1. Ji Y, Wang X, Zhang S, Gu R, Guo T, Ge Z. Dual-layer efficiency enhancement for future passive optical network. Science China Information Sciences, 2016, 59(2): 1–13
2. Ji Y, Zhang J, Zhao Y, Yu X, Zhang J, Chen X. Prospects and research issues in multi-dimensional all optical networks. Science China Information Sciences, 2016, 59: 101301
3. Wang H, Zhao J, Li H, Ji Y. Opaque virtual network mapping algorithms based on available spectrum adjacency for elastic optical networks. Science China Information Sciences, 2016, 59(4): 1–11
4. Stiller B, Onishchukov G, Schmauss B, Leuchs G. Phase regeneration of a star-8QAM signal in a phase-sensitive amplifier with conjugated pumps. Optics Express, 2014, 22(1): 1028–1035
5. Yang J Y, Akasaka Y, Sekiya M. Optical phase regeneration of multi-level PSK using dual-conjugate-pump degenerate phasesensitive amplification. In: Proceedings of 38th European Conference and Exhibition on Optical Communications (ECOC). Amsterdam, 2012, 1–3