Photonics sensing at the thermodynamic limit

Optics Letters
George SkolianosMichel J F Digonnet

Abstract

We report a slow-light fiber Bragg grating strain sensor with a resolution limited by the extremely low thermodynamic phase fluctuations of the fiber. This was accomplished by using a short grating (4.5 mm) to enhance the thermal phase noise, an ultra-stable interrogation laser to lower the laser frequency noise, and a slow-light mode with a high group index (∼533) to suppress all other noise sources. We demonstrate that in a similar but longer grating (21 mm), the phase noise is suppressed in inverse proportion to the square root of the length, in accordance with theory, leading to a strain resolution as low as 130  fε/√Hz and a minimum detectable length of ∼3×10<sup>-15</sup>  m at 1.5 kHz.

References

Aug 12, 2005·Optics Letters·Jong H ChowIan C M Littler
Oct 30, 2010·Science·G GagliardiP De Natale
Mar 16, 2011·Optics Letters·G A Cranch, G A Miller
Jan 24, 2012·Science·Geoffrey A Cranch, Scott Foster
Feb 25, 2014·Optics Letters·Jeremy UphamRobert W Boyd
Jul 1, 2014·Optics Letters·George SkolianosMichel J F Digonnet
Aug 11, 2015·Optics Letters·George SkolianosMichel J F Digonnet

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Citations

Nov 4, 2017·Sensors·Joé HabelMartin Bernier
May 15, 2020·Optics Express·Shuaije MiaoWenzhu Huang
Jun 2, 2020·Optics Letters·Pierre-Baptiste VigneronMichel J F Digonnet

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