Abstract
A novel interrogation system for large scale sensing network with identical ultra-weak fiber Bragg
gratings (FBG) is proposed, theoretically analyzed and experimentally studied. Based on time-division multiplexing
(TDM) technique, two semiconductor optical amplifiers are introduced to the interrogation system to achieve fast and
flexible demodulation. A simulation depending on the formula of reflected pulse spectra, derived by analyzing the
source of disturbance along the optical path, is processed for evaluating the performance theoretically. Experiment
was demonstrated on an 843 serial FBGs sensor network, with a peak reflectivity of −40 to −45 dB and
a spatial resolution of 2 m along a single optical fiber by launching a 50 kHz scanning frequency with
20 ns effective pulse width to the system. Due to the low crosstalk, it is possible to integrate several
thousands of FBG sensors in a single optical fiber.
© 2014 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