Abstract
In this paper, a novel method for Brillouin optical time-domain
analyzers exploiting the gain spectrum engineering will be proposed for
the first time, to the best of our knowledge. By superimposing the
Brillouin gain with two symmetric loss spectra, new degrees of freedom
will be provided to engineer the spectrum of the Brillouin interaction.
This leads to a Brillouin gain shape which is much more robust to noise
influences than the conventional one. Simulations and experiment are in
very good agreement to each other and demonstrate a more than 3-dB
measurement accuracy enhancement. Since for the proposed method the
frequency error is less susceptible to the fiber loss, the sensing range
can be extended by up to 60%. This paper might open a new way to enhance
and adapt the distributed Brillouin sensing performances by an engineering
of the spectrum shape.
© 2019 IEEE
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