Consider a full-duplex network shown in Fig. 9.2. Ideal 3-dB couplers and ideal connectors and fibers are used. (a) Compute the total loss in dB from transmitter to receiver. (b) in part (a), if the directional couplers each have 1,5 dB of excess loss and all connectors have 0,8 dB of loss. The fiber has a 4-dB loss. Compute the total loss in dB from transmitter to receiver.