高效微带线聚合物电光调制器的研制

High-efficient microstrip line polymer electro-optic modulators

设计、制作并测试了1.55μm光波长的微带线行波电极电光调制器。如果聚合物材料的电光系数γ33=30 pm/V,中心电极L为20 mm,设计的调制器性能参数半波电压为6.70 V。用自主合成的发色团分子组成二阶非线性光学聚合物材料做为芯层制作的聚合物调制器,对调制器的各项性能参数进行了直流、低频和微波性能的测试,采用不同极化方法,在1.55μm波长上测得低频半波电压分别为10.5V(电晕极化)和4.9V(接触极化),折算得芯层材料的电光系数分别为21pm/V和45pm/V。测得消光比为24dB。用矢量网络分析仪测试电极系统的微波性能,S参数反映了此电极系统具有低的微波传输损耗和反射损耗。

Polymeric electro-optic modulators with microstrip line traveling-wave electrode was designed, fabricated and tested. Assuming that the electro-optic coefficient γ33 of the core polymer is 30 pm/V, the performance parameters of the designed modulator is half-wave voltage Vπ=6.70 V. The modulator was fabricated using the second-order nonlinear optical polymer materials which contained the independently synthesized chromophores. The performance of the modulators in direct current （DC）, low frequency and microwave property were tested. Using the different poling methods, the low frequency Vπ values at 1.55μm were 10.5 V and 4.9 V for corona poling and contact poling, respectively. The electro-optic coefficient of core layer material γ33 was thus obtained as 21 pm/V and 45 pm/V. The extinction ratio was measured to be 24 dB. Microwave property of electrode system was also tested with a vector network analyzer, and S parameters reflected this electrode system with low microwave transmission loss and return loss.