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Sunday, September 18, 2011
Fujitsu Develops Compact Silicon Photonics Light Source for High-Bandwidth CPU Interconnects

Fujitsu Laboratories Limited announced the development of a compact silicon photonics light source for use in optical transceivers required for optical interconnects capable of carrying large volumes of data at high speeds between CPUs.

In the past, when the silicon photonics light sources built into optical transceivers, and the optical modulators that encode data into the light emitted from the light source experienced thermal fluctuations, a mismatch between the lasing wavelength of the light source and the operating wavelength of the modulator could arise, causing concern that the light would not carry information. This is why thermal control has become indispensable as a way to maintain operating wavelengths that consistently match. By introducing a mechanism that automatically keeps the light source's wavelength and the modulator's operating wavelength in sync, Fujitsu Laboratories has obviated the need for a thermal control mechanism, allowing for the device to be smaller and more energy efficient.

This technology enables compact, low-power optical transceivers to be mounted directly in CPU packaging. Through its application to optical interconnects between CPUs for exaflops-class supercomputers and high-end servers, the technology paves the way for super-high-speed computers.

Details of this technology were presented at the 8th Group IV Photonics international conference (GFP 2011), running September 14-16 in London. Background

Fujitsu Laboratories plans to continue the development of optical transceivers for large-capacity interconnects by integrating this light source technology.

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