Fiber Optic Glossary : T

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  • T Carrier
    A system transmitting signals at one of the standard levels in the North American digital hierarchy.
  • T Coupler
    A passive optical coupler having three ports (three fibers).
  • Tachyons
    Tachyons are hypothetical particles, traveling with velocities above the vacuum velocity of light. Formally, such particles would appear to be...
  • Talkset Fiber Optic
    A communication device that allows conversation over unused fibers.
  • Tap
    To draw energy from a circuit.
  • Tap Loss
    In a fiber optic coupler, the ratio of power at the tap port to the power at the input...
  • Tap Port
    In a coupler in which the splitting ratio between output pods is not equal, the output port containing the lesser...
  • Taper
    A section of optical fiber or a micro-component that has a continuously changing outer dimension, along its length, from one...
  • Tapered Fiber
    An optical fiber in which the cross section, i.e., cross-sectional diameter or area, varies, i.e., increases or decreases, monotonically with...
  • TAXI
    Transparent synchronous transmitter-receiver interface.
  • TCP IP
    A protocol specification that conforms to the latest DOD ARPANET standard. The TCP/IP protocol module corresponds to layers three and four...
  • TDDM
    An abbreviation for time division demultiplexing.
  • TDM
    An abbreviation for time division multiplexing.
  • TEC
    Abbreviation for thermoelectric cooler. A device used to dissipate heat in electronic assemblies.
  • Tee Coupler
    A three-port optical coupler.
  • Telecom Fibers
    Telecom fibers are optical fibers which are used in optical fiber communications.
  • Telecommunications Management Network
    A network that interfaces with a telecommunications network at several points in order to receive information from, and to control...
  • TEM00
    A Gaussian-curve mode.
  • TEM01
    Divided into two equal beams for special applications.
  • Temporal Walk Off
    Loss of temporal overlap of pulses caused by group velocity mismatch.
  • Tensile Strength
    The strength of an optical fiber when placed in tension. Usually given in units of kilo-pounds per square inch...
  • Tensile test
    Pull test – a controlled pull test on the contact crimp joint to determine its mechanical strength.
  • Terminating
    Terminating a fiber is accomplished through preparing the fiber for connection to another fiber or device such as a connector....
  • Termination
    Termination of fiber optics is the process of cutting and adding a connector at the end of the fiber, making...
  • Termination and Splicing
    Termination and splicing equipment for fiber optics include tools or kits for cutting, finishing, positioning, aligning and joining fiber optic...
  • Termini
    More than 1 terminus. See Terminus[].
  • Terminus
    A device used to terminate, position, and hold an optical fiber within a connector.
  • Test Cable
    A short single fiber jumper cable with connectors on both ends used for testing. This cable must be made of...
  • Test Kit
    A kit of fiber optic instruments, typically including a power meter, source and test accessories used for measuring loss and...
  • Test SFP
    Test port operations in hub, board, system and other applications with SFP Electrical Loopbacks from Timbercon.
  • Test Source
    A laser diode or LED used to inject an optical signal into fiber for testing loss of the fiber or...
  • TFF
    An abbreviation for thin-film filter.
    TFOCA stands for Tactical Fiber Optic Cable Assembly. They are developed to be extremely strong and rugged so as to...
  • TFOCA II Connectors
    TFOCA II Connectors are military style fiber optic connectors designed for rugged use in harsh environments. TFOCA stands for Tactical...
  • Thermal Lensing
    Lensing effect induced by temperature gradients.
  • Thermal Noise
    Noise resulting from thermally induced random fluctuation in current in the receiver's load resistance.
  • Thermal Stability
    A measure of the insertion loss variation as the device undergoes various environmental changes.
  • Thermistor
    A temperature-sensing element composed of sintered semiconductor material, which exhibits a large change in resistance proportional to a small change...
  • Thermocouple contact
    A contact made of special material, used in connectors in high temperature applications as a means of measuring temperature electrically.Materials...
  • Thermoelectric Cooler
    s a semiconductor heat pump which ulilizes the Peltier effect. The TEC operates as follows: For ambient temperature greater than...
  • Thermooptic Switches
    Optical switches controlled by temperature-induced changes in refractive index.
  • Thick Wall Tubing
    Quartz or silica tubing which has a large OD to ID ratio. It can have a very small inside diameter (e.g.,...
  • Thin Disk Lasers
    Solid state bulk lasers having a very thin disk of laser-active material as gain medium.
  • Thin Film Optical Waveguide
    A slab-dielectric waveguide that consists of multilayered films of material of different optical characteristics, is capable of guiding an optical...
  • Third Order Dispersion
    Dispersion related to a third-order dependence of the phase change on the frequency offset.
  • Third Window
    Of silica-based optical fibers, the transmission window at approximately 1.55 m. Note: The third window is the minimum-loss window in...
  • Threaded coupling
    A means of coupling a mating pair of connectors by engaging threads on the exterior of a receptacle with interior...
  • Threshold Current
    The minimum current needed to sustain laser action in a diode laser.
  • Threshold Power
    The optical output power at threshold current.
  • Threshold Pump Power
    The pump power for which the laser threshold is reached.
