Phase sensitive measurement technique for singlemode fibre directional couplers

Schliep, F.; Hereth, R.

doi:10.1049/el:19920977

Cited by 6 publications

(2 citation statements)

References 4 publications

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“…In previous work, normalisation parameters, µ m and γ m , were calculated by thermally or mechanically tuning a reference Bragg peak across the interferometer's fringes. During this calibration procedure, the amplitudes and dc offsets of the voltage responses were used in conjunction with a technique developed by Hereth and Schliep to evaluate µ m and γ m [8]. The calculated parameters for this FBG were then applied to all others in the array.…”

Section: A Phase Calibrationmentioning

confidence: 99%

High-Speed Interferometric FBG Interrogator With Dynamic and Absolute Wavelength Measurement Capability

Perry

Orr

Niewczas

et al. 2013

J. Lightwave Technol.

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A passive, interferrometric wavelength demodulation technique has been extended to measure the absolute wavelengths of a multiplexed array of fiber Bragg grating sensors. The scheme retains its original strain resolution of 10 nε/ √ Hz. A proof-of-concept interrogation system was able to determine the absolute wavelength of Bragg peaks to within 20 pm (17 µε). Static and dynamic Bragg grating strains were accurately demodulated in both absolute and relative wavelength measurement modes. This demonstration indicates that interferometric techniques are able to provide absolute, static and dynamic measurements of strain within a single platform.

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Section: A Phase Calibrationmentioning

confidence: 99%

High-Speed Interferometric FBG Interrogator With Dynamic and Absolute Wavelength Measurement Capability

Perry

Orr

Niewczas

et al. 2013

J. Lightwave Technol.

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“…It is well known that standard couplers exhibit birefringence and that the splitting ratio depends on the input polarization state as does the phase shift between the split waves 1p@2 for an ideal 2 3 2 cou-pler2. 2,3,[12][13][14] This happens because in general the fiber directional coupler is not exactly a symmetrical element. Here we show both theoretically and experimentally that this characteristic of the fiber coupler can seriously affect the efficiency of the Faradayrotator-based schemes in eliminating the polarizationinduced noise.…”

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confidence: 99%

Polarization-induced noise in a fiber-optic Michelson interferometer with Faraday rotator mirror elements

1995

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Faraday rotator mirror elements have been used in a number of applications as compensators for induced birefringence in retracing paths. In interferometric systems, such as the fiber-optic Michelson interferometer, this approach proved to be useful in providing maximum fringe visibility and insensitivity to the polarization state of light injected into the interferometer. However, it is found that, when the characteristics of the fiber coupler depend on the polarization state of the input beam, the efficiency of the Faraday mirror elements is limited. Theoretical analysis and experimental results in support of this statement are presented.

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