Fiber Optic Glossary : B

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  • B Constant
    Thermistor constant used in temperature sensor when ATC is operating.
  • B Integral
    Calculates the exponential growth of the least stable spatial frequency in a laser beam, and is the numerical equivalent of...
  • Back Channel
    A channel for communication with the source in an otherwise unidirectional network, such as a channel that provides interactive features...
  • Back mounted
    Rear mounted – a connector with its mounting flange mounted inside of a panel or box.
  • Back Reflection Optical Return Loss
    Light reflected from the cleaved or polished end of a fiber caused by the difference of refractive indices of air...
  • Backbone
    A transmission network that carries high speed telecommunications between locations. This is normally the main portion of a telecommunication network,...
  • Backbone Cabling
    The inter-building and intra-building cable connections between entrance facilities, equipment rooms and telecommunications closets. Backbone cabling consists of the transmission...
  • Backbone System
    A transmission network that carries high-speed telecommunications between regions (e.g., a nationwide long-distance telephone system). Sometimes used to describe the...
  • Backreflection (BR)
    In cases where light is launched into an optical fiber, backreflection refers to the light that is returned to the...
  • Backscattering
    The scattering of light in a fiber back toward the source, used to make OTDR measurements.
  • Balanced
    Signaling code with an equal number of high and low states.
  • Bandgap
    In a semiconductor material, the minimum energy necessary for an electron to transfer from the valence band into the conduction...
  • Bandpass
    The range of frequencies that will pass through a filter or other device. Synonymous with passband.
  • Bandpass Filter
    A filter with a transmission that is high for a particular band of frequencies, but that falls to low values...
  • Bandwidth
    The information carrying capacity of the system. In analog systems, this is also the highest frequency that can be...
  • Bandwidth BW
    The range of signal frequencies or bit rate within which a fiber optic component, link or network will operate.
  • Bandwidth Distance Product
    Of an optical fiber, under specified launching and cabling conditions, at a specified wavelength, a figure of merit equal to...
  • Bandwidth Limited Operation
    In fiber optics, the limitation on performance imposed by the system bandwidth rather than the amplitude of the signal.
  • Bandwidth Limited Pulses
    Pulses with a duration as short as possible with their optical spectrum.
  • Barrier Layer
    In the fabrication of an optical fiber, a layer that can be used to create a boundary against OH-ion diffusion...
  • Baseband
    The simplest method of transmission on a local area network. The entire bandwidth of the cable is used to transmit...
  • Baud
    The number of signal level transitions per second in digital data. The term is often confused with bits per second....
  • Baud Rate
    Measurement of data transmission speed, expressed in bits per second or bps.
  • Bayonet coupling
    A quick coupling mechanism for mating a plug onto a receptacle utilizing three equally spaced pins protruding from the receptacle...
  • BB I
    Abbreviation for broadband interactive services. The delivery of all types of interactive video, data and voice services over a broadband...
  • Beacon Token Process
    A process defined by SMT used to locate ring failures. When a station notes such a failure, it enters the...
  • Beam Attenuator
    A device designed to decrease flux density or power per unit area of a light beam through absorption and scattering...
  • Beam Bender
    A mirror used to manipulate the beam in a laser system.
  • Beam Combining
    A class of techniques for power scaling of laser sources by combining the outputs of multiple devices.
  • Beam Diameter
    The distance between two diametrically opposed points at which the irradiance is a specified fraction of the beam's peak irradiance;...
  • Beam Divergence
    The increase in beam diameter with increase of distance from the source.
  • Beam Expander
    A system of optical components designed to increase the diameter of a radiation beam.
  • Beam Optics
    A discipline within the broad study of optics that is specifically oriented toward the investigation of waves with small angular...
  • Beam Parameter Product
    Product of the beam radius in a focus and the far-field beam divergence.
  • Beam Pointing Fluctuations
    Fluctuations of the propagation direction of a laser beam.
  • Beam Positioner
    A device (e.g., prisms, lenses, tubes) used to align a beam in a system.
  • Beam Profilers
    Devices for measuring the intensity profile of a laser beam.
  • Beam Quality
    A measure for how well a laser beam can be focused.
  • Beam Radius
    A measure of the transverse extension of a light beam.
  • Beam Shapers
    Optical devices for modifying the shapes of laser beams.
  • Beam Waist
    Location with minimum beam radius.
  • Beamsplitter
    An optical device for dividing for dividing a beam into two or more separate beams. A simple beamsplitter may be...
  • Beamsplitting Block
    A glass block that produces stationary fringes in the region crossed by incident light beams.
  • Beat
    The signal formed when two signals, such as light waves, of different frequencies are present simultaneously in a nonlinear device....
  • Beat Length
    A characteristic of optical fiber used to calculate the fiber's ability to maintain polarization. The beat length describes the length...
  • Beat Note
    An oscillation of the optical intensity arising from the superposition of light with different optical frequencies.
  • Beauty Defect
    A defect on or in an optical element that does not appreciably impair the function of the surface.
  • Bel (B)
    The logarithm to the base 10 of a power ratio, expressed as B = log10(P1/P2), where P1 and P2 are...
  • Bend Loss
    1. A form of increased attenuation in a fiber that results from bending a fiber around a restrictive curvature (a macrobend)...
  • Bend Radius
    The radius of curvature that an optical fiber can bend without sustaining damage.
