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!http://www.fiberoptics4sale.com/wordpress/wp-content/uploads/2009/06/opticalfibercoatingprocess.gif|border=1! _Fig. 7. Coating the fiber_ *_\[3\]_* |
Test & Measurement
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Then the drawn fiber goes through compulsory tests, where all optical and geometrical parameters are checked to meet strict quality requirements.
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!http://www.flukenetworks.com/sites/flukenetworks.com/files/assets/FT_FiberTestSimpliFiber.jpg|border=1! _Fig. 8. Fiber testing in environment_ *_\[7\]_* |
Tensile strength of fiber is tested first: reel of drawn fiber is clamped through a series of capstans and loaded to test the minimal tensile strength required. The fiber is then placed onto reels for distribution and separated equally to required lengths.
Next fiber is tested for any faults using Optical Time Domain Reflectometer (OTDR), which manipulates dispersed light to indicate the exact point of defects along the whole length.
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_Geometrical parameters_ are tested for all types of fiber *\[1\]*: |
- core diameter
- core non-circularity
- cladding diameter
- cladding non-circularity
- coating outer diameter
- coating outer non-circularity
- coating concentricity error
- core-clad concentricity error
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!http://fwallpapers.com/files/imagecache/psp/images/optical-fiber-bokeh.png|border=1,width=250,height=142! _Fig. 9. Optical fibers_ *_\[6\]_* |
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In addition, _mechanical and environmental testing_ is also done for the fiber to comply optical and mechanical integrity of product and customer requirements *\[1\]*: |
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