bda18cfe   
   From: rrllff@yahoo.com   
      
   On May 29, 10:39 am, Joe Gwinn  wrote:   
   >   
   > The fibers need not be exactly straight, and are designed to tolerate   
   > some degree of bend tolerance.  The effect of bending is increased   
   > leakage and thus loss.  One way to "wiretap" a fiber is to wrap it   
   > tightly around a 25mm diameter rod and pick up the escaping light.   
   >   
   > One advantage of 62.5-micron (core diameter) fiber over 50-micron fiber   
   > is that the larger the core, the less the sensitivity to bending.  The   
   > fiber folk are developing a new kind of fiber where the core (which   
   > acts like a GRIN lens) surrounded by a step-index wall (which acts like   
   > a mirror - think mirage).  Anything that leaks out of the core is   
   > promptly reflected back into the core.   
   >   
   > Joe Gwinn   
      
   I thought leakage in a multimode fiber is due to scattering and that   
   single mode fibers are used for communications. Are both of these   
   incorrect?   
      
   http://www.richardfisher.com   
      
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