In this paper, size-tunable PbS semiconductor quantum dots were synthesized by sol-gel route and a novel optical fiber
amplifier was proposed. Based on fused tapered fiber coupler, the PbS quantum dots film was deposited in the couple
region and evanescent wave coupled semiconductor quantum dots fiber amplifier was fabricated. Due to the thinned
fiber shape, evanescent wave penetrates into outer surface. When the pumped light are propagated in the evanescent field
area, the evanescent wave of pumped light is absorbed by PbS quantum dots, so the PbS quantum dots are excited from
ground state to excited state. And when the signal light are propagated in the evanescent field area, the evanescent wave
of signal light stimulate PbS quantum dots, the quantum dots return to ground state and release photons which have the
same frequency and phase with signal light. With interaction between the evanescent wave power and the coated PbS
quantum dots film, the light can be amplified. The optical amplification was obtained at 1310nm wavelength with 980nm
wavelength LD as pump.
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