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Abstract

A photonic radio-frequency (RF) field probe for detecting and measuring RF fields incorporates a probe head, a fiber cable and a photodetector/power-laser unit. An antenna drives a small, fiber-coupled laser, biased by a fiber-coupled optical power converter through series resistors, together with electrical connections and supporting apparatus. Methods of calibration include use of a reference oscillator in the probe head, use of the relationship between optical power sent to the optical power converter and resulting photodetector signal, and measurement of signal-fiber attenuation from light reflected by the laser in the probe head. Other probe embodiments utilize a reflective multiple quantum well modulator and embodiments which measure all three directional components of the RF field.

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First Claim