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...east-expensive method of constructing digital logic. Improvements in this technology have driven all subsequent improvements in cost. ...10⁹ hertz), and some laboratory systems switch at more than a [[terahertz]] (1×10¹² hertz).

Comb generators find wide range of uses in [[microwave]] technology. E.g., synchronous signals in wide frequency bandwidth can be produced by a ...lity of generating hundreds of [[sideband]]s with total span of at least 3 terahertz (limited by the [[optical dispersion]] of the [[lithium niobate]] crystal)

...onal Bureau of Standards]] (NBS, now [[National Institute of Standards and Technology|NIST]]). It was less accurate than existing [[quartz clock]]s, but served t |publisher=[[National Institute of Standards and Technology|NIST]]