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Automatic Wavelength Compensation of Photodiode Power Measurements Using the OMM-6810B Optical Multimeter

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Automatic Wavelength Compensation of Photodiode Power Measurements Using the OMM-6810B Optical Multimeter

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To accurately measure optical power with a photodiode, the wavelength of the source must be known. This Technical Note describes the advantages of measuring wavelength and power simultaneously.The responsivity curves for typical Silicon and InGaAs type detectors are shown in Graphs 1 and 2. These graphs also show the percent change in responsivity per nanometer. This information may be used to calculate the power reading error due to inaccuracy in wavelength measurement. For example, if measuring a 1555 nm source and the wavelength is entered into a conventional power meter as 1550 nm, this could cause a power reading error as high as 5%.

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