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.

Multicore Fiber Optimization for Application to Chip-to-Chip Optical Interconnects

Abstract: We present the design of a holey microstructured multicore optical fiber optimized to meet the stringent requirements of chip-to-chip optical interconnects, namely, be compatible with high-speed vertical-cavity surface-emission lasers, feature ultrahigh channel density, low crosstalk, and millimeter-bend resistance to sustain the tight bends required on an electronic circuit board. We show that the shortcomings of the standard hexagonal microstructure can be overcome by the use of seven-rod cores. We present the detailed simulation results of the crosstalk and bend loss as a function of all the important microstructure parameters that led to the optimized solution. We discuss the crosstalk dependence on the bending radius. To our knowledge, the multicore fiber presented here achieves the highest normalized core density proposed to date, low enough crosstalk for meter-long transmission at 10 Gb/s and bend loss <; 0.02 dB/loop at a 1-mm bend radius. Maximizing space-division multiplexing, it has the potential to allow Tb/s·cm2 optical interconnects without the need for wavelength-division multiplexing.

Wobble piston and seal assembly for oil free compressor

Abstract: The present invention is directed to a wobble piston and seal assembly for an oil free compressor. An upwardly directed curvature is provided on a piston surface which supports the seal. The curvature is located adjacent the perimeter of the surface to impart a slight dish shape to the surface. Preferably, the curvature has the same radius as the bend radius of the seal when the piston head is inserted into a cylinder. When the seal is initially clamped to the support surface, the seal is formed to take on the curvature of the support surface. Consequently, the seal is preformed into a shallow cup shape prior to final forming when the piston and seal assembly are inserted into a cylinder.

Coupling Characteristic of a Novel Hybrid Long-Range Plasmonic Waveguide Including Bends

Abstract: In this paper, the modal analysis of a novel design of a hybrid long-range plasmonic waveguide is introduced and analyzed using the full-vectorial finite difference method. The suggested design has high index material as a cap to reduce the propagation loss and optimum bending radius as well. The analyzed parameters are the real effective index and propagation loss. In addition, the bending analysis of the reported design is introduced. The coupling is performed between three different waveguides: straight dielectric waveguide, straight hybrid long-range plasmon waveguide, and uniformly bent hybrid one.

Design of tight bends in silicon-on-insulator ridge waveguides

Abstract: In this work numerical analysis was used to explore ways for reducing bending losses in silicon-on-insulator ridge waveguides. Bending losses in single-mode ridge waveguides with different sizes were calculated. The results obtained were used in a numerical optimization of an S-bend structure. Also, the loss reduction achieved by placing a groove along the side of a bend was determined. Calculations were made for both TE and TM polarizations at 1550nm wavelength. Smaller waveguides were found to cause much smaller bending losses. The groove structure allows the use of ten times smaller bending radii. With the groove, a ridge waveguide with 1.5µm thickness and 75µm bending radius was found to have only 0.7dB loss in a 90° turn, when both bending and junction losses were taken into account. The numerical path optimization of an S-bend halved the total loss in dB.