If a fiber optic cable is bent, gently reroute it to maintain the minimum bend radius and replace any damaged patch cords; serious repairs require a professional technician.

Immediate Steps

1. Inspect the Cable: Look for visible kinks, sharp bends, or cracks in the cable jacket. Avoid pressing on any damaged areas, as the glass core is extremely fragile and can break easily (Engineer Fix) .
2. Reroute the Cable: Ensure the cable follows a smooth path without tight loops. Fiber optic cables should not be bent tighter than ten times the cable diameter, roughly the circumference of a standard coffee mug for indoor drop cables, to prevent light loss (macrobending) .
3. Secure the Cable: Use cable clips or gentle tape to hold the cable along walls or baseboards, avoiding direct pressure on any damaged spots .

Testing and Replacement

• Check Connectivity: Observe the router's indicator lights. A “Loss of Signal” (LOS) LED or intermittent connectivity may indicate the bend has caused signal degradation (HOLIGHT) .
• Replace Patch Cords: If the bend affects a short, pre-terminated patch cord (jumper cable with SC or LC connectors), it can be safely replaced at home with a matching connector type and polish .

Professional Repair

• Internal Fiber Damage: If the bend has caused a microbend or macrobend in the core, or if the main line is affected, repair requires fusion splicing or mechanical splicing, which must be performed by a trained technician using specialized equipment (FS.com) .
• OTDR Testing: Professionals use an Optical Time-Domain Reflectometer (OTDR) to locate internal faults and ensure low-loss connections after repair .

Preventive Measures

• Follow Bend Radius Guidelines: Always maintain the recommended bend radius during installation and routing.
• Use Protective Cables: In high-risk areas, consider armored or industrial-grade fiber cables to reduce accidental bending or damage .
• Regular Inspection: Periodically check cables for kinks, loose connectors, or environmental stress to prevent long-term signal loss . By carefully rerouting bent cables, replacing damaged patch cords, and involving professionals for serious internal damage, you can restore and maintain stable fiber optic connectivity.