1987
DOI: 10.1109/jlt.1987.1075523
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Development of a coherent OTDR instrument

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Cited by 79 publications
(26 citation statements)
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“…1. Since conventional C-OTDR is based on a singlefrequency probe, it only obtains one intermediate frequency (IF) by coherent detection [3] . In this letter, we use a phase modulator (PM) to convert a single-frequency probe to multiple frequencies and keep the local oscillator (LO) as the original single frequency.…”
Section: Coherent Optical Time Domain Reflectometry (C-otdr)mentioning
confidence: 99%
“…1. Since conventional C-OTDR is based on a singlefrequency probe, it only obtains one intermediate frequency (IF) by coherent detection [3] . In this letter, we use a phase modulator (PM) to convert a single-frequency probe to multiple frequencies and keep the local oscillator (LO) as the original single frequency.…”
Section: Coherent Optical Time Domain Reflectometry (C-otdr)mentioning
confidence: 99%
“…5 (the red line). As noise obeys statistic theory, averaging the results of a large number of measurements can reduce noise level of OTDR trace, which improves measurement DR [2]- [4]. The DR enhancement can be expressed as,…”
Section: Principle Of the Tdm-otdrmentioning
confidence: 99%
“…The measurement DR is strongly dependent on averaging the results of a large number of measurements [2]- [6]. For quickly increasing measurement number, an M-ary frequency shift keying (FSK) probe method was proposed [3].…”
Section: Introductionmentioning
confidence: 99%
“…Also, in most optical diagnostic techniques such as coherent reflectometry, the phase error characteristics of laser sources restrict such performance characteristics as detection sensitivity and measurement range. In time domain coherent reflectometry [2], the probe pulse should be coherent within the pulse width, whereas coherent frequency domain reflectometry needs a coherent probe beam over the measurement range to achieve its inherent resolution [3], unless a particular phase noise compensation technique is adopted [4]. These approaches are analogous to Doppler lidar systems, which use coherent detection to observe optical frequency variation [5].…”
Section: Introductionmentioning
confidence: 99%