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首页> 外文会议>Physics and simulation of optoelectronic devices XXIII >Compact polarization beam splitter for silicon-based slot waveguides based on an asymmetrical multimode interference coupler
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Compact polarization beam splitter for silicon-based slot waveguides based on an asymmetrical multimode interference coupler

机译：基于非对称多模干涉耦合器的硅基缝隙波导紧凑型偏振分束器

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A compact polarization beam splitter (PBS) for silicon-based slot waveguides is proposed based on a multimode interference coupler, where an asymmetrical multimode waveguide (AMW), cut by a right angle at one corner, is employed to efficiently separate the TE and TM modes. With the unique modal properties of the slot waveguides and corresponding optimized designs, the input TE mode can almost pass through the AMW and then enter into the bar port, while a mirror image is formed at the cross port for the input TM mode due to the self-imaging effect. Meanwhile, tapered waveguide structures and S-bend are incorporated into the designed PBS for further enhancing the performance. According to the numerical results, a PBS with an AMW of 2.3 μm in length is achieved, where the extinction ratios are 16.6 and 20.9 dB, respectively, for TE and TM modes, and the insertion losses are 1.37 and 0.81 dB, respectively, at the wavelength of 1.55 μm. For keeping extinction ratios over 15 and 20 dB for TE and TM modes, the bandwidths are around 59 and 73 nm, respectively, both covering the entire C-band. In addition, field evolution along the propagation distance through the PBS is also demonstrated.
机译：基于多模干涉耦合器，提出了一种用于硅基缝隙波导的紧凑型偏振分束器（PBS），其中采用在一个角上切成直角的不对称多模波导（AMW）有效分离TE和TM模式。利用缝隙波导的独特模态特性和相应的优化设计，输入TE模式几乎可以通过AMW，然后进入条形端口，而由于输入TM模式，在交叉端口上形成了镜像。自成像效果。同时，将锥形波导结构和S形弯曲并入设计的PBS中，以进一步提高性能。根据数值结果，获得了一个AMW为2.3μm的PBS，在TE和TM模式下，消光比分别为16.6和20.9 dB，在20°C时的插入损耗分别为1.37和0.81 dB。波长为1.55μm。为了使TE和TM模式的消光比保持在15和20 dB以上，带宽分别约为59和73 nm，都覆盖了整个C波段。另外，还证明了沿着通过PBS的传播距离的场演化。

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