Electro-optic sensor from high-Q resonance between optical D-fiber and slab waveguide

Gibson, Richard; Selfridge, Richard H.; Schultz, Stephen M.

doi:10.1109/cleo.2008.4551212

Cited by 4 publications

(7 citation statements)

References 7 publications

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“…This technology is called slab coupled optical fiber sensing (SCOS) [2][3]. This sensing technology does not perturb the electric fields because it is nonmetallic and has a small cross-sectional area.…”

Section: Introductionmentioning

confidence: 99%

Multi-axial fiber-optic electric field sensor

et al. 2010

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High powered microwave weapons use electric fields to overload electronics. We developed a non-intrusive sensor using a technology based on slab coupled optical sensing (SCOS). Each sensor detects the electric field component normal to the surface of the slab. By mounting two of these sensors orthogonally to each other, a more complete image of the electrical field can be obtained. One of the major hurdles of creating a multi-axial SCOS is keeping the size of the sensor small. The size is limited by (1) the size of the sensing material and (2) the ability to package the sensor to maintain its structural integrity and orientation. Good sensitivity is attained with SCOS with a length less than 3 mm and the D-fiber platform has a small core which allows for much less bending loss than standard single mode fiber. We have developed a mounting system that is heat resistant and structurally robust to protect the sensor that is extremely small when compared to traditional electric field sensors.

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Section: Introductionmentioning

confidence: 99%

Multi-axial fiber-optic electric field sensor

et al. 2010

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“…In addition, the small size enables the sensors to be placed in virtually any environment suitable for an optical fiber. Although the small sensor size is advantageous for many applications, its small sensing region reduces its sensitivity 7 .…”

Section: Introductionmentioning

confidence: 99%

“…Evanescent wave coupling occurs between the two waveguides due to their close proximity but only for mode indices that match. The mode indices match at specific wavelengths as given by 7 (1) where N is the effective index of the fiber mode, n s is the bulk refractive index of the slab waveguide, t is the thickness of the slab waveguide, and m is the mode number. Figure 2 shows a SCOS transmission spectrum, which consists of periodic resonance dips where optical coupling has occurred.…”

Section: Introductionmentioning

confidence: 99%

Improvements in electric field sensor sensitivity by exploiting a tangential field configuration

et al. 2013

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This paper presents improvements to slab-coupled optical fiber sensors (SCOS) for electric-field sensing. The improvements are based on changing the crystal cut and orientation of the slab waveguide in combination with altering the input light polarization. Traditional SCOS are fabricated using z-cut potassium titanyl phosphate crystals and are operated with TM polarized light. They have been shown to detect fields as low as 100 V/m. By using an x-cut crystal and TE polarized light, the sensitivity to electric fields is increased 8x due to, primarily, an increase in electric field penetration into the slab by exploiting a tangential boundary condition, and secondly, an increase to the effective electrooptic coefficient of the slab.

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“…Slab-coupled optical sensors (SCOSs) provide an effective alternative for electric-field sensing applications requiring small, minimally intrusive electricfield sensors. SCOSs use resonant coupling of light between a D-shaped optical fiber and a nonlinear electro-optic (EO) slab waveguide [4]. The sensor consists entirely of dielectric materials and is only slightly larger than an optical fiber, which minimizes electric-field perturbation and results in precise field localization [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Improvements in electric-field sensor sensitivity by exploiting a tangential field condition

et al. 2013

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This paper presents improvements to slab-coupled optical fiber sensors for electric-field sensing. The sensors are comprised of a potassium titanyl phosphate (KTP) crystal mounted on a D-fiber. The improvements are based on changing the crystal orientation, which enhances sensitivity due to a combined increase in the effective electro-optic coefficient and electric-field penetration into the KTP crystal. The paper provides a detailed comparison of the improved sensor, which uses x-cut KTP to the previous sensor design using z-cut KTP. The measurements show an 8.6× improvement in the sensitivity.

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Electro-optic sensor from high-Q resonance between optical D-fiber and slab waveguide

Cited by 4 publications

References 7 publications

Multi-axial fiber-optic electric field sensor

Multi-axial fiber-optic electric field sensor

Improvements in electric field sensor sensitivity by exploiting a tangential field configuration

Improvements in electric-field sensor sensitivity by exploiting a tangential field condition

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