AI Article Synopsis
- Researchers are exploring distributed amplification methods in optical fiber sensors to enhance measurement range while mitigating fiber loss and nonlinear effects.
- Recent advancements show that using Raman amplification with specially designed intensity modulation can create a nearly lossless signal from one end of the fiber.
- The study combines this method with second order Raman pumping, achieving a detection range of 70 km, significantly improving sensitivity and reducing noise compared to standard techniques.
Article Abstract
In distributed optical fibre sensors, distributed amplification schemes have been investigated in order to increase the measurement range while avoiding the limitation imposed by the fibre attenuation and the nonlinear effects. Recently, the use of Raman amplification with an engineered intensity modulation has been demonstrated as an efficient way to produce a virtually lossless trace employing a single-end configuration. In this paper, we propose the combination of this technique with a simultaneous second order Raman pumping scheme for increasing the measurement range. The optimal modulation profile has been numerically analyzed and we experimentally demonstrate a sensor able to detect perturbations along 70 km of fibre, with a minimal SNR penalty along the total length. Thanks to this new approach, the sensitivity in the worst point is considerably improved, and the ASD noise floor is also reduced. The measurement range is extended approximately 15 km compared with the equivalent first order pumping case.
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| http://dx.doi.org/10.1364/OE.440514 | DOI Listing |
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