提出一种多芯光纤对角芯反射耦合器，可实现多芯光纤对称纤芯的光路低损耗串联。首先，采用纤端精密研磨的方法制备出45°圆台，得到平均插入损耗为2.14 dB的器件；其次，通过研磨制备出多角度圆台，并采用电弧平滑优化的方法实现了圆台的弧形优化，使得平均插入损耗降低至1.39 dB。对2种圆台型器件的制备容差进行了对比分析，结果表明，优化后的弧形圆台相较于优化前具有更好的制备容差和性能。

In this paper, a calibration method is proposed which eliminates the zeroth order effect in lateral shearing interferometry. An analytical expression of the calibration error function is deduced, and the relationship between the phase-restoration error and calibration error is established. The analytical results show that the phase-restoration error introduced by the calibration error is proportional to the phase shifting error and zeroth order effect. The calibration method is verified using simulations and experiments. The simulation results show that the phase-restoration error is approximately proportional to the phase shift error and zeroth order effect, when the phase shifting error is less than 2° and the zeroth order effect is less than 0.2. The experimental result shows that compared with the conventional method with 9-frame interferograms, the calibration method with 5-frame interferograms achieves nearly the same restoration accuracy.