A diagram of the spectral response of a Fiber Bragg Grating (FBG). The reflected power, ${\displaystyle P_{B}(\lambda )}$, is shown as a function of the wavelength, ${\displaystyle \lambda }$. The central wavelength, ${\displaystyle \lambda _{B}}$, is called the Bragg wavelength. The spacing between the first two minima, ${\displaystyle \Delta \lambda _{B}}$, is the bandwidth. The peak reflected power ${\displaystyle P_{B}(\lambda _{B})}$, at the Bragg wavelength is also shown. The secondary peaks are referred to as side lobes.

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