100-Tb/s-Class C+L+U-Band NZ-DSF Transmission With Closed-Form- GN-Model-Based Launch Power Optimization
Kosuke Kimura, Shimpei Shimizu, Takayuki Kobayashi, Akira Kawai, Masanori Nakamura, Masashi Abe, Takushi Kazama, Takeshi Umeki, Munehiko Nagatani, Hitoshi Wakita, Yuta Shiratori, Fukutaro Hamaoka, Hiroshi Yamazaki, Hiroyuki Takahashi, Yutaka Miyamoto
Abstract
We investigate 100-Tb/s-class C+L+U-band 14.85-THz bandwidth inline-amplified transmission over non-zero-dispersion-shifted fiber (NZ-DSF). The WDM signal bandwidth is extended to the U-band away from the zero-dispersion wavelength to boost the total throughput. The bandwidth extension to the U-band is enabled by a U-band repeater composing periodically poled lithium-niobate-based optical parametric amplifiers (PPLN-OPAs) and erbium-doped fiber amplifiers (EDFAs). The launch power of the C+L+U-band WDM signal is optimized by calculation accounting for stimulated Raman scattering and the wavelength-dependent accumulation of amplified spontaneous emission noise from PPLN-OPAs and EDFAs and nonlinear interference from NZ-DSF transmission to maximize the total throughput. To select an appropriate calculation method for launch power optimization, we analyze the impact of multi-channel interference, which is ignored in most closed-form expressions of the Gaussian noise (GN) model. We experimentally demonstrate net bitrates of 115.6 and 101.4 Tb/s after 240- and 400-km NZ-DSF transmission with bandwidth extension to the U-band and launch power optimization using a closed-form GN model.