A kind of multimode waveguide and its design method

Abstract

The invention relates to a multimode waveguide and a design method thereof. The multimode waveguide includes a waveguide core layer and a cover layer. The waveguide core layer is formed by connecting D segment arcs, D≥3, and the adjacent arcs are at the connection point There is a common tangent line, the radius of curvature of the arc generally shows a trend of decreasing irregularly and abruptly from the initial section to the final section, and the transmission loss of any mode supported by the multimode waveguide is not higher than 5%, and the crosstalk between any two modes is not higher than ‑20dB. The multimode waveguide of the present invention can greatly reduce the loss of the multimode waveguide, greatly reduce the radius of curvature of the waveguide, reduce crosstalk between modes, and fundamentally break the use of established mathematical curves whose curvature radius variation range is relatively fixed, and the degree of variation is difficult to greatly adjust Shortcomings.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a multimode waveguide and a design method thereof. Background technique [0002] Recently, with the explosive growth of network information, the original network has become increasingly difficult to meet today's needs. Traditional integrated circuits have disadvantages such as low bandwidth and large transmission power consumption. Compared with electrons, using photons as carriers has great advantages. The transmission of optical information has greater bandwidth and lower transmission power consumption. [0003] Optical communication technology has developed rapidly over the decades, supporting our increasingly information-based society and economy. With the development of today's information, there is a rapidly expanding requirement for the expansion of the information capacity of a single optical fiber. Mode multiplexing (MDM) has different modes in the same wavelengt...

AI Technical Summary

Problems solved by technology

The two research groups listed above both use a specific existing mathematical function to design curved waveguides with gradual curvature changes, which have relatively large restrictions on the change of the curvature radius. Although the partial loss of the curved waveguide can be reduced to a certain extent, the degree of lower

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