With the existing condition, the bar waveguide on the lithium niobate wafer with liquid phase proton-exchanged method has been fabricated and the benzoic acid is used as the proton source . a series of research on the domain inversion in lithium niobate crystal with proton-exchanged method have been done . and then the operation and the process of domain inversion in lithium niobate crystal with proton-exchanged method has been used 實驗方面,利用實驗室現有條件,在鈮酸鋰晶片上以苯甲酸為質子源,用液相質子交換法制作了條形波導;對用質子交換法實現鈮酸鋰晶體疇反轉進行了一系列實驗研究,在此基礎上提出了質子交換法實現鈮酸鋰晶體疇反轉的工藝過程,實現了疇反轉并腐蝕得到了v型槽;設計制作了帶尾纖的電光相位調制器,最后進行封裝。