Consider a Mach-Zehnder fiber demultiplexer depicted in Figure 10-16b. Assume that n = 1.5000.
a. Find a difference in path length between the two arms of the fiber interferometer ΔL that will efficiently demultiplex a signal containing wavelength components λ1 = 1550.8 nm and λ2= 1550.0 nm. Assume that the λ1 component exits through Output 1. (Take care to ensure that your solution nearly satisfies both Eqs. (21) and (22) with integer m.)
b. If the path length difference is as found from part (a), through which output port would light of wavelength λ3 = 1551.6 nm exit the interferometer?
c. If the path length difference is as found from part (a), find the ratio of the irradiances exiting through the two output ports if the input signal has a wavelength of 1550.4 nm.
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