High-density Cables Research Articles

Ultrahigh Fiber Count and High-Density Cables, Deployments, and Systems

Since the 1980s, the single-core optical fiber cable has been the essential data transmission wiring media, with ongoing increases in deployments. Its use case has broadened, with transmission distances ranging from meters to 10000s km, including intrabuilding, fiber-to-the-home (FTTH), terrestrial, and even submarine trunk lines. Currently, optical fiber cable deployment is strongly driven by cloud-based storage, X as a Service (XaaS), and worldwide data center (DC) functionality with the optical interconnection of massive servers on DC campuses. Hence, it is quite natural that the optical fiber cable industry has developed ultrahigh fiber count, high density, and small diameter optical fiber cable, e.g., 6912-fiber-count cable. With high-density cables, massive data capacity can be installed at one time while saving limited space in an underground duct. High-density cable designs have been developed not just by cable structure optimization but through the process of bundling fibers and the use of high-grade optical fibers. Moreover, many enabling technologies have been developed to support the deployment of ultrahigh fiber count cables, such as fiber identification, connectors, mass fusion splicing, and storage systems for fusion splicing points. In this article, state-of-the-art technologies and prospects for ultrahigh-count and ultrahigh-density optical fiber cables and enabling technologies are explained.

3-D Measurement of Rollable Fiber Ribbons in 1000-Fiber Cable and Calculated Fiber Reliability

We propose a technique for the 3-D measurement of fiber position to allow the experimental evaluation of the fiber reliability of 1000-fiber high-density cables. We acquire the fiber positions from the position of peaks in a cross-sectional X-ray computed tomography image. We can evaluate the cable reliability by calculating the fiber strain imposed by bending and twisting from the fiber positions. To calculate the fiber strain, we also propose the models of the deformation of rollable optical fiber ribbon in a cable. The measured fiber positions coincide well with the deformation models that we proposed and revealed in which the calculated cable strains are almost the same as or lower than those that we estimated theoretically. Consequently, the equivalent strain is less than the allowable value needed for maintaining reliability when the other strain factors are the same as those of the conventional high-density cable.

Fracture evolution law and control technology of roadways with extra thick soft roof

Abstract The key point to solve the maintenance problem of roadways with extra thick soft roof is to understand how the fracture evolves in surrounding rocks. To research the fracture evolution law of panel 15107 in Huangyanhui Coal Mine, multi-parameter monitoring methods including the borehole imaging, geo-radar and roof separation monitoring are applied at the mining site. Universal Distinct Element Code (UDEC) was employed to research the fracture evolution and deformation characteristics with different thicknesses and strength of mudstone roof. The result shows the process of the propagation, the crack-opening and the separation characteristic of this type of roadway is a dynamic process gradually developing upwards. In the anchored zone, the fracture is fully developed and is severely separated and crushed. During the mining process, the separation is relatively small and the load of bolts is stable in the anchored zone, but the load on the cables increase rapidly. Based on the above result, the author proposed a new support principle that intensifies the roof strength, and controls the ribs and the roof together. The support method of the high-strength bolt-beam-net, the high density cable and the cable-grout technology is applied in the roadway support, which is effective in maintaining the roadway stability.

High-density cable and method therefor

A high-density cable of a type suitable for transmitting ultrasound signals from an ultrasonic probe to multiplexing circuitry during a medical ultrasound procedure is provided. The cable includes one or more flexible circuits arranged within a flexible sheath that surrounds and confines the flexible circuits. Each flexible circuit includes an elongate flexible substrate with oppositely-disposed surfaces and multiple conductors on at least one of these surfaces. The opposing longitudinal ends of the substrate define integral connectors for connecting with respective output connectors and/or electronic devices, such as an ultrasonic probe or multiplexing circuitry.

Current Advances in Development of Material in the Field of Wiring in Japan

AbstractThis paper presents the current advances in the development of materials in the field of telecommunication wiring together with the background which created the need for the new technologies. The background is somewhat unique to the current socio-economical situation of Japan. The key technical areas, which are addressed in this paper, are; (1) fibers for transmission of over 1 Tbps by utilizing WDM (wavelength division multiplexing), (2) fibers for fiber amplifiers to replace repeaters within trunk lines, (3) high density cables with over 1000 fiber counts, (4) ABF (air blown fiber) for access system, (5) plastic optical fibers wiring in premises or offices operating at the transmission speed of over 200 Mbps.