Abstract

In this Letter, we show numerically and experimentally that multipath interference can be reduced significantly by distributed Raman amplification (DRA) in quasi-single-mode transmission using few-mode fibers, owing to the extra differential mode attenuation induced between the fundamental mode and higher-order modes. The experimental results show that the required number of equalization taps can be reduced by 1.6 times. Moreover, by carefully optimizing the intensity overlap between the LP₀₁ and LP₁₁ modes through structural adjustment of the two-mode fiber, a 3.5-times reduction in the required number of taps can be obtained.

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