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A DFB Fiber Laser Sensor System with Ultra-High Resolution and Its Noise Analysis |
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| Authors: | Hao Xiao Fang Li Jun He Yu-Liang Liu |
| Affiliation: | 1. Optoelectric System Laboratory, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China;Sifang Electrics Group Co., LTD, Beijing,100084, China 2. Optoelectric System Laboratory, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China |
| Abstract: | A distributed feedback fiber laser (DFB FL) sensor system with ultra-high resolution is described. The sensor is made by writing distributed feedback structures into a high gain active fiber, and the system employs an unbalanced Michelson interferometer to translate laser wavelength shifts induced by weak measurands into phase shifts. A digital phase generated carrier demodulation scheme is introduced to achieve ultra-high resolution interrogation. A detailed noise analysis of the system is presented, and it is shown that the system resolution is limited by the frequency noise of the DFB FL. |
| Keywords: | Distributed feedback fiber sensor system fiber sensor interferometer noise analysis phase generated carrier |
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