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What is Cao’s Law? June 11, 2009

Posted by HubTechInsider in Definitions, Fiber Optics, Telecommunications.
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Cao’s Law states that the communications spectrum is virtually infinite and that WDM (Wave Division Multiplexing) will allow the information transmitted upon the available spectrum to expand exponentially as the growth of transistors in Moore’s Law. Using less and less power, WDM will allow finer and finer channels of light to transmit more and more data. Cao’s Law states that these lambdas will expand at a rate two to three times the rate of expansion of transistors on an integrated circuit chip as in Moore’s Law. On optical fibers, as opposed to the tradeoffs between power and connectivity in the transistor world, in the optical realm, the tradeoff is between bitrate and channel count. To this point of the technology’s development, we can either pump a high bitrate on each channel or we can transmit lots of channels, but we cannot do both of these things at the same time. Among telecom carriers today, there seems to be a manifestation of Simon Cao’s Law in action in the real world.

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