All-Fiber Integrated Optical Power Monitor-Controller

Zhe, 陈哲 Chen; Jiarong, 覃家荣 Qin; Hao, 潘昊 Pan; Jun, 张军 Zhang; Yating, 肖雅婷 Xiao; Jianhui, 余健辉 Yu

doi:10.3788/cjl20103704.1047

Cited by 7 publications

(3 citation statements)

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“…Optical fiber sensors, especially those with evanescent wave absorption, have already been applied in the field of biomedical sensing research [12][13][14]. Side-polished fiber (SPF) is a specific optical fiber made by removing part of the cladding from standard optical fibers through optical microfabrication technology [15][16][17]. A variety of new optical devices and sensors have been fabricated by coating with liquid crystals on their polished surfaces.…”

Section: Introductionmentioning

confidence: 99%

Sensing Characteristics of Side-Polished Fiber Based on the Alterations in Helical Structure of Thermo-Sensitive Cholesteric Liquid Crystals

Han

Jiang

Guo³

2019

Crystals

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Cholesteric liquid crystals (CLCs) are sensitive to environmental temperature changes, and have been employed as a specific intermediary for biosensors. Considering the temperature-dependent structural changes of CLCs, this study aimed to determine the sensing properties of side-polished fibers (SPFs) after coating with CLCs. The experimental results demonstrated that, with regard to the transmitted spectrum, the loss peak of CLC-coated SPFs exhibited a positive linear relationship with temperature changes over a range of 20 to 50 °C. The linear correlation coefficient achieved 97.8% when the temperature increased by 10 °C, and the loss peak drifted by 12.72 nm. The reflectance spectrum of CLCs coated on the polished surface were obtained using optical fiber sensors. The feasibility of measuring the helical structure of CLCs was further verified using SPF transmission spectroscopy. The findings indicated that the transmitted spectrum of SPFs could be adopted to characterize the helical structure of CLCs, which lays a solid foundation for further study on SPF-based biosensors.

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Section: Introductionmentioning

confidence: 99%

Sensing Characteristics of Side-Polished Fiber Based on the Alterations in Helical Structure of Thermo-Sensitive Cholesteric Liquid Crystals

Han

Jiang

Guo³

2019

Crystals

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“…Among many kinds of photosensitive materials, azo-doped LC have attracted much attention [12,13] due to their rather large photosensitivity induced by the photoisomerization of azobenzene, which is further enhanced by the transduction and amplification of the LC deformation. SPF has been a common fiber component due to its flexibility in the design of various all fiber-optic devices [14][15][16] and sensors [17][18][19]. It is able to provide a sensing platform for the LC materials.…”

Section: Introductionmentioning

confidence: 99%

A fiber-optic violet sensor by using the surface grating formed by a photosensitive hybrid liquid crystal film on side-polished fiber

Hsiao

et al. 2013

Meas. Sci. Technol.

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A fiber-optic violet sensor is demonstrated by using the surface grating formed by a photosensitive liquid crystal (LC) hybrid film on the flat area of side-polished fiber (SPF). The surface grating is constructed through a periodic intensity illuminating the hybrid LC film, where the periodic intensity is created by a phase mask through which the violet light passes. Experiment shows that a loss peak appears in the transmission spectrum between 1520 and 1620 nm, and this loss peak shifts toward shorter wavelength as the 405 nm light power increases. The wavelength shift of the peak shows very good linearity with the irradiation power between 30 and 80 mW cm−2. The very high sensitivity of the light power sensor is measured to be 1.154 nm (mW cm−2)−1, which implies that the minimum change of power intensity that can be detected is 0.866 µW cm−2 for this sensor under the limited wavelength resolution of 0.001 nm of the optical spectrum analyzer. For UV light, much higher sensitivity will be further obtained, as the LC hybrid is more sensitive to UV light than to violet light.

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“…Side-polished fiber (SPF) is fabricated by a side-polished technique, which removes a portion of cladding to form a polished region, where propagating light confined in the core can escape out to the polished surface via an evanescent wave, giving rise to strong interaction between light and the exter- nal environment. Using this characteristic, many fiber-optic sensors and others kinds of optical device have been fabricated [12][13][14][15], such as ultraviolet (UV) power sensors [16][17][18], all-fiber integrated optical power monitors [19], and lightcommandable polarization controllers [20].…”

mentioning

confidence: 99%

All-fiber-optic temperature sensor based on reduced graphene oxide

et al. 2014

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We demonstrate a novel all-fiber-optic temperature sensor based on a reduced graphene oxide (rGO) film coated onto a side-polished fiber (SPF). Significantly enhanced interaction between the propagating light and the rGO film can be obtained via strong evanescent field of the SPF. The strong light-graphene interaction results in temperature sensing with a maximum optical power variation of 11.3 dB in the SPF experimentally. The novel temperature fiber sensor has a linear correlation coefficient of 99.4%, a sensitivity of 0.134 dB • C −1 , a precision of better than 0.03 • C, and a response speed of better than 0.0228 • C s −1 . Such an rGO-based all-fiber-optic temperature sensor is easy to fabricate, is compatible with fiber-optic systems, and possesses high potentiality in photonics applications such as all-fiber-optic temperature sensing networks.

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All-Fiber Integrated Optical Power Monitor-Controller

Cited by 7 publications

References 0 publications

Sensing Characteristics of Side-Polished Fiber Based on the Alterations in Helical Structure of Thermo-Sensitive Cholesteric Liquid Crystals

Sensing Characteristics of Side-Polished Fiber Based on the Alterations in Helical Structure of Thermo-Sensitive Cholesteric Liquid Crystals

A fiber-optic violet sensor by using the surface grating formed by a photosensitive hybrid liquid crystal film on side-polished fiber

All-fiber-optic temperature sensor based on reduced graphene oxide

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