Optical Fiber Communications 4th Edition by Gerd Keiser

Exercise 5

A wave is specified by y = 8 cos 2(2 t- 0.8 z ), where y is expressed in micrometers and the propagation constant is given in m -1. Find ( a ) the amplitude, ( b ) the wavelength, ( c ) the angular frequency, and ( d ) the displacement at time t = 0 and z = 4 µm.