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Home > Cable Assembly,Cable Plant,Chromatic Dispersion,Cladding,Duplex Cable

Cable Assembly (fiber optic):  A cable that is terminated on both ends with connectors.


Cable Plant (fiber optic):  All of the components between the transmitter and the receiver.


Chromatic Dispersion:  A reduction in the bandwidth of a fiber caused by different wavelengths of light traveling at different speeds through the fiber. 


Cladding:  The material that surrounds the core material in an optical fiber.  The cladding has a lower index of refraction than that of the core causing the light beam to reflect and travel into the core.


Cleave:  A process by which the fiber is nicked to produce a controlled fracture of the glass, resulting in a clean, flat, smooth end that is nearly perpendicular to the fiber axis.


CWDM (Coarse Wavelength-division Multiplexing):  Stacking 8 or fewer channels within the 1550nm region of optical fiber.


Coating:  The material surrounding the cladding of an optical fiber, protecting it from damage.


Concatenation:  Connecting multiple pieces of fiber.


Concentricity (optical fiber):  The measurement of the offset between the center of the core and the center of the cladding.


Concentricity (fiber optic connector):  The measurement of the offset between the center of the connector ferrule and the center of the connector hole in the ferrule.


Connector (fiber optic):  A mechanical device that allows for connection and disconnection between two fibers (or fiber and source or fiber and detector).


Core:  The portion of the fiber that transmits light.  The core has a higher index of refraction than the cladding.


Coupler:  An optical device that combines or splits power between optical fibers.


dB (Decibel):  A unit of measurement of relative power on a logarithmic scale.


dBm:  Abbreviation to decibel relative to milliwatt.


Dense Wavelength Division Multiplexing (DWDM):  The transmission of many closely spaced wavelengths in the 1550nm region over a single fiber.


Detector (fiber optic):  The opto-electric device that converts an optical signal into electrical current.


Diameter mismatch loss:  Attenuation caused by mating two optical fibers having different core diameters, when the light is propagated from the large core into the small core.


Dielectric:  A substance which does not conduct or transmit electrical current (in fiber optics, this usually refers to cable with no metallic materials).


Dispersion:  The spreading of a light signal in an optical fiber caused by light signals traveling at different speeds through the fiber, due to either modal or chromatic effects.


Dispersion-shifted Fiber (DSF):  A type of singlemode fiber designed to have zero dispersion near 1550nm.


Dual-window fiber:  Fiber optimized to operate at more than one wavelength (typical multimode at 850nm and 1300nm and singlemode at 1310nm and 1550nm).


Duplex Cable:  A cable with two fibers, typically designed for interface between transmission equipment and cable plant (transmit/receive).