Homodyne Demodulation Scheme for Fiber Optic Sensors Using Phase Generated Carrier

Dandridge, A.; Tveten, A. B.; Giallorenzi, T. G.

doi:10.1109/tmtt.1982.1131302

Cited by 211 publications

(93 citation statements)

References 9 publications

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“…The birefringence in the MZI is set to zero. The phase-generated carrier-demodulation method is used to extract the interferometric phase [15]. A birefringence controller is placed in the connecting lead to one of the FBGs, and the phase difference between the two FBGs is measured.…”

Section: Methodsmentioning

confidence: 99%

Polarization properties of interferometrically interrogated fiber Bragg grating and tandem-interferometer strain sensors

Cranch

Flockhart

Kirkendall

2006

J. Lightwave Technol.

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Abstract-Lead sensitivity in low-coherence interferometric fiber-optic sensors is a well-known problem. It can lead to a severe degradation in the sensor resolution and accuracy through its effect on the fringe visibility and interferometric phase. These sensitivities have been attributed to birefringence in the various components. In the current work, an analysis of the polarization properties of fiber Bragg grating and tandem-interferometer strain sensors, using Stokes calculus and the Poincaré sphere, is presented. The responses of these sensors as a function of the birefringence properties of the various components under different illuminating conditions are derived. The predicted responses demonstrate very good agreement with experimentally measured responses. These models provide a clear insight into the evolution of the polarization states through the sensor networks. Methods to overcome the lead sensitivity are discussed and demonstrated, which yield a differential strain measurement accuracy of 18 nε · rms for a fiber Bragg grating sensor.

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Section: Methodsmentioning

confidence: 99%

Polarization properties of interferometrically interrogated fiber Bragg grating and tandem-interferometer strain sensors

Cranch

Flockhart

Kirkendall

2006

J. Lightwave Technol.

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“…The reference arm is made entirely from SMF. A single wavelength laser with its frequency modulated is used as the light source and the output from the interferometer is detected by a photo-detector and demodulated by a phase generated carrier (PGC) demodulation system [16,17]. The HC-PBF samples are coiled to a diameter of ~11 cm (Fig.…”

Section: Fabrication Of Hc-pbf Samples For Acoustic Sensingmentioning

confidence: 99%

Enhancement of acoustic sensitivity of hollow-core photonic bandgap fibers

Yang

Jin

et al. 2013

Opt. Express

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The acoustic pressure sensitivities of hollow-core photonic bandgap fibers (HC-PBFs) with different thicknesses of silica outercladding and polymer jacket were experimentally investigated. Experiment with a HC-PBF with 7 μm-thick silica outer cladding and 100 μm-thick Parylene C jacket demonstrated a pressure sensitivity 10 dB higher than the commercial HC-1550-02 fiber and 25 dB higher than a standard single mode fiber. The significant enhancement in sensitivity would simplify the design of fiber hydrophone arrays and increase the number of sensors that could be multiplexed in a single fiber.

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“…The phase-generated carrier demodulation technique was first proposed by Giallorenzi in 1982 (Dandridge et al, 1982). It is a homodyne demodulation technique which eliminates signal fading as slow environmental perturbations drift the interferometer's path length difference away from quadrature.…”

Section: Modulation and Demodulation Techniquesmentioning

confidence: 99%