Abstract: The invention relates to an interferometric system (2) for selection of spectral components of an incident optical beam as a function of their wavelength, comprising: means (42) of transforming the said incident optical beam into two spatially demultiplexed beams; means (43) of shifting the phase of at least one of the said spatially demultiplexed beams, the phase shift being applied spatially so as to produce two so-called phase shifted beams, the phase of at least one of their components being shifted as a function of its wavelength; means (44, 42) of recombining the said phase shifted beams adapted to produce a first and a second output beam, each of the said output beams being multiplexed in wavelength and comprising components of the said phase shifted beams, selected as a function of a first and a second phase shift respectively.

Abstract: Connection device for multiple-core optical fibers based on optical elements in free space. This device comprises a first optical means (36) which is refractive or diffractive, and at least one second means (38, 40) which is diffractive. The first means causes the light beams exiting cores (30) of fiber (28) to diverge as far as an area in which these beams are separated in space and have cross sections whose size is compatible with the spatial bandpass of the second means. The latter is positioned in this area and directs the beams, independently from one another, towards corresponding optical components (34). Application to optic telecommunications.