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实现了一种硒化铅(Pb Se)量子点掺杂的光纤放大器(QDFA)。以直径为4 cm的Pb Se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50μm的多模量子点掺杂光纤,激励阈值为62 m W,-3 d B宽带达120 nm,-1 d B平坦带宽为90 nm,增益可达12 d B。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 QDFA quantum dot doped optical fiber amplifier (QDFA) is realized. A 4 cm-diameter PbSe quantum dot is used as a fiber gain medium, and a full-optical transmission structure is formed by a quantum dot doped optical fiber, a 980 nm single mode laser, a wavelength division multiplexer, an isolator and the like, Interval to achieve the signal light amplification. The experimental results show that the excitation threshold is 62 mW for a multimode quantum dot doped fiber with a core diameter of 50μm, the width of -3 d B is up to 120 nm, the flat bandwidth of -1 d B is 90 nm and the gain is up to 12 d B. Compared with the traditional erbium-doped fiber amplifier, QDFA wider bandwidth, gain more flat, low noise. The QDFA provides a new way to address the growing bandwidth requirements of fiber-optic communication amplifiers for today’s intensive optical wavelength division multiplexing (DWDM) systems.