Beat Noise Reduction by Fast Optical Switching in Brillouin Grating-Based FMCW Reflectometry
| Autor: | Shin-ichi Satoh, Kazumasa Takada, Takahiro Yasuno |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
Optical amplifier Optical fiber business.industry 02 engineering and technology Optical modulation amplitude 01 natural sciences Waveguide (optics) Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention 010309 optics Brillouin zone 020210 optoelectronics & photonics Optics Brillouin scattering law Fiber optic sensor 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Optoelectronics Electrical and Electronic Engineering business Reflectometry |
| Zdroj: | IEEE Photonics Technology Letters. 29:1078-1081 |
| ISSN: | 1941-0174 1041-1135 |
| Popis: | We demonstrated an optical switching method for deriving a Brillouin reflectogram from a 1-m-long optical fiber without the use of a polarization diversity technique or a least-squares procedure in coherent frequency-modulated continuous wave reflectometry. We reduced the intrinsic beat noise by blocking one pump light from entering the balanced mixer for $120~\mu \text{s}$ with an acousto-optic modulator while sweeping the laser wavelength at a rate of 0.5 nm/s. The variations in the derived reflectograms at the center of the Brillouin spectrum were within ±14 %, and these were governed mainly by the multiplicative noise. |
| Databáze: | OpenAIRE |
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