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Cleaved Fiber End Angle Measurement [Back]To measure the end face angle of a cleaved fiber, you must remove the connector mount and install the fiber cleave angle measurement fixture. Part number FCA-125.
Using the following formula you can calculate the number of fringes per degree of end angle. Tangent q = H / D = Nl / 2D Where:
H = The height of the fiber edge away from thereference flat.
D = The diameter of the fiber in microns.
N = The number of fringes per degree.
l = The wavelength of the light source in microns. The End-View uses a Blue LED at 0.472mm.
l / 2 = The height of one fringe = 0.236mm.
For a fiber diameter of 125mm:
Tangent 1° = (N x 0.472) ( 2 x 125 )
N = ( 0.01745 ) (250) 0.472
N = 9.24 Fringes » 10
The shape and size of the fringes, known as the fringe pattern, can provide valuable information on the topography of the end face. This can be valuable information when evaluating the quality of a cleaved fiber. It is possible to see the depth of the flaw created by the scribe blade, as well as the breaking force. The pattern formed by the fringes indicates the amount of force and if any torque was applied during the break. Cleaving tools used for splicing in the field or in the lab should be checked periodically to determine if they are performing optimally and when the scribe blade should be changed. For angles greater than 1 degree, it is difficult to obtain a fringe pattern because the fiber surface becomes to distant from the reference flat. For measuring cleave angles at higher angles such as 8 degrees an angled cleave adapter must be used. Contact your dealer for information on angled cleave adapters.
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Pine Valley Precision, Inc.
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