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We experimentally demonstrate simultaneous 3R regeneration of 4 Â 40-Gbit/s WDM channels, which is based on the four-wave mixing (FWM) in a single dispersionshifted fiber. The multichannel 3R regeneration performance is validated by bit-error rate (BER) measurements. Receiver powers at a BER of 10 À9 are improved by 5.2 dB, 4.8 dB, 3.3 dB, and 3.9 dB for the four WDM channels, respectively. Mitigation of the interchannel nonlinearities is achieved mainly through an interchannel 0.5-bit slotdoi:10.1109/jphot.2012.2215955 fatcat:2kqcid4e7bdelbbd2tvm2yvlji