Digital Level

Fiber Optic Digital or Analog?

Hi there, I was wondering if Fiber Optic (light rays) is Analog signals or Digital signals. The Fiber Optic cable am talking is the cable from your ISP to your home, also another FO cable which connect from hub to server. Please support your answer. I thought it was Digital because it needs a modem to make the Lan line/phone working. Thank You

Fiber optics transport digital data only for most communications means especially for computing and network services.

There are analog fiber optics sensors that are able to sense optical resolutions (quantization) for analog applications, but are not typically for communications.

All communication forms of fiber optics is based upon light transmissions into an optical fiber that uses total internal reflection to transport the light, but use analog-to-digital quantization of the light into discrete digital levels (high or low states).

http://en.wikipedia.org/wiki/Fiber_optics

http://en.wikipedia.org/wiki/Quantization_(signal_processing)

Even Wavelength Division Multiplexing (WDM) that uses different wavelengths of light is used for digital data communications, but uses analog optical methods to separate the light into discree wavelengths.

http://en.wikipedia.org/wiki/Wavelength-division_multiplexing

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