(b) (i) A long single mode optical fiber has an attenuation of 0.40 dBkm when operating at a wavelength of 1.55 m. The fiber core diameter is 6 pm and the laser source bandwidth is 500 MHz. Determine the threshold optical power for stimulated Raman scattering. (ii) List the characteristic of the optical attenuators. Evaluate the output power at Tap port in the coupler shown in Figure Q2(b). Splitting ration of each coupler = 9:1. Input power =1mW Connector loss = 0.2 dB Excess loss 0.3 dB Throughout power Tap power Workstation 1 Figure Q2(b) [6] [4] [10]