Devices composed of fiber Bragg gratings are
Fiber Bragg gratings (FBGs) are used to make optical filters, fiber lasers, and highly sensitive sensors for strain, temperature, and pressure.
Optical Devices
FBGs can be used as inline optical filters that reflect specific wavelengths while transmitting others, making them ideal for wavelength-selective components in telecommunications systems . They are also used as mirrors in narrow-linewidth distributed Bragg reflector (DBR) and distributed feedback (DFB) fiber lasers, enabling precise control of laser emission . Special FBG types, such as chirped gratings, are employed for dispersion compensation and pulse shaping in ultrafast laser systems .
Sensing Devices
FBGs are widely used in fiber-optic sensors due to their sensitivity to environmental changes. They can measure strain, temperature, and pressure with high precision . These sensors are suitable for harsh environments, including wet, hot, or dirty conditions, and are commonly deployed in bridges, tunnels, pipelines, and industrial machinery for structural health monitoring and safety applications .
Specialized Applications
- Chirped FBGs: Used for temporal control of light, such as creating delays between wavelengths in chirped pulse amplification systems .
- Tilted FBGs: Function as notch filters to reject unwanted wavelengths .
- Long-period gratings: Employed for gain equalization in optical amplifiers . FBGs are highly versatile, compact, and capable of replacing bulky free-space optical components, making them essential in telecommunications, aerospace, medical devices, and industrial monitoring . Their ability to precisely control light and detect environmental changes allows for the creation of both active optical devices and passive sensing systems.
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