Optical guidance structure comprising a monomode input guide having a particular direction (De), two monomode output guides having directions (Ds.sub.1, Ds.sub.2) symmetrically inclined with respect to the direction (De) of the input guide and a widened junction zone between the input guide and the output...http://www.google.fr/patents/US4747654?utm_source=gb-gplus-shareBrevet US4747654 - Optical monomode guidance structure including low resolution grating
Optical monomode guidance structure including low resolution grating
