Prysmian has filed a patent for a method of manufacturing a primary preform for optical fibers using an internal plasma chemical vapor deposition (PCVD) process. The method involves depositing silica layers on the inner surface of a hollow silica substrate tube by supplying glass-forming gases and creating a plasma reaction zone using microwave radiation. The patent also covers the formation of optical fibers using this method. GlobalData’s report on Prysmian gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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Method for manufacturing primary preform for optical fibers using pcvd
A recently filed patent (Publication Number: US20230312392A1) describes a method for manufacturing a primary preform for optical fibers using an internal plasma chemical vapor deposition (PCVD) process. The method involves depositing silica layers on the inner surface of a hollow silica substrate tube by supplying glass-forming gases to the tube's interior and creating a plasma reaction zone using microwave radiation.
One key aspect of the method is the decrease in microwave power during the deposition process. Claim 2 specifies that the microwave power is decreased by at least 5 percent, while claim 3 states that the decrease can be between 15 to 25 percent. The decrease in microwave power can be continuous, as mentioned in claim 4, and can occur during at least 50 percent or 75 percent of the deposition process, as stated in claims 5 and 6, respectively.
The decrease in microwave power can be achieved in multiple stages, as described in claim 7. The number of stages can range from two to six, as mentioned in claim 8. Each stage of microwave power decrease should have a duration of at least 10 percent or 20 percent of the total duration of the deposition process, according to claims 9 and 10. Additionally, claim 11 specifies that the degree of microwave power decrease in each stage should be larger than the preceding stage.
The patent also mentions different types of microwave power decrease, such as linear decrease (claim 12) and quadratic decrease (claim 13). The total flow rate of glass-forming gases supplied to the hollow substrate tube should be kept substantially constant during the deposition process (claim 14). The ratio between the microwave power and the total flow rate of glass-forming gases should decrease during the deposition process (claim 15).
The patent also includes claims related to the resulting primary preform and its subsequent treatment. Claim 17 states that the primary preform made using the described method is covered by the patent. After the PCVD process, the primary preform can undergo a collapsing treatment to form a solid primary preform (claim 18). The resulting solid primary preform can then be used to form an optical fiber by heating one end and drawing the fiber from that end (claim 20).
In summary, the patent describes a method for manufacturing a primary preform for optical fibers using an internal PCVD process with specific variations in microwave power during the deposition process. The resulting primary preform can be further treated to form a solid primary preform, which can then be used to create optical fibers.
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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
