четверг, 21 февраля 2019 г.
Fiber Optic Connector Assembly Essay
The three roughage geometry parameters that have the greatest impact on splicing performance include the following Cladding diameterthe outside(a) diameter of the cladding glass region. shopping mall/clad concentricity (or summation-to-cladding offset)how well the aggregate is centered in the cladding glass region fictional character cutthe amount of curvature over a fixed length of case These parameters ar determined and controlled during the fiber-manufacturing process. As fiber is cut and bondd according to placement needs, it is important to be able to count on consistent geometry on the entire length of the fiber and between fibers and not to rely all on measurements made.The cladding diameter tolerance controls the outer diameter of the fiber, with tighter tolerances ensuring that fibers argon almost exactly the same size. During splicing, inconsistent cladding diameters faecal matter grow cores to misalign where the fibers join, leading to higher splice waive res. The drawing process controls cladding diameter tolerance, and depending on the manufacturers skill level, can be very tightly controlled. Tighter core/clad concentricity tolerances help ensure that the fiber core is centered in relation to the cladding. This sign ons the chance of ending up with cores that do not match up precisely when two fibers argon spliced together. A core that is precisely centered in the fiber yields lower- sack splices more(prenominal) often. Core/clad concentricity is determined during the first stages of the manufacturing process, when the fiber design and upshoting characteristics argon created.During these lay down and consolidation processes, the dopant chemicals that make up the fiber must be deposited with precise control and symmetry to maintain consistent core/clad concentricity performance throughout the entire length of fiber. Fiber scroll is the inherent curvature along a specific length of ocular fiber that is exhibited to some degree by all fibers. It is a result of thermal stresses that occur during the manufacturing process. Therefore, these factors must be rigorously monitored and controlled during fiber manufacture. Tighter fiber-curl tolerances reduce the possibility that fiber cores will be misaligned during splicing, at that placeby impacting splice loss. almost mass fusion splicers persona fixed v-grooves for fiber alignment, where the effect of fiber curl is most noticeable.When fibers argon manufactured within specified tolerances, in that location are still slight variations from one visual fiber to another. These variations can affect the performance of the splice even though the opthalmic fibers are perfectly aligned when mated. The variations between two optical fibers that affect splice performance are referred to as intrinsic factors. One factor is the mathematical aperture mismatch this occurs when the NA of one optical fiber is unalike from the NA of the other optical fiber. If the NA o f the transmitting fiber is larger than the NA of the receiving optical fiber a loss may occur. The exact loss from an NA mismatch is difficult to await.Factors such as light witnesser type, light source launch condition and optical fiber length, and change shape in the optical fiber all affect the potential loss. another(prenominal) factor could be a core diameter mismatch this occurs when there is a difference in the core diameters of the two opticasl fibers. A core diameter mismatch loss results when the core diameter of the transmitting optical fiber is greater than the core diameter of the receiving optical fiber. You can calculate the worst case loss percentage for a splice that joins different diameter fiber with a formula. You then can also use another formula to calculate the decibel loss. There is also noncercularity that is a intrinsic factor that causes loss. The noncircularity of the core will cause a loss when light from the core of the transmitting optical fiber e nters the cladding of the receiving optical fiber. A way to make sure that connections are not preoccupied when splicing is make sure the alignment of the ellipticities of the two cores.Some of the external factors that affect optical fiber splice performance are factors tie in to the condition of the splice itself. One of the factors is lateral misalignment this occurs when the two optical fibers are offset. Lateral misalignment loss occurs when light from the core of the transmitting optical fiber enters the cladding of the receiving optical fiber. This can be avoided by paying shutdown attention when connecting the two sections together. If the optical fibers in a splice construe each other at an angle a loss from angulate misalignment may occur. The amount of loss depends the severity of the angular misalignment and the acceptance cones of the transmitting and receiving optical fibers. The best way to avoid this is tomake sure each end is touching completely before spliced together.