CHIRPED MICROSTRUCTURAL WAVEGUIDE AND PREPARATION METHOD THEREOF Russian patent published in 2017 - IPC G02B6/00 

FIELD: nanotechnology.

SUBSTANCE: invention relates to nanotechnology, in particular to production of optical fibre. Chirped photonic-crystal fibre consists of a central wave guide core and a structured cladding in form of an array of capillaries, diameters of which increase from centre to periphery. Centres of capillaries increasing on diameter are located on radial axis of central core, and lines drawn through contact point and centres of capillaries, form equilateral trapeze. Structured cladding additionally includes an array of more rigid glass retaining capillaries or insert cylinders, filling space between working capillaries, wherein sizes of inserts also increase from centre to periphery. Method of making chirped photonic-crystal fibre involves heating an initial workpiece and drawing pipes and cylinders of required diameters, assembling stacks of a certain topology and neck in fibre. With help of guide tube, length of which is 1/4–1/5 of length of assembled stack, a hollow core is formed. Further, method includes attaching on guide tube a first row of working capillaries laid along its edge, in gaps between touching working capillaries is laid and attached a first row of retaining capillaries. Similarly, next rows of working and retaining of capillaries are formed. Assembled stack is placed into a support tube, secured by retaining capillaries, and is drawn into a fibre with required parameters.

EFFECT: broader functional capabilities of assembly of structures of microstructured fibres, as well as reduced dispersion.

2 cl, 3 dwg