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Shimakawa O.,Optical Communications RandD Laboratories | Arao H.,Optical Communications RandD Laboratories | Shiozaki M.,Analysis Technology Research Center | Sano T.,Optical Communications RandD Laboratories | Inoue A.,Optical Communications RandD Laboratories
SEI Technical Review | Year: 2013

The space division multiplexing (SDM) system using multi-core fiber (MCF) with plurality cores in one fiber is one of the promising candidates to overcome the capacity limitation of conventional fiber. To achieve practical use of MCF, a fanout device that allows each MCF core to be connected into individual single-core fiber (SCF) is indispensable. The authors have developed a pluggable fiber bundle type fan-out for MCF using an SC connector, which has low coupling loss of less than 0.5dB, low crosstalk of less than -50dB and high return loss of more than 50dB.


Maeda Y.,Optical Communications RandD Laboratories | Harumoto M.,Optical Communications RandD Laboratories | Shimazu T.,Optical Communications RandD Laboratories | Homma Y.,Optical Communications RandD Laboratories | And 2 more authors.
SEI Technical Review | Year: 2013

Thunderbolt, an innovative high-speed input/output (I/O) technology developed by Intel Corporation and Apple Inc., enables 10Gb/s transmission between a computer and peripheral devices. Based on Intel?s technical specifications, Sumitomo Electric Industries, Ltd. has developed an Optical Thunderbolt Cable by drawing on its optical fiber and module technologies. The Optical Thunderbolt Cable has the capability of long-distance transmission of up to 30 meters, excellent robustness, durability, and flexibility when using specially designed optical fiber. This paper describes the outline of Optical Thunderbolt Cable design and test results of its characteristics and reliability.


Nakanishi T.,Optical Communications RandD Laboratories | Satou F.,Optical Cable | Konishi T.,Optical Communications RandD Laboratories | Hayashi T.,Optical Communications RandD Laboratories | And 6 more authors.
SEI Technical Review | Year: 2010

In 2002, Sumitomo Electric launched its leading edge low bending loss fiber "PureAccess" that has an allowable bending radius of 15 mm. By virtue of its improved handling, the company has contributed to the construction of FTTx networks through its info-communications technology and products including cables, termination boxes and connectors. As the FTTx networks expand throughout the world, there is an ever increasing demand for fiber that facilitates overall space savings and decreases deployment time and costs. To meet the demand, we have developed a new ultra-low bending loss fiber "PureAccess-R5,7quot; which shows negligible bending loss even at a bend as small as 5 mm radius. The PureAccess-R5 is fully compliant with ITU-T G.657.B3 Recommendation, the new standard established in 2009 for minimum bending radius of 5 mm. Furthermore, the PureAccess-R5 is designed to have almost the same MFD (mode field diameter) as the conventional PureAccess, and therefore, can be connected with low coupling loss to existing access networks. This paper shows the transmission characteristics of the PureAccess-R5 including its low bending loss and low loss connectivity to existing fibers. We also describe the application of this fiber to PureFlex-slim indoor cable, which has high durability and flexibility. This newly fabricated cable realizes more reliable and flexible indoor wiring. The cable also shows excellent stability in attenuation and transmission characteristics under severe bending tests simulating actual installation and handling. Thus it is confirmed that the PureFlex-slim cable with PureAccess-R5 fiber has ideal characteristics for FTTx wiring.


Konishi K.,Optical Communications RandD Laboratories | Kanie T.,Optical Communications RandD Laboratories | Takahashi K.,Optical Communications RandD Laboratories | Shimakawa O.,Optical Communications RandD Laboratories | And 6 more authors.
SEI Technical Review | Year: 2010

Laser scribing is a commonly used process for manufacturing thin film solar cells. The quality and efficiency of the scribing process can be improved by the use of rectangular flat-top beams. The beams are formed easily by rectangular core optical fiber. The authors have developed a rectangular core optical fiber and examined its characteristics in this study. The results demonstrate that the developed optical fiber is capable of forming rectangular flat-top beams that have sufficient uniform intensity distribution. This paper also includes some investigations on factors that affect the uniform intensity distribution profiles.

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