G B, da Fonseca N L S. Routing and spectrum assignment algorithm with fragmentation minimization in elastic optical networks[C], 436-442(2014).

[12] Batham D, Yadav D S, Prakash S. Least loaded and route fragmentation aware RSA strategies for elastic optical networks[J]. Optical Fiber Technology, 39, 95-108(2017).

[13] Liu H L, Hu H, Xiong C L et al. Resources balancing algorithm based on the time-frequency fragment awareness for virtual optical network mapping[J]. Journal of Electronics & Information Technology, 40, 2345-2351(2018).

[14] Singh S K, Jukan A. Efficient spectrum defragmentation with holding-time awareness in elastic optical networks[J]. Journal of Optical Communications and Networking, 9, B78-B89(2017).

[15] Yang F T, Wang L, Wang L Q et al. Holding-time-aware spectrum allocation algorithm for elastic optical networks[J]. Optical Fiber Technology, 41, 155-162(2018).

[16] Wang R, Mukherjee B. Spectrum management in heterogeneous bandwidth networks[C], 2907-2911(2012).