Parallel mode converter and optical divider composed by the same
A technology of mode conversion and optical splitter, applied in the direction of light guide, optics, instrument, etc., to achieve the effect of reducing additional loss
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[0031] we use image 3 Explain the waveguide structure formed by deep and shallow two-step etching, image 3 It is a schematic diagram of the mode conversion structure between different ridge waveguides formed for deep etching and shallow etching. In the figure: the starting silicon plate 24 starts from the SOI wafer; the shallow etching is performed on it to form the ridge waveguide 22, which is The width of the waveguide ridge is wide in the front and narrow in the back; after the shallow etching, there are high-level slab areas 25 on both sides of the waveguide ridge; deep etching forms a deeply etched ridge waveguide 23 connected to the back of the shallow etched ridge waveguide 22, and at the same time limits the shallow etched ridge waveguide The lateral dimension of the high-level slab area on both sides of 22, this limited high-level slab area is referred to as the shoulder 21 here; the shoulder 21 and the deep-etched ridge waveguide 23 are on both sides of the low-level...
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