Topic
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.
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TL;DR: In this paper, a plasma enhanced chemical vapor deposition process was developed to deposit SiO 2 -GeO 2 films suitable for high index contrast planar waveguides, and the films were deposited in a standard parallel plate reactor from silane, germane, nitrous oxide, and a nitrogen carrier.
Abstract: A plasma enhanced chemical vapor deposition process was developed to deposit SiO 2 -GeO 2 films suitable for high index contrast planar waveguides. These films were deposited in a standard parallel plate reactor from silane, germane, nitrous oxide, and a nitrogen carrier. The germania content of the film was equal to the mole fraction germane of the hydride precursors in the gas stream, and the refractive index of the film varied linearly with the mole fraction of germania. Low loss guides ranging from 1.5-4.0% Δ were fabricated. With standard photolithographic patterning, a 0.05 dB/cm propagation loss and minimum bend radius of 1.5 mm were measured for 2.0% A. Improvements to the photolithographic patterning to reduce sidewall roughness were required to achieve low propagation loss at higher Δ. This reduced the propagation loss for 3.5% Δ cores to 0.086 dB/cm. An average minimum bend radius of 570 μm was measured for 3.5% A, but modeling suggests the bend radius could be reduced below 500 μm with offsets to reduce transition loss. Ring resonator, fabricated from 3.5% A waveguides, exhibited a free spectral range as large as 62.7 GHz and a very low round trip insertion loss of 0.06 dB.
26 citations
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TL;DR: In this paper, a dielectric-coated round waveguide was proposed to remove the degeneracy or equality of phase constants of TE 01 and TM 11 waves in a non-degenerate waveguide, which can be reduced by changing the curvature gradually instead of abruptly.
Abstract: In dielectric-coated round waveguide the degeneracy or equality of phase constants of TE 01 and TM 11 waves is removed. In such a non-degenerate waveguide, mode conversion in bends can be reduced by changing the curvature gradually instead of abruptly. With curvature tapers, which are of the order of, or longer than, the largest beat wavelength between TE 01 and any of the coupled waves, propagation of only one normal mode is maintained throughout the bend. Linear curvature tapers can easily be made by bending the pipe within the limit of elastic deformation. Changes in the direction of a waveguide line can thus be made by inserting a dielectric-coated guide section which is elastically bent over a fixed center point. A thirty degree change of direction of a 2-inch I.D. pipe with 30 ft of a dielectric-coated guide yields a total bend loss at 5.4-mm wavelength that is twice the TE 01 loss in 30 ft of straight pipe. An optimum bend geometry is found which minimizes the total bend loss. The normal mode bend is a broadband device
26 citations
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02 Jun 2006
TL;DR: A flexible collapsible corrugated drain pipe has a corrugation structure that permits a tight bending radius and relatively facile collapsing and expansion of corrugations, thereby permitting convenient manipulation and installation of drain pipe and packaging, display, storage and transportation of the collapsed pipe sections as mentioned in this paper.
Abstract: A flexible collapsible corrugated drain pipe has a corrugation structure that permits a tight bending radius and relatively facile collapsing and expansion of corrugations, thereby permitting convenient manipulation and installation of drain pipe and packaging, display, storage and transportation of the collapsed pipe sections.
26 citations
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31 Oct 2008TL;DR: In this article, a focused ion-beam fabrication of slots in existing silicon waveguides and racetrack resonators was presented, and the etch process was conducted with iodine enhancement and an alumina hard mask.
Abstract: We present the focused-ion-beam fabrication of slots in existing silicon waveguides and racetrack resonators. The etch process was conducted with iodine enhancement and an alumina hard mask. We demonstrate a propagation loss of 100 dB/cm for slot waveguides and a Q value of 850 for slot racetrack resonators with bend radius of 6 mum.
26 citations
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TL;DR: In this article, a systematic study of the electromechanical properties of graphene films for flexible transparent conducting electrodes was performed using a lab-made inner/outer bending, twisting and stretching test system.
26 citations