Field demonstration of a tunable WDM-PON system with novel SFP+ modules and centralized wavelength control. - Stephan Pachnicke; Stephen Mayne; B. Quemeneur; D. Sayles; H. Schwuchow; Jiannan Zhu; Adrian Wonfor; P. Marx; Mirko Lawin; M. Fellhofer; Richard Turner; P. Neuber; et al. (OFC, 2015)