Process for manufacturing a monomode optical waveguide made of a polymer and endowed with electrooptic properties, and such an optical waveguide

A process for manufacturing a monomode cylindrical optical waveguide made of a polymer, such a waveguide permitting a modulation, by electrooptic effect, of the light wave which it transmits, which comprises the following steps:

• producing a cylindrical core rod (11) by polymerization of a polymerizable mixture comprising especially a core polymer and an electrooptically active organic substance such that the core exhibits an optical activity under the action of an external electric field,
• forming a first preform (10) by coating the cylindrical core rod (11) by means of an optical cladding (12) formed by a cladding polymer,
• fitting said first preform (10) into a first jacket (20) constituted by a jacket polymer,
• producing a second preform (30) by partial drawing of the first jacket (20) containing the first preform (10),
• fitting the second preform (30) into a second jacket (40) made of a jacket polymer,
• fiber drawing the second jacket (40) thus prepared until the core diameter (d.sub.c) has the required dimension in order for the optical waveguide obtained to be monomode,
• producing electrodes (51, 52) for polarization and excitation of the electrooptically active substance.