A week in tech

A round up of the latest tech news.

Japan

- Fujitsu Ltd. has developed an all-silicon optical chip that can send and receive optical signals at a speed of 50 gigabits per second. Most optical semiconductors are now made using indium-phosphorus and other compound semiconductor materials. These chips already achieve speeds of 40-50 Gbps, but an all-silicon device is easier to integrate with arithmetic processors and memory as single-chip solutions for optical communications systems. Fujitsu's new all-silicon optical chip is 30% faster than similar chips made in the past. The company achieved this by shortening the length of the gate electrode to 45nm. Fujitsu expects the device to find use in 40 Gbps optical communications systems. The Japanese government designated seven...

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