基于侧边抛磨光纤的全光纤在线光功率监测器

All fiber online optical power monitor based on side-polished fiber

应用侧边抛磨光纤的倏逝波原理,用光电探测器对光纤侧边抛磨区出射光能进行监测,根据理论和实验分析光纤侧边抛磨区出射光能分布,将具有特殊U型侧边抛磨形状和适当抛磨深度的侧边抛磨光纤与光电探测器精密微封装,制成基于侧边抛磨光纤的全光纤在线光功率监测器。测试表明:此全光纤在线光功率监测器对光纤传输的光功率响应特性好,监测器光电转换效率可达200 mA/W以上。测试了器件的插入损耗、波长相关损耗、波长相关光电转换效率和偏振相关损耗等。其波长相关损耗和偏振相关损耗分别为0.3 dB(1 520 nm～1 620 nm)和0.07 dB(1 310nm)。此器件具有对光纤纤芯无破坏、光路中无插入元件、可与光纤系统直接熔接等诸多优点。

According to the principle of evanescent wave and the distribution of optical light from the side polished area of side polished fiber,an all fiber online optical power monitor was made by packaging a chip of optoelectronic detector on the side-polished fiber with U shape and suitable depth to detect the leaked light.Using the wheel side-polished fiber machine,side-polished fibers with the special shape and depth of polished area for monitoring optical power in the fiber was manufactured.The measured results show that the optical power monitor features good optical responsivity and its maximum opto-electric transition efficiency reaches 200 mA/W.Its wavelength dependent loss is 0.3 dB（1 520 nm～1 620 nm）,polarization dependent loss is 0.07 dB.The all fiber optical power monitor has no invasion to the fiber core,no insertion elements and is easy to be connected with the optical system directly.