Grinding Process of Fiber Array Board

Fiber array boards undergo precise grinding and polishing to achieve sub-micron flatness and accurate fiber alignment for optimal optical performance.Overview of Fiber Array GrindingThe grinding process in fiber array board fabrication is a critical step to ensure flatness, fiber height uniformity, and end-face angle precision. After the optical fibers are placed in V-grooves and bonded with adhesive, the surface must be ground and polished to meet stringent optical tolerances, typically flatness < 200 nm, fiber height < 200 nm, and end-face angle within 0.3–0.5° .Key Steps in the Grinding ProcessSubstrate Preparation: The fiber array substrate, often made of glass types like JGS2, BF33, or BK7, is pasted and secured in the grinding machine tray, ensuring proper alignment and vacuum stability .Slotting and Chamfering: V-grooves are cut using 60° or 90° V-shaped tools, and chamfering is applied to reduce edge damage. Roughness is controlled using 600-mesh, 800-mesh, or 1,000-mesh cutters depending on the required precision .Fiber Placement and Assembly: Stripped optical fibers are inserted into the V-grooves, and a cover plate is applied. Adhesives are distributed to fix and protect the fibers, ensuring mechanical stability during grinding .End-Face Grinding: The exposed fiber ends are ground to achieve the required flatness and angle. High-precision grinding machines and fixtures are used to maintain ultra-accurate fiber core positions, minimizing insertion loss and ensuring high optical return loss .Polishing: After grinding, polishing further refines the surface to remove micro-scratches and achieve optical-grade smoothness. This step is essential for reducing signal loss in optical applications.Equipment and PrecisionHigh-precision grinding machines are essential for fiber array boards. These machines allow accurate control of core pitch, fiber height, and end-face angle, which is critical for multi-channel optical modules, planar waveguides, and arrayed waveguide gratings . Automation and advanced fixtures help maintain consistency across multiple channels, especially when the number of fibers increases and pitch accuracy becomes more challenging.ApplicationsProperly ground fiber array boards are used in planar optical waveguides, arrayed waveguide gratings, active/passive fiber devices, and multi-channel optical modules. The precision achieved during grinding directly impacts optical coupling efficiency, signal integrity, and device reliability . In summary, the grinding of fiber array boards is a highly controlled process involving substrate preparation, V-groove slotting, fiber assembly, end-face grinding, and polishing. Advanced machinery ensures sub-micron flatness, precise fiber alignment, and optimal optical performance, making it a cornerstone of fiber array fabrication.