Optical power meter — measures incident power in dBm or watts at one or more calibrated wavelengths. Walk into any fiber test gear catalog and you will see "LSPM kit" listed alongside power meters, light sources, and OTDRs. The acronym is fiber-industry shorthand for Light Source and Power Meter — a matched pair of instruments used together to certify that a fiber link meets its loss budget. As experts in the R&D and manufacturing of advanced test equipment, EXFO contends that an optical time domain reflectometer (OTDR) is the best choice of equipment with which to conduct complete and comprehensive testing and measurement of today's evolving networks. Besides a stabilized light source, an enhanced optical power meter, and an optical talk set, what else do optical loss test sets include in their combined features? What do most optical power meters require when measuring transmit and receive power? What must be done first when measuring end-to-end. Other general purpose light power measuring devices are usually called radiometers, photometers, laser power.
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