Optical Fiber Communications 4th Edition by Gerd Keiser

Exercise 7

Consider a 1550-nm optical source that has a 40-MHz linewidth. Suppose we have a single-mode fiber that has a 72- m 2 effective area and a 0.2-dB/km attenuation at 1550 nm. Assuming that the polarization factor b = 2 and that the Brillouin gain coefficient is g B = 4 × 10 -11 m/W, what is the threshold power for stimulated Brillouin scattering at 1550 nm for a 40-km link If the attenuation for this fiber is 0.4 dB/km at 1310 nm and all other parameters are the same, what is the threshold power for stimulated Brillouin scattering at 1310 nm