Grating structures within anodized aluminum oxide-clad nanostructured sapphire or silica optical fiber, and techniques for fabricating such grating structures. The grating structures may be Bragg gratings or long-period gratings. The grating structures may exhibit high sensitivity to index of refraction of the surroundings, which can be used for sensing of parameters including temperature, pressure, stress, strain, and chemical composition. The fibers including the grating structures may be suitable for use in harsh environments.

Patent Information: Fiber Grating in Nanostructured Sapphire and Silica Optical fiber: Device Architectures and Fabrication Methods