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Extended-range FMCW reflectometry using an optical loop with a frequency shifter
- Source :
- IEEE Photonics Technology Letters. 8(2):248-250
- Publication Year :
- 1996
- Publisher :
- IEEE, 1996.
-
Abstract
- 金沢大学工学部<br />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 fFS Hz) is incorporated in the reference arm of the reflectometry. As a result, the interference signal corresponding to the reference beam that circulates N rounds in the loop appears around (N × fFS) 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.
- Subjects :
- Optical path difference
Refractive index
Frequency modulated continuous wave reflectometry
Spectrum analyzers
Optical modulation amplitude
Signal
Waveguide (optics)
Optics
Bandwidth
Interference (communication)
Frequency domain analysis
Frequency modulation
Optical fibers
Electrical and Electronic Engineering
Reflectometry
Optical fiber loop
Physics
Semiconductor lasers
business.industry
Distributed feedback lasers
Frequency shifter
Acoustooptical modulator
Atomic and Molecular Physics, and Optics
Electronic, Optical and Magnetic Materials
Time-domain reflectometry
Reference beam
Signal interference
Optical variables measurement
business
Subjects
Details
- Language :
- English
- ISSN :
- 10411135
- Volume :
- 8
- Issue :
- 2
- Database :
- OpenAIRE
- Journal :
- IEEE Photonics Technology Letters
- Accession number :
- edsair.doi.dedup.....36bbef1c0c44e4e5d1463f7b8f6de409