From Optical Networking Best Practices Handbook

Absorption: The portion of optical attenuation in an optical fiber resulting from the conversion of optical power to heat; caused by impurities such as hydroxyl ions in the fiber.

A/B Switch: A device that accepts inputs (optical or electrical) from a primary path and a secondary path to provide automatic or manual switching in the event that the primary path signal is broken or otherwise disrupted. In optical A/B switches, optical signal power thresholds dictate whether the primary path is functioning and signals a switch to the secondary path until optical power is restored to the primary path.

AC: Alternating current. An electric current that reverses its direction at regularly recurring intervals.

Acceptance Angle: The half-angle of the cone within which incident light is totally internally reflected by the fiber core. It is equal to sin–1(NA), where NA is the numerical aperture.

Active Device: A device that requires a source of energy for its operation and has an output that is a function of present and past input signals. Examples include controlled power supplies, transistors, LEDs, amplifiers, and transmitters.

A/D or ADC: Analog-to-digital converter. A device used to convert analog signals to digital signals.

Add/Drop Multiplexing: A multiplexing...

More >> Show More...

Products & Services
Fiber Optic Cables
Fiber optic cables are composed of one or more transparent optical fibers enclosed in protective coverings and strength members. Fiber optic cables are used to transmit "light" data.
Wavelength Division Multiplexers (WDM)
Wavelength division multiplexers (WDM) are devices that combine light signals with different wavelengths, coming from different fibers, onto a single fiber. They include dense wavelength division multiplexers (DWDM), devices that use optical (analog) multiplexing techniques to increase the carrying capacity of fiber networks beyond levels that can be accomplished via time division multiplexing (TDM).
Specialty Optical Fiber
Specialty optical fiber is modified, usually by doping, for a specialized function. It consists of one or more transparent fibers enclosed in a protective covering.
Fiber Optic Transceivers
Fiber optic transceivers include both a transmitter and a receiver in the same component.
Fiber Optic Couplers
Fiber optic couplers are optical devices that connect three or more fiber ends, dividing one input between two or more outputs, or combining two or more inputs into one output.

Topics of Interest

Today, many large enterprises find themselves attempting to meet what appear to be two diametrically opposed objectives. On the one hand, these enterprises are looking for ways to utilize IT as a...

4.11 ENGINEERING DWDM SYSTEMS Engineering a DWDM system begins with a market investigation to understand the business opportunities and how the "to be built" system fits the communications...

There are many types of optical fibers, and we will consider a few of them here.   4.3.1 Fiber Optics Glass Glass fiber optics is a type of fiber-optic strand (discussed earlier) that has a...

5.1   INTRODUCTION Loss or attenuation and pulse dispersion represent the two characteristics of an optical fiber most important in determining the information-carrying capacity of a fiber optic...

11.1 Introduction Although coaxial cable distribution systems are used for the last mile delivery of broadband services to subscribers, other technologies are frequently used to cover most of the...

Product Announcements
Electro Standards Laboratories