Dispersion-compensated raman optical fiber amplifier

A dispersion-compensating, Raman optical fiber amplifier used in an optical communications system comprising:

• a circulator having a fist end, a second end, and a third end for forwarding input optical signals received therein through the first end to the second end and for forwarding reflected optical signals received therein through the second end to the third end;
• an erbium-doped fiber coupled to the second end output of the circulator for amplifying optical signal passing therethrough;
• a first pumping light source for outputting a pumping light having a designated wavelength to the erbium-doped fiber;
• a first wavelength selective coupler for coupling the pumping light output from the first pumping light source to the erbium-doped fiber;
• a dispersion-compensating fiber for compensating amplified optical signal output from the erbium-doped fiber and dispersion of the reflected optical signals passing therethrough;
• a second pumping light source for outputting a pumping light having a designated wavelength to the dispersion-compensating fiber;
• a second wavelength selective coupler for coupling a pumping light output from the second pumping light source to the dispersion compensating fiber;
• and,
• a reflector coupled to the output of the dispersion-compensating fiber for reflecting optical signal output back into the dispersion-compensating fiber.