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Technology Stocks : LUMM - Lumenon Innovative Lightwave Technology Inc. -- Ignore unavailable to you. Want to Upgrade?

To: fibrehound* who wrote (1744)	5/11/2000 11:43:00 AM
From: fibrehound*	Read Replies (1) \| Respond to of 2484

You might want to pay for this abstract it will also give you a clue to how the O-H C-H problem is tightened. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Clip from abstract: As with UV induced densification, polymerization of the methacrylate groups by photoinitiation with visible light triggers further polycondensation reactions between unconverted$EQV@Si-OCH$-3$/ and $EQV@Si-OH to tighten the glass matrix. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ So it appears that UV light may be part of your answer also. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Full CLIP: Paper #: 3469-12 Light-induced densification and mechanisms in hybrid sol-gel glasses for photonic devices, pp.79-87 Author(s): Mark P. Andrews, McGill Univ., Montreal, QC, Canada; K.Saravanamuttu, McGill Univ., Montreal, QC, Canada; S. Iraj Najafi, Ecole Polytechnique de Montreal, Saint-Laurent, QC, Canada. Abstract: We give an account of the use of in situ waveguide Raman spectroscopy to provide vibrational information about structural changes that occur when a hybrid organically modified silicate glass is irradiated with UV or visible photons. The method is useful for 'reading' what transpires in an optical waveguide device as it is being formed by photoinscription methods. We describe a novel method for photoinscribing a circular (d equals 10 micrometer) optical fiber core on a SiO$-2$/-coated Si wafer. This is achieved by photolysis of a visible light photoinitiator in a slab waveguide while a standing wave is established in the film with the 514.5 nm TE$-0$/ mode of an argon ion laser. Simultaneous waveguide Raman spectroscopy (WRS) gave insight into structural changes in the matrix that ensue when the matrix is irradiated. As with UV induced densification, polymerization of the methacrylate groups by photoinitiation with visible light triggers further polycondensation reactions between unconverted $EQV@Si-OCH$-3$/ and $EQV@Si-OH to tighten the glass matrix.

To: fibrehound* who wrote (1744)	5/12/2000 3:44:00 AM
From: greeze	Read Replies (1) \| Respond to of 2484

fiberhound What am I to make of all these very impressive academic papers? Do you think they prove anything? I can probably find an academic paper that will prove almost anything is possible and will change the world. Oh, and by the way look at the following quote from your article in post #1744: Cocondensed and copolymerized materials show low optical losses of 0.12 dB/cm at 1300 nm and 0.33 dB/cm at 1550 nm. It has two key points. The loss at 1300 nm is about a factor of three less than at 1550 nm. This is what I reported in my previous post that was one of the problems with Sol Gel. This shows that O-H and C-H are still present. 1550 nm is the wavelength of light used for telecommunications. Another point is that at 1550 nm the loss in Sol Gel is .33dB. This is too high. The glasses used in optical chips made by PIRI, NEL, and Lucent all have losses of less than .05 dB/cm. Lumenon needs to get the loss of Sol Gel down to this level to make competitive DWDM devices (at 1550 not 1300). I hope Lumenon did not reference you to this article since it only proves what I said. You found this on your own, right? Greeze