Effect of Laser Polarization on Fiber Bragg Grating Fabry-Perot Interferometer for Ultrasound Detection
High-finesse fiber Bragg gratings (FBGs) Fabry-Perot interferometers (FPIs) have shown great promise as sensitive ultrasonic sensors. However, the fabrication process of the sensors usually introduces birefringence to the fiber, which makes the sensor operation sensitive to the polarization of the p...
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IEEE
2020-01-01
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| Online Access: | https://ieeexplore.ieee.org/document/9140365/ |
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| author | Yupeng Zhu Qiwen Sheng Ming Han |
| author_facet | Yupeng Zhu Qiwen Sheng Ming Han |
| author_sort | Yupeng Zhu |
| collection | DOAJ |
| description | High-finesse fiber Bragg gratings (FBGs) Fabry-Perot interferometers (FPIs) have shown great promise as sensitive ultrasonic sensors. However, the fabrication process of the sensors usually introduces birefringence to the fiber, which makes the sensor operation sensitive to the polarization of the probe laser. Here, we theoretically study the effect of laser polarization on the sensitivity of the sensor with birefringence. We show that, to maintain the sensitivity above half of its maximum of a high-finesse FBG-FPI sensor, the spectral notch separation caused by sensor birefringence should be less than ∼61% of the spectral notch width of the sensor. We fabricate an FBG-FPI sensor with negligible overall birefringence by rotating the fiber by 90° between the fabrication of the two FBGs. As a result, the birefringence introduced during the fabrication of the two FBGs cancels out each other. For comparison, a regular FBG-FPI fabricated without fiber rotation was also tested. While the regular FBG-FPI exhibited large variations in detection sensitivity with laser polarization, the polarization-insensitive showed little changes. As a result, no control on the laser polarization is needed during the operation of the polarization-insensitive FBG-FPI for ultrasonic detection, an important attribute required in many practical applications of the sensor. |
| format | Article |
| id | doaj-art-e0ca3e6850604badad9c54c68917a3f6 |
| institution | OA Journals |
| issn | 1943-0655 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj-art-e0ca3e6850604badad9c54c68917a3f62025-08-20T02:38:36ZengIEEEIEEE Photonics Journal1943-06552020-01-011241810.1109/JPHOT.2020.30090629140365Effect of Laser Polarization on Fiber Bragg Grating Fabry-Perot Interferometer for Ultrasound DetectionYupeng Zhu0https://orcid.org/0000-0002-6260-5238Qiwen Sheng1https://orcid.org/0000-0001-5039-3998Ming Han2https://orcid.org/0000-0003-3595-4560Department of Electrical and Computer Engineering, Michigan State University, East Lansing, MI, USADepartment of Electrical and Computer Engineering, Michigan State University, East Lansing, MI, USADepartment of Electrical and Computer Engineering, Michigan State University, East Lansing, MI, USAHigh-finesse fiber Bragg gratings (FBGs) Fabry-Perot interferometers (FPIs) have shown great promise as sensitive ultrasonic sensors. However, the fabrication process of the sensors usually introduces birefringence to the fiber, which makes the sensor operation sensitive to the polarization of the probe laser. Here, we theoretically study the effect of laser polarization on the sensitivity of the sensor with birefringence. We show that, to maintain the sensitivity above half of its maximum of a high-finesse FBG-FPI sensor, the spectral notch separation caused by sensor birefringence should be less than ∼61% of the spectral notch width of the sensor. We fabricate an FBG-FPI sensor with negligible overall birefringence by rotating the fiber by 90° between the fabrication of the two FBGs. As a result, the birefringence introduced during the fabrication of the two FBGs cancels out each other. For comparison, a regular FBG-FPI fabricated without fiber rotation was also tested. While the regular FBG-FPI exhibited large variations in detection sensitivity with laser polarization, the polarization-insensitive showed little changes. As a result, no control on the laser polarization is needed during the operation of the polarization-insensitive FBG-FPI for ultrasonic detection, an important attribute required in many practical applications of the sensor.https://ieeexplore.ieee.org/document/9140365/Fiber optic sensorsfiber Bragg gratingspolarizationbirefringenceultrasound detection |
| spellingShingle | Yupeng Zhu Qiwen Sheng Ming Han Effect of Laser Polarization on Fiber Bragg Grating Fabry-Perot Interferometer for Ultrasound Detection IEEE Photonics Journal Fiber optic sensors fiber Bragg gratings polarization birefringence ultrasound detection |
| title | Effect of Laser Polarization on Fiber Bragg Grating Fabry-Perot Interferometer for Ultrasound Detection |
| title_full | Effect of Laser Polarization on Fiber Bragg Grating Fabry-Perot Interferometer for Ultrasound Detection |
| title_fullStr | Effect of Laser Polarization on Fiber Bragg Grating Fabry-Perot Interferometer for Ultrasound Detection |
| title_full_unstemmed | Effect of Laser Polarization on Fiber Bragg Grating Fabry-Perot Interferometer for Ultrasound Detection |
| title_short | Effect of Laser Polarization on Fiber Bragg Grating Fabry-Perot Interferometer for Ultrasound Detection |
| title_sort | effect of laser polarization on fiber bragg grating fabry perot interferometer for ultrasound detection |
| topic | Fiber optic sensors fiber Bragg gratings polarization birefringence ultrasound detection |
| url | https://ieeexplore.ieee.org/document/9140365/ |
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