1. Discuss the factor(s), which will determine the bandwidth-length product of a step index multimode optical fiber. Hence, discuss why the gain bandwidth-length of a single mode fiber is much greater than a multimode step index fiber. An optical fiber of length 50km has a transmission loss 0.2dB/km at 1.55um wavelength. If a light source of 0dBm is launched into the fiber though a connector. Calculate the power in dBm received at the output of the fiber. You may assume the connector loss is 1dB. (7 marks) 1. Discuss the factor(s), which will determine the bandwidth-length product of a step index multimode optical fiber. Hence, discuss why the gain bandwidth-length of a single mode fiber is much greater than a multimode step index fiber. An optical fiber of length 50km has a transmission loss 0.2dB/km at 1.55um wavelength. If a light source of 0dBm is launched into the fiber though a connector. Calculate the power in dBm received at the output of the fiber. You may assume the connector loss is 1dB. (7 marks)