LiNbO3 (Lithium Niobate) on Glass Bonded Wafers is a composite substrate used in the fabrication of photonic devices such as modulators, filters, and multiplexers. The substrate consists of a thin layer of lithium niobate bonded to a glass substrate, which provides mechanical support and thermal stability to the thin film. The glass used in the bonding process is typically chosen for its low thermal expansion coefficient and high optical transparency. The resulting substrate has excellent optical quality and is well-suited for high-performance photonic devices.