Fiber Optic Installation Flashcards

A fusion splice typically achieves what maximum average insertion loss?

Answer: 0.1 dB

A well-executed fusion splice typically achieves 0.1 dB or less of insertion loss, far lower than mechanical splices.

What is the purpose of optical fiber gel or index-matching gel in a mechanical splice?

Answer: To fill the air gap and reduce Fresnel reflection loss

Index-matching gel has a refractive index close to glass, filling any gap between fiber ends to reduce Fresnel reflection and insertion loss.

Which standard defines the insertion loss and return loss specifications for fiber optic connectors used in telecommunications?

Answer: TIA-568-C.3

TIA-568-C.3 (now part of TIA-568.3-D) specifies optical fiber cabling components including connector insertion loss and return loss limits.

What is the primary difference between OM3 and OM4 multimode fiber?

Answer: OM4 has higher bandwidth (EMB) supporting longer 10G/40G/100G distances

OM4 has a higher effective modal bandwidth (EMB) than OM3, extending 10G Ethernet to 550 m and 100G to 150 m versus OM3's shorter distances.

When measuring fiber optic link loss with an optical loss test set (OLTS), what does a bidirectional test reveal that a single-direction test does not?

Answer: Asymmetrical loss from connectors or splices

Bidirectional testing averages out directional loss differences at connectors, revealing asymmetrical problems that a one-way measurement would hide.

What does 'macrobending loss' in fiber optics refer to?

Answer: Signal loss from large bends exceeding the minimum bend radius

Macrobending loss occurs when fiber is bent beyond its minimum bend radius, causing light to radiate out of the core.

Which fiber optic cable construction type uses individual 250 µm coated fibers laid in a gel-filled tube?

Answer: Loose-tube cable

Loose-tube cables house individual 250 µm fibers in a gel-filled buffer tube, providing protection against moisture and temperature variation.