FORMATION OF BRAGG GRATINGS IN GERMANIUM DOPED OPTICAL FIBERS USING A PRISM INTERFEROMETER M. DOUAY, S. CANON, S. LEGOUBIN, E. FERTEIN, P. BERNAGE, P. NIAY, J.F. BAYON et T. GEORGES J. Phys. IV France, 01 C7 (1991) C7-529-C7-532 DOI: 10.1051/jp4:19917139