外文题目: Observation of fundamental thermal noise in optical fibers down to infrasonic frequencies
作者: Dong, Jing; Huang, Junchao; Li, Tang; Liu, Liang
刊名: Appl. Phys. Lett.
年: 2016 卷: 108 期: 2 文章编号：21108
英文关键词:

PHASE NOISE; INTERFEROMETERS; FLUCTUATIONS; LASERS; DISSIPATION; FEEDBACK; SAGNAC; LIMIT
英文摘要:
The intrinsic thermal noise in optical fibers represents the ultimate limit for fiber-based systems. However, at infrasonic frequencies, the spectral behavior of the intrinsic thermal noise is still unclear. In this letter, we present measurements of the fundamental thermal noise in optical fibers that are obtained using a balanced fiber Michelson interferometer. When an ultra-stable laser is used as the laser source and other noise sources are carefully controlled, the 1/f spectral density of the thermal noise is observed down to infrasonic frequencies, and the measured magnitude is consistent with the results of theoretical predictions at frequencies over the range from 0.2 Hz to 20 kHz. Moreover, as observed experimentally, the level of the 1/f thermal noise can be reduced by changing the coatings of the optical fibers. This therefore indicates one possible way to reduce thermal noise in optical fibers at low Fourier frequencies. Finally, the inconsistency between the experimental data and the existing theory for thermomechanical noise is discussed. (C) 2016 AIP Publishing LLC.


文献类型: 期刊论文
正文语种: English
收录类别: SCIEI
DOI: 10.1063/1.4939918


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