How high is the cross-sectional area of ​​the butterfly-shaped optical cable in mm

The exact height of butterfly-shaped optical cables varies by model and manufacturer, typically ranging from 2 mm to 5 mm for indoor FTTH types.Design OverviewButterfly-shaped optical cables feature a flat, wing-like cross-section with the optical fiber positioned at the center and two parallel strength members (usually FRP) on either side, giving the cable its distinctive butterfly profile . This design allows the cable to bend easily along its flat plane while resisting sharp kinks when bent edge-on, which protects the fiber core during installation . Outdoor variants may include a steel messenger wire for aerial support, slightly increasing the overall cross-section height .Typical DimensionsIndoor FTTH butterfly cables: Generally 2–3 mm in height and 4–5 mm in width, depending on fiber count (1–12 cores) and sheath type (LSZH), .Outdoor self-supporting butterfly cables: Height may increase to 4–5 mm due to the addition of steel wire and dual-layer PE/LSZH jackets .Fiber count impact: More fibers or additional protective layers slightly increase the height, but the flat profile is maintained for conduit compatibility .Practical ConsiderationsThe flat, low-profile design facilitates installation in conduits, risers, and wall channels.Bend-insensitive fibers (ITU-T G.657) are commonly used to allow tight-radius bends without signal loss .When planning conduit or duct space, consider both height and width, as the butterfly shape is directional and may require orientation for minimal stress on fibers . For precise height specifications, it is recommended to consult the manufacturer datasheet for the specific cable model, as values can vary depending on fiber count, sheath material, and whether the cable is indoor or outdoor .