OSP Jargon Flashcards
True/False
Optical fibers can transmit either voice, data or video and either analog or digital signals.
ANSWER: True
Virtually any communications signals at any speed can be transmitted over fiber.
True/False
Singlemode fiber has a smaller core than multimode fiber.
ANSWER: True
Singlemode fiber has a core size of 8-9 microns compared to 50-62.5 microns of GI multimode, 240 micron PCS/HCS or 1000 micron POF.
In an optical fiber, the light is transmitted through the \_\_\_\_\_\_\_\_\_\_. A. Core B. Cladding C. Buffer D. Jacket
ANSWER: A. Core
The core of the fiber transmits the optical signals, the cladding traps the fiber in the core and the buffer and jacket protect the fiber.
The diameter of an optical fiber is traditionally measured in \_\_\_\_\_\_\_\_\_\_. A. Meters B. Millimeters C. Microns (micrometers) D. Nanometers
ANSWER: C. Microns (micrometers)
Most glass fibers are 125 microns outside diameter. A micron, one-millionth of a meter, is the conventional term used for measuring fiber geometry.
Rays of light transmitted in multimode fiber are called \_\_\_\_\_\_\_\_\_\_. A. Reflections B. Refractions C. Waves D. Modes
ANSWER: D. Modes
The rays are called modes from the technical term for a electromagnetic field pattern.
Loss of a fiber or any fiber in a cable is measured in __________.
A. dB
B. dBm
C. milliwatts
ANSWER: A. dB
dB is a relative power on a log scale, used for measuring loss. dBm refers to power in milliwatts.
10 dB corresponds to a factor of \_\_\_\_\_\_\_\_\_\_ in power. A. 2 B. 10 C. 20 D. 100
ANSWER: B. 10
10 dB means a factor of 10. 20 dB is a factor of 100, 3 dB is a factor of 2.
A fiber stripper removes the __________ of the fiber.
A. Core
B. Cladding
C. Buffer coating
ANSWER: C. Buffer coating
When terminating or splicing fiber, it is necessary to remove the plastic buffer coating from the glass fiber.
The \_\_\_\_\_\_\_\_\_\_ protects the fiber from harm. A. Primary buffer coating B. Aramid fiber strength members C. Jacket D. All of the above
ANSWER: D. All of the above
All the components of the cable, the jacket and strength members - in addition to the primary buffer coating on the glass fiber - are designed to protect the fiber during installation and from the environment it will be installed in.
Which fiber optic test instrument uses backscattered light for measurements? A. OLTS B. OTDR C. VFL D. Tracer
ANSWER: B. OTDR
Rather than make a direct measurement of loss, the OTDR uses backscattered light from the fiber to indirectly measure loss of the fiber and any other events (connectors, splcies or bends).
The wavelength of light used for most fiber optic systems is in the __________ region and __________ to the human eye.
A. ultraviolet, invisible
B. solar, visible
C. infrared, invisible
ANSWER: C. infrared, invisible
Since fiber has lower loss in the infrared, longer (infrared) wavelengths are used for most fiber optic communications systems. This light is invisible to the human eye.
