Noise induced in optical fibers by double Rayleigh scattering of a laser with a 1/f^ν frequency noise
| Autor: | Geoffrey A. Cranch, Michael Fleyer, Seth Heerschap, Moshe Horowitz |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Physics
Optical fiber business.industry Relative intensity noise Noise spectral density Physics::Optics 02 engineering and technology Laser 01 natural sciences Atomic and Molecular Physics and Optics law.invention 010309 optics symbols.namesake 020210 optoelectronics & photonics Optics law Brillouin scattering 0103 physical sciences Phase noise 0202 electrical engineering electronic engineering information engineering symbols Rayleigh scattering business Noise (radio) |
| Zdroj: | Optics Letters. 41:1265 |
| ISSN: | 1539-4794 0146-9592 |
| DOI: | 10.1364/ol.41.001265 |
| Popis: | 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-coherence-length 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 non-monotonic 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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