Proceedings ArticleDOI
Ultra high dynamic range coherent optical time domain reflectometry employing frequency division multiplexing
Hiroyuki Iida,Yusuke Koshikiya,Fumihiko Ito,Kuniaki Tanaka +3 more
- Vol. 7753, pp 540-543
TLDR
This paper presents coherent OTDR employing frequency division multiplexing and frequency demultiplexing by software processing, and achieves a 100-dB dynamic range with 218 measurements at a 1-km spatial resolution.Abstract:
We present coherent OTDR employing frequency division multiplexing and frequency demultiplexing by software
processing. We improved a 5-dB dynamic range against conventional coherent OTDR, and achieved a 100-dB dynamic
range with 218 measurements at a 1-km spatial resolution.read more
Citations
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Journal ArticleDOI
High-Sensitivity Coherent Optical Time Domain Reflectometry Employing Frequency-Division Multiplexing
TL;DR: The detection sensitivity performance with the proposed parallel detection scheme, operating at 40 frequency-division multiplexing, was improved by about 8 dB compared with the conventional method, and the 3 dB resolution and Rayleigh dead zone of conventional C-OTDR and the proposed method were almost the same at a spatial resolution of 1 km.
Journal ArticleDOI
Recent Progress in the Performance Enhancement of Phase-Sensitive OTDR Vibration Sensing Systems
TL;DR: Progress in different areas of their performance evaluation factors such as improvement of the signal-to-noise ratio (SNR), spatial resolution (SR) in the sub-meter range, enlargement of the sensing range, increased frequency response bandwidth over the conventional limits, phase signal demodulation and chirped-pulse Φ-OTDR for quantitative measurement have been realized.
Journal ArticleDOI
Frequency division multiplexing OTDR with fast signal processing
TL;DR: In this article, a frequency division multiplexing optical time domain reflectometry (FDM-OTDR) is proposed and experimentally demonstrated, where a phase modulator is employed to convert single frequency laser to multiple frequencies where four frequencies are adopted as the probe.
Journal ArticleDOI
Coherent optical time domain reflectometry using three frequency multiplexing probe
TL;DR: In this paper, a multi-frequency probe based coherent optical time domain reflectometry (MFP C-OTDR) scheme was proposed, where the local oscillator remains original single frequency.
References
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Journal ArticleDOI
Instrumentation principles for optical time domain reflectometry
TL;DR: Optical time domain reflectometry (OTDR) is the only fiber measurement technique which allows anomalously lossy sections of fibre and other defects to be located nondestructively from one end of the fibre as mentioned in this paper.
Journal ArticleDOI
Stochastic amplitude fluctuation in coherent OTDR and a new technique for its reduction by stimulating synchronous optical frequency hopping
TL;DR: In this paper, a stochastic description of the amplitude fluctuation using probability density functions and calculated amplitude fluctuations with M integrations when reduction techniques are applied was provided. But the amplitude fluctuations were not considered in this paper.
Journal ArticleDOI
Optimization of SNR improvement in the noncoherent OTDR based on simplex codes
TL;DR: In this article, simplex codes (scs) were used to improve the signal-to-noise ratio (SNR) of an optical time-domain reflectometer (OTDR) for the first time.
Journal ArticleDOI
The performance limit of coherent OTDR enhanced with optical fiber amplifiers due to optical nonlinear phenomena
TL;DR: In this paper, the authors theoretically and experimentally clarified the limit of incident optical pulse power in coherent optical time-domain reflectometry (C-OTDR) enhanced with optical fiber amplifiers.
Journal ArticleDOI
High-accurate fault location technology using FSK-ASK probe backscattering reflectometry in optical amplifier submarine transmission systems
TL;DR: In this article, the authors proposed a new modulation format for optical time domain reflectometry (OTDR) to eliminate optical surge and improve OTDR performance in optical amplifier submarine transmission systems.