Wavelength Accuracy, Wavelength Repeatability, and Wavelength Linearity Specification Explanation

Wavelength accuracy:
Wavelength accuracy is a tolerance to the true value of a measured value when the standard wavelength is measured.
Wavelength repeatability:
Wavelength repeatability is the stability of wavelength measurement. It is a tolerance to wavelength drift, when a certain wavelength is swept repeatedly for 1 minute. A measured wavelength should not drift within a range of wavelength (specified in wavelength accuracy at each sweep), it must be stable within a specified wavelength repeatability.
Wavelength linearity:
Wavelength linearity specifies a width of error dispersion between a measured value and a true value at plural wavelengths. In this case, it specifies a degree of an error dispersion but not an error of absolute wavelength. Therefore, it may display a relative reliability of a wavelength of the spectrum. If there is an error of absolute wavelength, all of the spectrum may be shifted.

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