Phase noise considerations in coherent optical FMCW reflectometry

Venkatesh, S.; Sorin, Wayne V.

doi:10.1109/50.249912

Cited by 113 publications

(35 citation statements)

References 12 publications

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“…One of the most widely used techniques is fiber-optic reflectometry based on Fresnel reflection. Two of its major configurations are optical time-domain reflectometry (OTDR) [1,2,3,4,5] and optical frequencydomain reflectometry (OFDR) [6,7,8,9,10]. OTDR, however, generally suffers from its insufficient spatial resolution and relatively long measurement time, whereas OFDR is susceptible to phase fluctuations caused by environmental disturbance.…”

Section: Introductionmentioning

confidence: 99%

Simplified optical correlation-domain reflectometry using polymer fiber

Hayashi

Shizuka

Minakawa

et al. 2015

IEICE Electron. Express

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We develop a simplified configuration of optical correlation-(or coherence-) domain reflectometry (OCDR) using a polymer optical fiber (POF). The conventional reference light path is removed by using as reference light the Fresnel-reflected light caused at the interface between a silica single-mode fiber and the POF. We demonstrate its basic operation and investigate the dependences of the spatial resolution and signal-to-noise ratio (SNR) on the sweep time of the laser modulation frequency. The optimal sweep time is found to be 30 ms (corresponding to a repetition rate of 33 Hz), at which both the resolution and SNR are maintained at high values.

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Section: Introductionmentioning

confidence: 99%

Simplified optical correlation-domain reflectometry using polymer fiber

Hayashi

Shizuka

Minakawa

et al. 2015

IEICE Electron. Express

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“…In most cases, φ(t) and φ(t − τ ) can be regarded as ergodic and zero mean Gaussian random processes [15,16] and satisfy:…”

Section: Principle Of Operationmentioning

confidence: 99%

Performance evaluation of fault-branch detection in TDM passive optical networks by spectral analysis of interferometric signals

et al. 2010

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A new fault-branch detection scheme is proposed to troubleshoot the breaks of any distribution fibers in a timedivision multiplexing (TDM) passive optical network. We employ a continuous optical frequency sweeper at the optical line terminal (OLT) and an interferometric (IF) device at each optical network unit (ONU). By analyzing the spectrum of the returned combined signals at the OLT, we can obtain the status of all branches. This detection method not only uses a small optical frequency band for surveillance monitoring, but is also simple to operate. Furthermore, a modified architecture is proposed to relax the specifications of IF devices. The tolerance of the IF device length was analyzed using the Monte-Carlo simulation method.

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“…From early OFDR implementations over short fibres more than 30 years ago [41], it took a while to reach longer distances, mainly due to the need for coherent sources capable of very linear frequency sweep [42]. To circumvent the issue of the nonlinearity of the frequency sweep, schemes integrating an additional reference interferometer were proposed [43].…”

Section: Optical Frequency Domain Reflectometrymentioning

confidence: 99%

A Review of Distributed Fibre Optic Sensors for Geo-Hydrological Applications

2017

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Featured Application: Distributed fibre optic sensors for geo-hydrological applications: a comprehensive review about methodology, weaknesses, and strengths.Abstract: Distributed optical fibre sensing, employing either Rayleigh, Raman, or Brillouin scattering, is the only physical-contact sensor technology capable of accurately estimating physical fields with spatial continuity along the fibre. This unique feature and the other features of standard optical fibre sensors (e.g., minimal invasiveness and lightweight, remote powering/interrogating capabilities) have for many years promoted the technology to be a promising candidate for geo-hydrological monitoring. Relentless research efforts are being undertaken to bring the technology to complete maturity through laboratory, physical models, and in-situ tests. The application of distributed optical fibre sensors to geo-hydrological monitoring is here reviewed and discussed, along with basic principles and main acquisition techniques. Among the many existing geo-hydrological processes, the emphasis is placed on those related to soil levees, slopes/landslide, and ground subsidence that constitute a significant percentage of current geohazards.

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Phase noise considerations in coherent optical FMCW reflectometry

Cited by 113 publications

References 12 publications

Simplified optical correlation-domain reflectometry using polymer fiber

Simplified optical correlation-domain reflectometry using polymer fiber

Performance evaluation of fault-branch detection in TDM passive optical networks by spectral analysis of interferometric signals

A Review of Distributed Fibre Optic Sensors for Geo-Hydrological Applications

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