Patent ID: 6628855
Filing Date: 2003-09-30
Classification: G02F,H04B

Abstract:
An optical device for the differentiation of two optical signals, a first signal and a second signal, the second signal being the same as the first signal but lagging behind it by a delay &tgr;, comprising:a first channel and a second channel, said first channel comprising a first medium having an optical index and a second channel comprising a second medium having another optical index, wherein the optical indexes of each of said first and second mediums vary with a characteristic of an optical signal passing through them: means of generating a continuous wave; means of making a signal present on the first channel interfere with a signal present on the second channel, an output signal from these interference means forming a difference signal between the first and the second signal; means of inputting the continuous wave on each of the two channels, wherein the first channel also comprises: a delay means placed in series with the first medium for delaying said first signal; and a means of inputting the first signal on each of the channels, the input onto the first channel taking place on the input side of the series formed by the first medium and the delay means.