## Abstract

By using cw laser diodes operating at 1.26 and 1.34 *μ*m, 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 × 10^{−11} cm/W, which is in good agreement with previously reported values measured with high-power pulsed lasers.

© 1983 Optical Society of America

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### Equations (4)

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(1)
$$\left(\frac{d}{\mathrm{d}Z}+{\gamma}_{s}\right){P}_{s}\left(Z\right)=\frac{g}{A}{P}_{p}\left(Z\right){P}_{s}\left(Z\right),$$
(2)
$${P}_{s}\left(L\right)={P}_{s}\left(0\right)\phantom{\rule{0.2em}{0ex}}\text{exp}\left[-{\gamma}_{s}L+\frac{g{P}_{p}\left(0\right)}{A{\gamma}_{p}}\left(1-{e}^{-{\gamma}_{p}L}\right)\right],$$
(3)
$$\begin{array}{ll}\beta \left(L\right)\hfill & \equiv \phantom{\rule{0.2em}{0ex}}{P}_{s}\left(L\right)/{P}_{so}\left(L\right)-1\hfill \\ \hfill & =\phantom{\rule{0.2em}{0ex}}\text{exp}\phantom{\rule{0.2em}{0ex}}\left[\frac{g{P}_{p}\left(0\right)}{A{\gamma}_{p}}\left(1-{e}^{-{\gamma}_{p}L}\right)\right]-1.\hfill \end{array}$$
(4)
$$\beta \left(L\right)=\frac{g{P}_{p}\left(0\right)}{A{\gamma}_{p}}\left(1-{e}^{-{\gamma}_{p}L}\right).$$