This Question from " Optical Fiber Communication Systems with MATLAB® and Simulink® Models" "

12.7 An undersea optical transmission is to be designed. The undersea distance is 220 km. The bit rate is 40 Gb/s, and optical receiver with a sensitivity of −20 dBm is available. Optical amplifiers EDFA and ROA are considered with the following parameters: fiber types, SSMF and DCF (−85 ps/nm/km and effective area of 17 μm2); EDFA: Gain 20 dB, NF = 5 dB output power, saturated output power = 15 dBm for booster amplifier type and +10 dBm for optical preamplification type. Raman optical amplifiers: pump power of 500 mW, gain in SSMF is 12 dB over 20 km distributed distance of the fiber and NF = 3 dB, for both co- and contradirectional pump:

(a) Sketch a proposed structure of the transmission link.

(b) Obtain a diagram of the signal power or power budget over the link.

(c) Obtain the dispersion budget over the link.