1.Basic principles

Fiber Bragg Grating (FBG) is an important online fiber filtering and sensing device, which is usually achieved by periodically modulating the refractive index of the fiber core using ultraviolet laser and phase mask plate. It has reflection filtering function for specific wavelengths of light and can be widely used in fields such as optical communication and optical sensing.

The reflection spectra of weak fiber Bragg gratings are as follows (left is chirped weak grating reflection spectrum, right is uniform weak grating reflection spectrum):

2. Production process

In order to overcome the negative impact of removing the coating layer in the traditional FBG production process, our company has an instrument and equipment for the integrated online preparation of weakly reflective fiber Bragg gratings using a drawing tower. During the fiber drawing process and before the fiber coating, online grating engraving is performed to achieve an integrated process of fiber drawing, grating engraving, and coating, ensuring the mechanical properties of the fiber and greatly simplifying the process complexity of subsequent packaging.

3.Product advantages

Small size, light weight, long lifespan, high mechanical strength, no fusion bonding between sensing points, customized grating wavelength, customized grating coating material, high consistency, no fusion bonding between sensing points, strong reusability, anti electromagnetic interference, anti chemical corrosion,long-distance transmission of sensing signals, and support for large-scale production.The number of weak fiber Bragg gratings can reach tens of thousands of points, and the physical distance between gratings can range from a few millimeters to several meters to tens of meters. All parameters can be customized according to the actual engineering situation.

4.Typical applications

In the fields of intelligent buildings, intelligent transportation, environmental monitoring, temperature/fire monitoring, aerospace, navigation, and military.

5.Product indicators