Fujikura Ltd. is a global, Tokyo-based electrical equipment manufacturing company, developing and manufacturing power and telecommunication systems products, including devices for optical fibres, such as cutters and splicers.Fujikura was founded by Zenpachi Fujikura when he began manufacturing silk and cotton insulated winding wires in 1885. In 1910 Fujikura Electric Wire Corporation was established with Tomekichi Fujikura, Zenpachi's younger brother, acting as the company's representative. Over the years the company expanded both in Japan and overseas and as of 2013 the company had subsidiaries across Europe, Asia, North and South America and North Africa.The company is listed on the Tokyo Stock Exchange and is a constituent of the Nikkei 225 stock index.In February 2014 the company received an order of special large core fibers from Tokyo University for the Subaru Telescope located on Mauna Kea, Hawaii. Wikipedia.
Fujikura Ltd | Date: 2015-09-11
Fujikura Ltd | Date: 2015-01-20
An optical fiber winding reel of the invention includes: a cylindrical main winding body; main flanges provided at both respective ends of the main winding body in an axis direction thereof; and an auxiliary winding body provided outside at least one of the main flanges, wherein a slit that extends toward a central axis line of a reel is formed at part in a circumferential direction of the main flange at which the auxiliary winding body is provided, and both side portions of a position of the main flange at which the slit is formed are a low rigidity region, the low rigidity region has a rigidity locally lower than that of the other portions in a direction orthogonal to a plate surface of the main flange.
Fujikura Ltd and Hokkaido University | Date: 2015-02-10
An optical device includes: multiple cores each including an inner core and an outer core surrounding an outer circumferential surface of the inner core without any gap therebetween; and cladding surrounding an outer circumferential surface of the cores without any gap therebetween and having a refractive index lower than that of the outer core, wherein each of the cores has a tapered portion that is tapered from one side toward the other side thereof in a longitudinal direction, each of the inner cores includes a low-refractive-index portion, and a high-refractive-index portion surrounding an outer circumferential surface of the low-refractive-index portion without any gap therebetween and having a refractive index higher than that of the low-refractive-index portion, and the outer core has a refractive index lower than that of the high-refractive-index portion.
Fujikura Ltd | Date: 2015-09-29
A heat pipe for improving heat transport performance by reducing heat resistance in an evaporating section is provided. The heat pipe comprises a groove wick extending in the longitudinal direction from the evaporating section to the condensing section through the insulated section in the container. A metal powder layer formed of metal powder adhering to the inner wall of the groove wick is arranged in the evaporating section. The metal powder layer is formed into the groove wick having a predetermined thickness.
Fujikura Ltd | Date: 2015-06-24
An optical waveguide element includes: a rib waveguide and a pair of slab portions including a first slab portion and a second slab portion connected to both sides of the rib portion so as to sandwich the rib portion. The rib portion has a cross-sectional dimension which allows the propagation of a fundamental mode and a higher order mode in a predetermined single polarization state, and has a first P-type semiconductor and a first N-type semiconductor forming a PN junction, the first slab portion has a second P-type semiconductor and a P-type conductor connected to each other, the second P-type semiconductor is connected to the first P-type semiconductor of the rib portion, the second slab portion has a second N-type semiconductor and an N-type conductor connected to each other, and the second N-type semiconductor is connected to the first N-type semiconductor of the rib portion.