Y型光波导分束比和插入损耗测量技术研究

Y波导在集成光学系统中得到了广泛的应用，并拥有很大的潜力，近年来备受关注。因此了解它的各项指标至关重要。在Y波导的诸多指标中，分束比和插入损耗是2个重要指标。着重介绍了2个指标的测量装置及测量方法。对于分束比，分别采用波长为1300nm和1550nm的激光光源测量Y波导两尾纤的输出光功率。根据公式计算出分束比后，分析影响测量结果的主要因素，进行测量不确定度评定。对于插入损耗，主要是按照测量原理搭建测量装置，从理论上分析影响插入损耗测量的因素。通过对Y波导2个指标的测量，有助于更好地了解Y波导的性能。

Measurement of beam-splitting ratio and insertion loss of Y-waveguide

Y-waveguide is widely used in the integrated optics, and it is important to know its specifications, among which the beam-splitting ratio and insertion loss are the most critical parameters. The measurement setups and methods for the two parameters are introduced. As for the beam-splitting ratio, the output luminous power for two tail fibers of Y-waveguide was measured respectively by using two sources with wavelengths at 1300nm and 1550, and the primary factors which affected the measurement were analyzed and the uncertainty was evaluated after working out the beam-splitting ratio according to the formula. As for the insertion loss, the measurement setup was built up based on the measurement principle, and the factors which affected the measurement of the insertion loss were theoretically analyzed.