A Bragg Grating is a type of optical filter that is built directly into an optical fiber. It is a type of interferometric technique that utilizes the interference of light waves, which create regions of higher and lower refractive indices in the core of the fiber. This type of optical filter is often used in cables, such as fiber-optic cables, to filter out certain wavelengths of light.
In order to create a Bragg Grating, the fiber must first be made photosensitive by exposing the fiber to deep UV light. Then, a grating is used to impose a periodic modulation of the refractive index to the core of the fiber. This creates a periodic variation of the refractive index along the fiber, which is known as Bragg Grating.
The Bragg Grating acts as an optical filter, and it is able to reflect or transmit different wavelengths of light depending on the strength and spacing of the grating. This technique is used in cables to filter out certain wavelengths of light. For example, in fiber-optic cables, Bragg Gratings are used to filter out wavelengths of light that could interfere with transmission.
Bragg Gratings are also used to reduce the effects of noise on fibers. This is done by using Bragg Gratings to create a section of the fiber that is reflective, so that any noise that is generated is reflected back and does not propagate down the fiber.
In conclusion, Bragg Gratings are a type of optical filter that is built directly into an optical fiber. They are used in cables to filter out certain wavelengths of light and to reduce the effects of noise. They are created by exposing the fiber to deep UV light through a grating, which causes the refractive index in the core of the fiber to vary periodically.
