Phase sensitive investigations of 3×3 singlemode fibre directional couplers

Schliep, F.; Hereth, R.; Schiffner, G.

doi:10.1049/el:19930045

Cited by 11 publications

(4 citation statements)

References 4 publications

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Section: Absolute Wavelength Calibrationmentioning

confidence: 99%

“…The procedure, illustrated in Fig. 1, follows photodetector and interferometer calibration [4], and relies on brief modulation of the optical path difference (OPD) in the interferometer, which is thereafter held steady during the primary measurement stage. During brief OPD tuning, the chosen multiplexing method may be used to monitor simultaneously the phase change δφ on all sensor FBG channels and a local static wavelength reference, which may take the form of an FBG with athermal packaging or that is configured to track an absorption line [5].…”

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confidence: 99%

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Absolute wavelength calibration technique for multiplexing interferometric fibre Bragg grating sensor interrogation systems

Orr

Niewczas

2013

Electron. lett.

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The advent of multiplexing interferometric schemes for fibre Bragg grating (FBG) sensor interrogation has enabled the combination of large-scale multiplexing and high-resolution measurement. In this letter, we describe a fast and simple technique to add absolute wavelength measurement capabilities to any passive-interferometric multiplexer. Through simulation we demonstrate a wavelength accuracy of <10 pm using common system specifications. The technique allows high-resolution interferometric interrogation to be applied to many key industrial applications requiring precise knowledge of absolute values, such as static temperature, without trading off high interrogation rate or resolution

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Section: Absolute Wavelength Calibrationmentioning

confidence: 99%

mentioning

confidence: 99%

Absolute wavelength calibration technique for multiplexing interferometric fibre Bragg grating sensor interrogation systems

Orr

Niewczas

2013

Electron. lett.

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“…Here we describe a technique for determining initial FBG wavelengths in a remote sensor array during the start-up procedure of any multiplexing passiveinterferometric interrogator, and report on a preliminary laboratory implementation of the scheme as used to augment the TDM interrogator described above. The procedure, illustrated in Figure 3, follows after photodetector and MZI calibration 12 , and relies on brief modulation of the optical path difference in the MZI -which is thereafter held steady during the primary measurement stage. Using a local static wavelength reference in the form of an athermal FBG, or an FBG configured to track an absorption line 13 , the chosen multiplexing technique may be used to monitor the phase change Δφ on all FBG channels.…”

Section: Initial Wavelength Calibrationmentioning

confidence: 99%

Interferometric time division FBG interrogator and multiplexer with static, dynamic, and absolute wavelength measurement capabilities

2012

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We report on the design and preliminary testing of an interferometric interrogator capable of large-scale time-division multiplexing of FBG sensors. The scheme employs a passive algorithm for phase demodulation, allowing changes in FBG sensor reflected wavelengths to be calculated instantaneously upon arrival, and incorporates a technique for identification of initial absolute sensor wavelengths in order to overcome the measurement ambiguity associated with interferometric schemes. The proposed system will allow for high-speed interrogation of large-scale FBG sensor arrays with interferometric resolution and the capability for dynamic, static, and absolute FBG wavelength measurement

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“…where a n and b n are the amplitudes of the dc and ac components of the interference fringes respectively, and θ n is the initial phase (nominally 0°, 120°, -120° for n = 1, 2, 3). By modulating the interferometer by at least 2π during initial system calibration, the above values can be determined for each of the three output channels using an established technique [13]. If normalised constants are prepared (…”

Section: A Instantaneous Phase Demodulationmentioning

confidence: 99%

High-Speed, Solid State, Interferometric Interrogator and Multiplexer for Fiber Bragg Grating Sensors

Orr

Niewczas

2011

J. Lightwave Technol.

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We report on the design and prototyping of a robust high-speed interferometric multiplexer and interrogator for fibre Bragg grating sensors. The scheme is based on the combination of active WDM channel switching and passive, instantaneous interferometry, allowing the resolution of virgin interferometric interrogators to be retained at MHz multiplexing rates. In this article the system design and operation are described, and a prototype scheme is characterised for three sensors and a multiplexing rate of 4 kHz, demonstrating a noise floor of 10 nε/√Hz and no cross-sensitivity. It is proposed that the system will be applicable to demanding monitoring applications requiring high speed and high resolution measurements across the sensor array.

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Phase sensitive investigations of 3×3 singlemode fibre directional couplers

Cited by 11 publications

References 4 publications

Absolute wavelength calibration technique for multiplexing interferometric fibre Bragg grating sensor interrogation systems

Absolute wavelength calibration technique for multiplexing interferometric fibre Bragg grating sensor interrogation systems

Interferometric time division FBG interrogator and multiplexer with static, dynamic, and absolute wavelength measurement capabilities

High-Speed, Solid State, Interferometric Interrogator and Multiplexer for Fiber Bragg Grating Sensors

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