Abstract
A technique is proposed to interrogate a distributed photonic sensor composed of seven standard fiber Bragg gratings in cascade. A microwave-modulated optical signal is launched into an FBG cascade and subsequently undergoes dispersion in standard single-mode fiber, so that the different Bragg wavelengths are mapped into the radio-frequency (RF) delays that determine the peaks in the electrical impulse response of the optical link. Shifts in Bragg wavelengths have been determined from the shifts in the impulse response's peaks by recording the link's RF response in the range dc-20 GHz using a vector network analyzer (VNA), and then performing its inverse Fourier transform. A resolution of 14 pm is experimentally demonstrated after zero-padding the VNA traces.
© 2015 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