首页> 外国专利> Optical fiber gratings with azimuthal refractive index perturbation and devices for tuning, attenuating, switching, and modulating optical signals

Optical fiber gratings with azimuthal refractive index perturbation and devices for tuning, attenuating, switching, and modulating optical signals

机译:具有方位角折射率微扰的光纤光栅以及用于调谐,衰减,切换和调制光信号的设备

摘要

The present invention relates to a type of optical fiber grating having an azimuthal refractive-index perturbation. The optical fiber includes a fiber grating that has a plurality of grating elements formed therein. At least one of the grating elements has a spatially varying index of refraction that varies azimuthally about the centerline of the optical fiber. The fiber grating acts as a band-stop optical spectral filter. In addition, since fiber-cladding modes are weakly-guided modes, their power can be easily dissipated by scattering, bending, stretching, and/or rotating the optical fiber. Multiple configurations of these gratings within an optical fiber are given. Devices are presented which can dynamically attenuate, tune, switch, or modulate the wavelength spectral characteristics of an optical signal.
机译:具有方位角扰动的光纤光栅技术领域本发明涉及一种具有方位角扰动的光纤光栅。光纤包括其中形成有多个光栅元件的光纤光栅。光栅元件中的至少一个具有在空间上变化的折射率,该折射率围绕光纤的中心线沿方位角变化。光纤光栅充当带阻光谱滤波器。另外,由于光纤包层模式是弱引导模式,因此可以通过散射,弯曲,拉伸和/或旋转光纤来容易地消散它们的功率。给出了光纤内这些光栅的多种配置。提出了可以动态地衰减,调谐,切换或调制光信号的波长光谱特性的设备。

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