Moire Apodization of Fiber Bragg Grating

光纤布拉格光栅的云纹变迹

• 批准号: 18560338
• 负责人: EJIMA Seiki
• 金额: $ 1.45万
• 依托单位: Kagawa University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560338/
• 关键词: Fiber grating; Optical fiber; Fiber Bragg grating; Apodization; Optical filter; UV laser; Induced refractive index; 水素ローディグ; モアレ干渉; エキシマレーザー

Because fiber Bragg gratings (FBGs) have very sharp, narrow-band reflection spectra, they are well suited to applications involving narrow-band optical signals, such as optical filters in optical telecommunication systems, fiber laser cavities, and various types of fiber sensors. There, the effective apodization techniques are ever strongly desired for spectrum shaping such as suppressing side-lobes.We have developed novel technique of the apodization using two-beam interference method that controls the angle of mirror reflection by very small amount in step-wise or continuously during the time of the FBG formation by UV laser irradiation, which consequently forms superposition of FBGs of slightly different grating period and hence achieves the apodization. Experiments by two-step control of the minor angle have demonstrated very clear spectrum shaping in suppressing side-lobes. Thus the new technique appears to provide very powerful apodization technique for the FBG fabrication.We have published the result to Japanese Journal of Applied Physics about our novel technique on two-beam interference method of FBG fabrication, to oral presentation to the conference of Japanese Applied Physics Society, and Japanese Journal of Optics about the new technique of apodization.

由于光纤布拉格光栅 (FBG) 具有非常尖锐的窄带反射光谱，因此非常适合涉及窄带光信号的应用，例如光通信系统中的光学滤波器、光纤激光腔和各种类型的光纤传感器。在那里，强烈需要有效的变迹技术来进行频谱整形，例如抑制旁瓣。我们开发了使用两光束干涉方法的变迹新技术，该技术可以逐步或逐步地以非常小的量控制镜面反射角度。在紫外激光照射形成FBG的过程中，连续不断地形成光栅周期略有不同的FBG的叠加，从而实现变迹。通过对小角度进行两步控制的实验表明，在抑制旁瓣方面具有非常清晰的频谱整形效果。因此，新技术似乎为 FBG 制造提供了非常强大的变迹技术。我们已将有关 FBG 制造的两光束干涉方法的新技术的结果发表在《日本应用物理学杂志》上，并在日本应用物理会议上进行口头报告物理学会和日本光学杂志关于变迹新技术。

项目成果

Fabrication of superimposed fiber Bragg grating by two-beam interference method

双光束干涉法制作叠加光纤布拉格光栅

• 发表时间: 2008
• 期刊: Journal of the Society of Material Science, Japan Vol.57 No.2
• 作者: Keisuke;NAKAYAMA;Ryuji;IKEBE;Kenji;SAICAMOTO;Jun-pei;MOHRI;Hiroki;MIZOBUCHI;Makoto;YAMAUCHI;Eiji;IZUMIICAWA;Yasuo;MIZUTANI;Takashi;YOKOUCHI;Hiromu IWATA;Yoshifumi;SUZAKI;Seiki;EJIMA
• 通讯作者: EJIMA