Article | REF: R358 V1

Noise in optical measurements

Authors: Jean‐Pierre GOURE, Gérald BRUN

Publication date: March 10, 1997

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3. Optical signal in the presence of noise

3.1 Introduction

Like any physical measurement, optical measurement involves extracting a signal containing information about the quantity to be evaluated. Experimentally, measurement always involves detecting an intensity (i.e. energy), using a receiver.

These measurements are temporal, when we study variations in a quantity as a function of time. The position of the detector is then fixed. Examples include variations in the intensity emitted by a source, measurements of the absorption of a medium, phase delays in a signal transmitted by an optical fiber as a function of temperature variations, and so on.

Experimentally, the measurement of a quantity is always subject to error.

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Optical signal in the presence of noise