Changfei Optical Fiber applies for patents related to the fabrication of few-mode optical fibers, inventing few-mode optical fibers that can achieve extremely low differential mode group delay.

April 2 News, the State Intellectual Property Office’s information shows that Changfei Optical Fiber and Cable Co., Ltd. has applied for a patent titled “An Ultra-Low Differential Mode Group Delay Few-Mode Fiber and Its Manufacturing Method.” The application publication number is CN121763487A, the application number is CN202610219313.9, the publication date is March 31, 2026, the filing date is February 24, 2026. Inventors include Xu Shuo, Zhang Li, Shen Lei, Zhang Lei, Yang Liubo, Wang Jia, and Roger. The patent agency is Wuhan Kehao Intellectual Property Agency (Special Partnership), patent agent Hu Qiyi. The classification codes are G02B6/028 and G02B6/036.

The patent abstract indicates that the invention belongs to the field of few-mode fiber technology, disclosing an ultra-low differential mode group delay few-mode fiber and its manufacturing method. The ultra-low differential mode group delay few-mode fiber provided by the invention includes a core layer structure, an inner cladding structure, and an outer cladding layer from inside to outside; the core layer structure includes a first core layer and a second core layer from inside to outside; both core layers have a gradient profile, with the distribution index α1 of the first core layer being 1.5 to 1.9, and the distribution index α2 of the second core layer being 1.4 to 1.9; the minimum relative refractive index difference △1 of the first core layer is 0.3% to 0.6%; the maximum relative refractive index difference of the first core layer and the second core layer are the same, denoted as △2, with △2 being 0.6% to 0.9%, and △2 > △1; the minimum relative refractive index difference △3 of the second core layer is -0.2% to -0.1%. The invention can achieve extremely low differential mode group delay.

Changfei Optical Fiber was established on May 31, 1988, and listed on the Shanghai Stock Exchange on July 20, 2018. The company’s registered and office addresses are both in Wuhan, Hubei Province. It is a leading global supplier of optical fiber preforms, fibers, and cables, with a complete industrial chain and advanced technology, highlighting its investment value.

Changfei Fiber’s industry classification under Shenwan is “Communication - Communication Equipment - Communication Cables and Supporting,” involving concepts such as optical fiber cables, CPO, and optical communication sectors. Its main business focuses on the communications industry, targeting telecom operators and data communication fields, creating an integrated industry chain of rods, fibers, and cables, along with diversified and international business models.

In 2025, Changfei Fiber’s revenue reached 14.25B yuan, ranking 1st/2nd in the industry, higher than the industry average and median of 7.57B yuan, with the second-ranked FujiDa at 880.14 million yuan. In its main business, optical transmission products accounted for 8.35B yuan, representing 58.56%. Net profit in the same period was 882 million yuan, ranking 1st/2nd in the industry, above the industry average and median of 485 million yuan, with FujiDa second at 88 million yuan.

Recent patent information for Changfei Fiber and Cable Co., Ltd.:

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