Low excess loss conditions of polarization-maintaining fiber couplers.
Low excess loss conditions of polarization-maintaining fiber couplers.
复制标题
保偏光纤耦合器的低过量损耗条件。
作者：
I. Yokohama;K. Chida;J. Noda
测量了熔融保偏光纤耦合器的损耗特性和场强分布。结果表明，过量损耗谱具有正弦响应。此外，具有折射率降低应力施加部件的普通保偏减吸收(PANDA)光纤耦合器的损耗峰值比具有折射率匹配应力施加部件的PANDA耦合器的损耗峰值大。还证实，即使在传统的 PANDA 光纤耦合器中，对于大的熔融区域腰部直径也可以获得 <0.1 dB 的低额外损耗。
Loss characteristics and field intensity distributions of fused polarization-maintaining fiber couplers are measured. From the results, it is shown that excess loss spectra have a sinusoidal response. Further, the loss peaks of the usual polarization-maintaining and absorption-reducing (PANDA) fiber couplers with indexdepressed stress applying parts are larger than those of PANDA couplers with index-matched stress applying parts. It is also confirmed that low excess loss of <0.1 dB can be obtained for a large waist diameter of the fused region even in conventional PANDA fiber couplers.