Insertion Loss (IL): - Attenuation expressed in dB for a particular path through a component.
#Difference between optical isolator and circulator free#
Index of Refraction - The ratio of the velocity of light in free space to the velocity of light in a given material.
Fused Coupler - A method of making a multimode or single-mode coupler by wrapping fibers together, heating them and pulling the fibers to form a central unified mass so that light on any fiber is coupled to all output fibers. Excess Loss - The ratio of the total output power of a passive component with respect to the input power. Erbium - doped fiber amplifier- A type of fiber that amplifies 1550-nm optical signals when pumped with a 980- or 1480-nm light source. Demultiplex - The process of separating optical channels. Directivity - Also referred to as near-end crosstalk, it is the amount of power observed at a given input port with respect to an initial input power. The three types are modal, material, and waveguide. Dispersion - A general term for those phenomena that cause a broadening or spreading of light as it propogates through an optical fiber. Decibel - A standard logarithmic unit for the ratio of two powers, voltages, or currents. dB (Decibel) - Unit of measurement of signal strength. Coupling Ratio - The percentage of light transferred to a receiving output port with respect to the total power of all output ports. (Can be in various ratios.) Commonly called a splitter. Coupler - A passive device that distributes optical power among two or more ports. Core - The central, light carrying part of an optical fiber it has an index of refraction higher than that of the surrounding cladding. Cladding - The outer concentric layer that surrounds the fiber core and has a lower index of refraction. Center Wavelength(s) - The nominal operating wavelength(s). 
CWDM - Coarse Wavelength-Division Multiplexing.Bandpass - A range of wavelengths over which a component will meet specifications.
Bend Loss - The result of macrobends (curvature of fiber) or microbends (small distortions in the fiber ) producing increased attenuation by coupling light energy from the fiber core to the cladding.Attenuator - A passive optical component that intentionally reduces the optical power propagating in a fiber.A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
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