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Bend radius

About: Bend radius is a research topic. Over the lifetime, 3303 publications have been published within this topic receiving 35415 citations. The topic is also known as: minimum bend radius.


Papers
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Journal ArticleDOI
TL;DR: In this paper, a geometric deformation-based index-shift-based approach is proposed to tune a diode laser with a low-confinement silicon nitride-based ring resonator.
Abstract: Typical integrated optical phase tuners alter the effective index. In this paper, we explore tuning by geometric deformation. We show that tuning efficiency, Vπ L, improves as the device size shrinks down to the optimal bend radius, contrary to conventional index-shift based approaches where Vπ L remains constant. We demonstrate that this approach is capable of ultra-low power tuning across a full FSR in a low-confinement silicon nitride based ring resonator of 580 μm radius. We demonstrate record performance with VFSR = 16 V, Vπ L = 3.6 V dB, Vπ Lα = 1.1 V dB, tuning current below 10 nA, and unattenuated tuning response up to 1 MHz. We also present optimized designs for high confinement silicon nitride and silicon based platforms with radius down to 80 μm and 45 μm, respectively, with performance well beyond current state-of-the-art. Applications include narrow-linewidth tunable diode lasers for spectroscopy and non-linear optics, optical phased array beamforming networks for RF antennas and LIDAR, and optical filters for WDM telecommunication links.

61 citations

Journal ArticleDOI
TL;DR: In this article, the U-shaped probe is used to increase the evanescent field in the film and hence its interaction with the dyes present in the films, and the influences of bending radius of the probe and the numerical aperture of the fiber on the sensitivity of the sensor are studied.
Abstract: Fabrication and characterization of U-shaped fiber optic pH probes utilizing evanescent field absorption spectroscopy and dye doped sol–gel immobilization technology are presented. The U-shaped probe is used to increase the evanescent field in the film and hence its interaction with the dyes present in the film. The influences of bending radius of the probe and the numerical aperture of the fiber on the sensitivity of the sensor are studied. It has been shown that, for a given pH, as the bending radius of the U-shaped probe decreases the sensitivity of the sensor increases. Further, for a given bending radius and the fiber core diameter, increase in the numerical aperture of the fiber increases the sensitivity of the pH sensor. The response time of the sensor reported in the present study is approximately 15 s.

61 citations

Journal ArticleDOI
28 Apr 2010-Pramana
TL;DR: In this article, the effects of bending radius (4-15 mm, with steps of 1 mm) and wrapping turns (up to 40 turns) on optical power loss were investigated.
Abstract: Loss of optical power in a single-mode optical fibre due to bending has been investigated for a wavelength of 1550 nm. In this experiment, the effects of bending radius (4–15 mm, with steps of 1 mm), and wrapping turns (up to 40 turns) on loss have been studied. Twisting the optical fibre and its influence on power loss also have been investigated.

61 citations

Journal ArticleDOI
10 Jun 2009-Sensors
TL;DR: Experimental results demonstrated that the sensitivity characteristics of LPGs to refractive index could be controlled by grating length and bend radius.
Abstract: The influence of grating length and bend radius of long-period gratings (LPGs) on refractive index sensing was examined. Sensitivity to refractive indexes smaller than that of silica could be enhanced by bending LPGs. Bent LPGs lost sensitivity to refractive indexes higher than that of silica, whereas a 20-mm-long LPG arranged in a straight line had considerable sensitivity. These experimental results demonstrated that the sensitivity characteristics of LPGs to refractive index could be controlled by grating length and bend radius.

61 citations

Journal ArticleDOI
TL;DR: In this article, a-Si TFT fabrication technology using 80-μm ultrathin stainless steel foil as the substrate and integrating driver electronic in the display panel was introduced.
Abstract: This paper introduces the technology behind developing of flexible AM-OLED displays with improved color and reduced bending radius. Developing a-Si TFT fabrication technology using 80-μm ultrathin stainless steel foil as the substrate and integrating driver electronic in the display panel, we were able to demonstrate a full-color AM-OLED displayed in a curvature of less than 5 cm bending radius. Total panel thickness of 0.30 mm, brightness of 100 cd/m2 and color reproducibility of 63% were achieved.

61 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202365
2022172
202181
2020112
2019135
2018153