scispace - formally typeset
Search or ask a question
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.


Papers
More filters
Journal ArticleDOI
TL;DR: In this article, the authors theoretically and experimentally demonstrate that this result is not directly applicable to shallow-etched/rib waveguide bends, and they show that the total losses caused by the bends reach a local minimum value for a certain range of compact radii and rib waveguide dimensions.
Abstract: Waveguide bends support intrinsically leaky propagation modes due to unavoidable radiation losses. It is known that the losses of deep-etched/strip waveguide bends increase inevitably for decreasing radius. Here, we theoretically and experimentally demonstrate that this result is not directly applicable to shallow-etched/rib waveguide bends. Indeed, we show that the total losses caused by the bends reach a local minimum value for a certain range of compact radii and rib waveguide dimensions. Specifically, we predicted the minimum intrinsic losses $\mu \text{m}$ bend radii in a 220 nm-thick and 400 nm-wide silicon rib waveguide with 70 nm etching depth. This unexpected outcome, confirmed by experimental evidence, is due to the opposite evolution of radiation (bending) losses and losses caused by the coupling to lateral slab modes (slab leakage) as a function of the bend radius, hence creating an optimum loss region. This result may have important implications for the design of compact and low-loss silicon nanophotonic devices.

11 citations

Patent
08 Mar 2000
TL;DR: In this article, a method of assembling an optical system includes the steps of: (i) selecting, from a plurality of optical fibers characterized by a common nominal cut-off wavelength λcn and an actual cutoff length λc such that the cutoff wavelength of each one of this plurality of fibers is the same as the nominal cut off wavelength or differs slightly from the nominal cutoff length due to manufacturing tolerances, only fibers with λ c>λmin, where λmin is a predetermined minimum acceptable cutoff wavelengths of the selected fibers; and (ii)
Abstract: A method of assembling an optical system includes the steps of: (i) selecting, from a plurality of optical fibers characterized by a common nominal cut-off wavelength λcn and an actual cut-off wavelength λc such that the cut-off wavelength λc of each one of this plurality of fibers is the same as the nominal cut-off wavelength λcn or differs slightly from the nominal cut-off wavelength due to manufacturing tolerances, only fibers with λc>λmin, where λmin is a predetermined minimum acceptable cut-off wavelength of the selected fibers; and (ii) bending at least one section of at least one of these selected fibers such that this bent section has a bend radius R, where 12 mm

11 citations

Journal ArticleDOI
TL;DR: In this paper, an incremental in-plane bending machine is used for small-lot production of strip with various bending radii, where the strip is bent incrementally by an inclined punch beating and the bending radius calculated by the proposed formula agrees with one of the experiments.

11 citations

Journal ArticleDOI
TL;DR: In this article, a series of experiments and a finite element analysis was carried out in order to investigate an optimum condition of a mandrel for preventing defects in a rotary draw bending of a copper tube with thin wall.

11 citations

Patent
17 Mar 1998
TL;DR: In this article, a rotary pull bending method was used to decrease a thickness reducing rate on the outer peripheral side of bending even when a pipe to be worked is longer and thinner.
Abstract: PROBLEM TO BE SOLVED: To decrease a thickness reducing rate on the outer peripheral side of bending even when a pipe to be worked is longer and thinner in a method for bending the pipe by a rotary pull bending method SOLUTION: The side of one end part of the pipe P to be worked is held with a bend roll 1, the outer peripheral side of the bending part of the pipe P to be worked is engaged with the groove 31 of a die 3 After respectively clamping the inner peripheral side of bending and outer peripheral side of bending on the side of the other end part of the pipe P to be worked with an inside clamp 4 and outside clamp 5 and, in the state in which compressive load is applied to the outer peripheral side of bending in the bending part of the pipe P to be worked with the outside clamp 5 and also tensile load is applied to the inner peripheral side of bending in the bending part of the pipe P to be worked with the inside clamp 4, the bend roll 1 is rotated and, by pulling out the bending part of the pipe P to be worked from the groove 31 of the die 3 and mating the bending part with the bend roll 1, the pipe is bent into a bend radius in accordance with the circular-arc of the bend roll 1

11 citations


Network Information
Related Topics (5)
Silicon
196K papers, 3M citations
78% related
Laser
353.1K papers, 4.3M citations
78% related
Thin film
275.5K papers, 4.5M citations
78% related
Coating
379.8K papers, 3.1M citations
77% related
Dielectric
169.7K papers, 2.7M citations
77% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202365
2022172
202181
2020112
2019135
2018153