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研究了交联型聚氨酯材料集成衰减全反射型双通道聚合物波导电光调制器的制备和性能。这种电光调制器的制备技术非常简单,只要用两个分立的下电极代替单通道调制器中的下电极即可。通过测量器件的调制特性,在832 nm波长下,获得了最大电光系数为24.2 Pm/V,调制带宽约为500 MHz、插入损耗低于1.5 dB。由于器件上下电极的垂直距离为微米级、而通道之间的水平距离为毫米量级的设计,使各通道之间的场不会引起相互交迭,因而未测到各通道间的串扰。另外,热交联型聚合物材料的采用提高了整个器件的热稳定性,在100℃经过800 h后,电光系数仍然保持初值的88%。
The preparation and performance of a cross-linked polyurethane integrated attenuated all-reflective dual-channel polymer waveguide electro-optic modulator were studied. The electro-optic modulator is very simple to make, as long as the two separate lower electrodes replace the lower electrode in the single-channel modulator. By measuring the modulation characteristics of the device, a maximum electro-optic coefficient of 24.2 Pm / V was obtained at a wavelength of 832 nm, a modulation bandwidth of about 500 MHz and an insertion loss of less than 1.5 dB. Because the vertical distance between the upper and lower electrodes of the device is on the order of microns and the horizontal distance between the channels is on the order of millimeters, the fields between the channels do not overlap each other and thus crosstalk between the channels is not detected. In addition, the thermal cross-linked polymer material used to improve the overall thermal stability of the device, after 800 h at 100 ℃, the electro-optical coefficient still maintain the initial value of 88%.