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We propose a novel lossless transmission line configuration which exhibits significantly small signal power variation along the line by Raman amplification. A hybrid line consisting of two fibers with different Raman gain properties is theoretically investigated, and it is shown that signal power deviation can be suppressed to only 1.2 dB in a 50-km span. Validity of the proposed hybrid line is confirmed by experiments.
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Okuno et al. (2001) studied this question.
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