A femtosecond laser inscribed fiber Bragg grating as a refractive index and temperature sensor based on side-polished method

2020 ◽  
Vol 34 (27) ◽  
pp. 2050296
Author(s):  
Wei He ◽  
Lianqing Zhu
Keyword(s):  
Refractive Index ◽  
Femtosecond Laser ◽  
Fiber Bragg Grating ◽  
Pulsed Laser ◽  
Grating Period ◽  
Bragg Grating ◽  
Fiber Grating ◽  
Nacl Solution ◽  
First Order ◽  
Grating Region

A fiber Bragg grating (FBG), inscribed directly by a femtosecond laser and based on the side-polished technique, was proposed and experimentally demonstrated for refractive and temperature sensing. The first-order FBG was inscribed by a 800 nm femtosecond pulsed laser, using the point-by-point method, in a fiber core with a length of 3 mm; the grating period was 537 nm. The fiber grating region was subsequently polished for 5 h and a light leak window was polished through the fiber cladding, with a length and depth of 20 mm and 37.5 [Formula: see text]m, respectively. This changed the evanescent field around the grating area to realize refractive index (RI) sensing. In the experiment, the NaCl solution RI sensitivity of the proposed fiber sensor was 854.2 nm/RIU and the linearities were 0.9989. For the temperature measurement, the sensitivity was 11.66 pm/[Formula: see text]C and the linearities were 0.9854, between 50–450[Formula: see text]C.

scholarly journals Modeling and Simulation of Fiber Bragg Grating (Fbg) as A Strain Sensor

2017 ◽  
Vol 10 (2) ◽  
pp. 260-263 ◽  
Author(s):  
Muhammad Bin Jalil
Keyword(s):  
Refractive Index ◽  
Fiber Bragg Grating ◽  
Spectral Response ◽  
Grating Period ◽  
Applied Strain ◽  
Bragg Grating ◽  
Wavelength Shift ◽  
Fiber Grating ◽  
Spectral Reflectivity ◽  
Maximum Reflectivity

This study presents the modelling, simulation, and characterization of the Fiber Bragg grating (FBG) on maximum reflectivity, bandwidth, the effect of applied strain to the wavelength shift, ʎB and sensitivity of the wavelength shift with strain for optical sensing system. In this study, a commercial FBG with the center wavelength of 1550nm is used in order to measure the spectral response of FBG to strain. The parameters used in these simulations are the fiber grating length, L ranging from 1 to 10mm, the changes in refractive index, ∆n from 0.0002 to 0.0020, the effective refractive index, is 1.46 and the grating period of FBG,Λ for 530nm in the performance of FBG. The bandwidth and spectrum reflectivity are analyzed from the variation of refractive index and grating length. Simulations on the FBG are carried out using OriginPro 2016 and Microsoft Excel 2010 software. The Excel sheet is used to generate data and the OriginPro 2016 is used to generate the graphs. The results obtained indicates the variation in grating length and refractive index affect the spectral reflectivity and the bandwidth. In addition, results obtained show that the changes in the Bragg wavelength are due to an increase in length of the grating region which due to the applied strain.

First-order fiber Bragg grating inscription in indium fluoride fiber using a UV/Vis femtosecond laser and two-beam interferometry

2021 ◽  
Vol 46 (8) ◽  
pp. 1816
Author(s):  
Ismael Chiamenti ◽  
Tino Elsmann ◽  
Aaron Reupert ◽  
Oguzhan Kara ◽  
Martin Becker ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
First Order ◽  
Fluoride Fiber

First order fiber Bragg grating inscription with femtosecond laser and reflection wavelengths from visible to infrared

2014 ◽  
Author(s):  
Martin Becker ◽  
Tino Elsmann ◽  
Anka Schwuchow ◽  
Manfred Rothhardt ◽  
Sebastian Dochow ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
First Order

Phase-shifted fiber Bragg grating inscription by fusion splicing technique and femtosecond laser

2016 ◽  
Vol 86 ◽  
pp. 236-241 ◽  
Author(s):  
Yajun Jiang ◽  
Yuan Yuan ◽  
Jian Xu ◽  
Dexing Yang ◽  
Dong Li ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Fiber Bragg Grating ◽  
Bragg Grating

scholarly journals Errata: Method to athermalize a long-period fiber grating for interrogation of fiber Bragg grating–based sensors

2014 ◽  
Vol 53 (10) ◽  
pp. 109801 ◽  
Author(s):  
Venkata Reddy Mamidi ◽  
Srimannarayana Kamineni ◽  
L. N. Sai Prasad Ravinuthala ◽  
Venkatapparao Thumu ◽  
Vengal Rao Pachava
Keyword(s):  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
Fiber Grating ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Period Fiber Grating

Development of an Optical Fiber Sensor with a D-shaped Fiber Bragg Grating Integrated in a Loop-mirror Optical Fiber Laser as a High Sensitivity Refractometer

2021 ◽  
Vol 32 ◽  
Author(s):  
Binh Pham Thanh ◽  
Thuy Van Nguyen ◽  
Van Hoi Pham ◽  
Huy Bui ◽  
Thi Hong Cam Hoang ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Fiber Laser ◽  
Fiber Bragg Grating ◽  
Limit Of Detection ◽  
Optical Fiber Sensor ◽  
High Sensitivity ◽  
Optical Signal ◽  
Bragg Grating ◽  
Loop Mirror

In this paper, we report a new type of refractometer based on a D-shaped fiber Bragg grating (FBG) integrated in a loop-mirror optical fiber laser. This proposed sensor is used in wavelength interrogation method, in which the D-shaped FBG is applied as a refractive index (RI) sensing probe and a mirror to select mode of laser. The D-shaped FBG is prepared by the removal of a portion of the fiber cladding covering the FBG by means of side-polishing technique. The D-shaped FBG sensing probe integrated in a loop-mirror optical fiber laser with saturated pump technique, the characteristics of sensing signals have been improved to obtain stable intensity, narrower bandwidth and higher optical signal-to-noise ratio compare to normal reflection configuration. The limit of detection (LOD) of this sensor can be achieved to 2.95 x 10-4 RIU in the refractive index (RI) range of 1.42-1.44. Accordingly, we believe that the proposed refractometer has a huge potential for applications in biochemical-sensing technique.

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