Noise induced in optical fibers by double Rayleigh scattering of a laser with a 1/fν frequency noise

Michael Fleyer, Seth Heerschap, Geoffrey A. Cranch, Moshe Horowitz

Research output: Contribution to journalArticlepeer-review

Abstract

We study, theoretically and experimentally, intensity noise induced by double Rayleigh scattering in long optical fibers. The results of the theoretical model are compared to experimental results performed with a high-coherencelength laser with a frequency noise spectrum that is dominated by 1/fν noise. Excellent quantitative agreement between theoretical and experimental RF spectra were obtained for frequencies as low as 10 Hz and for fiber lengths between 4 and 45 km. Strong low-frequency intensity noise that is induced by 1/fν frequency noise of the laser may limit the performance of interferometric fiber optic sensors that require high-coherence-length lasers. The intensity noise due to double Rayleigh backscattering can be suppressed by reducing the coherence length of the laser. Therefore, the intensity noise has a complex and nonmonotonic dependence on the 1/fν frequency noise amplitude of the laser. Stimulated Brillouin scattering will add a significant noise for input powers greater than about 7 mW for a 30 km length fiber.

Original languageEnglish
Pages (from-to)1265-1268
Number of pages4
JournalOptics Letters
Volume41
Issue number6
DOIs
StatePublished - 15 Mar 2016

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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