Optical Fiber Communications 4th Edition by Gerd Keiser

Exercise 8

An engineer needs to design a four-wave­length WDM system using a dispersion-shifted fiber that has a zero-dispersion point at 1550 nm. The four wavelengths need to be in the 193.1- to-194.1-THz band on a 100-GHz grid. Where should these wavelengths be placed so that none of the four-wave mixing components interfere with any transmission wavelength