The Anritsu MG9586A Wavelength Reference Light Source is a light source that uses acetylene having absorption lines of which physical wavelengths are hightly stable. Acetylene gas has a property which absorbs the optical spectrum of a specific wavelength. Therefore, when a broad light, such as the SLD light source, is launched into the acetylene, a Dip (absorption) occurs in the light spectrum of the output light at specified wavelengths. The Dip wavelength (absorption line wavelength) that has been known can be measured, utilizing this characteristic, then having the measured value as the reference value allows the wavelength axis be calibrated. As a result, the wavelength accuracy can be improved.

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