  • Thresholdless Lasers
    Lasers with a threshold power which is virtually zero.
  • Throughput Loss
    In a fiber optic cable coupler it is the ratio of power at the throughput port to power at the...
  • TIA
    An acronym for Telecommunications Industry Association.
  • TICL
    Abbreviation for temperature induced cable loss. Optical loss as a result of extreme temperatures outside a fiber optic cable’s environmental...
  • Tight Buffer
    Type of cable construction whereby each glass fiber is tightly buffered by a protective thermoplastic coating to a diameter of...
  • Tight Buffered Cable
    A protective coating extruded tightly over fiber for mechanical and environmental protection. The coating material is either nylon or PVC....
  • Time Bandwidth Product
    Product of temporal and spectral width of a pulse.
  • Time Division Multiplexing
    A multiplexing technique operating in the time domain.
  • Time Domain Reflectometer
    See Optical Time-Domain Reflectometer (OTDR).
  • Time of Flight Measurements
    Time-of-flight measurements are often used for measurement of some distance, e.g. with a laser range finder, used e.g. in an...
  • Time To Failure
    This term applies only to gradual failures. In general, the characteristics (e.g. optical power, threshold current, operating current) of the...
  • Time-Division Multiplexing (TDM)
    A transmission technique whereby several low-speed channels are multiplexed into a high-speed channel for transmission.
  • Timing Jitter
    Fluctuations of the temporal positions of pulses.
  • Timing Phase
    A phase reflecting timing deviations by relating them to the pulse period.
  • Titanium Sapphire Lasers
    Lasers based on a Ti:sapphire gain medium.
  • Token Ring
    The IEEE 802.5 Token Ring protocol provides a deterministic method of shared media access. Two standards exist, one with 4-Mbit/sec operation...
  • Tolerance
    Amount of variance from a standard that is allowed.
  • Topology
    The physical layout of a network
  • Total Bandwidth
    The combined modal and chromatic bandwidth.
  • Total Internal Reflection
    Total internal reflection is an optical phenomenon that occurs when a ray of light strikes a medium boundary at an...
  • Tracking Error
    s a ratio of fiber-coupled power at two different case temperatures measured in dB.
  • Transaction Monitors
    Systems that control access to databases to ensure consistency, integrity and recovery. A new generation of products that perform this function...
  • Transceiver
    An instrument or system capable of both transmitting and receiving a signal.
  • Transducer
    A device for converting energy from one form to another, such as optical energy to electrical energy.
  • Transform Limit
    The minimum pulse duration possible for a given optical spectrum.
  • Transistor
  • Transition Metal Doped Gain Media
    Lasers based on gain media which are doped with transition metal ions.
  • Transmission
    In optics, the passage of radiant energy (light) through a medium.
  • Transmission Loss
    Loss associated with light attenuation during transmission.
  • Transmission Loss
    Total loss encountered in transmission through a system.
  • Transmission Media
    Anything such as wire, coaxial cable, fiber optics, air, or vacuum, that is being used to carry an electrical signal which...
  • Transmittance
    The ratio of transmitted radiant energy to incident radiant energy, or the fraction of light that passes through a...
  • Transmitter
    In fiber optic communications, a light source whose beam can be modulated and sent along an optical fiber, and the...
  • Transmitter Central Wavelength
    In optical communication, the total allowed range of transmitter central wavelengths caused by the combined worst-case variations due to manufacturing,...
  • Transmitter XMTR
    A device which includes a LED or laser source and signal conditioning electronics that is used to inject a signal...
  • Transparent
    Describes the operation of a network such that a user is unaware that a service is being provided by the network;...
  • Transparent Network
    A fiber-optic network that is entirely light based with optical switches and other optical-only devices.
  • Transponder
    Also called Transceiver with MUX and DEMUX. An integrated device that integrates laser source, detector, MUX and DEMUX in one...
  • Transport Layer
    The fourth layer of the OSI model of data communications. High level quality control (error checking) and some alternate routing is...
  • Transverse Electric Mode
    A mode whose electric field vector is normal to the direction of propagation. Note: TE modes may be useful modes...
  • Transverse Magnetic Mode
    A mode whose magnetic field vector is normal to the direction of propagation. Note: TM modes may be useful in...
  • Transverse Modes
    Modes across the width of a waveguide (e.g., a fiber or laser). Distinct from longitudinal modes, which are along the...
  • Traveling Wave
    A wave that (a) propagates in a transmission medium, (b) has a velocity determined by the launching conditions and the...
  • Tray
    A unit or assembly of units or sections, and associated fittings, made of metal or other noncombustible materials forming a...
  • Tree
    A network architecture in which transmission routes branch out from a central point.
  • Tree Coupler
    A passive fiber optical component in which power from one input is distributed to more than two output fibers.
  • Triangulation
    Triangulation is a method for distance measurements, often using a laser.
  • Trunk
    In a fiber optic communications network, a circuit that connects two switching centers and does not branch off to terminal...
  • Trunk
    Trunk Line. A communication link running between telephone company central offices. Also a communication link that connects a customer location...
  • Trunk Cable
    Fiber optic cable providing physical conduit, pipeline, or circuit for a trunk connection in a fiber optic communication network. Any...

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