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High tech LED Comprehensive ReportProfessor Katsuyuki Utaka and others from Waseda University in Japan, with the assistance of Hitachi, have developed high-performance compound semiconductors that can distribute optical communication signals at ultra-high speedsOptical switch.The group is working hard to study the construction of components to prevent performance degradation caused by polarization. By mid-2010, it is expected to become a key component for high-capacity optical networks.

Optical communication is a switching technology that distributes signals transmitted through optical fibers according to the object. Based on the existingoptical switchIn terms of allocation, it takes several milliseconds to several microseconds; The future high-speed communication is required to be shortened to the level of a few nanoseconds. The research team has developed a simple switch for distributing input signals using compound semiconductors, InAlGaAs, and other materials suitable for controlling high-speed signals and miniaturization. The substrate material is provided by Hitachi. Specifically, if the optical signal splits into two paths and only electrons are injected from the electrode on a single path, the direction of light propagation will deviate. Re overlap and aggregate these lights so that they can only output signals in the desired direction.

Traditional semiconductor switches can cause a decrease in output signal quality due to the polarization of the input light; Professor Yu Gao and others have delved deeper into a portion of semiconductors and put in effort to study the design of switches to reduce the impact of polarization. No matter how the light vibrates in the vertical or horizontal direction, it can be distributed with high precision. It is said that the allocated time has also been significantly reduced to about 3 nanoseconds.

Using the new switch, the power required to control the signal is about 5mW, which is less than 1/10 of the original. In the future, even if the amount of information in optical networks increases, it is expected that the power consumption of information machines, communication networks, etc. can also be controlled. The research team will continue to study and improve to prevent the attenuation of optical signals caused by switches, and is expected to put it into practical use around 2010.
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