The simulation and experimental research on the sensing characteristics of few-mode-fiber based LPFG

Guanghui Chen; Mei Sang; Chenhao Zhong; Biao Wang; Weigang Zhang

doi:10.1117/12.2208641

4 March 2016 The simulation and experimental research on the sensing characteristics of few-mode-fiber based LPFG

Guanghui Chen, Mei Sang, Chenhao Zhong, Biao Wang, Weigang Zhang

Proceedings Volume 9742, Physics and Simulation of Optoelectronic Devices XXIV; 97421T (2016) https://doi.org/10.1117/12.2208641
Event: SPIE OPTO, 2016, San Francisco, California, United States

Abstract

Compared with FBG, long period fiber gratings (LPFGs) have higher sensing sensitivity in many aspects. With the development of few-mode fiber (FMF), few mode long period fiber gratings (FM-LPFGs) has grasped a lot of research focus in recent years. The co-propagating coupling between a core mode and a cladding mode, or two different core modes, will bring different effects on the sensing characteristics of temperature, strain and refractive index. However, the coupling characteristics between core modes and cladding modes have been rarely reported in theory before. In this paper, based on the coupled-mode theory, we simulate the transmission spectrum of the FM-LPFGs by use of MATLAB and COMSOL software. Assuming that all the power is launched in a certain mode, we calculate the coupling coefficients and the transmission spectrums between the core modes (LP₀₁, LP₁₁, LP₂₁, and LP₀₂) and the cladding modes LP_lm(l=1) at 1550nm. In addition, we change some fiber parameters like grating period, refractive index modulation depth and cladding diameter to analyze their effect on the transmission spectrum. Based on the simulation, we fabricate some FM-LPFGs by the CO₂ laser, and use them in temperature sensing experiments. With the certain strain, we measured the temperature sensing sensitivity of the FM-LPFGs. The measured sensitivities of temperature is -43.98pm/°C.

Citation Download Citation

Guanghui Chen, Mei Sang, Chenhao Zhong, Biao Wang, and Weigang Zhang "The simulation and experimental research on the sensing characteristics of few-mode-fiber based LPFG", Proc. SPIE 9742, Physics and Simulation of Optoelectronic Devices XXIV, 97421T (4 March 2016); https://doi.org/10.1117/12.2208641

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