Long-band erbium doped fiber amplifier

摘要

The present invention discloses a long-band Erbium doped fiber amplifier (30) including: a first Erbium doped fiber (316) with a predetermined length, coupled to a first pumping light source (318) through a first wavelength selective coupler (314), for amplifying a C-band optical signal by supplied pumping light; a second Erbium doped fiber (330) with a predetermined length for amplifying an L-band optical signal by a second pumping light source (340); a feedback loop for recycling a specific C-band wavelength generated in the amplification of the first Erbium doped fiber as the second pumping light source of the L-band optical signal; a tap coupler (320) formed between the first and second Erbium doped fibers, for dividing the optical power amplified in the first Erbium doped fiber, for supplying a predetermined ratio of optical power to the second Erbium doped fiber, and for re-inputting the residual optical power to the feedback loop; and, a second wavelength selective coupler (328) for coupling the signal light transmitted from the tap coupler to the first Erbium doped fiber. <IMAGE>