SU1332252A1 - Splinter of light conductors - Google Patents

Abstract

This invention relates to light. water technology and allows you to reduce losses in the branch. The end part of the common light guide 1 is made with faces .2 inclined to the axis at a certain angle if. The number of faces 2 is equal to the number of branched light guides 4. Each light guide 4 is mounted with an end surface 5 to the corresponding edge of the light guide I with a gap not less than half the maximum wavelength of the branched radiation. 2 and 3, the optical radiation transmitted through the common light guide 1 is divided in a given ratio. Through the end surfaces 5, the radiation enters the branched light guides 4, on which chamfers can be made. 2 hp f-ly, 4 ill. g (L

Description

The invention relates to light guide technology, in particular to devices for combining and branching light guides.

The aim of the invention is to reduce the loss in a splitter.

FIG. 1 shows a splitter circuit in general with two (for simplicity) branched light guides; in fig. 2 - the same, the slope of the faces at the end of the i part of the common fiber is 30, and the ends of the branched light guides are perpendicular to their axes, while the intersection of the faces of the common fiber occurs through its axis (symmetric splitter); in FIGS. 3 and 4, the same, the branched light guides have chamfers at the end.

The common light guide 1 of the splitter (Fig. 1) has faces 2 and 3, each of which is made at an angle H to the axis of the common light guide 1. This angle is chosen from the condition of total internal reflection for all modes of the radiation propagating in the common light guide 1 and does not exceed magnitude

2

- arcsin

P

Jj

NA

arcsin

n

de Pd is the refractive index of the medium in the gap between common 1 and 4 branched optical fibers; n is the index of the refractive index of the core of the common fiber 1; NA - total number aperture

  light guide 1.

In the general case, a splitter may not be symmetrical, but have a predetermined dividing factor of the output radiation, while the axis 00 passing through the vertex of the dihedral angle formed by faces 2 and 3 does not coincide with the axis XX of the total light-optical Da 1, 2 and 3 have a different area.

The branched light guides 4 generally have an inclination of the end surface 5 relative to the axis 90 ° - ij, where is the angle of inclination of the perpendicular to the end surface 5 of the branched light guide 4 to its axis. Branched light guides .4 are mounted to face 2 or 3 of common light guide 1 with a gap not less than half of the maximum width of the branched radiation wave, while the angle V between

the axes of the branched 4 and common 1 fibers

to minimize losses sos-) -I / - arcsin (- cos 3 h)

n.

+ arcsin (- sin)

o

where n is the refractive index of the core of the branched light guide 4.

In order for the branched light guides 4 to be brought closer to the common light guide 1 by a distance of close, but not less than A / 2, and thus to achieve the minimum signal attenuation in the gap, one or both of the light branched light guides 4 are chamfered 6.

Splitter fiber works as follows.

When executing. The signal from the common light guide 1 to the branched light guide 4, the optical radiation, having reached the edges 2 and 3 of the common light guide 1, is divided in a given ratio, undergoes full reflection of these edges x 2 and 3. out of the common fiber 1 through protivopolozhnye faces 3 and 2, respectively. Then, the radiation enters through the end surfaces 5 into the branch light-guides 4 arranged in such a way that their axes coincide with the axes of the radiation fluxes coming out of the common optical fiber 1.

Claims (3)

1. Splitter splitter, consisting of a common fiber and an even number of branches, characterized in that, in order to reduce losses, the end portion of the total the fiber is made in the form of faces that are inclined to the axis of the common light. water angle V h --arcsin arcsin NA one P. and each of the branched light guides is installed to the corresponding face of the common fiber with a gap of at least 3 The seam is half the maximum length of a branched radiation, this angle V between the axes of the beam and the common optical fibers is equal to V -L. - - - arc8in (- cos 3c /) + By arcs81p (-O) By e Pr - the refractive index of the medium in the gap; the refractive index of the core of the common fiber; the refractive index of the core of the branched fiber; pp, 0 five NA - total number aperture light guide; i) is the angle of inclination perpendicular to the end surface of the branched light guide to its axis. Splitter pop.1, cast 0 2 due to the fact that, in order to simplify the production technology, the angle between the edges of the end part of the common fiber and its axis is 27-33 °, and the end surfaces of the branched fibers are perpendicular to their axis, 3. Splitter according to claims 1 and 2, which is characterized by the fact that at least one of the branched light guides is made with a chamfer at the end. / FIG. 2 FIG. J FIG. Compiled by V.Lavrov Editor A.Vorovich Tehred M.HodaNich Order 3828/41 Circulation 521 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Corrector S.Cherni