提出一种耦合参量可用光调控的掺铒光纤非线性耦合器．用熔融拉锥法熔合两根掺铒光纤，拉制成工作波长为1550 nm的3 dB掺铒光纤耦合器．通过调变输入耦合器一臂的980 nm泵浦光功率，可以改变两臂的传播常量差，从而改变耦合器两臂信号光的相对输出功率．通过测量输入泵浦光功率和两臂信号光输出功率，得到直通臂耦合比依赖于泵浦光功率的实验曲线．实验研究表明，当泵浦光功率从0 mW变化至20 mW时，耦合比的变化可达到40%．与理论模拟的结果一致．

An erbium-doped fiber nonlinear coupler(EDFNC),in which the coupling parameters could be controlled by the light were firstly proposed. By using the fusing-elongation machine to fusing together two Er³⁺-doped fibers,a 3 dB nonlinear coupler was fabricated for the signal light at 1550 nm. When changing the pump light at 980nm launched into one arm of the coupler,the propagation-constant difference between two arms of the coupler would be changed,and then the relative output powers of signal light from two arms would also be changed. Measuring the input pump power and two output signal powers of EDFNC,it obtained the experimental curve of the bar coupling ratio versus the pump power.The experiments showed that when increasing pump power from 0 mW to 20 mW,the variation of coupling ratios could reach to 40%. The theory simulation and the experiment results were well consistent.