PDM-16QAM WDM Transmission with 2nd-Order Forward-Pumped Distributed Raman Amplification Utilizing Incoherent Pumping. - Takayuki Kobayashi; Masahito Morimoto; Haruki Ogoshi; Junji Yoshida; Shigehiro Takasaka; Yutaka Miyamoto (OFC, 2019)