Fiber Bragg grating employing novel apodization profile: performance optimization for quasi-distributed sensing applications

Dwivedi, Krishna Mohan; Trivedi, Gaurav; Khijwania, Sunil K.

doi:10.1007/s11082-022-03691-y

Cited by 3 publications

(1 citation statement)

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“…Introduction of apodization method is highly desirable for FBG-based sensing utilizations as it removes the proportion of the side lobes range from the FBG reflectivity spectrum [6]. Apart from that, a significant apodization function also compresses the dimension of the segment of grating thus the maximum volume of reflectivity of the FBG might be decreased [7]. Therefore, a greater length of grating is essentially required for the threshold frequency.…”

Section: Introductionmentioning

confidence: 99%

Optimization and analysis of apodized fiber Bragg grating properties for quasi-distributed sensing

Mandal,

Sidhishwari

2024

Phys. Scr.

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An apodized fiber Bragg grating (FBG) is introduced with a proposed apodization function for the effective quasi-distributed sensing estimation of the temperature and the strain. FBG features such as reflectivity, side lobes, and bandwidth have been optimized for the designed apodized grating to upgrade the effectiveness of FBG for properly measuring the variations in the Bragg wavelength. Based upon the simulation, a comparative analytical study on FBG properties with different apodization function profiles has been demonstrated to achieve the optimum profile with high reflectivity, narrow bandwidth and minimal range of side lobes for quasi-distributed sensing estimation of parameters. A strong linearity has been noted for the sensitivity of designed FBG with different apodization profiles for the temperature and the strain estimation subsequently. It has been reported that the obtained sensitivity of measurands for the FBG with proposed apodization profile are higher as compared with the other profiles. The wavelength division multiplexing (WDM) based quasi-distributed network of four optimized FBGs have been implemented for different apodization profiles to illustrate the impact of apodization to prevent overlapping between neighbouring FBG spectrums in the sensing network with spatial resolution of 2 nm. The maximal detectable temperature/strain sensitivity estimation of 153 °C / 1439 μϵ have been obtained for the proposed apodized FBG along with minimal detectable temperature/strain ranges of -102 °C / -1345 μϵ in the quasi-distributed network. The achieved ranges with optimum resolution can be implemented effectively in quasi-distributed based sensing application for condition observation of civil infrastructures in any complex circumstances.

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Section: Introductionmentioning

confidence: 99%