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Specifications and Regulatory Information
Specifications
Option 006 Wavelength Calibrator
The wavelength calibrator option provides an onboard wavelength reference that can be used to
automatically calibrate the optical spectrum analyzer. The calibrator is based on an EELED and an
Acetylene gas absorption cell.
Wavelength Calibrator Block Diagram
The acetylene absorbs light at very specific wavelengths based on the molecular properties of
gas. The cell is illuminated by an EELED and the OSA uses the absorption pits to perform a wave-
length calibration. Since the absorption of the acetylene gas is a physical constant, it never needs
calibrating.
Wavelength calibrator absorption spectrum
The wavelength calibrator enhances the OSA to achieve better than ±10 pm wavelength accu-
racy and removes the need to use a tunable laser source and multi-wavelength meter as an
external reference.
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