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[DailyTech] IBM Manufactures Nanophotonics on 90 nm CMOS, Demos 25 GBPS Per Channel - Page 5

post #41 of 55
Quote:
Originally Posted by DuckieHo View Post

With SATA, PCIe, DDR4, etc, interconnects have moved to a high-frequency point-to-point topography. We have moved away from electrical buses because the shared signalling is hard to maintain at high frequency. Since light can be superpositioned, we can go back to a bus-like concept.... one interface that is shared by multiple devices.
Most implementations of buses are by interrupts (maybe by clock intervals?). With optical interconnects, each device can request a specific wavelength, frequency, or orthogonal frequency. As long as each device is using something different, they can all send signals down the same physical line.

This clarifies a lot for me, but I still don't understand how do you handle the physical complexity that comes from this. Does every optical processor just dump it's signals into one big cable? How small can you make a light emitter before it becomes challenging to modulate the signature? What do you put at the ends of the bus? Maybe I'm not schooled enough in fiber-optics.
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post #42 of 55
Thread Starter 
Quote:
Originally Posted by un-midas touch View Post

This clarifies a lot for me, but I still don't understand how do you handle the physical complexity that comes from this. Does every optical processor just dump it's signals into one big cable? How small can you make a light emitter before it becomes challenging to modulate the signature? What do you put at the ends of the bus? Maybe I'm not schooled enough in fiber-optics.

Yes, that's how fiber optics work today. You can make them pretty small... but they can be smaller and they still are too expensive. You place a detector.
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post #43 of 55
Quote:
Originally Posted by DuckieHo View Post

Yes, that's how fiber optics work today. You can make them pretty small... but they can be smaller and they still are too expensive. You place a detector.

It seems that way back when I first learned of optical I/O I envisioned a new language based on using colors as bits. For theory, instead of having "on" as 1 and "off" as 0, you would have 0,1,2,3,4,5,6,7 as white, red, orange, yellow, green, blue, indigo, violet forming a 64-bit word size. Processors would have 8 emitters, each firing (or not firing) in the sequence that outputs the value defined.

But of course this was just conjecture at the time. That being said, it offers a means to produce a signal without the need to modulate individual emitters. I assume the technology has moved beyond my initial perception of optical transmission.

Still, if the language allows it, I feel the time has come to move beyond 1 and 0...
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post #44 of 55
I think 90 nm might be a bit too small to properly modulate the signal. I would like to have an emitter with the size at least one wavelegth if we start talking about polarizing signals so you could use, say, two signals of the same frequency separated only by their polarization - however, for just emitting some photons with specific energy I think 90 nm might be quite adequate size if we are talking about very short distances - for longer distances I think one would need some kind of waveguide with size comparable to the wavelenth - which would be preferably larger than 400 nm to avoid issues with ionization - sure lower energy photons can ionize still by being absorbed in two or more photons at a time but the probability is a lot less.
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post #45 of 55
Quote:
Originally Posted by un-midas touch View Post

It seems that way back when I first learned of optical I/O I envisioned a new language based on using colors as bits. For theory, instead of having "on" as 1 and "off" as 0, you would have 0,1,2,3,4,5,6,7 as white, red, orange, yellow, green, blue, indigo, violet forming a 64-bit word size. Processors would have 8 emitters, each firing (or not firing) in the sequence that outputs the value defined.
But of course this was just conjecture at the time. That being said, it offers a means to produce a signal without the need to modulate individual emitters. I assume the technology has moved beyond my initial perception of optical transmission.
Still, if the language allows it, I feel the time has come to move beyond 1 and 0...

Wouldn't using colors be restricted to RGB? So you would actually only have three values.
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post #46 of 55
Quote:
Originally Posted by .:hybrid:. View Post

Wouldn't using colors be restricted to RGB? So you would actually only have three values.

How so? The light spectrum is huge. RGB is just the primary colors for additive color.
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post #47 of 55
Dudes I was like 17 and just starting a a 10-year marijuana habit when I thought it up. I was like, "1 and 0? That's all you get?"

From what I know now even if it was ever viable it would now be obsolete.
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post #48 of 55
Quote:
Originally Posted by .:hybrid:. View Post

Wouldn't using colors be restricted to RGB? So you would actually only have three values.
The primary color scheme is used to cheaply and effectively blend colors together to form our displays. These wires transfer photons (not nessarily visible light mostly infrared light is used) with different frequencies does and the receiver picks up the presence of a certain frequency. Thus information has traveled giving us the same result as if electrons had been passed.

Also to clarify for the non-electrical engineers quantum computing is using the quantum physics principle that an object can exist in two locations at the same time. This principle allows us to use as the number of locations as the digits of binary characters. With the extra digits we can have exponentially more efficient hardware(more words to do calculations in our simple language). The problem we have now is getting the particles to behave properly.

disclaimer: I had one lecture on this so I may be wrong
Edited by Feild Scarecrow - 12/16/12 at 8:48pm
post #49 of 55
Quote:
Originally Posted by un-midas touch View Post

Dudes I was like 17 and just starting a a 10-year marijuana habit when I thought it up. I was like, "1 and 0? That's all you get?"
From what I know now even if it was ever viable it would now be obsolete.

But we have built so much using binary and porting to a different base system is so much more complicated then utilizing say multiple physical cores. I doubt that this tech will be used for home users in the next 30 years as we already have too much power.
post #50 of 55
Quote:
Originally Posted by Feild Scarecrow View Post

But we have built so much using binary and porting to a different base system is so much more complicated then utilizing say multiple physical cores. I doubt that this tech will be used for home users in the next 30 years as we already have too much power.

You are right in all practicality. But my ears hear, "too big to fail." If quantum computing, which is not only a different base system but probably the most bizarre base system ever taken on by the collective mind of programming, then it stands to say that it is not without merit to explore other bases.

But yea, they're probably not gonna give us much more power...
Edited by un-midas touch - 12/16/12 at 9:08pm
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