GRANOPT to Cut Faraday Rotator Production Due to Rare Earth Supply Delays from China

Published: Mar 24, 2026 16:10

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Faraday rotator supplier GRANGPT issued a statement on production cuts. The core upstream raw material for Faraday rotators is SGGG (Substituted Gadolinium Gallium Garnet), which is made from bismuth-substituted rare-earth garnet using the liquid phase epitaxy (LPE) method. Nearly all of the rare earths used by GRANOPT’s substrate supplier, SMM Precision, relied on supply from China, and the time consumed in the current acceptance process by China’s Ministry of Commerce has far exceeded expectations, so the company will gradually reduce Faraday rotator production starting in January 2026.

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