Abstract
ABSTRACT Coherence modulation of light consists in coding a signal as an delay greater than thecoherence length of light. It makes use of interferometers powered by sources which exhibit a shortcoherence length. Such sources can be operated either as classical sources or quantum sources. Wedescribe some applications dealing with communications and quantum cryptography. 1. INTRODUCTION Classical coherence modulation of light' (also termed optical path-difference modulation)makes use of the so-called fringes of superposition which are produced by time correlations ofwavegroups of light emitted by a classical broadband source, i.e. by a classical source with a short coherence length. Such phenomena in broadband light can be used to imprint several signalssimultaneously on light without crosstalk as was reported these last years in fiber sensing46, in communications7' ' and, more recently, in computing12'13 As a quantum source isused, the previous mentioned fringes of superposition must be described in terms of single photoninterference. The quantum properties of light thus used open up new applications, especially in the
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