January 1975
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8 Reads
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9 Citations
Journal of Solid State Chemistry
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Publications (3)
May 1973
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64 Reads
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260 Citations
The fabrication of an extremely‐low‐loss glass optical waveguide, having as little as 4 dB/km total attenuation, has allowed interpretation of the absorption spectrum to a much greater degree than previously possible. It is shown that, beyond about 700 nm, intrinsic ultraviolet absorption will have no effect. Between 700 and 1100 nm, all absorption can be accounted for on the basis of OH to within ±0.7 dB/km. Marked reduction of the water content will leave the scattering as the major loss mechanism, thereby permitting total attenuations of about 2 dB/km.
October 1972
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17 Reads
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63 Citations
Glass optical waveguides show great promise of being the transmission medium for optical communication links. Single‐mode waveguides have already been reported having a total attenuation of less than 20 dB/km. In this work we report measurements on the first low‐loss multimode glass waveguide. These measurements include both total attenuation as a function of wavelength and total radiation attenuation at 632.8 nm. Total attenuation as low as 7 dB/km was observed near 1060 nm. This is due in part to fabrication techniques which diminished the OH concentration in the glass. A total radiation loss of 12.3 dB/km was measured that is higher than that predicted solely by Rayleigh scattering.
Citations (3)
... Thus, its improvement in reliable manner is necessary to make it suitable for different applications. The different methods used for modification of OF are chemical vapor deposition (CVD), dip coating, thermal annealing and plasma processing techniques [26][27][28][29]. Although, several improvements have been reported but the optimization of refractive index profile is required. ...
- Citing Article
January 1975
Journal of Solid State Chemistry
... O PTICAL fiber possesses a number of unique advantages over other transmission media that include small size, light weight, low transmission loss and immunity to interference from electromagnetic fields. Since the first low loss optical silica fiber was proposed in 1960s and fabricated in the 1970s [1]- [3], the technology has witnessed a wide range of research driven innovations and developments, with a particular focus on applications in communications and sens-ing. Typically an optical fiber has high refractive index (RI) core surrounded by a lower RI cladding region. ...
- Citing Article
May 1973
... While this is today considered an intrinsic property of the glass, it is only so because extrinsic sources of loss, and therefore heat, have been removed. Transition metal impurities, specifically, Cu and Fe, play the most consequential roles at communication wavelengths, which had been established in the 1970s [5,6]. To remove these extrinsic absorbers, thermodynamics in the form of vapor pressure difference between the glass (e.g., SiCl4) and impurity (e.g., Fe2Cl6) precursors was employed with immediate impact. ...
- Citing Article
October 1972