Connectors and Terminations Flashcards

A technician is experiencing high insertion loss after terminating a fiber optic cable with an epoxy/polish connector. Microscopic inspection reveals a fractured fiber end-face. Which of the following is the most likely cause of this issue?

Answer: Improper cleaving of the fiber before polishing.

A proper cleave creates a clean, flat fiber end-face perpendicular to the fiber axis. A poor cleave can result in a jagged or angled end, which is highly susceptible to fracturing during the polishing process, leading to significant insertion loss and reflectance.

Which component of a fiber optic connector is primarily responsible for aligning the fiber core with another fiber?

Answer: The ferrule

The ferrule is a precision-engineered ceramic, metal, or plastic component that holds the fiber in place and centers it within the connector. Its precise inner diameter and concentricity are critical for aligning the cores of two fibers to minimize insertion loss.

During a field installation, a technician needs to terminate a single-mode fiber quickly. Which termination method eliminates the need for field polishing and adhesives?

Answer: Pre-polished/splice connectors (SOC)

Pre-polished/splice connectors (also known as Splice-On Connectors or SOCs) contain a factory-polished fiber stub. The field fiber is cleaved and then joined to this stub using a mechanical or fusion splice inside the connector body, eliminating the need for adhesives and hand polishing in the field.

What is the primary advantage of using a heat-cured epoxy for terminating fiber optic connectors in a factory setting?

Answer: Highest reliability and lowest loss due to a strong fiber-to-ferrule bond.

Heat-cured epoxies create a very strong and stable bond between the fiber and the ferrule. This bond minimizes fiber movement due to temperature changes, resulting in connectors with consistently low insertion loss and high reliability, making it the preferred method for factory-produced patch cords and pigtails.

A technician notices a significant amount of signal loss (attenuation) only when a patch cord is bent at a sharp angle. This type of loss is known as:

Answer: Macrobending loss

Macrobending loss occurs when the fiber is bent around a radius that is too tight, causing light to leak out of the core, resulting in signal loss. This is a common issue during installation if cables are not routed with a proper bend radius.

Which of the following connector polish types offers the lowest back reflection and is typically identified by a green connector body or boot?

Answer: APC (Angled Physical Contact)

APC connectors feature a fiber end-face that is polished at an 8-degree angle. This angle causes reflected light to bounce out of the fiber core instead of traveling back to the source, resulting in the lowest back reflection (highest return loss). They are commonly identified by their green color.