RCDD Optical Fiber Systems and Testing

Question 1

What is the core/cladding diameter of standard single-mode optical fiber as defined by ITU-T G.652?

Accepted Answer

9/125 µm

Answer

50/125 µm

Answer

62.5/125 µm

Answer

10/125 µm

Question 2

Which multimode fiber type supports the highest bandwidth for short-reach data center applications and is recommended by ANSI/TIA-568 for new installations?

Accepted Answer

OM4 or OM5 (50/125 µm laser-optimized)

Answer

OM1 (62.5/125 µm)

Answer

OM3 (50/125 µm legacy)

Answer

OM2 (50/125 µm)

Question 3

What test equipment is used to measure optical fiber attenuation and locate faults or breaks in a fiber link?

Accepted Answer

Optical Time Domain Reflectometer (OTDR)

Answer

Optical Power Meter (OPM)

Answer

Optical Spectrum Analyzer (OSA)

Answer

Visual Fault Locator (VFL)

Question 4

What is the maximum attenuation allowed for a multimode OM3 fiber link connector per ANSI/TIA-568?

Accepted Answer

0.75 dB per mated connector pair

Answer

0.5 dB per mated connector pair

Answer

1.0 dB per mated connector pair

Answer

0.3 dB per mated connector pair

Question 5

What does 'chromatic dispersion' cause in single-mode optical fiber?

Accepted Answer

Different wavelengths of light travel at slightly different speeds, broadening the pulse

Answer

Light leaks out of the cladding at sharp bends

Answer

Optical power is partially reflected at connector interfaces

Answer

The fiber's core index of refraction varies with temperature

Question 6

A fusion splice in single-mode fiber typically achieves a loss of approximately:

Accepted Answer

0.02–0.1 dB

Answer

0.5–1.0 dB

Answer

0.3–0.5 dB

Answer

Less than 0.01 dB always