Optical Networks - _Problems6_92

# Consider a four node linear network with nodes a b c

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Consider a four-node linear network with nodes A, B, C, and D in that order. We have three wavelengths λ 1 , λ 2 , λ 3 available and are given OADMs that drop two fixed channels. That is, we can put in OADMs that drop either λ 1 , λ 2 , or λ 2 , λ 3 , or λ 1 , λ 3 . Now consider the situation where we need to set up the following lightpaths: AB, BC, CD, AC, BD. What OADMs would you deploy at each of the nodes? Suppose at a later point the lightpath traffic changes and now we need to replace lightpaths AC and BD by AD and BC. What changes would you have to make to support this new traffic? 7.3 Consider a linear network with serial OADMs. Assume that the transmit power is 0 dBm; the minimum received power is 30 dBm; and each OADM has a passthrough loss of 2 dB, a loss of 1 dB for the drop path, and a loss of 1 dB for the add path. Assume that the adjacent channel suppression offered by each OADM is 20 dB and that at the receiver the adjacent channel power must be at least 15 dB less than the desired signal power. (a) Write a computer program that takes as its input the set of lightpaths in the network and their wavelengths, the loss between each pair of adjacent nodes, and determines whether each lightpath is feasible or not. The program should also determine any wavelength conﬂicts, that is, if two lightpaths overlap and are assigned the same wavelength.

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