Optical Fiber Communications 4th Edition by Gerd Keiser

Exercise 12

Consider a wavelength multiplexer made from a series of thin-film filters as shown in Fig. 10.26. Assume the input optical power of each wavelength X 1 through X 4 is 1 mW. For each TFF let the throughput loss equal 1.0 dB and let the reflection loss be 0.4 dB. What is the power level of each wavelength Xj through X 4 emerging from the final thin-film filter TFF 4