侧边抛磨光纤中传输光功率变化的实验研究

针对轮式光纤侧边抛磨法制备的侧边抛磨光纤,研究了在侧边抛磨区覆盖不同折射率的材料时,侧边抛磨光纤传输光功率随覆盖材料折射率变化的特性.研究表明,侧边抛磨光纤中传输光功率会随抛磨区覆盖材料折射率的变化而改变.当覆盖材料的折射率小于1.437 8时,光功率损耗近似为零；而当覆盖材料的折射率逐渐增大接近1.452 1时,光功率损耗迅速增大至最大值.当覆盖材料的折射率由1.453 2逐渐增大时,光功率损耗由最大值逐渐减小,最终维持在某个确定的值.侧边抛磨光纤并不是抛磨深度越深,损耗就越大.侧边抛磨光纤中传输的光功率存在波长相关损耗(WDL）.实验结果与理论结论符合较好.

Experimental Investigations of Transmitting Optical Power in Side-polished Fiber

The performance of optical power transmission through a side polished fiber manufactured by wheel polishing method is investigated,in which materials of different refractive indices were overlaid on the polished surface.The experiments show that the transmitted optical power through the side-polished fiber varied with the refractive index of the overlaid material.When the index of the overlaid materials is lower than 1.437 8, the loss of optical powers in the fiber core is nearly zero.When the index of the overlaid material approaches 1.452 1,the loss of optical power swiftly increased to a maximum.As the increase of the refractive index of the overlaid material continued, the loss of optical power decreased gradually until it reaches at an asymptotic value.It is not truth that the deeper the side-polished is,the higher the loss of optical power is.Optical power loss through side-polished fiber is also wavelength dependent.The result of our experiments fitted well the theoretical calculation.Side-polished fiber manufactured by wheel polishing method can not only be used to control optical power transmission through the fiber core but also be used as a refractive index sensor.