1. ITU-T G.989.1, “40-Gigabit-capable passive optical networks (NG-PON2): General requirements” (2013).
2. Space-division multiplexing in optical fibres
3. Becker, P. C., Olsson, N. A. and Simpson, J. R., Erbium-Doped Fiber Amplifiers: Fundamentals and Technology, Academic Press, Chap. 5 (1999).
4. 1.5 µm GaInAsP traveling-wave semiconductor laser amplifier
5. GaInNAs: A novel material for longwave length-range laser diodes with excellent high-temperature performance;Knodow,1996