Optical Fiber Communications 4th Edition by Gerd Keiser

Exercise 4

Consider a wavelength multiplexer made from circulators and fiber Bragg gratings as shown in Fig. 10.22. Assume the input optical power of each wavelength 1 through 4 is 1 mW. Let both the insertion loss and the throughput loss of each FBG be 0.25 dB, and let the insertion loss of a circulator be 0.6 dB. What is the power level of each wavelength 1 through 4 emerging from the final circulator C 4