Mode-evolution-based ultra-broadband polarization beam splitter using adiabatically tapered extreme skin-depth waveguide
Mode-evolution-based ultra-broadband polarization beam splitter using adiabatically tapered extreme skin-depth waveguide
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DOI：
10.1364/ol.434110
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发表时间：
2021-09-15
期刊：
影响因子：
3.6
通讯作者：
Kim, Sangsik
中科院分区：
文献类型：
--
作者：
Mia, Md Borhan;Ahmed, Syed Z.;Kim, Sangsik
提出了一种基于渐变型极端趋肤深度波导的超宽带硅光子偏振分束器。高各向异性超材料包层的eskid波导抑制横向电（TE）模式的串扰，而大的双折射eskid波导有效地交叉耦合横向磁（TM）模式。两个阶梯波导通过模式演化实现TM模到耦合端口的平滑转换，同时保持TE模在直通端口。数值设计了梯形光子带隙的锥形截面，在1400-1650 nm范围内获得了消光比>20 dB的大带宽。我们实验证明了锥形的eskid PBS，并确认其在1490-1640 nm的宽带宽，受激光带宽的限制。随着其模式的演变，锥形的eskid PBS是宽容的制造缺陷，应该是至关重要的控制在光子电路中的偏振。(C)2021美国光学学会
We present an ultra-broadband silicon photonic polarization beam splitter (PBS) using adiabatically tapered extreme skin-depth (eskid) waveguides. Highly anisotropic metamaterial claddings of the eskid waveguides suppress the crosstalk of transverse-electric (TE) mode, while the large birefringence of the eskid waveguide efficiently cross-couples the transverse-magnetic (TM) mode. Two eskid waveguides are adiabatically tapered to smoothly translate TM mode to the coupled port via mode evolution while keeping theTEmode in the through port. The tapered cross-section of the eskidPBSwas designed numerically, achieving a large bandwidth at 1400-1650 nm with extinction ratios >20 dB. We experimentally demonstrated the tapered-eskid PBS and confirmed its broad bandwidth at 1490-1640 nm, limited by laser bandwidth. With its mode evolution, the tapered-eskid PBS is tolerant to fabrication imperfections and should be crucial for controlling polarizations in photonic circuits. (C) 2021 Optical Society of America