Journal
IEEE PHOTONICS JOURNAL
Volume 6, Issue 4, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOT.2014.2332454
Keywords
Strain sensors; fiber lasers; in-line Mach-Zehnder interferometer; fiber optics systems
Funding
- National Natural Science Foundation of China [11274224]
- Shanghai Shuguang Program [10SG38]
- State Key Laboratory Advanced Optical Communication System and Networks, Shanghai Jiaotong University [2013GZKF031307]
- Shanghai Institutions of Higher Learning
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We experimentally demonstrated a strain sensor based on fiber ring cavity laser with a photonic crystal fiber (PCF) in-line Mach-Zehnder interferometer (MZI) structure, which is used as an optical band-pass filter and acts as the strain sensing component. The fiber ring cavity laser plays the role of enhancing the visibility of the resonant spectrum and narrowing the corresponding 3-dB bandwidth, thus improving the comprehensive sensing performance. The induced axial strain on the structure is measured by monitoring the central wavelengths of the laser output. A high strain sensing sensitivity of 2.1 pm/ mu epsilon is successfully achieved in the linear strain range of 0-2100 mu epsilon. A parameter Q value describing the overall sensing performance is introduced by including the strain sensing sensitivity, sensing sensitivity relative to 3-dB bandwidth of the resonant spectrum and the corresponding visibility. Comparing with the reported strain measurements based on a PCF in-line MZI structure, the experimental results based on fiber ring cavity laser sensor present more than nine times larger Q value.
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