Super-short vertical waveguide coupler with high manufacture tolerance

Abstract

The invention discloses a super-short vertical waveguide coupler with a high manufacture tolerance. The coupler is composed of an upper waveguide, a spacing layer and a lower waveguide in the vertical direction. In the spreading direction, the vertical coupler is divided into an input area, a coupling area and an output area. In the coupling area, the width of the upper waveguide decreases gradually, and the upper waveguide is divided into front, middle and rear segments; and in the front and rear segments, the width of the upper waveguide are contracted rapidly, and the middle segment is a mode transfer segment. The thickness of the spacing layer between the upper and lower waveguides is reduced to increase a coupling coefficient, and the length of the coupler is reduced; and in the middle segment of the coupling area, a proper upper waveguide width successively-decrease rate and a proper length are set, so that when the width of the upper waveguide deviates due to limitation of the practical manufacture precision, the mode of the upper waveguide can be still transferred to that of the lower waveguide, and the high manufacture tolerance is realized.

Description

technical field [0001] The invention relates to an optical component, in particular to a vertical waveguide coupler. Background technique [0002] As optical communication systems are upgraded to higher speeds, more and more optical devices are integrated into photonic integrated circuits (PICs) to achieve monolithic integration of various functions. In order to make optical communication devices develop in the direction of smaller size, lower power consumption, and more reliable stability, the integration of active and passive devices will be essential. At present, photonic integration technologies mainly include: Butt-joint regrowth technology, offset quantum well technology, quantum well hybrid technology, etc. The relatively complex manufacturing process of these integrated technologies leads to relatively high manufacturing costs and low yields. In addition, since the structures of active and passive devices cannot be designed separately, the performance of integrated ...

AI Technical Summary

Problems solved by technology

This coupler not only reduces the density of integrated devices, but also increases the insertion loss of the coupler, which greatly limits its practical application

In short, the current vertical coupler has the problem of small manufacturing tolerance or too long length, resulting in low yield of integrated devices and high manufacturing cost, making it unable to be widely used

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