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Purified quartz powder modified for cladding optic fiber cable

Inactive Publication Date: 2017-05-04
SIBELCO NORTH AMERICA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a novel method for improving the properties of commercial quartz powder used in optic fiber cables. The method involves coating the powder with additional lithium using a blending process, followed by a high-temperature gas treatment to convert the lithium into a solid solution in the quartz powder. The resulting powder has significantly reduced attenuation values, making it better suited for use in optic fiber cables. The preferred embodiment uses lithium nitrate as the doping agent, but other compounds like lithium carbonate and lithium chloride have also been successfully used. The gassing temperature is controlled at 1,250°C, and the doping agent can include aluminum nitrate or lithium aluminate, with or without aluminum nitrate. Aluminum has been shown to enhance the lithium doping action.

Problems solved by technology

Lesser amounts of lithium were lost while doping the new powder when aluminum was in the doping solution.

Method used

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  • Purified quartz powder modified for cladding optic fiber cable
  • Purified quartz powder modified for cladding optic fiber cable

Examples

Experimental program
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Effect test

example 1

[0026]The blended mass of powder had 1 ppm lithium and was gassed by AHCI at 1250° C. to give a solid solution lithium level in the final product of 0.823 ppm. The attenuation was reduced to a level below 0.187 dB / km.

example 2

[0027]The blended mass of powder had 0.83 ppm lithium and was gassed by AHCI at 1250° C. to give a solid solution lithium level in the final product of 0.665, which conforms to the desired targeted level. Example 2 was tested and found the attenuation was 0.183 dB / km. This constitutes the primary object of the invention to decrease the attenuation by using high lithium and preferably an attenuation level less than 0.184 dB / km.

[0028]Broadly the added lithium of the invention is an improvement because it reduces the attenuation obtained when purified quartz is used as cladding of optic fiber cable over prior art purified quartz powder. Example 1 was acceptable for improving commercial purified quartz powder for cladding. However, Example 1 was determined to be near the upper limit of the solid solution level to accomplish the inventive improvement of purified quartz powder for the fiber optic industry. Example 2 was preferred because it reduced the lower attenuation of the invention t...

example 3

[0030]This example was formulated by suing Li2CO3 from supply 46. It was determined that if the preferred maximum amount of total lithium in the blended mass of powder from station 14, i.e. 1.0 ppm, doping by gassing 70 of method 10 resulted in the final solid solution of lithium to about 0.4 ppm which, is less than the lithium level of the present invention. Consequently, more lithium carbonate doping agent is needed to practice the invention. It is less efficient in its doping action. It was found that LiCl from supply 42 performed as Example 3. Consequently, testing to obtain the lithium level of the invention established that lithium nitrate from supply 44 is preferred, the other similar doping agents from supplies 42 and 46 required higher levels of lithium at station 14.

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Abstract

A highly purified quartz powder having a low level of naturally occurring lithium modified for cladding a fiber optic cable, said modified quartz powder having an increased total amount of lithium in solid solution in said powder, said increased total amount being in the range of more than 0.50 ppm and less than 1.00 ppm and a method of modifying an highly purified quartz powder to make the same.

Description

[0001]This application claims priority to provisional patent application Ser. No. 62 / 250,579 filed on Nov. 4, 2015 which is incorporated by reference herein.[0002]The present invention relates to the highly purified natural quartz powder industry and more specifically to a modification of commercially available purified quartz powder that is specifically modified for improving the cladding of optic fiber cable and the method of making this new modified highly purified quartz powder.BACKGROUND OF THE INVENTION[0003]In making optic fiber cable, a cladding is used around the central core for protecting and improving the operation of the optic signal passing through the cable. Significant efforts have been made to optimize the physical and operating characteristics of the cladding beyond its general purpose of protecting the core of the cable. In the past, the cladding has been made by various materials, such as quartz powder which are highly purified to drastically reduce impurities oc...

Claims

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Application Information

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IPC IPC(8): C03C13/04C03C23/00
CPCC03C13/045C03C2213/00C03C23/0095C04B35/14C04B2235/3203C04B2235/72C04B2235/96C03C25/1068C04B35/62805C04B35/62813C04B2235/3217C04B2235/3418C04B2235/442C04B2235/443C03C25/007
Inventor CALDERONE, PAULMOSHER, BRIANCAPOBIANCO, CHRIS
Owner SIBELCO NORTH AMERICA INC
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