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R & D Review

No.107

No.107 October 2010

Development of the Fused Optical Fiber Bundle for High Power Laser

Recently, process technology with more than several kW high power laser is often utilized to manufacture automobile. And higher output power obtaining methods have been developing by the combining technique of several high power laser outputs.
In this paper, as one approach of combining techniques for high power laser, we report on the fused optical fiber bundle for the high power laser fabricated by using the fusion techniques of the fiber end.
[Key words] High Power Laser, Combining, Fused Fiber Bundle, Torch Method, Heater Method

Optical Pulse Amplification of MOPA System with Large Core Yb Doped Double Cladding Fiber

The pulsed fiber lasers have been used in the many fields such as laser marking, laser welding, scribing of thin film solar cell. Effective approach for nonlinear optical effects such as Stimulated Brillouin Scattering (SBS) is important in order to improve the peak power level of the pulsed fiber laser. We have developed Master Oscillation Power Amplifier (MOPA) system with the ytterbium (Yb) doped double cladding fiber that has large core to suppress the nonlinear optical effect, and we report the pulse amplification characteristics of our MOPA system in this paper. In addition, we introduce the characteristics of the mode field converter with low loss and the multi mode fiber pump combiner.
[Key words] Double Cladding Fiber, Combiner, Mode Field Converter, MOPA, Pulsed Fiber Laser, SBS

Development of Step-In-Branch™ Cable

In architectural field of apartment house or high rose buildings, the built-up construction method, in which floors are built up one by one and interior is finished up, is increasing.
Because branch cable of no separate type is not possible to correspond to the built-up construction method, Step-In-Branch cable in which the connection of the main wiring cable is possible was developed as separate type branch cable. Step-In-Branch became possible, by using Step-In-Nut™ newly designed, to achieve the tension-proof and the no skill connection, and achieved the connection of the main wiring requested by the built-up construction method.
[Key words] Layer-Built, Branch, Main Wiring, No Skill, Tension-Proof, Connector

Electrostatic Type Cable Location System

In the central control room of the plants such as power stations or substations, thousands of control cables are extended to various places in the plants from the control panel. When we remove unnecessary cables because of such as the update of the central control room, it is necessary to distinguish them from necessary cables precisely. But the number of whole cables itself amounts several thousand, so it costs too much time and labor to check each cable manually; and such a method is unrealistic. So we propose the cable location system which can locate target cables by inputting pulse to the metallic shields or the conductors and detecting the pulse by electrostatic coupling. This system has communication facility using LAN on the transmitters and the receivers respectively, so it can locate the target cables automatically from a large amount of whole cables by connecting to personal computers. It is expected to reduce much time and labor for the location of unnecessary cables by this system.
[Key words] Cable Location, Electrostatic Coupling

Development of Insulation Techniques by Electrodeposition for Electronic Parts

Recently, narrower pitch arrangement of probe pin is required in the probe card due to higher integration of semiconductors. There have been some kinds of probe pins with insulation layer, however, the insulation layer formed with conventional dipping process has many problems, e.g., inhomogeneous thickness, poor reliability, etc. Mitsubishi Cable Industries has been manufacturing MEXCEL® that is the fine rectangular magnet wire with highly reliable insulation layer formed with electrodeposition technique for long years. And this firm electrodeposition technology has been successfully applied to form the heat resistant insulation layer on the probe pin with higher uniformity and reliability. In this paper, characteristics of the electrodeposited insulation layer on probe pin are introduced together with some examples of the application of the electrodeposition technique for the other electric parts.
[Key words] Electrodeposition, MEXCEL®, Polyimide, High Heat-resistance, Probe Pin

 MEXCEL is a registered trademark of Mitsubishi Cable Industries, Ltd. in Japan and other countries.

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