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Technology Stocks : JDS Uniphase (JDSU) -- Ignore unavailable to you. Want to Upgrade?

To: TigerPaw who wrote (6131)	2/9/2000 4:09:00 AM
From: Rick McDougall	Read Replies (2) \| Respond to of 24042

Thieved from the Motley Fool. Author: FrozenCanuck Number: of 6713 Subject: Let's get serious: INTERLEAVER TECHNOLOGY Date: 2/7/00 8:55 AM Email this to a Friend Format for Printing Post New ? Post Reply ? Reply Later Problem Post ? Recommend it! Recommendations: 45 Hello to all the people on this board who are actually interested in analyzing it rather than arguing about price movements, technical analysis crap and stock splits. I want to discuss interleaver technology. I don't want to explain YET why I feel this is so important, but suffice to say that I see interleavers as a KEY technology for any company competing in the DWDM market. Ok - let's talk. What is an INTERLEAVER? Well, first you need to understand what channel spacing is. Most systems have been deployed using 200GHz channel spacing, which means that each laser colour travelling down the fiber is separated by a frequency of 200GHz. Maybe this would make more senst to convert into wavelength. 200GHz is 1.6 nanometers. They are related by the universal wave equation (velocity = frequency x wavelength) "Old" DWDM systems (ie, 200GHz) are being replaced with "New" systems at 100GHz, and probably we will see push for 50GHz soon. This means the spacing between laser colours is getting narrower (ie, lanes of the highway are smaller. In case you didn't ever see the highway analogy, here it is again for you: LANES on the highway are like the ITU grid for frequencies. Thes are the RULES. You have to drive in the lane, and everybody agrees that the white line separates lanes. Going from 200 to 100GHz is like shrinking the lane in half, so you can fit twice as many cars on the highway. CARS are like laser pulses. They have to be small enough to fit in the lane (this is their spectral width). DWDM devices put cars into the correct lanes. Now what about interleavers? Oh yah. Back to our story. So, imagine that you want to cram more cars down the highway, but you don't want to dish out more money for expensive 100GHz filters. Instead, you want to use "cheap" 200GHz stuff. To do this you use an interleaver. Here is what happens: you have two sets of signals coming in, on the same frequency spacing, at 200GHz. One set of signals is offset by 100GHz and then they are both mixed together. Now you have 100GHz spacing. So, these are valueable devices. Whenever somebody makes 100GHz filters cheap enough, then we can use interleavers to achieve 50GHz spacing. Then we can use them to get 25GHz spacing, etc. Who controls this technology? Who understands how it works? This is where my knowledge falls apart. I know that JDSU sells interleavers, and I suspect some other companies do as well. Anybody have some insight here? It would be a valueable discussion. BTW if it gets to drowned out in all of the noise, let's move it over to Fiberhead Friends. Chris