H - Electricity – 04 – B
Patent
H - Electricity
04
B
345/56
H04B 10/24 (2006.01) G02B 6/34 (2006.01)
Patent
CA 1154137
PHD. 79-047 13 ABSTRACT: A device for coupling a first optical signal of a first wavelength into a transmission glass-fibre and for coupling out a second optical signal, which has at least a second wavelength which differs from the first wavelength and which travels in the transmission glass-fibre in a direction opposite to that of the first optical signal, the optical signals to be coupled in and coupled out travelling in spatially separated further glass fibres comprising an imaging device arranged between the transmission glass- fibre and the further glass fibres, in whose pupil a binary optical grating is disposed, further glass fibres receiving the second optical signals which have been diffracted into the diffraction orders of the grating. The grating takes the form of a phase grating and is arranged on an optical axis which it has in common with the imaging device, It has a duty factor of at least substantially 1: 1 as well as an optical path difference of substantially H = (N-1) h = n1 .lambda. I, where nl , 1,2,3,... and in addition substantially complies with the requirement (N-l)h = (m1 + ?) .lambda. k where m1 = 0, 1, 2, ... and k = II, III, ...
349580
Dammann Hans
Killat Ulrich
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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