Characteristics of Long-Period Optical Fiber Grating with High Refractive Index nm-Thick Film Overlay

Xiujuan, 于秀娟 Yu; Min, 张敏 Zhang; Liwei, 王利威 Wang; Ming, 雷鸣 Lei; Yanbiao, 廖延彪 Liao

doi:10.3788/aos20092910.2665

Cited by 3 publications

(1 citation statement)

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“…The theoretical calculation about the LPG thin-film sensors in Ref. [9] shows that the the parameters (thickness and refractive index) of the film will directly related to the refractive index of cladding mode, which will causes the spectral characteristics. When the coated LPG sensor experiences differnt humidty levels, the thickness and the refractive index of the hydrogel film will change, leading to the shift of the resonant wavelength and the change of the transmission minimum.…”

Section: Theorymentioning

confidence: 99%

Hydrogel Coated Long Period Grating Sensor for High Relative Humidity Measurement

Zhang

Chen

et al. 2014

AMR

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A very sensitive hydrogel coated long period grating (LPG) humidity sensor is developed and experimentally investigated for high relative humidity monitoring. A thin-film of PINPAM hydrogel is deposited onto the cladding of LPG by using dip-coating technique. The transmission spectrum of the coated LPG is studied at different humidity levels. For humidity levels greater than 95%, the resonant dip depth suffers a sharp linear increase with a span of 10.26 dB and the resonant wavelength suffers a redshift of 8.6nm.The proposed hydrogel coated LPG humidity sensor shows a high sensitivity of 2.86dB/%RH at high relative humidity region.

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Section: Theorymentioning

confidence: 99%

Hydrogel Coated Long Period Grating Sensor for High Relative Humidity Measurement

Zhang

Chen

et al. 2014

AMR

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New understanding of “mode transition” of coated long period fiber grating

Feng

2019

Optik

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Characteristics and design of coated LPFG sensor based on mode transition

Lan

Chen

et al. 2013

2013 13th International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD)

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Abstract-The mode transition in a coated long-period fiber grating (LPFG) has been studied based on coupled-mode theory. The response of cladding mode effective index with increasing overlay thickness is analyzed. The lower order modes are transferred to the overlay, and the higher order modes replace the lower order modes order by order and continue to propagate in the cladding. Further, the transmission spectrum of the coated LPFG is investigated while the overlay thickness is located in mode transition and the surrounding region, the amplitude of attenuation peak of the cladding mode which will enter the overlay decreases rapidly and the peak position of adjacent higher cladding mode shift towards the former lower mode. To design high sensitivity LPFG sensor, the optimal overlay thickness is selected to ensure that the coated LPFG is located in the mode fast transition region. Finally, the response characteristics of film refractive index of coated LPFG were investigated for two typical cladding modes, and two kinds of the sensor sensitivity are defined and calculated. The results indicate that the resolution of film refractive index in mode transition can be available to 10 -6 and 10 -7 respectively, if the sensor is detected by transmittance change and wavelength shift.

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Characteristics of Long-Period Optical Fiber Grating with High Refractive Index nm-Thick Film Overlay

Cited by 3 publications

References 0 publications

Hydrogel Coated Long Period Grating Sensor for High Relative Humidity Measurement

Hydrogel Coated Long Period Grating Sensor for High Relative Humidity Measurement

New understanding of “mode transition” of coated long period fiber grating

Characteristics and design of coated LPFG sensor based on mode transition

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