熔融拉锥光纤耦合器波长响应研究

Research on wavelength response of fused-tapered optical fiber coupler

基于变分理论,分析了常规对称单模熔融拉锥光纤耦合器的腰部区域和梯度区域的耦合行为,得出了耦合器耦合比与波长的关系,并在熔融拉锥机的实验平台上进行了相应的波长响应实验,理论和实验结果都表明:在一定波长范围内,耦合比不但对波长敏感,且响应具有单调性。利用此特性,光纤耦合器有望作为光波长敏感元件,开发出结构简单、造价低廉的光波长探测器。

Based on varational calculus theory, the coupling behaviors of the waist zone and the trapezoidal zone of the common symmetrical fused-tapered optical fiber coupler have been analysed, and the correlation between coupling ratio and wavelength has been gotten, and the response experiment has been done on a fused biconical taper machine. The result indicates that in a certain range of wavelength, not only the coupling ratio is sensitive to wavelength,but also the function is monotonic. Using this characteristic, the optical fiber coupler may be used as a sensitive element of optical wavelength, which helps to develop a kind of optical wavelength detector, whose structure is simple and cost is low.