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Ethiopian among IBM Scientists who Created Ultra-Fast Device which uses light



  04:31:27 am, by admin   , 888 words  
Categories: Ethiopia

Ethiopian among IBM Scientists who Created Ultra-Fast Device which uses light

IBM Scientists Fengnian Xia, Yurii Vlasov and Solomon Assefa unveiled a significant step towards replacing electrical signals that communicate via copper wires (Photo: IBM)

Ethiopian among IBM Scientists who Created Ultra-Fast Device which uses light

IBM Scientists Create Ultra-Fast Device Which Uses Light for Communication between Computer Chips

Source: IBM

Yorktown Heights, NY - 03 Mar 2010: IBM (NYSE: IBM) scientists today unveiled a significant step towards replacing electrical signals that communicate via copper wires between computer chips with tiny silicon circuits that communicate using pulses of light. As reported in the recent issue of the scientific journal Nature, this is an important advancement in changing the way computer chips talk to each other.

The device, called a nanophotonic avalanche photodetector, is the fastest of its kind and could enable breakthroughs in energy-efficient computing that can have significant implications for the future of electronics.

The IBM device explores the “avalanche effect” in Germanium, a material currently used in production of microprocessor chips. Analogous to a snow avalanche on a steep mountain slope, an incoming light pulse initially frees just a few charge carriers which in turn free others until the original signal is amplified many times. Conventional avalanche photodetectors are not able to detect fast optical signals because the avalanche builds slowly.

“This invention brings the vision of on-chip optical interconnections much closer to reality,” said Dr. T.C. Chen, vice president, Science and Technology, IBM Research. “With optical communications embedded into the processor chips, the prospect of building power-efficient computer systems with performance at the Exaflop level might not be a very distant future.”

The avalanche photodetector demonstrated by IBM is the world’s fastest device of its kind. It can receive optical information signals at 40Gbps (billion bits per second) and simultaneously multiply them tenfold. Moreover, the device operates with just a 1.5V voltage supply, 20 times smaller than previous demonstrations. Thus many of these tiny communication devices could potentially be powered by just a small AA-size battery, while traditional avalanche photodetectors require 20-30V power supplies.

“This dramatic improvement in performance is the result of manipulating the optical and electrical properties at the scale of just a few tens of atoms to achieve performance well beyond accepted boundaries,” said Dr. Assefa, the lead author on the paper. “These tiny devices are capable of detecting very weak pulses of light and amplifying them with unprecedented bandwidth and minimal addition of unwanted noise.”

In IBM’s device, the avalanche multiplication takes place within just a few tens of nanometers (one-thousandths of a millimeter) and that happens very fast. The tiny size also means that multiplication noise is suppressed by 50% - 70% with respect to conventional avalanche photodetectors. The IBM device is made of Silicon and Germanium, the materials already widely used in production of microprocessor chips. Moreover it is made with standard processes used in chip manufacturing. Thus, thousands of these devices can be built side-by-side with silicon transistors for high-bandwidth on-chip optical communications.

The Avalanche Photodetector achievement, which is the last in a series of prior reports from IBM Research, is the last piece of the puzzle that completes the development of the “nanophotonics toolbox” of devices necessary to build the on-chip interconnects.

In December 2006, IBM scientists demonstrated silicon nanophotonic delay line that was used to buffer over a byte of information encoded in optical pulses - a requirement for building optical buffers for on-chip optical communications.

In December 2007, IBM scientists announced the development of an ultra-compact silicon electro-optic modulator, which converts electrical signals into the light pulses, a prerequisite for enabling on-chip optical communications.

In March 2008, IBM scientists announced the world’s tiniest nanophotonic switch for “directing traffic” in on-chip optical communications, ensuring that optical messages can be efficiently routed .

The report of this work, entitled “Reinventing Germanium Avalanche Photodetector for Nanophotonic On-chip Optical Interconnects,” by Solomon Assefa, Fengnian Xia, and Yurii Vlasov of IBM’s T.J. Watson Research Center in Yorktown Heights, N.Y. is published in the March 2010 issue of the scientific journal Nature.

IBM has a long history of pioneering advanced silicon technologies to help enhance performance, while reducing size and power consumption. Such advances include the development of the world’s first copper-based microprocessor; silicon-on-insulator (SOI), a technology that reduces power consumption and increases performance by helping insulate the millions of transistors on a chip; and strained silicon, a technology that “stretches” material inside the silicon decreasing the resistance and speeding the flow of electrons through transistors.

