Compact cross-slot waveguide polarization beam splitter using a sandwich-type coupler

Wu Shengbao; Zhao Zhicheng; Feng Ting; Yao X. Steve

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Compact cross-slot waveguide polarization beam splitter using a sandwich-type coupler

机译：使用夹层式耦合器的紧凑型交叉槽波导偏振分束器

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A compact silicon-based cross-slot waveguide (CSW) polarization beam splitter (PBS) utilizing a sandwich-type coupler is proposed. The coupler consists of two identical CSWs separated by a horizontal slot waveguide (HSW), and S-bend sections at each end of the coupling section are introduced to decouple and separate the light. Owing to the strong birefringence of theHSW, the coupling length ratio between two different polarized modes (TE and TM) is adjustable in a suitable range by simply changing the gap width between the CSW and the HSW. The coupling length of the TM mode can be easily made half of that of the TE mode with a proper gap width, which is a favorable condition to realize a short PBS. Then, by making the length of the coupling section equal to the coupling length of the TE mode, the TE and TM modes are split. The PBS has the advantages of a small footprint and a high polarization extinction ratio (PER) and may be useful in the polarization management of a CSW-based on-chip optical system. Numerical results indicate that a PBS of similar to 12 mu m with an insertion loss (IL) of 0.17 (0.53) dB, PER of 24.12 (21.14) dB for the TM (TE) mode is achieved at the wavelength of 1.55 mu m, with a bandwidth covering the full C band for keeping PER > 15 dB and IL < 1 dB. (C) 2020 Optical Society of America.

机译：提出了一种利用夹层式耦合器的紧凑型硅基交叉槽波导（CSW）偏振分束器（PBS）。耦合器由两个相同的CSW，由水平槽波导（HSW）分开，并且引入耦合部分的每个端部的S弯曲部分以分离并分开光。由于ASW的强双折射，通过简单地改变CSW和HSW之间的间隙宽度，在合适的范围内可在合适的范围内调节两种不同偏振模式（TE和TM之间的耦合长度比。 TM模式的耦合长度可以容易地使TE模式的一半具有适当的间隙宽度，这是实现短PBS的有利条件。然后，通过使等于TE模式的耦合长度的耦合部分的长度，TE和TM模式被分开。 PBS具有小的占地面积和高偏振消光比（PER）的优点，并且可以在基于CSW的上芯片光学系统的偏振管理中有用。数值结果表明，在1.55μm的波长下，实现了与0.17（0.53）DB的插入损失（IL）的相似达12μm的PBS，例如24.12（21.14）DB，带宽覆盖全C频带，用于保持每个> 15 dB和IL <1 dB。（c）2020美国光学学会。

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来源
《Applied optics》 |2020年第5期|共7页
作者
Wu Shengbao; Zhao Zhicheng; Feng Ting; Yao X. Steve;
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Hebei Univ Coll Phys Sci &

Technol Hebei Key Lab Optelect Informat &

Mat Baoding 071002 Peoples R China;

Hebei Univ Coll Phys Sci &

Technol Hebei Key Lab Optelect Informat &

Mat Baoding 071002 Peoples R China;

Hebei Univ Coll Phys Sci &

Technol Hebei Key Lab Optelect Informat &

Mat Baoding 071002 Peoples R China;

Hebei Univ Coll Phys Sci &

Technol Hebei Key Lab Optelect Informat &

Mat Baoding 071002 Peoples R China;

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Compact cross-slot waveguide polarization beam splitter using a sandwich-type coupler

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