MUMBAI, India, Nov. 14 -- Intellectual Property India has published a patent application (202547097201 A) filed by Sumitomo Electric Industries, Ltd., Osaka, Japan, on Oct. 8, for 'method for manufacturing multicore optical fiber and multicore optical fiber preform.'
Inventor(s) include Nagashima Takuji; and Nomura Takahiro.
The application for the patent was published on Nov. 14, under issue no. 46/2025.
According to the abstract released by the Intellectual Property India: "This method for manufacturing a multicore optical fiber includes: a step for inserting multiple glass rods into multiple holes provided in a glass tube; a step for sealing a first end of the glass tube; and a step for decompressing the inside of the multiple holes from a second end of the glass tube and drawing the glass tube and the multiple glass rods while integrating same. When the cross-sectional area of the glass tube before the drawing step is defined as S1 [m2], the sum of the cross-sectional areas of the multiple glass rods before the drawing step is defined as S2 [m2], and the cross-sectional area of the multicore optical fiber after the drawing step is defined as S3 [m2], the inserting step is carried out so that the sum of the areas of gaps between the glass tube and the multiple glass rods before the drawing step in a cross-section orthogonal to the axial direction of the glass tube is equal to or less than (S1 + S2)/S3 5.66 10-4 [mm2], and the inserting step is carried out in an environment having cleanliness higher than class 1,000."
The patent application was internationally filed on Feb. 14, 2024, under International application No.PCT/JP2024/005020.
Disclaimer: Curated by HT Syndication.
