CFOT Fiber Optic Cleaning and Inspection

Question 1

What is the primary reason for cleaning and inspecting fiber optic connectors before mating?

Accepted Answer

To prevent signal loss and end-face damage caused by contamination

Answer

To verify the connector type is correct for the application

Answer

To measure the connector's return loss value

Answer

To ensure the fiber is properly cleaved at the ferrule

Question 2

Which IEC standard defines pass/fail criteria for fiber optic connector end-face inspection?

Accepted Answer

IEC 61300-3-35

Answer

IEC 61754-4

Answer

IEC 60793-1-40

Answer

IEC 61300-2-2

Question 3

What magnification is typically recommended when inspecting single-mode fiber optic connector end-faces?

Accepted Answer

400x

Answer

100x

Answer

200x

Answer

800x

Question 4

What is the correct sequence when using the wet-dry cleaning method for fiber optic connectors?

Accepted Answer

Wet wipe first, then dry wipe

Answer

Dry wipe first, then wet wipe

Answer

Two wet wipes followed by one dry wipe

Answer

Wet wipe only with no dry step needed

Question 5

Per IEC 61300-3-35, which inspection zone on a connector end-face is most critical for optical signal quality?

Accepted Answer

Zone A (core region)

Answer

Zone B (cladding region)

Answer

Zone C (adhesive region)

Answer

Zone D (contact region)

Question 6

What type of inspection tool is best suited for examining connectors already installed inside adapters or bulkheads?

Accepted Answer

Video inspection probe

Answer

Benchtop microscope

Answer

Interferometer

Answer

Optical time-domain reflectometer (OTDR)

Question 7

What is the purpose of performing a dry wipe as the FIRST step before applying solvent to a fiber end-face?

Accepted Answer

To remove loose particulates before solvent can spread them across the surface

Answer

To pre-heat the end-face for better solvent adhesion

Answer

To abrade away surface oxide layers

Answer

To establish a baseline cleanliness measurement