The Brolight's high-speed detectors contain an integrated PIN photodiode with high response speed. Depending on the detection wavelength range, Si or InGaAs material models are available. The photodiode converts optical power into current through the photovoltaic effect. When terminated into 50Ω into an oscilloscope, the pulsewidth of a laser can be measured.
All Brolight high-speed detectors come with their own internal bias supply consisting of long-life lithium cells. Plugging a coaxial cable into the photodetector's BNC output connector and terminating into 50Ω at the oscilloscope or spectrum analyzer is all that is required for operation.
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