1- Two 1-km fibers are spliced together. Each fiber has a 3-dB loss, and the splice adds 2 dB of loss. If the power entering is 2 mW, then how much power is delivered to the end of this combined transmission line?

2- Compare the fiber used in trans-Atlantic communication systems with the one used in micro-bend sensors in terms of material, attenuation, light modes, core size, and cost.

3- When an LED has 2 V applied to its terminals, it draws 100 mA and produces 2 mW of optical power. What is the LED's conversion efficiency from electrical to optical power?

4- Consider a plastic fiber having a loss of 50dB/km. The power budget for the system allows a max 24 dB of fiber loss. Compute the maximum length of fiber permitted

5- Compute the frequencies at the edges of the visible spectrum. Also compute the bandwidth of the visible spectrum (that is, the difference between the highest and lowest visible frequencies).

6- Why do system designers choose 1550nm as the wave length of operation for transoceanic optical fiber telecommunications and 1300 nm as the wavelength of operation when designing LAN fiber optic systems? i.e. what is the main advantage of operating at each of those wavelengths?

7- Two people are talking over a glass-fiber transmission line. It takes 10s for a message to travel between the speakers. How long is the fiber?