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基于半导体量子点的特性,结合光纤渐逝波耦合器,提出了一种新型的光纤放大器件,它将以溶液形式的硫化铅(PbS)半导体量子点材料沉积于耦合器熔锥区,信号光和抽运光通过渐逝波共同与半导体量子点材料相互作用,实现光的放大作用。PbS量子点材料是采用工艺容易控制的反胶束法制备的,通过透射电镜(TEM)测量得到其粒子尺寸小于10 nm。利用工作波长为980 nm,功率为30 mW的半导体激光器抽运光源对该光纤放大器抽运,在1310 nm波段得到了大于4 dB的增益,这是半导体量子点尺寸效应引起的光谱蓝移现象的体现。因此,这种有源区短、器件结构紧凑的光纤放大器在高速、宽带光纤接入等领域具有重要的实际意义和应用价值。
Based on the properties of semiconductor quantum dots and a fiber evanescent wave coupler, a new type of optical fiber amplifier device is proposed. The PbS semiconductor quantum dot material in the form of solution is deposited on the taper area of the coupler. The signal light And pumped light through the evanescent wave together with the semiconductor quantum dot material interaction, to achieve the role of light amplification. PbS quantum dot materials are prepared by the reverse micelles method with easy control of the process and have a particle size of less than 10 nm as measured by transmission electron microscopy (TEM). The fiber amplifier is pumped at a working wavelength of 980 nm and a power of 30 mW by pumping a light source with a gain of more than 4 dB at 1310 nm, which is a blue-shift of the spectrum caused by the size effect of the semiconductor quantum dots reflect. Therefore, the optical fiber amplifier with short active area and compact device structure has important practical significance and application value in the fields of high-speed broadband optical fiber access and the like.