Extended-range FMCW reflectometry using an optical loop with a frequency shifter

We propose a novel method to extend the measurement range of FMCW reflectometry. In this method, an optical loop with a frequency shifter (working frequency f/sub FS/Hz) is incorporated in the reference arm of the reflectometry. As a result, the interference signal corresponding to the reference bea...

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Bibliographic Details
Published inIEEE photonics technology letters Vol. 8; no. 2; pp. 248 - 250
Main Authors Xiao-Qun Zhou, Iiyama, K., Hayashi, K.
Format Journal Article
LanguageEnglish
Published IEEE 01.02.1996
Subjects
Fiber lasers
Frequency locked loops
Interference
Optical devices
Optical fibers
Optical interferometry
Optical modulation
Optical refraction
Optical variables control
Reflectometry
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Summary:We propose a novel method to extend the measurement range of FMCW reflectometry. In this method, an optical loop with a frequency shifter (working frequency f/sub FS/Hz) is incorporated in the reference arm of the reflectometry. As a result, the interference signal corresponding to the reference beam that circulates N found in the loop appears around (N/spl times/f/sub FS/) Hz, which means that the signals from different measurement ranges can be detected in different frequency domains. Therefore, it is possible to extend the measurement range. In the experiment, the measurement range is extended from 15 m to 48 m.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1041-1135
1941-0174
DOI:10.1109/68.484256