Yokogawa Electric Corporation announced that it has developed 4-to-1 multiplexer and 1-to-4 demultiplexer modules for optical transmission systems. Both modules are available in two types: a connector type for integration into equipment for measurement and development, and a ceramic package type for commercial communication equipment. The ceramic package type module based on HBT (Hetero-junction Bipolar Transistor), which relies on a compound semiconductor not suitable for high-density designs, is the first Japanese module small enough to be successfully installed on a board. Yokogawa began delivering the connector type module from February 2002. The ceramic package type module released on April 2002.

Overview

By combining the functions of three of the 2-to-1 multiplexer and 1-to-2 demultiplexer modules we launched in September 2001, 10-Gbps signals can be converted into a 40-Gbps output. The new 4-to-1 multiplexer and 1-to-4 demultiplexer modules are smaller than their predecessors but boast the functions of 10 separate modules including 2-to-1 multiplexer and 1-to-2 demultiplexer modules, flip-flop modules that retime waveforms, and others. The ceramic package type module not only offers the functions of 10 modules but also has a volumetric capacity which is only a quarter that of the 2-to-1 multiplexer.

"Practical use of the 40-Gbps optical transmission systems currently being developed, requires signal multiplexer and modulator modules that can operate at 40 Gbps or faster and are small enough to be successfully installed on a board," said Mamoru Sanagi, Senior Vice President of T&M Business Division. "So far, almost no one has been successful in downsizing modules that can work at very high frequency rates because of the highly advanced device technologies it requires. Yokogawa overcame this difficulty and is ready to commercialize the new modules, which were made possible by approximately 20 years of experience in developing compound semiconductor technologies."

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