Glossary
| Term | Main definition |
|---|---|
| Demarcation point |
A point where the operational control or ownership
changes, such as the point of interconnection between
telephone company facilities and a user
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| Demodulate |
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| Demultiplex |
The process of separating channels that were previously
joined using a multiplexer.
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| Demultiplexer |
A device that separates signals of different wavelengths
for distribution to their proper receivers.
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| Dense wavelength division multiplexing (DWDM) |
A form of multiplexing that separates channels by transmitting
them on different wavelengths at intervals of
about 0.8nm (100GHz).
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| Detector |
(1) A device that detects the presence or absence of an
optical signal and produces a coordinating electrical
response signal. (2) An optoelectric transducer used in
fiber optics to convert optical power to electrical current.
In fiber optics, the detector is usually a photodiode.
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| Detector noise limited operations |
Occur when the detector is unable to make an intelligent
decision on the presence or absence of a pulse due to the
losses that render the amplitude of the pulse too small
to be detected or due to excessive noise caused by the
detector itself.
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| Diameter mismatch loss |
The loss of power that occurs when one fiber transmits to
another and the transmitting fiber has a diameter greater
than the receiving fiber. It can occur at any type of coupling
where the fiber/coupling sizes are mismatched:
fiber-to-fiber, fiber-to-device, fiber-to-detector, or sourceto-
fiber. Fiber-optic cables and connectors should closely
match the size of fiber required by the equipment.
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| Diamond Network / Programme | MBNL Network improvement / consolidation programme.
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| Dichroic filter |
Selectively transmits or reflects light according to
selected wavelengths. Also referred to as dichromatic
mirror.
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| Die Cast | (see Shielded hood)
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| Dielectric |
Material that does not conduct electricity, such as nonmetallic
materials that are used for cable insulation
and jackets. Optical fiber cables are made of dielectric
material.
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| Dielectric constant |
The property of a dielectric material that determines the
amount of electrostatic energy that can be stored by the
material when a given voltage is applied to it. The ratio
of the capacitance of a capacitor using the dielectric to
the capacitance of an identical capacitor using a vacuum
as a dielectric. Also called permittivity.
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| Dielectric loss |
The power dissipated in a dielectric material as the result
of the friction produced by molecular motion when an
alternating electric field is applied.
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| Dielectric nonmetallic |
Refers to materials used within a fiber-optic cable.
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