Question1: Optical fiber losses (20pt) You are designing an optical link for STC and the transmit power is 0.1mW while the receiver sensitivity is -46dBm. The optical fiber cable loss is

2.5dB/km and desired data rate is 40Gbps. We are interested in finding how many repeaters to add and after how many km to maintain BER of 10-10. a) Express the receiver sensitivity in units of W. What is the voltage swing of this signal in units of Vpp? (assume 50 environment) (10pt) b) What is the maximum optical fiber length to make sure the received power never falls below the desired sensitivity? (5pt) c) Assuming a desired constellation of 64QAM, what is BW that this link should support? (5pt)