SMF (Single-mode Fiber)
• Narrow core through which laser-generated light travels over one path, reflecting very little
    – Accommodates high bandwidths and long distances 
     – Expensive
 MMF (Multimode Fiber)
• Benefits over copper cabling:
   –Nearly unlimited throughput 
   –Very high resistance to noise 
   –Excellent security
   –Ability to carry signals for much longer distances before requiring repeaters than copper cable 
   –Industry standard for high-speed networking
• Throughput: transmission rates exceed 10 Gigabits per second
• Cost: most expensive transmission medium 
• Connector: 10 different types of connectors  –Typically use ST or SC connectors 
• Noise immunity: unaffected by EMI
• Size and scalability: segment lengths vary from
  150 to 40,000 meters 
      –Optical loss: degradation of light signal after it travels a certain distance away from  its source