19 June 2013 Electro-optic electric-field sensors utilizing Ti∶LiNbO31×2 directional coupler with dipole antennas
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Optical Engineering, 52(6), 064402 (2013). doi:10.1117/1.OE.52.6.064402
Abstract
We have demonstrated a TiLiNbO 3 electro-optic electric-field sensor based on 1×2 directional optical waveguide coupler. The symmetric geometry of the 1×2 directional coupler provided the sensor with unique characteristics of intrinsic 3-dB operating point and two complementary outputs. A DC switching voltage of ∼12  V and an extinction ratio of ∼8.1  dB were observed with the coupler at a wavelength of 1.3 μm. The minimum detectable electric fields are ∼0.99 and ∼1.67  V/m corresponding to a dynamic range of ∼29.5 and ∼25  dB at frequencies of 20 and 50 MHz, respectively. The sensors exhibit almost linear response for the applied electric-field intensity from 0.29 to 29.8  V/m .
© 2013 Society of Photo-Optical Instrumentation Engineers (SPIE)
Hongsik Jung, "Electro-optic electric-field sensors utilizing Ti∶LiNbO31×2 directional coupler with dipole antennas," Optical Engineering 52(6), 064402 (19 June 2013). http://dx.doi.org/10.1117/1.OE.52.6.064402
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KEYWORDS
Sensors

Directional couplers

Antennas

Electro optics

Electro optical sensors

Transmission electron microscopy

Modulators

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