High precision micro-displacement fiber sensor through a suspended-core Sagnac interferometer

Bravo, M.; Pinto, A. M. R.; Lopez-Amo, M.; Kobelke, Jens; Schuster, Kay

doi:10.1364/ol.37.000202

Cited by 84 publications

(40 citation statements)

References 9 publications

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“…In the particular case of the structure demonstrated in this work, the displacement sensitivity close to the critical coupling point exceeds 1 dB/µm. For comparison, this sensitivity value is more than two times the sensitivity achieved in [10] using the same bending plates in an interferometric structure. …”

Section: Methodsmentioning

confidence: 81%

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Versatile all-fiber slow-light assisted sensor

et al. 2013

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We present theoretical and experimental results on a slow-light assisted all-fiber configuration that can be used for\ud efficient sensing of a variety of parameters (pressure, displacement...). In particular, we report here a structure that can be\ud transformed into a slow-light assisted displacement sensor capable of sub-micrometric resolution values with a\ud potentially simple intensiometric measurement scheme. The basic element in the structure is a lossy ring resonator tuned\ud close to the critical coupling regime. In this working regime, the resonator transfer function displays extremely high\ud group delay values close to the resonances, and, accordingly, a large sensitivity to additional losses. A mechanic\ud transducer transforms displacement into small additional losses in the ring. This leads to strong variations in the log\ud transmission of the resonances, which are shown to scale with the group index. This scheme shows orders of magnitude\ud sensitivity enhancements over a conventional bending-loss configuration. We believe that this structure can be further\ud developed to provide large sensitivity enhancements to conventional intensiometric fiber sensors

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Section: Methodsmentioning

confidence: 81%

“…We constructed the structure of Figure 3(a) with a fiber coupler, a polarization controller and a precision mechanic attenuator based on stress-inducing plates, similar to the one used in [10] (labeled BP in the Figure). The attenuation in the ring is varied by controlling the displacement of the plates through a precision actuator.…”

Section: Methodsmentioning

confidence: 99%

Versatile all-fiber slow-light assisted sensor

et al. 2013

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show abstract

“…In the particular case of the structure demonstrated in this work, the displacement sensitivity close to the critical coupling point exceeds 1 dB/µm. For comparison, this sensitivity value is more than two times the sensitivity achieved in [11] using the same bending plates in an interferometric structure.…”

Section: Methodsmentioning

confidence: 81%

Turning a low Q fiber resonator into a high-sensitivity displacement sensor using slow light concepts

Bravo¹,

Angulo-Vinuesa²,

Martín‐López³

et al. 2013

SPIE Proceedings

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High-Q resonators have been widely used for sensing purposes. High Q factors normally lead to sharp spectral peaks which accordingly provide a strong sensitivity in spectral interrogation methods. In this work we employ a low-Q ring resonator to develop a high sensitivity sub-micrometric resolution displacement sensor. We use the slow-light effects occurring close to the critical coupling regime to achieve high sensitivity in the device. By tuning the losses in the cavity close to the critical coupling, extremely high group delay variations can be achieved, which in turn introduce strong enhancements of the absorption of the structure. We first validate the concept using an Optical Vector Analyzer (OVA) and then we propose a simple functional scheme for achieving a low-cost interrogation of this kind of sensors.

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“…It has also been an important part of fiber filters and lasers [2]. Normally, the SLI is constructed by connecting the two output ends of a 3 dB coupler to form a closed-path loop.…”

Section: Introductionmentioning

confidence: 99%

Micro Sagnac Loop Beat Wave Interferometer Based on High-Order Modes Coupling in Tightly Twisted Micro Fiber Tapers

Chen

Cheng

Chen

2013

IEEE Photon. Technol. Lett.

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We experimentally demonstrate a micro Sagnac loop beat wave interferometer by twisting a micro-tapered fiber with a diameter of the wavelength scale. The polarizationdependent coupling for the guided lights occurs at the interknitted region repeatedly while the loop serves as a mirror to reflect the guided lights. A longer interaction length of the interknitted region can lead to a narrower free spectral range. The high-order modes can be excited under a tightly twisted condition and the wavelength beating phenomenon can be more explicitly obtained after the multi-cycle coupling.Index Terms-Sagnac loop, wavelength beat, fiber taper.

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High precision micro-displacement fiber sensor through a suspended-core Sagnac interferometer

Cited by 84 publications

References 9 publications

Versatile all-fiber slow-light assisted sensor

Versatile all-fiber slow-light assisted sensor

Turning a low Q fiber resonator into a high-sensitivity displacement sensor using slow light concepts

Micro Sagnac Loop Beat Wave Interferometer Based on High-Order Modes Coupling in Tightly Twisted Micro Fiber Tapers

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