Abstract An electro-optical polymer optical fiber modulator based on D-shaped few-mode fiber is proposed and optimized. In the D-shaped few-mode fiber, the electro-optic polymer coated on the few-mode fiber influences the refractive index of LP01 mode and LP02 mode, while LP01 mode is more sensitive. According to that, the mode field distribution has been analyzed and the varying properties of D-shaped FMF covered with electro-optic polymer has been discussed. Its simple cascade and axial alignment design enhances the stability of all-fiber modulators. Using improved M-Z structure with advanced operating point, the electro-optic modulator achieves an insertion loss of less than 2 dB with a modulation depth of 22 dB at 1550 nm. And the length of modulator is 25.69 mm. Moreover, the Vpi is 2.7 V and the optical bandwidth is 6.9 nm, which make the modulator have low power consumption and can be used in next-generation all-optical communication networks.

中文翻译：

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基于改进MZ结构的D型少模光纤的超低损耗电光聚合物调制器

摘要 提出并优化了一种基于D形少模光纤的电光聚合物光纤调制器。在D形少模光纤中，涂覆在少模光纤上的电光聚合物影响LP01模和LP02模的折射率，而LP01模更敏感。据此，对模场分布进行了分析，并讨论了电光聚合物覆盖的D形FMF的变化特性。其简单的级联和轴向对准设计增强了全光纤调制器的稳定性。电光调制器采用改进的 MZ 结构，具有先进的工作点，在 1550 nm 处的调制深度为 22 dB，实现了小于 2 dB 的插入损耗。调制器长度为 25.69 mm。此外，Vpi 为 2.7 V，光学带宽为 6.9 nm，