Abstract
A modified phase generation carrier technique used in fiber-optic distributed disturbance sensor (FDDS) is proposed and investigated. The FDDS locates the disturbance by dual Mach–Zehnder (MZ) interferometers, however, the initializing phase error of the two MZ interferometer causes the location errors. For the modified PGC technique, a narrow band analog low pass filter is designed, which solves the problem of facilitating the digital narrow band low pass filter in high speed A/D acquisition. In addition, a special demodulation signal is proposed to demodulate higher-order harmonic, compensate the time delay of the long optical fiber and enhance the signal to noise ratio. It is found that the location errors caused by phase drift can be eliminated in our experiments.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.