Tools, Equipment, and Safety Practices in OFC Work
Tools, equipment and safety practices in OFC work are tested through tool-selection, cleaning, laser-safety and glass-shard scenarios.
Core rules
- Basic kit: fibre stripper, precision cleaver, fusion splicer, splice sleeves, heat oven, OTDR, optical power meter, stable light source, VFL (650 nm), connector inspection scope, one-click cleaner, lint-free wipes and 99% IPA.
- Clean before every mating: inspect the endface at 200×/400×; a single dust particle causes back-reflection and loss. Use dry cleaning first; IPA only with a lint-free wipe and allow to dry.
- Laser safety: 1310/1550 nm is invisible and can damage the retina. Never look into a fibre, connector or bulkhead; use a power meter to confirm dark fibre. Work to IEC 60825 class limits and local SOP.
- Glass safety: cleaved fibre shards are sharp and can enter skin. Use a black mat, tweezers, tape and a sharps container; no eating or drinking at the bench; goggles for overhead work.
- Electrical and chemical safety: isolate powered equipment, use RCD-protected supply, ventilate solvent use, and follow the safety data sheet.
Worked example
A 1550 nm source launches −3.0 dBm. The power meter, set to 1550 nm and zeroed as reference, reads −21.5 dBm at the far end. Loss = −3.0 − (−21.5) = 18.5 dB. If the fibre is 50 km, average loss = 18.5/50 = 0.37 dB/km, which is plausible for 1550 nm with splices and connectors.
Traps
- Using the wrong wavelength setting: a 1310 nm calibration used at 1550 nm gives a false reading.
- Measuring absolute power without a reference and calling it loss.
- Looking into a live fibre just to check - a common distractor.
- Cleaning a connector with a dry tissue that leaves lint.