熔锥型光纤反射器特性研究

分析并验证了光纤反射器的透过率在［0，1］范围内与耦合器耦合比偏离50∶50的程度呈二次曲线关系.环形腔中光纤的弯曲对透过率的影响不大，然而径向挤压和扭转通过双折射对透过率的影响比较明显，环境温度则通过耦合比来影响透过率.宽带3dB耦合器构成的反射器，对宽带光波几乎具备“全反射”功能.透过光形成的初期会出现一个脉冲，脉冲的上升沿时间和下降沿时间随入射光强的增加而缩短，脉宽与稳态输出光强则随入射光强的增加而增大.

Properties of the fused silicon fiber-reflector

Within the range from 0 to 1，the transmissivity of fused tapered fiber reflector as a conic function of the departure of the coupling-ratio from 50∶50 was examined theoretically and experimentally. Bending the fiber in loop-cavity causes no obvious change. However，twist and the radial pressure change the transmissivity，obviously，producing birefringence in the fiber core. Temperature changes the transmissivity through the induced departure of the coupling-ratio. Constructed with a broad-band 3dB fused tapered fiber coupler，the reflector shows total reflection. A pulse was observed at the beginning of the formation of the transmitted beam. Increasing the input intensity causes，the rise-time and the fall-time of the pulse to decrease, while the width of the pulse and the steady state value of the transmitted power to increase.