温度对光纤准直器的角度偏移影响分析

Analysis of Temperature Effect on the Angular Shift of Optic-fiber Collimator

通过对光纤准直器准直失配,即离轴耦合、偏角耦合、间距耦合三种情况的耦合损耗进行分析,发现角度偏移对耦合效率影响最大.实验中随着温度周期性的变化,光斑位置也出现了有一定规律性的变化.实验通过确定光斑位置的变化量从而求出鞍型和拱型支承架在温度循环时的角度偏移为519μrad和395μrad,并导致了0.944dB和0.718dB的耦合损耗;在温度冲击时的角度偏移为986μrad和138μrad,并导致了1.793dB和0.251dB的耦合损耗.实验结果表明拱型支承架在两种不同的温度变化情况下均优于鞍型支承架.

According to the analysis of collimating misalignment of optic-fiber collimator, that is the coupling efficiencies in abaxial, angular shift, distance coupling and angular shift have the most effect in coupling efficiency. Spot position varied regularly as long as the temperature varied periodically during the experiment. Figured out by the position shifts of light spot in experiments, the angular shifts of saddle and arch clips during temperature cycles were 519 μrad and 395μrad,and thus led to coupling lost of 0. 944 dB and 0. 718 dB; the angular shifts of saddle and arch clips during temperature shocks were 986μrad and 138 μrad,and thus led to coupling lost of 1. 793 dB and 0. 251 dB. The result of the experiments demonstrated that arch clip is better than saddle clip in both situations of temperature variation.