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      Exercise 1: Explain the following terms:

      1. Optical-to-Electrical-to-Optical (OEO) conversions.
      2. Gain Bandwidth.
      3. Raman Scattering.
      4. Pump Wavelength.
      5. Booster, in-line and preamplifier.

       Exercise 2: Explain the basic of operating principles, with schematics,behind:

      1. Semiconductor Optical Amplifier (SOA);
      2. Raman Amplifiers (RA);
      3. Erbium Doped Fiber Amplifier (EDFA)


      Exercise 3: Compare the strength and drawbacks between the above amplifiers.