Optical Fiber Communications 4th Edition by Gerd Keiser

Exercise 1

Consider the four-node network shown in Fig.13.58. Each node uses a different combination of three wavelengths to communicate with the other nodes, so that there are six different wavelengths in the network. Given that node 1 uses 2 , 4 , and 6 for information exchange with the other nodes (i.e., these wavelengths are added and dropped at node 1, and the remaining wavelengthsw from other nodes pass through), establish wavelength assignments for the other nodes.
Fig. 13.58