A fiber grating is a diffraction grating formed by axially modulating the refractive index of a fiber core by a certain method, and is a passive filter device.

Since the grating fiber has the advantages of small size, low splice loss, full compatibility with the optical fiber, and the ability to embed smart materials, and its resonant wavelength is sensitive to changes in the external environment such as temperature, strain, refractive index, and concentration, the optical fiber communication, Fiber optic sensing and fiber optic signal processing and other fields have been widely used.

At present, Box optronics can produce a variety of fiber grating products such as uniform fiber gratings, apodized fiber gratings, germanium fiber gratings, and phase-shifted fiber gratings. Products are mainly used in fiber grating sensors, fiber grating filters, pump lasers, fiber lasers.