Sensitivity Enhancement of Turn-Around-Point Long Period Gratings By Tuning Initial Coupling Condition

被引：50

作者：

Biswas, Palas ^{[1
]}

Basumallick, Nandini ^{[1
]}

Bandyopadhyay, Sankhyabrata ^{[1
]}

Dasgupta, Kamal ^{[1
]}

Ghosh, Ajay ^{[2
]}

Bandyopadhyay, Somnath ^{[1
]}

机构：

[1] Cent Glass & Ceram Res Inst, CSIR, Fiber Opt & Photon Div, Kolkata 700032, India

[2] Univ Calcutta, Dept Appl Opt & Photon, Kolkata 700098, India

来源：

IEEE SENSORS JOURNAL | 2015年 / 15卷 / 02期

关键词：

Long period grating; turn-around-point; refractive index sensing; FIBER GRATINGS; INDEX;

D O I：

10.1109/JSEN.2014.2361166

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Long period grating (LPG) at turn-around-point (TAP) has been studied with a view to enumerate the dependence of sensitivity of a particular resonant mode at the TAP to surrounding refractive index on the initial coupling strength. It has been shown theoretically and also validated experimentally that sensitivity can be enhanced significantly by tailoring the coupling strength of the cladding mode at the resonant wavelength near the TAP. Sensitivity characteristics have been studied for surrounding refractive index in the range 1.335-1.360, which is of interest in the field of biosensors, where the sensitivity of conventional LPGs is relatively small. We could attain a sensitivity of similar to 1850 nm/RIU using a TAP-LPG with similar to 3-dB attenuation at resonance.

引用

页码：1240 / 1245

页数：6

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