title: Theoretical and experimental analysis of Inter-channel crosstalk between TWDM and fronthaul wavelengths due to stimulated Raman scattering.
abstract: In this paper, we analyze the stimulated Raman scattering (SRS) effect between multiple TWDM downstream wavelengths in L band and multiple fronthaul wavelength channels in C band theoretically, and investigate its impact on fronthaul signals experimentally for the first time. The impact includes two aspects, one is SRS-induced power depletion and the other is the eye diagram distortion caused by the nonlinear Raman crosstalk. Experimental results show that, up to 1-dB power depletion would be introduced to each fronthaul wavelength channel with the launch power per TWDM channel varying from 8-dBm to 15-dBm. In addition, due to the "1" level broadening of the non-return-to-zero on-off keying (NRZ-OOK) eye diagram, the receiving sensitivity with 20-km standard single mode fiber (SSMF) transmission is decreased by ~1-dB. Therefore, a total of ~2-dB power penalty would be imposed on fronthaul signals when co-transmitting with TWDM downstream signals in the same feeder fiber.
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.forename: Hao
authors.initials: H
authors.lastname: He
authors.forename: Weisheng
authors.initials: W
authors.lastname: Hu