CFOT Fiber Optic Cleaning and Inspection 2

Question 1

How many inspection zones are defined for single-mode connector end-faces per IEC 61300-3-35?

Accepted Answer

4

Answer

IEC 61300-3-35 defines four concentric zones (A, B, C, D) from the core outward to the contact area of the connector end-face.

Question 2

What purity level of isopropyl alcohol (IPA) is recommended for cleaning fiber optic connectors?

Accepted Answer

99%

Answer

99% pure IPA minimizes water residue that could contaminate the end-face or cause spotting after the solvent evaporates.

Question 3

Which cleaning tool is designed specifically to clean the ferrule end-face of a connector installed inside an adapter?

Accepted Answer

Stick cleaner (push-to-clean device)

Answer

Stick cleaners are inserted into adapters to contact and clean the ferrule end-face without removing the connector from the bulkhead.

Question 4

What contaminant transferred by direct hand contact with fiber end-faces is particularly problematic because it leaves a persistent film?

Accepted Answer

Skin oils

Answer

Skin oils form a thin, persistent film that bonds strongly to the glass surface and significantly increases insertion loss if not properly cleaned.

Question 5

Per IEC 61300-3-35, what is the allowable number of scratches in Zone A (core region) for a single-mode PC connector to pass inspection?

Accepted Answer

No scratches are allowed in Zone A

Answer

Zone A of a single-mode PC connector must be completely free of scratches to meet IEC 61300-3-35 pass criteria because any scratch directly blocks the light path.

CFOT - Certified Fiber Optic Technician Practice Test

CFOT - Certified Fiber Optic Technician Practice Test

CFOT Fiber Optic Cleaning and Inspection 2