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Technology Now

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

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2.1 : Semiconductor Lasers for FTTH

Fiber-to-the-home (FTTH) requires the use of DFB lasers because of their higher optical output and excellent temperature properties. The signals from telephone exchanges are branched into 32 segments and distributed to subscribers up to 20km away.

Mitsubishi Electric is supporting FTTH worldwide with its highly reliable avalanche photo diode (APD) laser. This laser is the culmination of excellent epitaxial and processing technologies developed over the years, combined to provide high efficiency and high optical output. The company is currently progressing with the development of devices necessary for the next-generation of FTTH.

Fig. 2.3 Optical devices supporting FTTH systems.

*19 10G-PON : 10Gigabit Passive Optical Network
*20 G-PON : Gigabit Passive Optical Network
*21 GE-PON : Gigabit Ethernet-Passive Optical Network
*22 B-PON : Broadband Passive Optical Network

2.2 : Semiconductor Lasers for Metro/Main Systems

Communication traffic keeps growing as demand for movie distribution on the Internet increases. Improving the transmission speed of devices enables the power consumption per unit of information to be reduced. Mitsubishi Electric is contributing to speeding up optical communications networks; for example, by introduction of a 43Gbps EML module/PD preamplifier module with a built-in driver. This was made possible through the actualization of a high-speed integrated modulator laser and a waveguide light-receiving element, both pioneering developments in the industry.

A semiconductor laser that is to be used as a light source in high-speed optical communications systems will first be utilized for controlling the temperature of a cooled device owning to its temperature-sensitive characteristics. Mitsubishi Electric continues to maintain its position as a pioneer in the industry after developing and producing a device that has a wider operating range, yet still has excellent properties as an uncooled device. This helps to eliminate temperature control requirements for devices, and greatly reduces the power consumption of equipment used in communications networks and data centers that process large amounts of information.

Fig. 2.4 Optical devices supporting metro and main systems.

*23 MZM : Mach-Zehnder Modulator
*24 TOSA : Transmitter Optical SubAssembly

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