Glossary

The amount of light transmitted from a fiber represented as a curve over a range of launch angles. See also acceptance angle.

An optical device to insert or withdraw a signal from a fiber from between two ends. Many couplers require connectors on either end, and for many applications they must be APC (angled physical contact) connectors. The most popular access coupler is made by the fused biconic taper process, wherein two fibers are heated to the softening point and stretched so that the mode fields are brought into intimate contact, thus allowing a controlled portion of light to move from one core to the other.

Rules by which a network peripheral accesses the network medium to transmit data on the network. All network technologies use some type of access method;common approaches include Carrier Sense Multiple Access/Collision Detection (CSMA/CD), token passing, and demand priority.

A message confirming that a data packet was received.

Converts an optical input into two or more optical outputs without gain or regeneration.

A device similar to a repeater that includes a receiver and one or more transmitters. The idea is to regenerate the input signal and then send them on. These are used in optical fiber networks.

Lasers are defined by their medium; laser mediums such as gas, (CO2, helium, neon) crystal (ruby) semiconductors, and liquids are used. Almost all lasers create coherent light on the basis of a medium being activated electronically. The stimulation can be electronic or even more vigorous, such as exciting molecular transitions from higher to lower energy states, which results in the emissions of coherent light.

In Token Ring networks, the active monitor is a designated machine and procedure that prevents data frames from roaming the ring unchecked. If a Token Ring frame passes the active monitor too many times, it is removed from the ring. The active monitor also ensures that a token is always circulating the ring.

A process performed with an alignment device, using the light in the core of one fiber to measure the transmittance to the other. Ensures optimal alignment before splicing is completed. The active splicing device allows fusion splicing to perform much better with respect to insertion losses when compared to most connectors and splicing methods. A splicing technician skilled at the use of an active splicing device can reliably splice with an upper limit of 0.03dB of loss.

Antenna Control Unit

An RF network that exists only for the duration of the communication. Ad hoc networks are continually set up and torn down as needed.

With respect to optical fiber, a passive device used to join two connectors and fiber cores together. The adapter is defined by connector type, such as SC, FC, ST, LC, MT-RJ, and FDDI. Hybrid adapters can be used to join dissimilar connectors together, such as SC to FC. The adapter

A device used to change one connector type to another (RJ45 to D Type) or one gender to another (BNC Male to BNC Female).

Acquisition Design and Construction contractor. Contract company with overall responsibility for the delivery of a project.

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