KrF准分子激光诱导光纤光栅生长特性的研究

GROWTH PROPERTY OF FIBER BRAGG GRATINGS INDUCED BY KrF EXCIMER LASER

光纤光栅是未来高速、超高速光纤通信系统中不可缺少的关键器件。本文报道了以２４８ｎｍ的ＫｒＦ准分子激光为光源，用相位掩模技术在Ｂ／Ｇｅ双掺光纤上研制出反射率９８．８％，反射谱３ｄＢ带宽０．４ｎｍ，反射谱边瓣抑制达２０ｄＢ以下，具有优良滤波特性光纤光栅的实验研究结果。在此基础上。

Fiber Bragg gratings are key elements for future ultrahigh speed optical fiber communication systems. In this paper, we report the exprimental results that fiber grating with 98.8% peak reflectivity is fabricated in B/Ge co doped fiber by 248 nm KrF excimer laser irradiated a phase mask. The 3 dB bendwidth of the grating reflective spectra is 0.4 nm and the sidelobe is suppressed to less than 20 dB. This is the best result in China according to our knowledge. Based on the exprimental results, the growth property of fiber Bragg gratings in B/Ge co doped fiber irradiated by 248 nm KrF excimer laser through a phase mask is investigated, and the microscopic mechanism of photosensitivity in optical fiber is analyzed.