Fluorinated polymaleimides with high thermal stability and low optical absorption loss in the optical communication wavelength of $1.55\mu}m$ were investigated for application in low-loss waveguide materials. The fluorinated polymaleimides were prepared from two monomers phenylmaleimide (H-PMI) and pentafluorophenylmaleimide (F-PMI). All synthesized copolymers had high thermal stability (decomposition temperature $(T_d)=380-430^\circ}C$). The refractive index of the copolymers could be tuned from 1.4969 to 1.5950 in the TE mode and from 1.4993 to 1.5932 for the TM mode at 632.8 nm by copolymerizing different weight ratios of H-PMI and F-PMI. The refractive index of the copolymers decreased with increasing F-PMI content. In addition, when the amount of F-PMI was increased, optical loss and absorption loss at 632.8 nm and 1550 nm, respectively, decreased.
研究了在光通信波长
$1.55\mu}m$内具有高热稳定性和低光吸收损耗的
氟化聚马来
酰亚胺在低损耗波导材料中的应用。
氟化聚马来
酰亚胺由苯基马来
酰亚胺(H-PMI)和
五氟苯基马来
酰亚胺(F-PMI)两种单体制备。所有合成的共聚物均具有较高的热稳定性(分解温度
$(T_d)=380-430^\circ}C$)。通过共聚不同重量比的H-PMI和F-PMI,共聚物的折射率在632.8 nm处可以在TE模式下从1.4969调整到1.5950,在TM模式下从1.4993调整到1.5932。共聚物的折射率随着F-PMI含量的增加而降低。此外,当F-PMI的量增加时,632.8 nm和1550 nm处的光损耗和吸收损耗分别降低。