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Special-purpose fiber - Polarization-maintaining fibers written by Hai 

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Principle of operation - Special purpose fiber  - http://en.wikipedia.org/wiki/Optical_fiber

Multimode fibers - http://www.rp-photonics.com/multimode_fibers.html^{Image Removed}

The basic of fiber optic cable (single mode and multi mode) -http://www.arcelect.com/fibercable.htm^{Image Removed}

Single mode vs Multi mode fiber optic cable  -http://www.multicominc.com/active/manufacturer/multicom/Fiber%20Optics/singlemode-multimode.html^{Image Removed}