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By using cw laser diodes operating at 1.26 and 1.34 microm, the cross talk caused by stimulated Raman scattering in a 21-km single-mode fiber was measured to be -25.2 dB at a pump-power level of 1.0 mW. The Raman-gain coefficient was calculated to be 0.57 x 10(-11) cm/W, which is in good agreement with previously reported values measured with high-power pulsed lasers.
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Akira Tomita (1983) studied this question.
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