High-sensitivity sensor design based on cascaded long-period fiber grating with film coating

Zhengtian Gu; Xiuli Jiang; Haiyun Chen

doi:10.1117/1.OE.53.2.021104

5 September 2013 High-sensitivity sensor design based on cascaded long-period fiber grating with film coating

Zhengtian Gu, Xiuli Jiang, Haiyun Chen

Author Affiliations +

Optical Engineering, Vol. 53, Issue 2, 021104 (September 2013). https://doi.org/10.1117/1.OE.53.2.021104

Abstract

A cascaded long-period fiber grating (CLPFG) sensor with film coating is presented. Two long-period fiber gratings (LPFGs) are cascaded to form a Mach-Zehnder interferometer. The optical transmission spectrum and the sensing characteristics for ambient refractive index (RI) measurement of the CLPFG sensor are analyzed in a form of transfer matrix based on rigorous coupled-mode theory. The results indicate that it is highly sensitive to the film RI and surrounding RI, so it can be used as a gas sensor or a solution sensor. Data simulation shows that the resolution of the RI of the films is predicted to be 10 ⁻⁷ . Further, a cascaded chirped LPFG is introduced to study its sensing performance. The influence of the chirp coefficient and the grating structural parameters on the transmission spectrum of the cascaded chirped LPFG is analyzed. Data simulation shows that the resolution of the RI of the films is predicted to be 10 ⁻⁹ . In contrast to the conventional measurement method based on interrogating the wavelength change, intensity detection of this cascaded chirped LPFG sensor means that no optical spectrum analyzer is required in the measuring system, which is favorable for practical applications, especially for in situ environmental motoring.

Citation Download Citation

Zhengtian Gu, Xiuli Jiang, and Haiyun Chen "High-sensitivity sensor design based on cascaded long-period fiber grating with film coating," Optical Engineering 53(2), 021104 (5 September 2013). https://doi.org/10.1117/1.OE.53.2.021104

Published: 5 September 2013

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