Bandwidth refers to the passband transmittance rate for the peak transmittance rate of half of the distance between the two positions, sometimes also called half height width (not called half bandwidth), the English letters are often used FWHM (Full Width at Half Maximum) indicates. Detailed bandwidth value is defined as follows: bandwidth is also a tolerance, the tolerance scale is also the size of the bandwidth itself is related to the size of the bandwidth itself, generally speaking, the smaller the bandwidth, the tolerance is also followed by a reduction. The selection of bandwidth is related to the light source used, the wavelength scale of the signal required and the size of the disturbance.

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