Simple type of semiconductor laser that makes use
of the Fabry-Perot resonator effect. Has a relatively
large spectral full width at half maximum (a few nm).

Space defined on two sides by flat, parallel mirrors.
A flat wave injected perpendicularly to the mirror
faces travels back and forth multiple times between
the mirrors. A standing wave of high intensity forms
in the resonator (resonance) if twice the distance
between the mirrors is equal to a multiple of the light’s
wavelength.

The plane of oscillation of linearly polarised light
is twisted if a magnetic field is applied in the direction
of the light. The proportionality constant
between the magnetic field and the angle of rotation
per light path travelled in the field is the Verdet
constant. The Faraday effect is used in the design
of a Faraday rotator.

Guide pin for fiber connectors in which the fiber
is secured.

Term for a round optical waveguide.

Uses a laser-like amplification effect in a fiber, whose
core is highly doped with erbium, for example,
and is stimulated with an optical pump power of
a specific wavelength.

The frequency at which the value of the transfer
function (based on the optical power) of a fiber
decreases to half its value.

A spectral filter that is based on the change in refractive
index in the fiber core. A key element of components
such as optical multiplexers/demultiplexers,
dispersion compensators or EDFAs with a flattened
amplifier curve.

Consists of one or more materials that are used for protecting
the individual fibers from damage and provide
mechanical isolation and/or mechanical protection.

Inherent curvature of a fiber

Mode field diameter

Formation of combination frequencies (totals, differences)
of optical signals through nonlinear optical
effects. Occurs as interference in a fiber (consequence:
nonlinear crosstalk in DWDM systems) and is used
for shifting the frequency of optical signals.

Attenuation as the result of Fresnel reflection

Reflection as the result of a change in the refractive
index

Width of a distribution curve (time, wavelength)
at which the power drops to half its maximum value.

A synthetically produced glass with a silicon dioxide
content >99 %, base material for glass fibers.