Optical Fiber Communications 4th Edition by Gerd Keiser

تمرين 12

The optical power loss resulting from Rayleigh scattering in a fiber can be calculated from either Eq. (3.4 a ) or Eq. (3.4 b ). Compare these two equations for silica ( n = 1.460 at 630 nm), given that the fictive temperature T f is 1400 K, the isothermal compressibility T is 6.8 × 10 -12 cm 2 / dyn, and the photoelastic coefficient is 0.286. How does this agree with measured values ranging from 3.9 to 4.8 dB/km at 633 nm