SU1206985A1 - Waveguide plate for optical integrated circuit - Google Patents

Description

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The invention is intended for optical integrated circuits with a complex waveguide path used in optoelectronic processing, distribution and information transfer systems.

The purpose of the invention is to expand the range of possible angles of intersection of the strip guide plates, reduce the optical power loss and crosstalk in the neighboring arms and increase the number of intersecting strip guide elements.

Fig. 1 shows schematically a waveguide board for an optical integrated circuit; Fig. 2 is a schematic cross section of a strip optical waveguide.

Waveguide fee dl. The optical integrated circuit consists of di-. an electric substrate 1 with a refractive index ho, a planar waveguide layer 2 with a refractive index n and a set of strip guide elements 3 with a refractive index Pg. (. Q - i /) with intersecting axes. By placing on the surface of the planar waveguide layer 2 of the strip guide element 3 in the waveguide layer 2, a strip optical waveguide is formed under the guide strip element 3. In the area of intersection of the strip waveguides, the strip guide elements 3 are made with a gap of length L, which does not exceed the value Lj (j) 1 (W / 2) 2; i, where W is the width of the strip guide element, (is the radiation wavelength in vacuum, while the distance between the nearest borders of the strip guide elements is much larger than the dimensions of the localization region of the electric fields of the strip waveguide modes outside the strip guide element 3 and which is usually much larger than the wavelength j,

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The device works as follows.

Optical radiation enters through one of the 5 strip optic waveguides, diffracts onto the secondary strip guide element 3, at the rupture section of the strip guide element 3 the radiation propagates along the planar waveguide layer 2 without lateral limitation and then with almost no power loss enters strip waveguide in the direction of its initial propagation.

15 Similarly, and independently of each other, each strip waveguide operates. So. as the strip guide elements 3 are not optically coupled to one another and

20 there is no penetration of the electric field of the modes of the strip waveguides into the adjacent strip waveguides, and the discontinuity length U does not exceed the value LO,. optical radiation on

25, the discontinuity section of the strip guide element 3 propagates in the planar waveguide layer 2 almost straightforwardly, and the diffraction distortion of the original distribution 30 of the research institute of the electric field of the strip waveguide mode is negligible.

Due to the lack of optical communication between the strip guide elements and the fact that the radiation in the rupture section of the guide strip element within its length U extends in the planar waveguide layer almost linearly and without distorting the initial distribution of the strip waveguide electric field, expanding the range of possible angles of intersection of strip guides (strip waveguides), reducing optical power losses and crosstalk in adjacent arms, e is also provided to increase the number of intersecting stripline waveguides.

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Branch ShSh Patent, Uzhgorod, Proektna St., 4

Claims (1)

WAVEGUIDE BOARD FOR OPTICAL INTEGRAL CIRCUIT, containing strip guides on the dielectric substrate: elements with intersecting axes, with the exception of the fact that, in order to expand the range of possible intersection angles of strip guide elements, to reduce losses optical power and crosstalk in adjacent shoulders and an increase in the number of intersecting strip guide elements, a planar waveguide layer is introduced between the dielectric substrate and the strip guide elements with refractive index, and ₍ , in this case П _г г ti „£ П"., where п „and п _г are the refractive indices of the substrate and guide elements, respectively, and in the intersection region the guide elements are made with a gap of length U not exceeding about ig where V / is the width of the guide element; λ is the radiation wavelength in vacuum o