Journal ArticleDOI
Large-scale multiplexing of interferometric fiber-optic sensors using TDM and DWDM
Geoffrey A. Cranch,P.J. Nash +1 more
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TLDR
In this article, the authors describe multiplexing schemes for interferometric fiber sensors based on time-division multiplexed and dense wavelength division multiplexer using optical add/drop multiplexers.Abstract:
This paper describes multiplexing schemes for interferometric fiber sensors based on time-division multiplexed and dense wavelength-division multiplexing using optical add/drop multiplexers. The results of an experimental arrangement, which is based on one of the architectures, is also presented. Topics include a discussion of the noise sources in the system, dynamic range, and a characterization of the distributed feedback fiber laser source noise. We show the crosstalk levels in the experimental arrangement to be between -47 and -76 dB depending on the mechanism involved. The multiplexing schemes demonstrate the potential to address at least 192 interferometric sensors through two fibers based on a system with six wavelengths with a phase resolution less than 20 /spl mu/rad//spl radic/Hz. For application to sonar arrays, our analysis has shown that hydrophones multiplexed in this type of architecture would achieve ambient acoustic noise-limited pressure resolution with an in-water dynamic range up to 135 dB at frequencies up to 10 kHz. In general, these architectures would find application in systems requiring very large numbers of sensors with a minimum of telemetry cabling required.read more
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Journal ArticleDOI
Overview of high performance fibre-optic sensing
TL;DR: An overview of fiber-optic interferometry based sensing is given in this paper, particularly as it applies to high-performance sensing applications, and the operation of a fiberoptic sensor as a sensor is reviewed.
Journal ArticleDOI
Large-scale remotely interrogated arrays of fiber-optic interferometric sensors for underwater acoustic applications
TL;DR: The fiber-optic interferometric acoustic sensor array has established itself as a potential alternative to the conventional sonar array based on electroceramic transducers as discussed by the authors, which has applications in military sonar and seismic surveying.
Journal ArticleDOI
Fiber Loop Ringdown — a Time-Domain Sensing Technique for Multi-Function Fiber Optic Sensor Platforms: Current Status and Design Perspectives
TL;DR: The challenging issues in development of multi- function, fiber optic sensors or sensor networks using current fiber optic sensor sensing schemes are discussed and design perspectives on new generation, multi-function, Fiber optic sensor platforms using FLRD technique are particularly presented.
Journal ArticleDOI
Analysis and Optimization of the PGC Method in All Digital Demodulation Systems
TL;DR: In this paper, the influence of low-pass filters (LPF) in the PGC-DCM algorithm was analyzed and a detailed theoretical model of LPF was deduced and revealed that a nonideal LPF is the major limit of linearity in digital systems.
Journal ArticleDOI
Recent developments in seismic seabed oil reservoir monitoring applications using fibre-optic sensing networks
TL;DR: In this article, a review of seismic seabed oil reservoir monitoring techniques using fiber-optic sensing networks is presented, focusing on state-of-the-art fiberoptic hydrophones and accelerometers.
References
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Fiber-Optic Communication Systems
TL;DR: In this article, the authors present an overview of the main components of WDM lightwave communication systems, including the following: 1.1 Geometrical-Optics Description, 2.2 Wave Propagation, 3.3 Dispersion in Single-Mode Fibers, 4.4 Dispersion-Induced Limitations.
Journal ArticleDOI
Acoustic Ambient Noise in the Ocean: Spectra and Sources
TL;DR: In this paper, the authors compared the results of recent ambient-noise investigations, after appropriate processing, on the basis of pressure spectra in the frequency band 1 cps to 20 kc.
Journal ArticleDOI
Novel method for high resolution measurement of laser output spectrum
TL;DR: In this paper, the authors proposed a method by which 50 kHz resolution can be obtained for measuring the spectrum of stabilised semiconductor laser with high spectral spread, and the principle, experimental set up and results are described.
Journal ArticleDOI
Compact all-fiber add-drop-multiplexer using fiber Bragg gratings
TL;DR: In this article, a compact all-single-mode fiber add-drop multiplexer for dense wavelength-division-multiplexing systems is demonstrated, which consists of a polished fiber coupler with identical Bragg gratings within the interactive length.
Journal ArticleDOI
Distributed feedback Er3+-doped fibre laser
TL;DR: In this paper, an Er/sup 3+/-doped distributed feedback fiber laser based on a 36 mm long Bragg grating with a permanently induced /spl pi/2 phaseshift was reported.