Bulk high - speed traveling wave e - o modulator was also fabricated , the half - wave voltage is just 760 v , response time of the device is low up to 297 ps 此外,用本實(shí)驗(yàn)的ktp晶體制作了體式高速行波電光調(diào)制器,半波電壓760v ,脈沖響應(yīng)時(shí)間快到297ps 。
Finite element method ( fem ) is a method that is efficient in electromagnetics . for the first time the thesis applied vectorial fem to single mode performance and half - wave voltage analysis and design 有限元法被廣泛應(yīng)用于電磁場(chǎng)的研究中。本論文首次采用了矢量有限元方法來研究質(zhì)子交換鈮酸鋰光波導(dǎo)的單模特性和半波電壓。
In order to realize low half - wave voltage , high polarzation extinction ratio , low pigtailing polarization crosstalk , low insert loss , precise tapped power ( ratio ) and good splitting beam ratio , the optimum design was performed 為了實(shí)現(xiàn)低的半波電壓、高的偏振消光比、低尾纖串音、低插入損耗、精確的抽頭功率比和良好的分束比,我們對(duì)器件結(jié)構(gòu)進(jìn)行了優(yōu)化設(shè)計(jì)。
Because of the limitation of the measuring condition , in the thesis we had only measured some characteristics of the phase modulator : channel waveguides " loss coefficient is 0 . 22db / cm , the split - ratio is 52 / 48 and half - wave voltage is < 5v 由于條件所限,論文中僅測(cè)量了直波導(dǎo)損耗系數(shù)、相位調(diào)制器的半波電壓和輸出分束比。經(jīng)測(cè)量,半波電壓小于5v ,直波導(dǎo)損耗系數(shù)為0 . 22db cm ,輸出分支比為52 48 。