Tag: Fiber optics
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Power Measurement in Fiber Optics, How it is Done
Optical Power The basic unit of measurement in fiber optics is the light power. Just like electric power, optic power is measured in watts. For light, the total energy Q is given by: Q = NQp Where Qp is the energy of a single photon and N is the number of photons, therefore: The Power…
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Optical Time Domain Reflectometer (OTDR)
The commonly employed technique for analysing the state of a fibre optic is to test it with an Optical Time Domain Reflectometer (OTDR). The OTDR uses backscattered light of the fibre to imply loss. The OTDR works is similar way to RADAR, sending a high power laser light pulse down the fibre and looking for…