Optical Fiber Preform (Silica Glass Rod)

U.S. specialty glass maker (NYSE: GLW); supplier of EXTREME ULE (Ultra-Low Expansion) glass substrates to Hoya and AGC for use as the raw base material of EUV photomask blanks. Received $32M CHIPS Act funding to expand Canton, NY plant for EUV substrate production (2025-2026 timeline). Corning supplies substrates only — not finished blanks (Mo/Si coating performed in-house by Hoya/AGC). Also makes optical fiber, Gorilla Glass for mobile devices, pharmaceutical packaging glass, and display glass.

World's largest fiber optic manufacturer by volume; holds ~15% of global preform capacity. The only company globally to commercially master all three mainstream preform technologies (OVD, VAD, PCVD).

Shin-Etsu Chemical Co., Ltd. (Tokyo; TSE: 4063; ~¥2.3 trillion revenue) is Japan's second-largest EUV photoresist supplier, holding approximately 20-25% of the EUV photoresist market through its SEPR (Shin-Etsu Polymer Resist) product line. Primary EUV resist production at Niigata and Gunma facilities in Japan. The same parent company is the world's largest polyvinyl chloride (PVC) producer, the world's largest silicon wafer producer (through Shin-Etsu Silicones/SEH), and a major hydroxypropyl methylcellulose (HPMC) pharmaceutical excipient manufacturer. Shin-Etsu's photoresist was among the materials covered by Japan's July 2019 export controls targeting South Korea, as fluorinated polyimide — a resist ancillary material — was one of the three restricted chemicals.

Japanese electrical/fiber optic conglomerate (TSE: 5803), founded 1885, headquartered in Tokyo. One of the top-5 global optical fiber preform and fiber producers via VAD process; co-invented VAD (Vapor Axial Deposition) in 1977 with NTT and Furukawa. Primary preform facility: Sakura Works (Sakura City, Chiba Prefecture). In March 2026, announced investment of up to ¥300 billion ($1.9B) to triple production capacity at each manufacturing site in Japan and the US. Signed Japan-US Framework Agreement with US Department of Commerce (October 28, 2025) designating Fujikura as a strategic AI infrastructure fiber supplier. Sold out of fiber through 2026 on AI data center demand surge. Also produces electronic wiring harnesses, power cables, and fusion splicers.

Prysmian Group (BIT: PRY, HQ Milan; ~€16B revenue) is the world's largest cable and wire systems manufacturer (cables for energy transmission, telecoms, building wiring, industrial applications). Prysmian does not produce its own copper rod at scale; it acquires rod as the primary input for its cable manufacturing operations across Europe, the Americas, and Asia. Post-merger with General Cable (2018, ~$3B), Prysmian operates 106 facilities in 50+ countries. As the world's largest cable maker, Prysmian's copper rod purchasing volume makes it one of the largest single buyers of copper rod globally — its sourcing decisions significantly influence rod pricing and availability in European and North American markets.

Japanese electronics and materials conglomerate (TSE: 5802 / 6502 parent). Co-invented VAD process in 1977 alongside Furukawa and NTT. Consistently top-5 global preform producer; particularly strong in high-performance preforms for submarine cable applications. Primary preform facilities at Yokohama Works (Kanagawa Prefecture, mass production since 1994) and Kiyohara plant (Tochigi Prefecture, since 1999). Achieved world record ultra-low-loss single-mode fiber (0.1397 dB/km, presented OFC 2024); launched world's first mass-produced ultra-low-loss multi-core fiber (September 2023). Also produces copper wire, power cables, automotive parts, and infotainment systems.

Japanese electrical conglomerate (TSE: 5802), co-inventor of VAD (Vapor Axial Deposition) preform process in 1977 with NTT and Fujikura. Primary optical fiber preform and drawing facility at Mie Works (Kameyama City, Mie Prefecture), which received IEEE Milestone recognition and switched to 100% renewable energy (announced October 2023). Launched the world's highest-fiber-count cable (13,824-fiber) from Mie Works No. 2 plant (February 2026). US operations via OFS Fitel (Norcross/Carrollton/Avon GA) — OFS and Hengtong formed a JV (Jiangsu OFS Hengtong Optical Technology, Suzhou, est. 2010) to produce VAD preforms in China. Furukawa is one of the world's most vertically integrated optical fiber companies: preform → fiber → cable → connectivity.

Suzhou-based Chinese optical fiber and cable conglomerate (SSE: 600487). China's largest optical fiber and cable manufacturer by some measures; ~15% international market share. Produces preforms via VAD technology (acquired through OFS/Hengtong JV, est. 2010) and its own wholly-owned preform plant (Hengtong Photoconductive New Materials, est. 2016, planned 1,500 t/yr capacity). Won 15.48% share (15.3M fiber-km) of 2025/2026 China Mobile cable tender. Also produces submarine cables, energy cables, and satellite communication systems. Claims preform self-sufficiency since ~2017.

Wuhan-based Chinese state-owned fiber optic and telecom equipment company (SZ: 000498), subsidiary of Datang Telecom Group. Produces >40M km of optical fiber annually at Wuhan and Shenzhen factories; automated drawing at 18 m/s (250,000 core-km/month). Won 11.61% share (11.5M fiber-km) of 2025/2026 China Mobile cable tender. G.657.A2 data center fiber sales up 3x in 2025/2026. Also a major telecom equipment and network solution vendor. State-owned; develops domestic preform capability as part of China's strategic fiber independence policy.

Nantong-based Chinese cable conglomerate (SH: 600522); 2024 revenue surpassed $14 billion USD. Controls full value chain from raw materials to preform to fiber to cable to installation. Optical fiber subsidiary ZTT Fiber Optic Co. Ltd. holds annual preform capacity of 200 t G.652 + 10 t G.657A2. Won largest share (19.36%; 19.1M fiber-km) of 2025/2026 China Mobile cable tender. Also produces submarine cables and offshore wind energy cables; growing rapidly in global markets. Among top Chinese fiber makers by volume.

Pune-headquartered Indian optical fiber and network solutions company (NSE: STRTECH), part of Vedanta Group. India's leading fiber maker; exports to 100+ countries. Flagship preform plant: "Gaurav" campus at Aurangabad (Waluj + Shendra MIDC), Maharashtra — self-described as the world's largest greenfield semiconductor-grade preform plant; the only STL location manufacturing glass preforms. Total group capacity 50M+ fiber-km/year across India, Italy (acquired Metallurgica Brescia), Brazil, and US. In 2024, signed green hydrogen supply agreement with Hygenco for the Aurangabad preform plant. Divested non-core services businesses 2023-2024 to refocus on optical fiber.

German specialty materials subsidiary of Heraeus Group (Hanau, Germany). Produces specialty and telecom optical fiber preforms at Hanau via its proprietary RIC® (Rod-in-Cylinder collapse) process alongside PCVD, VAD, OVD, and MCVD capabilities. RIC® flagship: 230mm OD × 3m preform yielding >7,000 km of single-mode fiber — one of the world's largest preform formats. Also makes Fluosil® specialty fused silica preforms for UV-IR, medical lasers, industrial and scientific applications. Historically supplied fused silica tubes to Bell Labs (1973 MCVD invention). Smaller volume than the fiber majors (<1% global market share in telecom preforms); positioned as specialty/custom and technology leader rather than commodity producer. Also sells cladding deposition as a service.