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Abstract

A device for coupling a first optical signal of a first wavelength into a transmission glass-fiber and for coupling a second optical signal, which has a second wavelength which differs from the first wavelength, out of the fiber. The two signals travel in the transmission glass-fiber in opposite directions. The optical signals also travel in other, spatially separated glass fibers. The device includes an imaging device arranged between the transmission glass-fiber and the other glass fibers. In the pupil of the imaging device, a binary optical grating is disposed. Other glass fibers receive the second optical signals which have been diffracted into the diffractions orders of the grating. The grating is a phase grating and is arranged on an optical axis of the imaging device. It has a duty factor of at least substantially 1:1 as well as an optical path difference, H=(n-1)h, which is substantially (N-1)h=n.sub.1 .lambda..sub.I, where n.sub.1 =1, 2, 3, . . . and (N-1)h=(m.sub.1 +1/2).lambda..sub.k where m.sub.1 =0, 1, 2, . . . and k=II, III, . . .

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