Electro-optic mapping systems of electric-field using CW laser diodes |
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| Authors: | WK Kuo CH Pai SL Huang HY Chou HS Huang |
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| Institution: | aDepartment of Electro-Optics Engineering, National Huwei University of Science & Technology, 64 Wenhua Road, Huwei, Yunlin, Taiwan 63208, ROC;bInstitute of Electro-Optical Engineering, National Sun Yat-Sen University, Taiwan, ROC;cPrecision Instrument Development Center, National Science Council, Taiwan, ROC |
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| Abstract: | Two novel systems are proposed to perform the electro-optic (EO) mapping of the electric-field strength close to electrode structure using CW laser diodes. By these systems, mappings of both static (DC) and high-frequency electric-field can be obtained. For the static field, the field is chopped to increase the sensitivity performance. For the high-frequency field, an intensity modulation laser, instead of a pulse laser, is used to perform the mapping measurement in frequency domain, instead of in time domain. This approach greatly simplifies the system. An experiment set-up using a vertical cavity surface emitted laser diode (VCSEL) of a wavelength 850 nm and its mapping results for a coplanar waveguide (CPW) with the signal frequency around 1 GHz are reported. |
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| Keywords: | Electric field measurement Electro-optic mapping Laser diode VCSEL |
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