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Microwave Photonic Interrogation of a High-Speed and High-Resolution Multipoint Refractive Index Sensor

Microwave photonic interrogation of a high-speed and high-resolution multipoint refractive index (RI) sensor based on an Au-coated tilted fiber grating (Au-TFBG) array is proposed and experimentally demonstrated. Due to the surface plasmon resonance (SPR), the optical spectrum of an Au-TFBG has a dip in the spectral envelope. When an Au-TFBG is immersed in a solution and the RI of the solution changes, the location of the dip will shift, reflecting the change of the RI. For multipoint sensing, an Au-TFBG array with the array elements located at different locations is employed. However, due to the overlap of the spectra of the Au-TFBGs in the array, the dips cannot be precisely located by optical spectrum measurement. A solution is to convert the spectra to the time domain based on spectral shaping and wavelength-to-time (SS-WTT) mapping with the mapped temporal waveforms separated by different time delays. By using a digital signal processor (DSP), the sensing information can be extracted at a high speed and high resolution. The proposed approach is evaluated experimentally. Experimental results show that the sensor has high RI accuracies of 3.1×10−5, 2.5×10−5 and 2.6×10−5 refractive index unit (RIU) and a fast sensing speed of 11.75 kHz.

Ketersediaan

Informasi Detail

Judul Seri

JOURNAL OF LIGHTWAVE TECHNOLOGY; Vol.40 No.4 February 15 2022

No. Panggil

-

Penerbit

: .,

Deskripsi Fisik

p. 1245-1251

Bahasa

English

ISBN/ISSN

-

Klasifikasi

NONE

Tipe Isi

-

Tipe Media

-

Tipe Pembawa

-

Edisi

-

Subjek

MICROWAVE PHOTONICS
SURFACE PLASMONIC RESONANCE
ENVELOPE DETECTION
MULTIPOINT REFRACTIVE INDEX MEASUREMENT
TILTED FIBER BRAGG GRATING ARRAY

Info Detail Spesifik

10.1109/JLT.2021.3127239

Pernyataan Tanggungjawab

Guangying Wang, Baoliang Liao, Yuan Cao, Tuan Guo, Xinhuan Feng, et al.

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