光锥导光装置耦合效率分析与测试

介绍了光锥导光装置的优势，分析了影响光锥导光装置耦合效率的主要因素，得出了影响光锥导光装置耦合效率的理论模型误差曲线。以光锥端面反射损耗及光纤辐射损耗为主要误差源，测试了光锥导光装置的耦合效率及误差对耦合效率的影响；采用分光比标定的方法测量导光装置的耦合效率，消除了由于激光器输出能量变化给试验中脉冲能量测量环节带来的影响；根据试验测量数据，拟合出误差对耦合效率的影响曲线，通过与理论误差曲线进行对比，验证了理论模型的正确性，同时测得该耦合装置的耦合效率为70．26％。在激光束的入射角度误差〈5°，且在光纤耐受弯折允许范围内甩动光纤的情况下，总误差对耦合效率的影响〈10％，满足实际工程误差的允许范围。该耦合装置已经应用到实际工程中。

Analysis and test of coupling efficiency of optical vertebra transmitting device

The superiority of an optical vertebra transmitting device is introduced. The main factors that im- pact the coupling efficiency of the optical vertebra transmitting device are analyzed, and the theoretical model error curves which impact the coupling efficiency of the optical vertebra transmitting device are gained. By tak- ing the reflection loss of an optical vertebra end face and the fiber radiation loss as the main error sources, the coupling efficiency of optical vertebra transmitting device and the impact of errors on the coupling efficiency are tested, and a calibration method using the split ratio to measure the coupling efficiency of the transmitting device is proposed ; furthermore, the impact of the changing of laser output on pulse energy measuring is elimi- nated. Based on the testing data, the impact curve of error on the coupling efficiency is fited, then the accura- cy of the theoretical model is verified by comparison with the theoretical error curve, meanwhile the coupling efficiency of the coupling device is measured to be 70. 26%. Under the condition that the laser beam incident angle error is less than 5° and the fiber is swung under the tolerance in the fiber bending extent, the effect of total error on the coupling efficiency is less than 10%, which meets the allowable error of the actual project. The coupling device has been applied to practical engineering ,