Journal
QUANTUM ELECTRONICS
Volume 49, Issue 12, Pages 1121-1126Publisher
TURPION LTD
DOI: 10.1070/QEL17165
Keywords
coherent optical frequency-domain reflectometer; self-scanning fibre laser; tunable laser; fibre sensor; reflectometry
Funding
- Russian Foundation for Basic Research [18-32-00563, 0254-2019-0001]
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The first results of an experimental study of a coherent optical frequency-domain reflectometer (C-OFDR) based on a simple single-frequency fibre laser with frequency self-scanning are presented. The self-scanning laser generates microsecond pulses, and its lasing frequency changes linearly with a change in the pulse number without using any actively tuned elements. In addition, the generation of each pulse occurs on only one longitudinal mode with a linewidth less than 1 MHz. This laser is characterised by a high linearity of frequency tuning, due to which reflectograms can be measured without any additional spectral correction. The C-OFDR demonstrates a possibility of attaining a spatial sampling of similar to 200 mu m and a reflectance sensitivity of approximately down to -80 dB at a test line length of similar to 9 m.
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