通过对光纤耦合条件的理论分析,设计了扩束型光纤连接器的光学系统,并在ZEMAX软件的混合模式下实现仿真。定量分析准直镜和聚焦镜产生的对准误差所引起的光束质量和耦合效率的变化。模拟结果表明,准直镜和聚焦镜存在偏心或倾斜误差且在允许范围内,可调整两透镜的位置补偿像差和光轴偏移以确保光束质量和耦合效率达标,并对模拟结果进行实验验证。再模拟光纤连接器在不同直径时的对准误差允许范围,并推导对准误差补偿公式。在扩束型光纤连接器的设计和装调过程中,计算对准误差补偿公式,由于准直镜失调产生的对准误差可通过聚焦镜进行补偿,既增加设计精度又简化装调过程。最后根据对准误差分析结果,自行设计并制造12 kW@600 μm的扩束型光纤连接器。

Through a theoretical analysis of fiber coupling conditions, an optical system of an beam-expanded optical fiber connector is designed and simulated in the hybrid mode of ZEMAX software. Quantitative analysis of the changes in beam quality and coupling efficiency caused by alignment errors of the collimator lens and focusing lens are performed. Simulation results show that the collimator lens and the focusing lens have eccentricity or tilt errors that are within the allowable range. The positions of the two lenses can be adjusted to compensate for aberrations and optical axis shifts to ensure that the beam quality and coupling efficiency meet standards. The simulation results are experimentally verified. Then, the allowable range of the alignment error of the optical fiber connector at different diameters is simulated and an alignment error compensation formula is derived. During the design and adjustment of the beam-expanded fiber optic connector, and derive the alignment error compensation formula. The alignment error causes by the misalignment of the collimator lens can be compensated by the focusing lens, which increases the design accuracy and simplifies the adjustment process. Finally, according to the results of the alignment error analysis, we design and manufacture a 12 kW@600 μm beam-expanded optical fiber connector.