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We experimentally demonstrate, for the first time, a second-order few-mode distributed Raman amplifier with 4 dB mode-equalized gain. The noise figure improvement of the LPoi andLPn modes are respectively 1.2 dB and 1.1 dB compared with first-order Raman amplification scheme. We also use optical time-domain reflectometer (OTDR) to measure the signal evolutions, and the results confirm the low noise...
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