METHOD OF MANUFACTURE OF FIBER LIGHT CONDUITS RETAINING RADIATION POLARIZATION Russian patent published in 2006 - IPC C03B37/18 

FIELD: fiber optics; manufacture of single-mode fiber light conduits at high double refraction used in information transmission systems and interferometric sensors of physical fields.

SUBSTANCE: proposed method increases ellipticity of straining envelope and high-temperature treatment of blanks. Proposed method includes obtaining blanks of fiber light conduits by application on inner surface of quartz tube layers of quartz glass alloyed with P₂O₅ together with fluorine by chemical vapor-phase deposition method, straining envelope, insulating envelope and layer of core, collapsing tube into molding fillet, abrasive treatment of diametrically opposite outer sides of blank-molding fillet by cutting symmetrical grooves along axis over entire length, 0.3-1 mm deep at depth sufficient for penetration in layer of protective envelope so that gap between bottom of groove and straining envelope is formed; then it is subjected to holding in hydrofluoric acid solution till width of groove in layer of protective envelope increases by 2-2.5 times after which blank is subjected to rounding and light conduits are drawn. Prior to drawing light conduits, blanks shall be annealed in air atmosphere at temperature of 900-1000°C for 4-10 h.

EFFECT: enhanced retaining of radiation polarization; reduced optical losses of light conduits.

2 cl, 2 dwg, 1 ex