Compact and efficient spot-size converter and design method thereof
A design method and converter technology, applied in the field of silicon-based optoelectronic integrated chip manufacturing, can solve problems such as long structure length, and achieve the effects of improving optimization efficiency and efficient mode spot conversion
Active Publication Date: 2014-10-08
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to provide a compact high-efficiency pattern converter and its design method, which overcomes the shortcoming of the long length of the traditional linear tapered conversion structure
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[0018] Such as figure 1 The structure schematic diagram of the compact high-efficiency speckle converter of the present invention is shown.
[0019] The key of the present invention is to use a linear tapered transformation structure with length L to be divided into less segments at equal intervals, and then use step-by-step optimization instead of traditional genetic algorithm to optimize the width of each segment, and then optimize the width of each segment in less segments. On the basis of segment optimization, it is further divided into more segments and continues to optimize until a high conversion efficiency is obtained. Compared with the traditional genetic algorithm, the efficiency of this optimization method is greatly improved. The specific method is:
[0020] Divide the linear tapered transformation structure of length L into n sections with equal intervals, take n=10, L is the target length of the required pattern converter, take L=20 μm, and the width of n sectio...
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The invention provides a compact and efficient spot-size converter and a design method thereof. The method comprises the following steps of firstly, dividing a linear tapered transformation structure with the length L into fewer segments arranged at equal intervals; then, optimizing the width of each segment by a progressive optimization method instead of a traditional genetic algorithm; and dividing the fewer segments into more segments on the basis that the fewer segments are optimized, and continuing to optimize until high conversion efficiency is obtained, and therefore, compared with the traditional genetic algorithm, the optimization method greatly improves the efficiency. After the compact and efficient spot-size converter is used, under that condition that the traditional linear tapered transformation structure has the same conversion efficiency, the length of an existing converter is greatly reduced to 20 microns from 150 microns, so that the integration level of a chip is further improved.
Description
technical field [0001] The invention relates to the technical field of manufacturing silicon-based photoelectric integrated chips, in particular to a mold spot converter and a design method thereof. Background technique [0002] With the rapid development of global optical communication technology, more and more people pay attention to integrated chips for optical signal processing. Many micro-nano integrated devices, such as micro-ring filters, arrayed waveguide gratings, modulators, etc., have been realized on silicon-on-insulator (SOI). In order to effectively couple the optical signal in the communication link into the integrated chip, it is proposed to use a grating coupler to realize the coupling of the optical signal. [0003] But unfortunately, in order to match with single-mode fiber, the width of the grating waveguide needs to be very wide (generally around 12 μm), which will cause mode mismatch with the subsequent single-mode waveguide (typically 0.5 μm in width)...
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IPC IPC(8): G02B6/14
Inventor 张新亮邹静慧余宇
Owner HUAZHONG UNIV OF SCI & TECH