实现了一种硒化铅(PbSe)量子点掺杂的光纤放大器(QDFA)。以直径为4 nm 的PbSe 量子点作为光纤增益介质，由量子点掺杂光纤、980 nm 单模激光器、波分复用器、隔离器等组成全光传输结构，在1250~1370 nm 的宽带区间实现了信号光的放大。实验表明：对于纤芯直径为50 μm 的多模量子点掺杂光纤，激励阈值为62 mW，-3 dB 宽带达120 nm，-1 dB 平坦带宽为90 nm，增益可达12 dB。与传统的掺铒光纤放大器相比，QDFA 的带宽更宽，增益更平坦，噪声也较低。该QDFA 为解决目前密集型光波复用(DWDM)系统对光纤通信放大器日益增长的带宽需求提供了一种新的途径。

A PbSe quantum-dot-doped fiber amplifier (QDFA) is realized. Using PbSe quantum dots as the gain media doped in the fiber, the broadband signal light ranging from 1250 nm to 1370 nm is amplified in an all-optical framework，which consists of the quantum- dot- doped fiber, 980 nm pumping laser, wavelength division multiplexing, and isolator. For the diameter of 50 mm quantum-dot-doped fiber, there is evidence to show that the excitation threshold is 62 mW, the bandwidth is 120 nm at -3 dB, the flattened bandwidth is 90 nm at -1 dB, and the signal gain is up to 12 dB. The wide bandwidth, flattened gain, and low noise of QDFA are advantageous over the traditional erbium doped fiber amplifiers. The QDFA presented in this paper provides a new solving way of the growing demand for the bandwidth of fiber amplifiers in the current dense wavelength division multiplexing(DWDM) system.