Abstract
We demonstrate a high-performance Brillouin optical time-domain analysis (BOTDA)
system with an extended sensing range by combining frequency-division multiplexing and
in-line Erbium doped fiber amplifiers (EDFAs). The frequency-division multiplexing BOTDA
features multiple sections of fibers with different Brillouin frequency shifts, and it
reduces the effective Brillouin interaction length to one resonant Brillouin frequency
section rather than the entire length of the sensing fiber, so that the power of CW
probe of BOTDA can be increased to enhance the Brillouin signal within individual
sections and consequently extend the sensing range combined with high strain or
temperature resolution with negligible pump depletion. In addition, in-line EDFAs placed
between spans are used to compensate the fiber loss for similar Brillouin gains in each
span. In experiment, a 150-km sensing range is achieved by dividing the sensing fibers
into two spans of equal length and using two types of fibers in each span. Using the
differential pulse-width pair technique, a 100/120 ns pulse pair is used to realize a
2-m spatial resolution and a measurement accuracy of 1.5°C/30 με
at the end of the sensing fibers.
© 2011 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription