摘要：

An optical device (D) is dedicated to the transformation of the propagation mode of optical signals. This device comprises at least a first mode converter () that is supplied with signals that are propagated in a first guided mode and that delivers the signals in a multimode fibre () partly in the first guided mode and partly in a second guided more of a higher order that the first. The multimode fibre () comprises at least first passive filtering means (R) which have the task of converting the first guided mode into at least one dissipative cladding mode in order to prevent or limit the propagation of the signals in this first guided mode while at the same time authorising the propagation of the signals having the second guided mode in the multimode fibre ().

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