This research is devoted for reviewing a differe nt types of fiber optical amplifiers for construction the optical system of transmission such erbium-doped fiber amplifi er (EDFA), Thulium-doped fiber amplifier (TDFA), Compelle d Combinational Dispersion (CCD), their principles of wo,r k advantages, and disadvantages, with purpose of increasing eth pass band spectrum and to decrease some disadvantages su ch attenuation and dispersion. also considered a suggested metho d of simultaneous stokes and anti-stokes strengthening of compelled combinational dispersion in fibers