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# Bragg_FINAL.gif

## Appears In

                        - Hooked on Photonics? Math to the Rescue

A fiber Bragg grating is a sensor etched into a fiber optic cable. This animation shows the basic operating principle. At one temperature (say, 20 degrees Celsius), the grating allows all wavelengths except a narrow band (in this example, green light) to pass through the fiber. At another temperature (say, 25 degrees Celsius), the grating allows all but a different band of wavelengths (in this example, red light) to pass through.

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