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Unformatted text preview: demulitiplexer with inputs at 1 and 2 at port 1. At wavelength 1 , the coupling coefficient has the value 2 rad/mm. This wavelength is coupled entirely to port 3. Wavelength 2 is transmitted entirely to port 2. a) Compute the interaction length. b) Compute the value of the coupling coefficient at 2 . c) Compute the value of the coupling length C L at 2 . Problem 4: In an AWG, the crosstalk is 30dB between adjacent fibers at a channel wavelength of 1550 nm. The signal power in fiber x is 0.1 mW and the signal power in fiber y is 0.01 mW. For the 1550 nm signals, compute the amount of power coupled into each of the two fibers from the others. Compute the ratio of the power in the desired signal divided by the power in the unwanted coupled signal in each fiber. Express this ratio in dB. This ratio is a measure of the quality of the desired signal....
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 Spring '11
 kasab

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