Article Overview
Fiber Bragg Gratings (FBGs) are used in optical sensing, telecommunications, and medical applications due to their ability to reflect specific wavelengths and respond to environmental changes.
Optical Sensing
FBGs are widely used as sensors for strain, temperature, pressure, vibration, and acceleration. When an FBG experiences strain or temperature changes, the spacing of its refractive index modulation shifts, altering the reflected Bragg wavelength. This shift can be precisely measured to determine the physical parameter, making FBGs highly effective in structural health monitoring, aerospace, civil engineering, and industrial applications .
Telecommunications
In telecom systems, FBGs function as narrowband optical filters and dispersion compensators. They can selectively reflect specific wavelengths while transmitting others, which is essential for wavelength division multiplexing (WDM) systems. FBGs also serve as mirrors in distributed feedback (DFB) and distributed Bragg reflector (DBR) fiber lasers, enabling stable, wavelength-specific laser operation .
Medical Applications
FBGs are increasingly applied in biosensing and medical imaging. Their high sensitivity allows detection of biomarkers and monitoring of physiological parameters. They are also used in optical coherence tomography (OCT) and other imaging techniques, providing precise, minimally invasive measurements .
Advantages
FBGs are immune to electromagnetic interference, can operate in explosive or harsh environments, and allow multiplexing of multiple sensors along a single fiber. They are compact, lightweight, and capable of long-distance signal transmission with low loss, making them versatile for both industrial and scientific applications . In summary, Fiber Bragg Gratings are versatile optical devices used for precise sensing, wavelength-specific filtering in telecommunications, and advanced medical diagnostics, with the ability to operate reliably in challenging environments.
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