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Measuring the Sensitivity of the OMH-6709B Optical Measurement Head

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Measuring the Sensitivity of the OMH-6709B Optical Measurement Head

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The OMH-6709B is the latest edition to a family of Optical Measurement Heads used with the OMM-6810B. It offers a large dynamic range for very stable fiber optic power measurements in the near-IR. The OMM6810B uses a transimpedance amplifier with several gain stages to convert the signal from the InGaAs photodiode sensor to voltage: with Rf is the feedback resistance of the gain stage, and r(l) the responsivity of the photodiode. Unfortunately DC drift in the amplifier and noise from the photodiode and amplifier will limit maximum sensitivity. A zeroing procedure helps eliminate the effects of the DC drift but the noise of the system can only be minimized.

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