Low detection limit refractive index sensor based on open microcavity Mach-Zehnder interferometer and fiber ring laser

Panpan Niu; Junfeng Jiang; Kun Liu; Shuang Wang; Zhe Ma; Yongning Zhang; Wenjie Chen; Tong Wang; Tiegen Liu

doi:10.1117/12.2575029

10 October 2020 Low detection limit refractive index sensor based on open microcavity Mach-Zehnder interferometer and fiber ring laser

Panpan Niu, Junfeng Jiang, Kun Liu, Shuang Wang, Zhe Ma, Yongning Zhang, Wenjie Chen, Tong Wang, Tiegen Liu

Author Affiliations +

Proceedings Volume 11554, Advanced Sensor Systems and Applications X; 115540D (2020) https://doi.org/10.1117/12.2575029
Event: SPIE/COS Photonics Asia, 2020, Online Only

Abstract

An optical fiber refractive index (RI) sensor based on open microcavity Mach-Zehnder interferometer (OMZI) and fiber ring laser (FRL) is proposed and demonstrated experimentally. The OMZI is manufactured by splicing a tiny single mode fiber (SMF) segment with multi-mode fiber (MMF) joints laterally. The large offset structure forms an open microcavity which can be filled with the liquid under test. Through inserting the OMZI into an erbium-doped FRL, the RI measurement can be achieved by discriminating the lasing wavelength, and the detection limit (DL) can be effectively improved owing to the laser sensing spectrum with narrower 3-dB bandwidth and higher optical signal-to-noise ratio (OSNR). Experimental results show that the output laser wavelength has a linear response to the RI change with a sensitivity of −2947.818 nm/RIU during the range of 1.33302~1.33402, and the DL is as low as 5.89×10−6 RIU. Compared with other optical fiber RI sensors, the proposed fiber laser RI sensor with an open microcavity has the advantages of small size, high sensitivity and low DL, making itself a competitive candidate for the microfluidic RI measurement in biochemistry.

Conference Presentation

Citation Download Citation

Panpan Niu, Junfeng Jiang, Kun Liu, Shuang Wang, Zhe Ma, Yongning Zhang, Wenjie Chen, Tong Wang, and Tiegen Liu "Low detection limit refractive index sensor based on open microcavity Mach-Zehnder interferometer and fiber ring laser", Proc. SPIE 11554, Advanced Sensor Systems and Applications X, 115540D (10 October 2020); https://doi.org/10.1117/12.2575029

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available