In-fiber integrated Michelson interferometer

Yuan, Libo; Liu, Zhihai; Sun, Jiaxing

doi:10.1364/ol.31.002692

Cited by 85 publications

(50 citation statements)

References 6 publications

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“…One end of the plate is fixed and the other end can be applied strain and bending. At the end of the cantilever fiber beam, bending the twin-core fiber appropriately, it will introduce OPD of about 110μm [5], while the OPD will be smaller if the connecting line between the two cores and the bending are not in the same plane. Fig.…”

Section: Experiments and Resultsmentioning

confidence: 99%

“…Where A 11 , A 12 , A 21 , A 22 are the amplitude constant; we suppose A 11 =A 12 =A 21 =A 22 when the reflection is low, and A 2 11 =I 0 ; φ 0 is the initial phase; φ F is the phase difference of the FP air cavity, and φ M is the phase difference between the two cores of the Michelson interferometer [5]. The intensity of the composite interferometer signal can be given by …”

Section: Working Principlementioning

confidence: 99%

“…In order to improve the measurement accuracy, and meet the demands for sensor integration and miniaturization, a variety of mixed interferometer structures have been developed [1][2][3][4] , and the performance of interferometers is greatly improved. In addition, due to the use of multi-core fiber [5] and photonic crystal fiber [6] , Michelson interferometers have been able to be integrated into single fibers to fabricate many integrated devices such as sensors [7] , filters [8] and modulations [9] .…”

Section: Introductionmentioning

confidence: 99%

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Twin-core fiber-based sensor for measuring the strain and bending simultaneously

et al. 2013

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A novel composite interferometer sensor is presented and its sensing characteristics are investigated. Based on the infiber integrated Michelson interferometer, a quartz tube is used to encapsulate the ends of the twin-core fiber and single mode fiber to form the dual extrinsic FP cavities. Thereby, the Michelson and FP configurations are integrated into a single fiber, which we call it Michelson-FP composite interferometer sensor. The novel sensor can respond to the axial strain and radial bending simultaneously. We have derived and analyzed the interferometer principle of the new structure. The analysis results show that the interferometer sensor could be considered as the superposition of Michelson interferometer and FP interferometer. Moreover, we establish a testing system and conduct a series of experiments to investigate the strain and bending characteristics. We measure the reflection spectra with the spectrum analyzer. The spectral response of the composite interferometer sensor presents two pattern fringes with different frequencies due to the respective optical path interferometers. The experimental results indicate that the composite interferometer sensor is very sensitive to the strain and bending characteristics, and the presented sensor has different strain and bending sensitivity coefficients. Due to these characteristics, the presented sensor might be able to measure the strain and bending characteristics simultaneously. In conclusion, the presented novel interferometer sensor is of compact structure, high integration and good strain and bending sensing characteristics. Thus, many types of fiber-optic sensors may be built based on it.Keywords: twin-core fiber, Michelson interferometer, Fabry-Perot interferometer, Michelson-FP composite interferometer sensor, simultaneous measurement of strain and bending characteristics.

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Section: Experiments and Resultsmentioning

confidence: 99%

Section: Working Principlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Twin-core fiber-based sensor for measuring the strain and bending simultaneously

et al. 2013

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“…By controlling the taper diameter and its length one can tailor the performance of the interferometer in a similar manner than those based on tapered conventional fibers [46,47]. Tapering dual core fiber or photonic bandgap PCF also allows the development of interferometers [48,49] but in these cases the voids of the PCF are not collapsed.…”

Section: Interferometers Built Tapered Pcfsmentioning

confidence: 99%

Highly Sensitive Sensors Based on Photonic Crystal Fiber Modal Interferometers

et al. 2009

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We review the research on photonic crystal fiber modal interferometers with emphasis placed on the characteristics that make them attractive for different sensing applications. The fabrication of such interferometers is carried out with different post-processing techniques such as grating inscription, tapering or cleaving, and splicing. In general photonic crystal fiber interferometers exhibit low thermal sensitivity while their applications range from sensing strain or temperature to refractive index and volatile organic compounds.

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“…For this purpose, several techniques have been developed to build interferometer inside a string of fiber [3][4] called in-fiber integrated interferometers. The group of in-fiber integrated interferometers where the interferometric phase difference is built up referring to the difference in the effective refractive index of different fiber modes [5][6][7][8], the difference in the optical path [9,10] as well as the difference in multi-core of one fiber [5,11,12], have been widely researched in the context of environmental sensing, curvature sensing, and others. These structures are attractive for several reasons, including small size and deployment flexibility, as well as the presence of reduced thermal sensitivity in view of usually small difference of the thermo-optic coefficients of the fiber core and cladding under concern.…”

Section: Introductionmentioning

confidence: 99%