Smith R G
Appl Opt. 1972 Nov 1;11(11):2489-94. doi: 10.1364/AO.11.002489.
The effect of stimulated Raman and Brillouin scattering on the power handling capacity of optical fibers is considered and found to be important especially when low loss optical fibers are used. A critical power below which stimulated effects may be neglected is defined for forward and backward Raman scattering and for backward Brillouin scattering. This critical power is determined by the effective core area A, the small signal attenuation constant of the fiber alpha, and the gain coefficient for the stimulated scattering process (gamma0), by the approximate relation P(crit) approximately 20Aalpha/(gamma0). For a fiber with 20-dB/km attenuation and an area of 10(-7) cm(2)P(crit) approximately 35 mW for stimulated Brillouin scattering. For stimulated Raman scattering P(crit) is approximately two orders of magnitude higher. It is concluded that these effects must be considered in the design of optical communication systems using low loss fibers.
研究了受激拉曼散射和布里渊散射对光纤功率处理能力的影响，发现该影响尤为重要，特别是在使用低损耗光纤时。针对前向和后向拉曼散射以及后向布里渊散射，定义了一个临界功率，低于该临界功率时，受激效应可忽略不计。该临界功率由有效纤芯面积A、光纤的小信号衰减常数α以及受激散射过程的增益系数（γ0）决定，其近似关系为P(crit) ≈ 20Aα / (γ0)。对于衰减为20 dB/km且面积为10^(-7) cm²的光纤，受激布里渊散射的P(crit)约为35 mW。对于受激拉曼散射，P(crit)大约高两个数量级。得出的结论是，在设计使用低损耗光纤的光通信系统时，必须考虑这些效应。
