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Fiber Optics Flashcards

7 cards from real VDV practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. According to TIA-568 standards, what is the maximum channel insertion loss allowed for OM3 multimode fiber at 850 nm for a 100 m horizontal link?

    Answer: 2.4 dB

    TIA-568 specifies a maximum channel loss of 2.4 dB for a 100 m OM3 horizontal link at 850 nm, accounting for connectors, splices, and fiber attenuation.

  2. What is 'chromatic dispersion' in single-mode fiber?

    Answer: Pulse spreading caused by different wavelengths traveling at different speeds

    Chromatic dispersion occurs because different wavelengths of light have slightly different velocities in the fiber, causing pulse broadening that limits bandwidth over distance.

  3. Which fiber optic cable construction uses individual tight-buffered fibers surrounded by a single outer jacket?

    Answer: Tight-buffered breakout (distribution) cable

    Tight-buffered breakout cables house individually buffered 900 µm fibers under one jacket, making each fiber directly connectorizable without a fan-out kit.

  4. A technician notices the OTDR shows a 'gainer' (apparent increase in backscatter level) at a splice point. What does this indicate?

    Answer: The fiber after the splice has higher backscatter than the preceding fiber section

    A gainer occurs when the fiber after the splice has a higher backscatter coefficient, making the splice appear to gain power; bidirectional OTDR testing averages out this artifact.

  5. What does the term 'OM5' designate for multimode fiber?

    Answer: Wideband multimode fiber supporting short-wavelength division multiplexing (SWDM)

    OM5 (lime green jacket) is a wideband 50/125 µm multimode fiber optimized for SWDM transmission using wavelengths from 850 nm to 953 nm.

  6. In a fiber optic cable plant, what is the purpose of a 'splice closure' (or splice enclosure)?

    Answer: To protect and organize fiber splices in outdoor or underground environments

    Splice closures provide environmental protection (moisture, rodents, UV) and mechanical organization for fiber splices in aerial, underground, or direct-burial applications.

  7. When performing an end-to-end insertion loss test per TIA-568, which reference method is used to establish the baseline optical power measurement?

    Answer: Method A (one reference cord)

    TIA-568 Method A uses one reference cord to set the baseline, including the loss of one mated connector pair in the reference, and is the most common method for channel testing.