Spectrum of High-OH Fiber from 1.5 to 1.7 Microns
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Posted by John M. Jarvis on February 22, 2007, 7:03 pm
Please log in for more thread options wavelengths beyond the 1.4 micron? It seems that the fiber vendors don't normally publish such information any longer. I have a sensor application that will utilize a meter or so of high-OH fiber in the region from 1.55 to 1.7 microns and I'm looking to see what the attenuation might be. Sincerely, John M. Jarvis, Ph.D. | |||||||||||||||||||
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Posted by Marvin on February 23, 2007, 11:25 am
Please log in for more thread options found that the transmission was poor at certain wavelengths. It was soon found that the cause was trace amounts of water in the fibers. The 1.55 to 1.7 micron range includes the first overtone of the O-H stretching vibration. | |||||||||||||||||||
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Posted by John M. Jarvis on February 23, 2007, 10:52 pm
Please log in for more thread options Hi Marvin --
Thanks for the reply. I understand that fiber attenuates fairly strongly for telecomms applications. My application is for a sensor however. I don't need to transmit data for kilometers; I need to transmit only 2 meters. I'm currious if I can get 90% transmission or so out of a 2 meter standard high-OH fiber. Also, as I understand, the primary OH absorption should occur at 1.4 micrometer. I think there should be somewhat of a window between the 1.4 micron overtone and the 2.8 fundamental OH absorptions. I suspect that the wings of the two absorptions might overlap so that the attenuation would be higher than usable for telecoms but maybe not for a sensor. Sincerely, John > John M. Jarvis wrote:
>> Can someone point me to a spectrum for high-OH silica-silica fiber at
>> wavelengths beyond the 1.4 micron? >> >> It seems that the fiber vendors don't normally publish such information >> any >> longer. >> >> I have a sensor application that will utilize a meter or so of high-OH >> fiber >> in the region from 1.55 to 1.7 microns and I'm looking to see what the >> attenuation might be. >> >> Sincerely, >> >> John M. Jarvis, Ph.D. > In the early days of fiber optics for communications, it was found that
> the transmission was poor at certain wavelengths. It was soon found that > the cause was trace amounts of water in the fibers. The 1.55 to 1.7 micron > range includes the first overtone of the O-H stretching vibration. | |||||||||||||||||||
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Posted by Marvin on February 24, 2007, 12:31 pm
Please log in for more thread options John M. Jarvis wrote:
> Hi Marvin --
You are right, but I don't have specifics for particular
> > Thanks for the reply. > > I understand that fiber attenuates fairly strongly for telecomms > applications. My application is for a sensor however. I don't need to > transmit data for kilometers; I need to transmit only 2 meters. I'm > currious if I can get 90% transmission or so out of a 2 meter standard > high-OH fiber. > > Also, as I understand, the primary OH absorption should occur at 1.4 > micrometer. I think there should be somewhat of a window between the 1.4 > micron overtone and the 2.8 fundamental OH absorptions. I suspect that the > wings of the two absorptions might overlap so that the attenuation would be > higher than usable for telecoms but maybe not for a sensor. > > Sincerely, > > fibers. The makers might not bother to make measurements in that wavelength range. Perhaps you can get samples? | |||||||||||||||||||
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Posted by Alessandro on February 26, 2007, 4:51 am
Please log in for more thread options John M. Jarvis wrote:
> I understand that fiber attenuates fairly strongly for telecomms
> applications. My application is for a sensor however. I don't need to > transmit data for kilometers; I need to transmit only 2 meters. I'm > currious if I can get 90% transmission or so out of a 2 meter standard > high-OH fiber. > > Also, as I understand, the primary OH absorption should occur at 1.4 > micrometer. I think there should be somewhat of a window between the 1.4 > micron overtone and the 2.8 fundamental OH absorptions. I suspect that the > wings of the two absorptions might overlap so that the attenuation would be > higher than usable for telecoms but maybe not for a sensor. Water has bbsorption lines at 1.2, 1.4, 1.9 and 2.4 µm (out of my memories). The attenuation at 1.6 is of the order of 1db/Km, at i.4 of 3 db/Km (this comes from a very old booklet of AMP. The attenuation increases sharply when moving towards IR. I would say that the wavelength you need will be a critical parameter to decide if you can use a high OH fiber. Keep in mind that OH bands are sensitive to the temperature with considerable wavelengths shifts. So, for a sensor application where the signal stability is an important parameter I would stick to low OH fibers independently from the attenuation. Cheers, Alessandro -- Dio di misericordia il tuo bel Paradiso lo hai fatto soprattutto per chi non ha sorriso per quelli che han vissuto con la coscienza pura l'inferno esiste solo per chi ne ha paura. | |||||||||||||||||||
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> wavelengths beyond the 1.4 micron?
>
> It seems that the fiber vendors don't normally publish such information any
> longer.
>
> I have a sensor application that will utilize a meter or so of high-OH fiber
> in the region from 1.55 to 1.7 microns and I'm looking to see what the
> attenuation might be.
>
> Sincerely,
>
> John M. Jarvis, Ph.D.
>
>