Long-distance fiber sensor system based on the second-order Raman pump and amplification

• DOI: 10.1007/s00340-012-5112-8
• Publication Date: 2012-07-22T03:08:18Z
• Authors: B. Dong; J. Hu; Z. Chen; C. Yu
• Keywords: 0103 physical sciences; 500; 530; 01 natural sciences

We demonstrate a novel technique to realize a long-distance fiber sensor system based on the second-order Raman pump and amplification. With the second-order Raman pump and amplification, a gain spectrum around 1582-nm is achieved. It serves as not only the optical source for the remote fiber sensor but also the filter to intensity modulated the wavelength shift of the fiber sensor. A long-distance fiber strain sensor system is demonstrated by adopting a fiber Fabry–Perot sensor. Experimental results show that the wavelength shift of the sensor in response to the strain is simultaneously intensity modulated by the steep slope with a high sensitivity, while it is temperature insensitive. With the side gain spectrum served as a quasi-linear filter, the sensor can also be quasi-linearly intensity-modulated.