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Technology Now

Introduction to Technological/Product Trends in Mitsubishi Electric High-frequency/Optical Devices

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2 : Optical Communications Devices

High-speed data transmission for fiber-to-the-home (FTTH), intra-company networks (LANs) and data centers that process large amounts of data to and from Internet service providers. The major parts of the metro system, which connects these, and the core system that transmits those large amounts of information over long distances are built with transmission systems that utilize optical fibers.

Fig. 2.1 Optical communications system.

*18 SAN : Storage Area Network

These optical fiber transmission systems use different types of lasers. Fabry-Perot (FP) lasers require milder operating conditions, have a simple structure and are used when the transmission distance is relatively short. Distributed feedback (DFB) lasers have a higher emission spectral purity, which helps to reduce the transmission speed differences between wavelengths for long-distance transmissions. Electro-absorption modulator-integrated semiconductor lasers (EMLs) enable the wavelength variations caused by modulation to be eliminated, and are used for faster transmission over longer distances. Since the market debut of the world's first semiconductor laser in 1980, Mitsubishi Electric has been providing optical devices that support many domestic and international optical communications networks.

Fig. 2.2 Optical communications device applications.

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