WDM LAN Optical Backbone Networks phần 2 potx

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What fiber provides

 Fiber is light, small …

 Fiber itself is immune to EMI & HPM

 No cable radiation

 Fiber provides tremendous bandwidth

 Telecom wavelengths ≈ 193 THz (carrier frequency)

 Telecom amplifiers allow aggregate bandwidth of several terabits on a

single fiber

 Individual telecom wavelength channels now carry 10 – 40 Gb/s

 Fiber carries high bandwidth signals with

 Extremely low loss: ≈ 0.2 dB/km independent of signal rate or format

 Extremely low distortion

 Fiber is “transparent” … and that allows WDM

Transparency means:

 Signals do not interact in the fiber (to first order)

 Ability to carry signal does not depend on rate, format, polarization …

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