Refractive Index Sensing Based on Chaotic Correlation Fiber Loop Ring down System Using Tapered Fiber

Jun Tian, Lingzhen Yang*, Chong Qin, Tianlong Wu, Juanfen Wang, Zhaoxia Zhang, Kang Li, Nigel Joseph Copner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


A novel refractive index sensing using the tapered single mode fiber (TSMF) is proposed based on the chaotic correlation fiber loop ring down system (FLRDs). A chaotic fiber laser is used to drive the fiber loop cavity. The performance of the proposed TSMF chaotic correlation FLRDs refractive index sensing was demonstrated by measuring the ring down time of the peaks of correlation coefficient of the sensing system at different refractive index. The sensing demonstrates a good stability and repeatability. The influence of the change in fiber loop length on the sensing system was also investigated. The results show that the sensitivity of chaotic correlation FLRDs increases with the decrease of the loop length and the change of the loop length has little effect on the detection limit (DL) of the system. The DL of 10-4 RIU were achieved. Compared with the pulsed FLRDs, the chaotic correlation FLRDs significantly simplify the light source of sensing system and eliminate the trade-off problem between the length of fiber loop cavity and the light source, and makes fiber loop length more flexible.

Original languageEnglish
Article number8939448
Pages (from-to)4215-4220
Number of pages6
JournalIEEE Sensors Journal
Issue number8
Publication statusPublished - 15 Apr 2020
Externally publishedYes


  • Chaotic fiber laser
  • fiber loop ring down
  • refractive index sensing


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