Optical-path difference on-line measurement of multiplexing fiber-optic interferometric sensors using TDM and WDM by improved optical-frequency-domain reflectometry

Shuwang Li; Guoguang Lu; Canxiong Lai; Yun Huang; Yunfei En

doi:10.1117/12.2542633

18 December 2019 Optical-path difference on-line measurement of multiplexing fiber-optic interferometric sensors using TDM and WDM by improved optical-frequency-domain reflectometry

Shuwang Li, Guoguang Lu, Canxiong Lai, Yun Huang, Yunfei En

Author Affiliations +

Proceedings Volume 11340, AOPC 2019: Optical Fiber Sensors and Communication; 113400N (2019) https://doi.org/10.1117/12.2542633
Event: Applied Optics and Photonics China (AOPC2019), 2019, Beijing, China

Abstract

Optical-path difference (OPD) is a key parameter for the fiber-optic interferometer, especially for the large-scale multiplexing of fiber-optic interferometric sensors (FOIS) array. Due to the OPD directly affects the background noise of the system and the performance consistency among different array elements. Most of the time, the latter is very critical for the FOIS array. Several methods have been adopted for the OPD measurement of the fiber-optic interferometer, including the white-light interferometry, the optical-time-domain reflectometry (OTDR), the optical-frequency-domain reflectometry (OFDR). Unfortunately, none of the methods mentioned above can directly realize OPD on-line measurement of FOIS, which is multiplexed with the time division multiplexing (TDM) and the wavelength division multiplexing (WDM). In this paper, an OPD measurement method for multiplexing FOIS using TDM and WDM based on the improved OFDR has been present. The most distinguishing feature of this method is that it transformed the FOIS array under tested into a part of the OFDR system. The modulated linear sweep light directly injected into the FOIS array under tested and traversed every array element through array network. Thus every interferometer of FOIS became the interferometric structure of the improved OFDR, and the OPD measurement of complexity multiplexing FOIS array has been vastly simplified into the fiber length measurement of interferometer in proper order. Results show that the measurement accuracy of this approach can achieve millimeter level and the measurement range up to hundred meters for FOIS using TDM and WDM through a single measurement.

Citation Download Citation

Shuwang Li, Guoguang Lu, Canxiong Lai, Yun Huang, and Yunfei En "Optical-path difference on-line measurement of multiplexing fiber-optic interferometric sensors using TDM and WDM by improved optical-frequency-domain reflectometry", Proc. SPIE 11340, AOPC 2019: Optical Fiber Sensors and Communication, 113400N (18 December 2019); https://doi.org/10.1117/12.2542633

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