  • Bending of Light
    The action occurring when light passes through an optical interface at other than normal incidence, i.e., refraction.
  • BER Bit Error Rate
    Bit Error Rate. The number of bit errors that occur within the space of one second. This measurement is one of...
  • BER Floor
    A limiting of the bit-error ratio (BER) in a digital fiber optic system as a function of received power due...
  • Bias
    (1) To influence to a single direction; (2) Voltage that is applied to a solid-state device.
  • Biconic
    A connector type which has a taper sleeve which would be fixed to the fiber optic cable. When this plug...
  • Biconic Connector
    A type of fiber optic connector consisting of two cone-shaped ferrules aligned by a mating sleeve.
  • BIDI
    Abbreviation for bidirectional transceiver, a device that sends information in one direction and receives information from the opposite direction.
  • Bidirectional
    The ability for light to transmit in both directions through a fiber.
  • Bifurcated Fiber
    A branched fiber optic lightguide that performs both receiving and transmitting functions.
  • BIN code
    Basic identification number - color bands on the wire barrel end of a contact to identify contact part number. Each...
  • Binary
    A numbering system that allows only two values, zero and one, '0' and '1'. Binary is the way most computers store...
  • Birefringence
    The separation of a light beam, as it penetrates a doubly refracting object, into two diverging beams, commonly known as...
  • Birefringent
    Having a refractive index that differs for light of different polarizations.
  • Birefringent Phase Matching
    A technique of phase matching based on the birefringence of a crystal material.
  • Birefringent Tuners
    Device for wavelength tuning of lasers based on birefringence and polarization rotation.
    An abbreviation for broadband integrated services digital network.
  • Bit
    An electrical or optical pulse that carries information.
  • Bit Depth
    The number of levels that a pixel might have, such as 256 with an 8-bit depth or 1,024 with a...
  • Bit Error Rate (BER)
    In digital applications it is the ratio of bits received in error to bits sent. BERs of 10-9 (one error...
  • Bit Period (T)
    The amount of time required to transmit a logical one or a logical zero.
  • Bit Rate
    1. The number of bits of data transmitted over a phone line per second. You can usually figure how many characters...
  • BITE
    Abbreviation for built-in test equipment.Features designed into a piece of equipment that allow on-line diagnosis of failures and operating...
  • Block
    A collection of transmitted information which is seen as a discrete entity. Usually has its own address, control, routing and...
  • Blocking
    A connection can't be made. A call can't be completed. These are many reasons for blocking. Sometimes not enough equipment. Sometimes...
  • Blue Lasers
    Lasers emitting blue light.
  • BNC
    Popular coax bayonet style connector, often used for baseband video.
  • Boot
    A form placed onto the boot adapter used to environmentally seal and/or strain-relieve a cable assembly.
  • Boot adapter
    A mechanical device with one side threaded onto the accessory thread of a connector (plug or receptacle) and the other...
  • Bound Mode
    In an optical fiber, a mode that (a) has a field intensity that decays monotonically in the transverse direction everywhere...
  • BPON
    An abbreviation for broadband on passive optical network.
  • Bps
    Bits per second. Term used by telecommunication engineers to describe bandwidth. Bytes per second is the term used by software...
  • Bragg Grating
    A filter that separates light into many colors via Bragg's law. Generally refers to a fiber Bragg grating used in...
  • Bragg Method of Crystal Analysis
    A technique in which a beam of x-rays is directed against a crystal, the atoms of which, because of their...
  • Bragg Mirrors
    Mirror structures based on Bragg reflection at a period structure.
  • Bragg Scattering
    Scattering of light caused by a change in refractive index, as used in Fiber Bragg Gratings and Distributed Bragg...
  • Bragg's Law
    The law expressing the condition under which a crystal will reflect a beam of x-rays with the greatest amount of...
  • Braid
    An essential part of many fiber-optic cable designs, consisting of a layer of woven yarn. Note: In the case of...
  • Break Out
    To separate the individual fibers or buffer tubes of a fiber optic cable for the purpose of splicing or installing...
  • Break Out Cable
    Same as a Fan Out cable. This is a multiple fiber optic cables constructed in the tight buffered design. It...
  • Break Out Kit
    Used to build up the outer diameter of fiber cable for connecting.
  • Breakdown Voltage
    In avalanche photodiodes, the point at which an increase in the reverse bias voltage causes the current gain to approach...
  • Breakout Cable
    A type of fiber optic cable containing several fibers, each with its own jacket and all of them surrounded by...
  • Brewster Plates
    Coplanar plates inserted into beams at Brewster's angle.
  • Brewster Windows
    Transparent plates which are oriented at Brewster's angle.
  • Bridge
    A MAC-level store-and-forward network node. Bridges are used to interconnect LAN segments, thus creating extended LANs. They filter (drop) or forward...
  • Brightness
    The visual sensation of the luminous power of a light beam, as opposed to scientifically measured power of the...
  • Brightness Converters
    Optically pumped devices where the generated optical output has a higher brightness than the optical pump source.
  • Brillouin Scattering
    A nonlinear scattering effect involving acoustic phonons.
  • Broad Area Laser Diodes
    Laser diodes with a strongly asymmetric shape of the emitting region.
  • Broadband
    Indicating a capability to deal with a relatively wide spectral bandwidth; high-speed data transmission in which a single cable can...

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