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Optica Publishing Group
  • Optical Fiber Sensors
  • Collected Papers of the International Conferences on Optical Fiber Sensors 1983-1997 (Optica Publishing Group, 1992),
  • paper P38
  • https://doi.org/10.1364/OFS.1992.P38

Spurious Sidebands Of Signal Carriers In Fiber-optic Interferometric Sensors

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Abstract

Baseband low-frequency signals up-converted to sidebands of signal carriers can mask out the detection of intended signals[1]. For example, laser source intensity noise up-converted to the sideband of the magnetic carrier can limit the detection of small low-frequency magnetic signals[2]. In this paper, we present experimental results which demonstrate the up-conversion of three types of baseband signals: 1) the interferometer optical input intensity fluctuation from laser intensity noise, 2) the frequency noise of the optical source or equivalent low-frequency interferometer phase noise, and 3) the input polarization fluctuation. Also, the dependence of the strength of these up-converted signals on the interferometer quadrature condition and on the frequency contents of these baseband signals are presented.

© 1992 Optical Society of America

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