New OTDR Measurement and Monitoring Techniques

Champavere, A.

doi:10.1364/ofc.2014.w3d.1

Cited by 8 publications

(4 citation statements)

References 2 publications

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“…Non-coherent optical time domain reflectometry (OTDR) technology has been used for a long time for long-range monitoring of the quality and the integrity of fiber optic cable infrastructure [5], e.g., to locate break points in underwater fiber cables. Distributed acoustic sensing (DAS), a special variant of coherent (or phase sensitive) OTDR, is not only able to assess the cable quality but also to detect and locate strain and temperature changes along the cable with high sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Train Tracking from Distributed Acoustic Sensing Data

et al. 2020

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In the context of railway safety, it is crucial to know the positions of all trains moving along the infrastructure. In this contribution, we present an algorithm that extracts the positions of moving trains for a given point in time from Distributed Acoustic Sensing (DAS) signals. These signals are obtained by injecting light pulses into an optical fiber close to the railway tracks and measuring the Rayleigh backscatter. We show that the vibrations of moving objects can be identified and tracked in real-time yielding train positions every second. To speed up the algorithm, we describe how the calculations can partly be based on graphical processing units. The tracking quality is assessed by counting the inaccurate and lost train tracks for two different types of cable installations.

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Section: Introductionmentioning

confidence: 99%

Real-Time Train Tracking from Distributed Acoustic Sensing Data

et al. 2020

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“…However, the probe pulse generator makes the OTDR an expensive solution and, additionally, it is unsuitable to test short‐length optical fibers links, since the reduction of the probe optical pulse width required to improve the spatial resolution, imposing a dead zone region . Recently, in order to reduce costs, the OTDR functionality started to be embedded in most of the commercial transceiver equipment . Furthermore, coherent reflectometry techniques, like the optical frequency‐domain reflectometer (OFDR), have important advantages over the OTDR technique, such as: higher sensitivity, larger dynamic range, and improved resolution.…”

Section: Introductionmentioning

confidence: 99%

“…5 Recently, in order to reduce costs, the OTDR functionality started to be embedded in most of the commercial transceiver equipment. 6 Furthermore, coherent reflectometry techniques, like the optical frequency-domain reflectometer (OFDR), have important advantages over the OTDR technique, such as: higher sensitivity, larger dynamic range, and improved resolution. Yet, the OFDR involves great computational effort which increases the technique expensiveness.…”

Section: Introductionmentioning

confidence: 99%

Improved method for the intraoffice infrastructure optical fiber fault location the based on reflectometric analyses

Pereira

Madureira²,

André

2019

Micro & Optical Tech Letters

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The monitoring of the optical fiber infrastructure, especially within the interoffice range, is an essential procedure for the maintenance of the quality of service. Many fiber monitoring techniques can be employed, nevertheless the majority of these methods carry unbearable costs and do not allow a permanent fiber fault examination. In this article, we propose a low‐cost monitoring technique for implementation in reconfigurable optical add‐drop multiplexer architectures. This method makes use of the optical payload itself to assess the integrity of the interoffice fiber section. Our results shown that, considering the broadcast of synchronous digital hierarchy signals, an operation range up to 6.5 km can achieved.

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“…As a consequence, the research for a practical and effective monitoring scheme is essential. Conventional optical time domain reflectometry (OTDR) has been widely used as an indispensable tool to characterize a fiber link in point-to-point (P2P) technologies [6] . Besides, OTDR is also used to measure the vibrations [7] .…”

mentioning

confidence: 99%

Fault monitoring in passive optical network using code division multiplex-based dual-OTDR traces comparison

et al. 2017

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A dual optical time domain reflectometry (OTDR) system, which employs two different continuous waves at the optical line terminal and a pair of fiber Bragg gratings at the end of each optical network unit, is proposed in a time-division multiplexing passive optical network (PON). The proposed scheme accomplishes the fiber fault monitoring by comparing the different wavelength's testing curves. Complete complementary code is utilized to measure multiple wavelength signals simultaneously with only one receiver and to improve the dynamic range of this system. The PON system consisting of 20 km feeding fiber and a 1:16 splitter is investigated by the experiments. The experimental results show that the faulty branch can be successfully identified by using our scheme. What is more, we also demonstrate that our scheme can be applied to the multi-stage PON.

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New OTDR Measurement and Monitoring Techniques

Abstract: Since its first introduction three decades ago, optical-time-division reflectometry has become an indispensable tool to characterize fiber optic links in long-distance and local-area networks. We review the evolution of this technology and discuss emerging applications.

Cited by 8 publications

References 2 publications

Real-Time Train Tracking from Distributed Acoustic Sensing Data

Real-Time Train Tracking from Distributed Acoustic Sensing Data

Improved method for the intraoffice infrastructure optical fiber fault location the based on reflectometric analyses

Fault monitoring in passive optical network using code division multiplex-based dual-OTDR traces comparison

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