Alternate Optics Fiber Learning

Does anyone here know where can I get useful forums/website sharing optic fiber information ?
I'm finding difficulty to understand.

Linspire

Some info........
google find more.........

Optical Fiber Articles about LightTransmission for Video, Audio, Data using Analog Digital L-Band HDTV 1080 and more - Fiber-Optics.info

The Fiber Optic Association

http://www.dte.upct.es/personal/manu...ibraoptica.pdf

Fiber Optic Cable single-mode multi-mode Tutorial

http://www.imedea.uib.es/~salvador/c...iber_optic.pdf

Fiber Optic Technical Support