An effective attenuation coefficient for evanescent wave spectroscopy using multimode fiber

Ruddy, Vincent P.

doi:10.1080/01468039008202901

Cited by 67 publications

(21 citation statements)

References 4 publications

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“…Modal redistribution length of the fiber is about few hundred meters thus the effect of tapers is local length [2]. If bare core is surrounded by an absorbing medium such as a liquid, the effective absorption coefficient of the evanescent field is inversely proportional to the radius [7].Thus, in this research, a coupler can be developed by aligning two bare core in close proximity to each other and to lessen the loss by the evanescent field effect, liquid such as glue having appropriate refractive index will be used surrounding the two fibers. According to Huang [8], the simplest model for the coupled waveguide system is a directional coupler which consists of two uniform, parallel waveguides placed in close proximity.…”

Section: Discussionmentioning

confidence: 99%

Polymer optical fiber tapering using chemical solvent and polishing

2017

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Abstract.A method for developing polymer optical fiber (POF) directional coupler is introduced where the initial procedure includes using chemical solvent to remove the cladding, and bare out the core in order to align the unclad center of the fiber with other similar fiber to develop a coupler. The process is safe, simple, inexpensive and require low operation skill. The etched fiber offers improvement to the performance of various POF devices, i.e, couplers and sensors. Instead of relying only on silica or glass fiber, POF now can be used as an alternative to improve the network performance in short distance communication system. The measurement parameters laid out offer great outcomes. However, the couplers intended to be developed is yet to be realized, where deeper research and various experiments are needed in order to develop a simple but optimum performance coupler that can be used for various applications.

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Section: Discussionmentioning

confidence: 99%

Polymer optical fiber tapering using chemical solvent and polishing

2017

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“…In this case, the optical fiber plays the most direct role in the sensing process and the characteristic equation of the sensors may be re-written as [55,56] …”

Section: Evanescent Wave Gas Sensormentioning

confidence: 99%

Gas detection with micro- and nano-engineered optical fibers

Jin

Cao

et al. 2013

Optical Fiber Technology

138

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a b s t r a c tThis paper overviews recent development in gas detection with micro-and nano-engineered optical fibers, including hollow-core fibers, suspended-core fibers, tapered optical micro/nano fibers, and fiber-tip micro-cavities. Both direct absorption and photoacoustic spectroscopy based detection schemes are discussed. Emphasis is placed on post-processing stock optical fibers to achieve better system performance. Our recent demonstration of distributed methane detection with a $75-m long of hollow-core photonic bandgap fiber is also reported.

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“…This is indeed required to achieve higher sensitivity and can be achieved by tapering the sensing region, 15 loworder mode removal via masking at the launch optics, 16 or bending the optical fiber in the sensing region. However, d p , and hence r, rises sharply as the ray angle approaches the critical angle of the sensing region.…”

Section: ͑2͒mentioning

confidence: 99%

Performance optimized optical fiber sensor for humidity measurement

2005

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A comprehensive experimental study of a fiber optic relative humidity (RH) sensor is carried out in terms of characterization and performance optimization against various parameters that affect the sensor response and sensitivity e.g., film composition, film thickness, fiber core diameter, and the sensor geometry. The sensor is based on evanescent wave absorption spectroscopy and utilizes a specific reagent immobilized permeable polymer membrane cladding on a declad U-bend optical fiber. An optimum film thickness and an optimum film composition exist. In addition, a fiber with a smaller core diameter was observed to be more sensitive, unlike the previously reported results. The sensitivity further increases with a decrease in the bending radius. The sensor is found to be sensitive to RH ranging from ϳ1.6 to ϳ92%, exhibiting a very fast response time, an extremely good degree of reversibility, repeatability, and a large dynamic range. © 2005 Society of Photo-Optical Instrumentation Engineers.

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An effective attenuation coefficient for evanescent wave spectroscopy using multimode fiber

Cited by 67 publications

References 4 publications

Polymer optical fiber tapering using chemical solvent and polishing

Polymer optical fiber tapering using chemical solvent and polishing

Gas detection with micro- and nano-engineered optical fibers

Performance optimized optical fiber sensor for humidity measurement

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