FIELD: fibre- optical communication lines. SUBSTANCE: optical coupler with division of wave length has optical fiber with single core and optical fiber with double core. Dielectric filter is placed between first and second lenses that focuses light beams in one point and is intended for reflection of beams from optical fibers with double core and transmission of beams coming from optical fiber with single core. Frames for optical fibers with double core, ball lens with counter-reflecting film and case are prepared for manufacture of optical coupler on basis of calculation of displacement distance for centering of frames and lens. Each frame is anchored inside case and ball lens is pushed into case with effort specified in advance. EFFECT: improved centering of frame of ball lens, increased resistance to actions of temperature, vibration and impact loads, possibility of repeat usage of lens. 9 cl, 4 dwg
