A V Groove Lid is a precision-engineered auxiliary component designed to secure and protect optical fibers in V groove substrates, widely used in fiber optic packaging (e.g., fiber arrays, PLC splitters, or optical modules). Here’s a detailed technical introduction:
Core Definition & Purpose
It is a thin, rigid cover matched to V groove substrates (silica, ceramic, or glass) with pre-machined V-shaped grooves. Its primary functions are fixing optical fibers in the grooves to maintain precise alignment, preventing fiber displacement from vibration or external stress, and providing physical protection against dust, moisture, or mechanical damage.
Key Design & Materials
Material Selection: Common materials include silica glass, soda-lime glass, or engineering plastics (e.g., PPS, LCP). These materials offer high dimensional stability, low thermal expansion, and compatibility with substrate materials to avoid alignment drift.
Structural Features: The lid’s inner surface is often flat or micro-textured to fit tightly with the substrate. It may include positioning notches or adhesive channels for easy assembly and secure bonding (via epoxy resin or laser welding).
Dimensional Precision: Thickness ranges from 0.1mm to 1mm, with micron-level flatness (≤±5μm) to ensure uniform pressure on fibers without damaging the fiber cladding.
Critical Performance Traits
Alignment Retention: Maintains fiber core spacing accuracy (e.g., 127μm or 250μm pitch) with deviation <±1μm, preserving low insertion loss in optical connections.
Mechanical Stability: Resists impact, bending, and temperature fluctuations (-40℃ to +85℃) without deformation, ensuring long-term reliability in harsh environments.
Bonding Compatibility: Works with standard optical adhesives, forming a hermetic or semi-hermetic seal to isolate fibers from environmental contaminants.
Low Optical Interference: Non-porous and optically inert materials prevent light scattering or absorption, avoiding signal degradation.
