IBM slows flow of light to accelerate silicon chips

Yorktown Heights (NY) - IBM researchers announced that they have developed a device that is capable of delaying the flow of light on a silicon chip, which is considered a critical milestone in creating silicon chips that leverage optical communications to achieve better performance. Photonics have been viewed as key technology to accelerate future chips for some time, as light signals are able to transfer more data at faster pace than electrical signals. However, controlling the speed of light, which includes temporarily holding light signals, is critical for such devices and still a difficult task for researchers. IBM claims to have developed a device capable of "buffering" light in a device small enough to fit on a silicon chip.

IBM said that its scientists were able to meet this size restriction and achieve the necessary level of control of the light signal by passing it through a "new form" of silicon-based optical delay line built of up to 100 cascaded "micro-ring resonators."

According to IBM, the micro-ring resonators were built using a common complementary metal-oxide-semiconductor (CMOS) fabrication tools. IBM hopes that the new device could lead the way to on-chip integration of compact nano-photonic circuits for manipulating the light signals - similar to the manipulation of electrical signals in today's silicon chips. The fact that IBM was able to use a common CMOS fabrication line could indicates that cheap mass production of densely integrated optoelectronic chips comprising both photonic and electronic circuitry could be possible in the foreseeable future.

Intel's hybrid chip employs 36 lasers and 36 modulators on one die as well as a multiplexor to route light beams with varying wavelengths through optical fiber. Each laser is about 1 micron wide and 800 microns long, which compares to the width of a human hair of about 100 microns. Intel aims to combine the platform with a data receiver chip to build an integrated silicon photonic chip, which could be used on computer boards and serve as interconnect between busses, between PCs and networks.

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