What is the definition of spectral resolution?

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What is the definition of spectral resolution?

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There are different definitions regarding to the spectral resolution: (a). Display Spectral Resolution: decimal points in the displayed wavelength value. We have 3 decimals in nanometer, which is 1 picometer resolution for displayed wavelength value. (b). Readout Spectral Resolution: This is the minimum value of the wavelength variation which can be detected and reported by this device. For example, If you input a tunable laser signal to the FBGA and tune the laser wavelength by 1pm step, you will see the FBGA reported wavelength value following the tunable laser with each 1pm step. (c). Physical Wavelength Resolution: This is the minimum wavelength spacing between two signal peaks which can still be distinguished as two peaks. Normally, the physical wavelength resolution is not important in FBGA application. The most important thing in FBGA application is the readout spectral resolution. We have 1pm readout spectral resolution in our FBGA products and which is achieved by a special ar

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