Bend loss in large core multimode optical fiber beam-delivery systems

Boechat, Alvaro A. P.; Hall, D. R.; Jones, Julian D. C.

doi:10.1117/12.20584

Cited by 18 publications

(25 citation statements)

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“…2), the rays traveling closer to the cladding will likely escape into the adjacent cladding region and eventually into the air due to the bend. The loss of a single bend in a large core multimode optical fiber can be calculated by analyzing the propagation of the evanescent waves of the higher order modes in its cladding [13], or by ray tracing [14]. For the optical inputs and pickups, 1 mWatt light emitting diodes (LED) ( nm) and light-to-voltage optical sensors (TSL250, made by Texas Instruments Incorporated) were used.…”

Section: Methodsmentioning

confidence: 99%

Composite Optical Bend Loss Sensor for Pressure and Shear Measurement

Huang

Wang

et al. 2007

IEEE Sensors J.

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A composite optical bend loss sensor for measuring 3-D forces has been developed. The sensor is composed of two optic fiber meshes which are embedded into a polydimethylsiloxane (PDMS) slab. The sensor consists of an array of optical fibers lying in perpendicular rows and columns sandwiched inside an elastomeric pad. A map of normal and shear stress is constructed based on observed macrobending through the intensity attenuation from physical deformation of two adjacent perpendicular fibers. Due to the new addition of the composite design and acrylic holder, the stability of the present sensor is found to be significantly better than our previously reported microfabricated optical bend loss sensor. In this paper, we will report the results of an optical bend loss simulation using the beam propagation method based on a series of images captured by a CCD camera on the fiber's bending curvatures. The result from the simulation will be compared with the results obtained from the experiment. Other results include vertical force and shear measurements at a single pressure point of the sensor. A force image algorithm is used to map the force distribution detected by the sensor. Here, we will present the results of six different shape patterns and two force magnitudes on each shape using a neural network system. We will also present a radio frequency sensor module, which we developed for the composite optical bend loss sensor for remote sensing.Index Terms-Bend loss sensor, distributive mechanical sensor, fiber-optic sensor, polydimethylsiloxane (PDMS), pressure sensor, shear sensor.

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Section: Methodsmentioning

confidence: 99%

Composite Optical Bend Loss Sensor for Pressure and Shear Measurement

Huang

Wang

et al. 2007

IEEE Sensors J.

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“…However, the bending radii used in our experiment are much smaller than 25 mm. The divergence at small radii is due to the matching the modes of the curved fiber to those in the straight fiber [9]. Additionally, a small bend radius causes the core refractive index to decrease gradually from the center to the outer side of the POFs, which reduces the power loss of POFs similar to the gradient-index fiber [16].…”

Section: Experimental Results and Analysismentioning

confidence: 98%

“…Equation (1) has been expanded to model the optical power loss in a bent step-index multimode fiber [9]. The output power P l (θ) in mode θ at position l along the fiber axis can be obtained…”

Section: A the Basic Concept Of Bending Lossmentioning

confidence: 99%

Study on the Monotonicity of Bending Loss of Polymer Optical Fiber

Chen

Xie

et al. 2015

J. Lightwave Technol.

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Bending loss of polymer optical fibers (POFs) shows unexpected oscillatory behaviors due to the interference between whispering gallery mode and core mode for the cases of small bending radius and large bending angle. We have found a novel method of suppressing the oscillatory behavior of bending loss of POFs. By partially removing the cladding and core, the bending loss monotonicity with improved linearity was obtained for POFs with small bending radius in a large range of bending angles for the first time. This method is useful in the application of extreme large strain (e.g., ࣙ60%) sensors of POF.Index Terms-Bending loss, bending sensor, extreme large strain, polymer optical fiber (POF), visible light, whispering gallery mode (WGM).

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“…where a is the radius of the fiber core and R is the bend radius measured to the axis of the fiber [23]. Now we consider the case when the fiber is terminated at a tilt angle ε as shown in Figure 6.…”

Section: Mathematical Modelmentioning

confidence: 99%

Effects of End-Face Tilt Angle on Numerical Aperture for Straight and Bent Plastic Optical Fibers

Kovačević

Djordjevich

Nikezić

2007

Fiber and Integrated Optics

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Numerical aperture (NA) is an important parameter of optical fibers. The larger it is, the greater the amount of light input into the fiber and, hence, the greater the achievable transmission distance. In this article, analytical functions are given for numerical aperture of an angle-ended plastic optical fiber in terms of the tilt angle of its input/output face. This tilt may be intentional, as in biomedical spectroscopic sensors, or otherwise when exploiting the quick interconnectivity potential of plastic fibers. The influence of fiber curvature on its numerical aperture has also been quantified as the functions given cover both straight and curved fiber configurations.

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Bend loss in large core multimode optical fiber beam-delivery systems

Cited by 18 publications

References 0 publications

Composite Optical Bend Loss Sensor for Pressure and Shear Measurement

Composite Optical Bend Loss Sensor for Pressure and Shear Measurement

Study on the Monotonicity of Bending Loss of Polymer Optical Fiber

Effects of End-Face Tilt Angle on Numerical Aperture for Straight and Bent Plastic Optical Fibers

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