Further information can be found at the following link:



About Solomon Assefa

Source: IBM

Dr. Solomon Assefa joined the IBM Thomas J. Watson Research Center in 2004. His research interests include Si nanophotonics integration with CMOS for optical communications, ultra-compact and highly efficient photodetectors, avalanche amplification, slow-light engineering for buffering application, low-power optical switches, and electrically-activated photonic-crystal devices for low-power switches/modulators and novel applications including biosensing. He has also explored magnetic random access memory (MRAM) and spin-torque memory device integration.

He received a B.S. degree in physics, as well as B.S. and M.S. degrees in electrical engineering and computer science (EECS) in 2001 from MIT. Then, he received a Ph.D. degree from MIT in June 2004 for his research on novel passive and active photonic-crystal devices on III–V and Si-based platforms. He was born in Addis Ababa, Ethiopia.


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Comment from: dj [Visitor]

I am proud of dr. sol

03/07/10 @ 04:56
Comment from: Abdi [Visitor]

Finally! I have had this idea for a long time and I used to brag about it to friends but they just … :lalala: Basically, it’s like fibre-optic at the micron level |-| (much more difficult). This is the steppingstone before quantum computers become available to the masses. Computer using photon chips will be so fast however, we the average person may never need a quantum computer, but you never know, maybe there will ULTRA-EMMERSIVE 3D PORTALS you can have at home, which will require massive amounts of computing power. :) Anyway, props to this dude!

03/07/10 @ 05:03
Comment from: andualemfelate [Visitor]

Dr solomen you are ethiopian i am proud jens.
Computer using photon chips will be so fast however, we the average person may never need a quantum computer, but you never know, maybe have moor caming soon ??????

03/07/10 @ 05:52
Comment from: DaMan [Visitor]

Mr. Assefa, You are the man. Keep Ethiopia in your side, like to read good news like this now and then…

03/07/10 @ 05:52
Comment from: abebe [Visitor]

wow congradulation Dr.solomon we need more of like you let be your knowledege produce more scholars to Ethiopia.share your knowledge to that countries poor technology if conditions allow u. let God bless Ethiopia ,USA &Israil

03/07/10 @ 06:07
Comment from: P, O [Visitor]
P, O

A great Example to Fellow Ethiopians ,education and hard works pays at the end .proud to be Ethiopian.

03/07/10 @ 06:07
Comment from: Seleme [Visitor]

. . .we proud with you Bro. . .

03/07/10 @ 06:27
Comment from: Belay [Visitor]

I am glad to here this from a fellow African. I will be one of the great success in nanophotonics and optical communication.

keep on such scientifical achivements!

03/07/10 @ 06:34
Comment from: mamo [Visitor]

I proud of U Bro but all dureye diaspora bye chefera betu kemetezori tekereshe beteseri yete enderese nebere … kochene . . . . singing

03/07/10 @ 06:37
Comment from: Uzawa [Visitor]

This makes one of my best days. Such stories are elating and uplifting. I am immensely proud of you dr solomon. best of luck in your future endeavor!


03/07/10 @ 07:16
Comment from: st.ermisha [Visitor]

Us usual, now we have something to be proud, something to boast for the next 100 years , instead of doing something worth like dr. solomon!!
achebchabi bicha!!

03/07/10 @ 07:34
Comment from: Yonas Bekele [Visitor]
Yonas Bekele

MAJOR KUDOS to Dr. Solomon, you are an inspiration to us and our children.

03/07/10 @ 07:44
Comment from: ethiopian kid [Visitor]
ethiopian kid

Dear Dr. Solomon

We are all proud of you with your work and educational bio. Great work. We need more Ethiopians like you..

May God bless

03/07/10 @ 09:14
Comment from: ankober [Visitor]

Hey doc.
thank you thank you very much.while fellow scholars(like almariam)are talking the whole day like an old woman,you the true son of ethiopia are making history.please dont forget mama ethiopia and avoid toxic scholars like almariam

03/07/10 @ 09:46
Comment from: sami [Visitor]

guys why you become proud of him it is ashame be proud of your work only.
IT IS a parasite thinking.

03/07/10 @ 09:46

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