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A kind of optical fiber liquid refractive index sensor is proposed based on fiber core etched air-bubble and core diameter mismatched in-fiber Mach-Zehnder interferometer. A core etched standard single-mode fiber is spliced to another core etched standard single-mode fiber (SMF) to form an air bubble at the connecting point, and a 20 mm thinned fiber is cascaded (TCF) by fusion splicing method, which is 20 mm apart from the bubble, then a leading-mode fiber is spliced to the thinned fiber to form a structure of SMF-(air-bubble)-SMF-TCF-SMF in-fiber Mach-Zehnder interferometer liquid refractive index sensor. The air-bubble and the two fiber core diameter mismatched points serve as optical couplers for modes conversion. The transmission spectrum of sensor is studied by experiment. Results shows that the peak power changes with respect to surrounding refractive index with good linearity. The sensitivity of the sensor is 142.537 dB/RIU in the range of 1.3511.402 with linearity of 0.996, making it a good candidate for bio-chemical measurements.
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Keywords:
- in-fiber air bubble /
- core diameter mismatch /
- in-fiber Mach-Zehnder interferometer /
- refractive index sensing
[1] Tian Z B, Yam S S H, Loock H P 2008 Optics letters 33 1105
[2] Gong Y, Guo Y, Rao Y J, Zhao T, Wu Y, Ran Z L 2011 ActaPhys. Sin. 60 064202 (in Chinese) [龚元, 郭宇, 饶云江, 赵天, 吴宇, 冉曾令 2011 60 064202]
[3] Nguyen L V, Vasiliev M, Alameh K 2011 IEEE Photonics Technology Letters 23 450
[4] Yin Z H, Zhang X B, Liu Y Q, Pang F F, Wang T Y 2012 APC Technical Digest OSA: AF4A.72.pdf
[5] Rindorf L H, Jensen J B, Dufva H M 2006 Optics Express 14 8224
[6] Fan Y, Zhu T, Shi L 2011 Applied Optics 50 4604
[7] Cao Y, Yang Y F, Yang X F, Tong Z R 2012 Chinese Optics Letters 10 030605
[8] Liang R B, Sun Q Z, Wo J H, Liu D M 2011 ActaPhys.Sin.60 104221 (in Chinese) [梁瑞冰, 孙琪真, 沃江海, 刘德明 2011 60 104221]
[9] Reeves R, Webb D J, Bennion I, Neal R 2002 Review of Scientific Instruments 73 1702
[10] Tian Z B, Yam S S H, Barnes J, Bock W 2008 IEEE Photonics Technology Letters 20 626
[11] Xia T H, Zhang A P, Gu B B, Zhu J J 2010 Optics Communications 283 2136
[12] Li L C, Xia L, Xie Z H, Liu D M 2012 Optics Express 20 11109
[13] Rong Q Z, Qiao X G, Wang R H, Sun H, Hu M L, Feng Z Y 2012 IEEE Sensors Journal12 2501
[14] Qiu S J, Chen Y, Kou J L, Xu F, Lu Y Q 2011 Applied Optics 50 4328
[15] Ma Y, Qiao X G, Guo T, Wang R H, Zhang J, Weng Y Y, Feng Z Y 2012 Optics Letters 37 323
[16] Guo Y 2010 MS Dissertation (chengdu: University of Electronic Science And Technology of China) (in Chinese) [郭宇 2010 硕士学位论文 (成都: 电子科技大学)]
[17] Villatoro J, Monzón-Hernández D, 2006 IEEE. Journal of Lightwave Technology 24 1409
[18] Harris J, Lu P, Larocque H, Xu Y P, Chen L, Bao X Y 2013 Optics Express 21 9996
[19] Zhu J J, Zhang A P, Xia T H, He S L, Xue W 2010 IEEE Sensors Journal 10 1415
[20] Pang F F, Liu H H, Guo H R, Liu Y Q, Zeng X L, Chen N, Chen Z Y, Wang T Y 2011 IEEE Sensors Journal 11 2395
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[1] Tian Z B, Yam S S H, Loock H P 2008 Optics letters 33 1105
[2] Gong Y, Guo Y, Rao Y J, Zhao T, Wu Y, Ran Z L 2011 ActaPhys. Sin. 60 064202 (in Chinese) [龚元, 郭宇, 饶云江, 赵天, 吴宇, 冉曾令 2011 60 064202]
[3] Nguyen L V, Vasiliev M, Alameh K 2011 IEEE Photonics Technology Letters 23 450
[4] Yin Z H, Zhang X B, Liu Y Q, Pang F F, Wang T Y 2012 APC Technical Digest OSA: AF4A.72.pdf
[5] Rindorf L H, Jensen J B, Dufva H M 2006 Optics Express 14 8224
[6] Fan Y, Zhu T, Shi L 2011 Applied Optics 50 4604
[7] Cao Y, Yang Y F, Yang X F, Tong Z R 2012 Chinese Optics Letters 10 030605
[8] Liang R B, Sun Q Z, Wo J H, Liu D M 2011 ActaPhys.Sin.60 104221 (in Chinese) [梁瑞冰, 孙琪真, 沃江海, 刘德明 2011 60 104221]
[9] Reeves R, Webb D J, Bennion I, Neal R 2002 Review of Scientific Instruments 73 1702
[10] Tian Z B, Yam S S H, Barnes J, Bock W 2008 IEEE Photonics Technology Letters 20 626
[11] Xia T H, Zhang A P, Gu B B, Zhu J J 2010 Optics Communications 283 2136
[12] Li L C, Xia L, Xie Z H, Liu D M 2012 Optics Express 20 11109
[13] Rong Q Z, Qiao X G, Wang R H, Sun H, Hu M L, Feng Z Y 2012 IEEE Sensors Journal12 2501
[14] Qiu S J, Chen Y, Kou J L, Xu F, Lu Y Q 2011 Applied Optics 50 4328
[15] Ma Y, Qiao X G, Guo T, Wang R H, Zhang J, Weng Y Y, Feng Z Y 2012 Optics Letters 37 323
[16] Guo Y 2010 MS Dissertation (chengdu: University of Electronic Science And Technology of China) (in Chinese) [郭宇 2010 硕士学位论文 (成都: 电子科技大学)]
[17] Villatoro J, Monzón-Hernández D, 2006 IEEE. Journal of Lightwave Technology 24 1409
[18] Harris J, Lu P, Larocque H, Xu Y P, Chen L, Bao X Y 2013 Optics Express 21 9996
[19] Zhu J J, Zhang A P, Xia T H, He S L, Xue W 2010 IEEE Sensors Journal 10 1415
[20] Pang F F, Liu H H, Guo H R, Liu Y Q, Zeng X L, Chen N, Chen Z Y, Wang T Y 2011 IEEE Sensors Journal 11 2395
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