How to test a whole reel of optical cable

Testing an optical cable reel involves verifying its length, attenuation, and integrity using tools like OTDRs, optical fault locators, and power meters before installation.

Step 1: Visual and Physical Inspection

Before any measurements, inspect the reel for physical damage, cracks, or irregularities along the cable. Check the manufacturer's specifications and ensure the cable type, length, and quantity match the delivery documents. Confirm that the cable has not been exposed to excessive bending or crushing during transport .

Step 2: Prepare Testing Equipment

You will need:

• Optical Time-Domain Reflectometer (OTDR) for detecting faults, breaks, and measuring attenuation.
• Optical Loss Test Set (OLTS) or power meter with light source for measuring total loss.
• Visual Fault Locator (VFL) for identifying breaks or tight bends.
• Optional: fiber pigtails and temporary splices for connecting bare fibers . Ensure all instruments are calibrated and that you have clean connectors and proper adapters.

Step 3: Length Verification

Connect the OTDR or optical fault locator to a fiber at the free end of the reel. Measure the distance to the end of the fiber. The measured length should closely match the cable length specified on the reel. A shorter reading may indicate a break or a shorter-than-advertised cable .

Step 4: Attenuation and Loss Testing

• Use an OTDR to measure backscatter and identify any high-loss points, bends, or micro-cracks along the fiber.
• Alternatively, use a light source and power meter to measure the optical power at the far end. Compare it to the expected loss for the cable type and length. For multimode fibers, consider using a mode conditioner to ensure accurate measurements .

Step 5: Fault Detection

• Use a Visual Fault Locator (VFL) to visually detect breaks, cracks, or tight bends along the fiber.
• If a fault is detected, mark the location using the OTDR trace or VFL observation for potential replacement or repair .

Step 6: Repeat for Multiple Fibers

If the cable contains multiple fibers, repeat the tests for several fibers to ensure uniform quality across the reel. This helps detect any isolated defects that may not appear in a single fiber test .

Step 7: Documentation

Record all measurements, including length, attenuation, and any detected faults, in a test report. This documentation is essential for warranty claims and quality assurance before installation . By following these steps, you can ensure that the optical cable reel is free from defects, meets specifications, and is ready for deployment, reducing the risk of network issues after installation.