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1. 发明授权

US06836418B2 Slant short-period grating 失效
标题翻译：斜长时间光栅
公开(公告)号：US06836418B2
公开(公告)日：2004-12-28
申请号：US10311641
申请日：2002-12-17
申请人： Akira Sakamoto , Masaaki Sudo , Reiko Kojima , Tomosada Inada , Satoshi Okude , Kenji Nishide
发明人： Akira Sakamoto , Masaaki Sudo , Reiko Kojima , Tomosada Inada , Satoshi Okude , Kenji Nishide
IPC分类号： G02B634
CPC分类号： G02B6/02119
摘要： There is provided a slant short-period grating which is obtainable by irradiating light onto an optical fiber whose core is formed from quartz glass to which has been doped a photosensitive dopant that changes a refractive index of the quartz glass by light irradiation, and whose clad has one or two or more layers with at least the layer that is adjacent to the core being a photosensitive layer formed from quartz glass to which has been doped a photosensitive dopant that changes a refractive index of the quartz glass by light irradiation. In this slant short-period grating a grating portion is formed by changing the refractive index of the photosensitive layer of the clad and the core at a predetermined grating period along a longitudinal direction of the optical fiber by a predetermined slant angle. The diameter of the core is set to 5 &mgr;m or more, and the relative photosensitivity ratio of the core relative to the photosensitive layer of the clad that is adjacent to the core is designed so as to satisfy a predetermined formula. As a result, in the wavelength spectrum of transmitted light, loss peaks are obtained in a narrow frequency band.
摘要翻译：提供了一种倾斜的短周期光栅，其可以通过将光照射到其由已经掺杂有通过光照射改变石英玻璃的折射率的光敏掺杂剂的石英玻璃形成的光纤上而获得，并且其包层具有一层或两层以上至少具有与芯相邻的层的层是由石英玻璃形成的感光层，已经掺杂有通过光照射改变石英玻璃的折射率的光敏掺杂剂。在这种倾斜的短周期光栅中，光栅部分是通过以预定的倾斜角度沿光纤长度方向改变预定光栅周期的包层和芯的感光层的折射率来形成的。将芯的直径设定为5μm以上，并且将芯相对于与芯相邻的包层的感光层的相对光敏度比设计为满足预定公式。结果，在透射光的波长光谱中，在窄频带中获得损失峰值。

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