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Fiber optic power meter

An optical power meter is a device which converts light power to a measurable current or voltage that is proportional to the optical input. Fiber optic cable has become the predominant transmission media for telecommunications. In communications, fiber optic cables carry pulsed modulated optical signals, originating from lasers or light emitting diodes, for communicating voice and data signals. Information is encoded on the optical energy by modulating either its power or spectrum. In these systems it is often necessary to monitor the average optical power being carried by a transmission fiber. Average optical power is a useful indicator of system performance, and thus is often used for maintenance and control purposes. The optical power meter function may be used to monitor the power of the laser generating the optical signal, to measure the loss through the transmission medium, to test the receiving electronics, etc. Many fiber optic power meters use a photodiode detector to produce an electrical current that is dependent upon the intensity of light incident upon the detector and an amplifier to produce a voltage proportional to the electrical current. The photoelectric conversion element has wavelength sensitivity characteristics according to which photoelectric conversion element responds to the wavelengths corresponding thereto. To monitor the optical power, the optical fiber is detached from the photodetector associated with the transceiver and the impinging light is attached directly to a separate optical power meter.

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