Agilent 81633A – Optical Power Sensor The Agilent 81633A Optical Power Sensor Modules are specially designed for Agilent 8163A Lightwave Multimeter. 8163A Lightwave Multimeter is a basic measurement tool in the fiber optic industry. Four different power sensor modules (81632A, 81633A, 81634A, 81635A) cover the important wavelengths and power range. 81633A is one of the power sensors. It has excellent accuracy, high linearity, low polarization dependent loss (PDL) and best measurement results are ensured. The measurement speed can come done to 200 microsecond, which fuether optimizes the power measurements. 81633A power sensor also can be used with 8164A Lightwave Measurement System and 8166A Lightwave Multichannel System.