Integrated broadband fiber optical E-field-sensor for EMC-applications

We present an integrated fiberoptic E-field sensor covering a frequency range from 100 MHz up to 6 GHz. The sensor provides a maximum dynamic range of 93 dB and a minimum detectable field of 30 mV/m. The size of the probe head can be limited to 1 cm/sup 3/ which is the benefit of using a small and efficient MQW electroabsorption modulator instead of a conventional LiNbO/sub 3/ device. Together with the small dipole antenna size of 8 mm this results in a high spatial resolution and allows measurements even in small cavities which are not accessible to larger sensors.

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