Optical Networks - _Problems6_92

B what is the maximum number of oadms that a

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(b) What is the maximum number of OADMs that a lightpath can pass through before it needs to be regenerated? Plot this number as a function of the total link loss in the network. (c) Plot the output of your program for a network with five nodes numbered sequentially from 1 to 5, link loss of 5 dB between nodes, and the following sets of lightpaths and wavelength assignments: ( 1 , 5 , λ 1 ) , ( 2 , 4 , λ 2 ) , ( 3 , 5 , λ 3 ) , ( 1 , 4 , λ 4 ) . 7.4 This problem explores architectures for constructing fully reconfigurable OADMs. Consider the parallel architecture shown in Figure 7.7(d). How would you build a fully reconfigurable parallel OADM like this one, wihtout using a large optical switch? You are allowed to use tunable filters, passive splitters and combiners, and small ( 2 × 2 ) optical switches. These solutions need to meet properties (1) and (2) specified for the ideal OADM described in Section 7.3. With respect to property (3), you still need to keep the loss fixed, regardless of how many channels are dropped or added, but you are allowed to have a reasonably high value for this loss. Compare the pros and cons of your solution versus the one in Figure 7.7(d). 7.5 You have to design a five-node ring network with a hub node and four remote nodes. Each remote node needs two wavelengths of traffic to/from the hub node on both sides of the ring; that is, you will need to dedicate two wavelengths to each remote node and terminate all the wavelengths at the hub node. You have to pick between
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