Transmission Over 1050-km Few-Mode Fiber Based on Bidirectional Distributed Raman Amplification

We characterize the distributed Raman amplification in a 70-km three spatial-mode few-mode fiber with different pump configurations and demonstrate bidirectional pumped Raman amplification and 1050 km combined wavelength-division and spatial-division multiplexed transmission in the same fiber with a zero net gain fiber span.