Ultra-Stable and Real-Time Demultiplexing System of Strong Fiber Bragg Grating Sensors Based on Low-Frequency Optoelectronic Oscillator

Wide-area and multi-point remote sensing technology plays an important role in the fields of disaster monitoring and locating. We demonstrate a demultiplexing method for quasi-distributed identical strong fiber Bragg grating (FBG) sensors based on optoelectronic oscillator (OEO). When the FBG sensor...

Full description

Saved in:
Bibliographic Details
Published in:Journal of lightwave technology 2020-02, Vol.38 (4), p.981-988
Main Authors: Wang, Wenxuan, Liu, Yi, Du, Xinwei, Zhong, Xiaoxuan, Yu, Changyuan, Chen, Xiangfei
Format: Article
Language:English
Subjects:
Alarm systems
Bragg gratings
Demultiplexing
Demultiplexing system
Digital signal processing
Fiber gratings
Frequency ranges
Frequency stability
multisensor systems
optical fiber measurement applications
Optical sensors
Optoelectronic devices
optoelectronic oscillator
Oscillators
Remote sensing
Remote sensors
Response time
safety
Sensors
strong fiber Bragg grating
Temperature measurement
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Wide-area and multi-point remote sensing technology plays an important role in the fields of disaster monitoring and locating. We demonstrate a demultiplexing method for quasi-distributed identical strong fiber Bragg grating (FBG) sensors based on optoelectronic oscillator (OEO). When the FBG sensor is affected by environmental changes, the wavelength of the FBG will shift. An oscillation will be stimulated in the OEO since the laser power is reflected by the FBG. The demultiplexing system utilizes the oscillating frequency of the OEO to encode the location information of grating series. Compared with other schemes, the proposed system has three superior advantages. First, as a digital discrete position encoding system, it has a strong anti-interference ability and does not require continuous sweeping wavelength and rapid digital signal processing, which can achieve high speed and high stability. Second, it can demodulate identical FBGs with strong reflectivity, thus ensuring long-distance and large capacity. Third, it can work in a low-frequency range without using high-frequency devices, which has the potential to be a low-cost interrogator in practical applications. The theoretical capacity of the system is 62 multiplexed points in one line and the experimental results show that the sensing area can range from 1 m∼1 km with the response time of ∼0.61 s and the oscillating frequency stability of
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2019.2949682